diff --git a/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ClippingPathStack.java b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ClippingPathStack.java
new file mode 100644
index 0000000..2b84b66
--- /dev/null
+++ b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ClippingPathStack.java
@@ -0,0 +1,54 @@
+package com.iqser.red.service.ocr.v1.server.model;
+
+import com.pdftron.pdf.Rect;
+import lombok.Data;
+import lombok.SneakyThrows;
+
+import java.awt.geom.Area;
+import java.awt.geom.GeneralPath;
+import java.awt.geom.Rectangle2D;
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+@Data
+public class ClippingPathStack {
+
+ private Deque stack = new ArrayDeque<>();
+
+ @SneakyThrows
+ public ClippingPathStack(Rect rectangle) {
+ stack.push(new Area(new Rectangle2D.Double(rectangle.getX1(), rectangle.getY1(), rectangle.getWidth(), rectangle.getHeight()).getBounds2D()));
+ }
+
+
+ @SneakyThrows
+ public void intersectClippingPath(GeneralPath path) {
+ getCurrentClippingPath().intersect(new Area(path));
+ }
+
+ public boolean almostIntersects(double x, double y, double width, double height) {
+ // Height or width are zero for straight lines, even though they are being rendered. Therefore, height or width must be at minimum >0.
+ double tolerance = 1e-3;
+ double x_with_tolerance = x > 0 ? x - tolerance : x + tolerance;
+ double y_with_tolerance = y > 0 ? y - tolerance : y + tolerance;
+ double width_with_tolerance = width + 2 * tolerance;
+ double height_with_tolerance = height + 2 * tolerance;
+ return getCurrentClippingPath().intersects(x_with_tolerance, y_with_tolerance, width_with_tolerance, height_with_tolerance);
+ }
+
+ public Area getCurrentClippingPath() {
+ return stack.peek();
+ }
+
+ public void enterNewGState() {
+ Area current = stack.peek();
+ Area cloned = new Area();
+ cloned.add(current);
+ stack.push(cloned);
+ }
+
+ public void leaveGState() {
+ stack.pop();
+ }
+
+}
\ No newline at end of file
diff --git a/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ElementFeatures.java b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ElementFeatures.java
new file mode 100644
index 0000000..322f226
--- /dev/null
+++ b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/model/ElementFeatures.java
@@ -0,0 +1,148 @@
+package com.iqser.red.service.ocr.v1.server.model;
+
+import com.pdftron.common.PDFNetException;
+import com.pdftron.pdf.Element;
+import com.pdftron.pdf.Rect;
+import lombok.*;
+import lombok.experimental.SuperBuilder;
+
+import java.awt.geom.Rectangle2D;
+
+@Data
+@SuperBuilder
+@NoArgsConstructor
+@AllArgsConstructor
+public abstract class ElementFeatures {
+ private int elementType;
+ private Rectangle2D boundingBox;
+
+ public boolean almostMatches(Element element) throws PDFNetException {
+ if (element.getType() != elementType) return false;
+ if (element.getBBox() == null) return false;
+ return rectsAlmostMatch(element.getBBox());
+ }
+
+ protected boolean almostEqual(double a, double b) {
+ double tolerance = 1e-3;
+ return Math.abs(a - b) < tolerance;
+ }
+
+ @SneakyThrows
+ private boolean rectsAlmostMatch(Rect bBox) {
+ if (!almostEqual(bBox.getX1(), boundingBox.getX())) return false;
+ if (!almostEqual(bBox.getY1(), boundingBox.getY())) return false;
+ if (!almostEqual(bBox.getWidth(), boundingBox.getWidth())) return false;
+ return almostEqual(bBox.getHeight(), boundingBox.getHeight());
+ }
+
+ @EqualsAndHashCode(callSuper = true)
+ @Data
+ @SuperBuilder
+ @NoArgsConstructor
+ @AllArgsConstructor
+ public static class Text extends ElementFeatures {
+ private String text;
+ private int font;
+ private double fontsize;
+
+ @Override
+ public boolean almostMatches(Element element) throws PDFNetException {
+ if (!super.almostMatches(element)) return false;
+ if (!text.equals(element.getTextString())) return false;
+ if (font != element.getGState().getFont().getType()) return false;
+ return almostEqual(fontsize, element.getGState().getFontSize());
+ }
+
+ }
+
+ @EqualsAndHashCode(callSuper = true)
+ @Data
+ @SuperBuilder
+ @NoArgsConstructor
+ @AllArgsConstructor
+ public static class Path extends ElementFeatures {
+ private boolean isClippingPath;
+ private boolean isClipWindingFill;
+ private boolean isStroked;
+ private boolean isFilled;
+ private boolean isWindingFill;
+
+ @Override
+ public boolean almostMatches(Element element) throws PDFNetException {
+ if (!super.almostMatches(element)) return false;
+ if (isClippingPath != element.isClippingPath()) return false;
+ if (isClipWindingFill != element.isClipWindingFill()) return false;
+ if (isStroked != element.isStroked()) return false;
+ if (isFilled != element.isFilled()) return false;
+ if (isWindingFill != element.isWindingFill()) return false;
+
+ return true;
+ }
+ }
+
+ @EqualsAndHashCode(callSuper = true)
+ @Data
+ @SuperBuilder
+ @NoArgsConstructor
+ public static class Image extends ElementFeatures {
+ private int dataSize;
+ private int height;
+ private int width;
+ private int renderingIntent;
+ private int componentNum;
+ private int bitsPerComponent;
+
+ @Override
+ public boolean almostMatches(Element element) throws PDFNetException {
+ if (!super.almostMatches(element)) return false;
+ if (dataSize != element.getImageDataSize()) return false;
+ if (height != element.getImageHeight()) return false;
+ if (width != element.getImageWidth()) return false;
+ if (renderingIntent != element.getImageRenderingIntent()) return false;
+ if (componentNum != element.getComponentNum()) return false;
+ if (bitsPerComponent != element.getBitsPerComponent()) return false;
+ return true;
+ }
+ }
+
+ public static ElementFeatures extractFeatures(Element element) throws PDFNetException {
+ switch (element.getType()) {
+ case Element.e_path:
+ return ElementFeatures.Path.builder()
+ .elementType(element.getType())
+ .boundingBox(toRectangle2D(element.getBBox()))
+ .isClippingPath(element.isClippingPath())
+ .isClipWindingFill(element.isClipWindingFill())
+ .isStroked(element.isStroked())
+ .isFilled(element.isFilled())
+ .isWindingFill(element.isWindingFill())
+ .build();
+ case Element.e_text:
+ return ElementFeatures.Text.builder()
+ .elementType(element.getType())
+ .boundingBox(toRectangle2D(element.getBBox()))
+ .text(element.getTextString())
+ .font(element.getGState().getFont().getType())
+ .fontsize(element.getGState().getFontSize())
+ .build();
+ case Element.e_image:
+ case Element.e_inline_image:
+ return Image.builder()
+ .elementType(element.getType())
+ .boundingBox(toRectangle2D(element.getBBox()))
+ .dataSize(element.getImageDataSize())
+ .height(element.getImageHeight())
+ .width(element.getImageWidth())
+ .renderingIntent(element.getImageRenderingIntent())
+ .componentNum(element.getComponentNum())
+ .bitsPerComponent(element.getBitsPerComponent())
+ .build();
+ default:
+ throw new UnsupportedOperationException("Feature Extraction is not supported for PDFTron.Element with type: " + element.getType());
+ }
+ }
+
+ private static Rectangle2D toRectangle2D(Rect rect) throws PDFNetException {
+ return new Rectangle2D.Double(rect.getX1(), rect.getY1(), rect.getWidth(), rect.getHeight());
+ }
+}
diff --git a/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/InvisibleElementService.java b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/InvisibleElementService.java
new file mode 100644
index 0000000..14d0be0
--- /dev/null
+++ b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/InvisibleElementService.java
@@ -0,0 +1,448 @@
+package com.iqser.red.service.ocr.v1.server.service;
+
+import com.iqser.red.service.ocr.v1.server.model.ClippingPathStack;
+import com.iqser.red.service.ocr.v1.server.model.ElementFeatures;
+import com.pdftron.common.Matrix2D;
+import com.pdftron.common.PDFNetException;
+import com.pdftron.pdf.*;
+import com.pdftron.sdf.Obj;
+import com.pdftron.sdf.SDFDoc;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.GeneralPath;
+import java.awt.geom.Rectangle2D;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.stream.Collectors;
+
+@Slf4j
+@Service
+public class InvisibleElementService {
+
+ /*
+ handled cases:
+ Text which is transparent or is set to not render
+ Text or Path or Images outside of clipping path
+ Text or Path or Images that have been painted over by visible and filled Paths
+ unhandled cases:
+ Text covered by widely stroked path
+ Text same color as background
+ Any Text set to clipping with its many interactions with other elements
+ */
+ @SneakyThrows
+ public byte[] removeInvisibleElements(byte[] pdfFile, boolean delta) {
+ PDFDoc pdfDoc = new PDFDoc(pdfFile);
+
+ ElementWriter writer = new ElementWriter();
+ ElementReader reader = new ElementReader();
+ Set visited = new TreeSet<>();
+
+ for (PageIterator iterator = pdfDoc.getPageIterator(); iterator.hasNext(); ) {
+ Page page = iterator.next();
+ List overlappedElements = removeClippedElementsAndInvisibleTextAndRememberOverlappedElements(page, reader, writer, visited, delta);
+ visited.clear();
+ removeOverlappedElements(page, reader, writer, visited, overlappedElements, delta);
+ }
+
+ return pdfDoc.save(SDFDoc.SaveMode.REMOVE_UNUSED, null);
+ }
+
+
+ private List removeClippedElementsAndInvisibleTextAndRememberOverlappedElements(Page page, ElementReader reader, ElementWriter writer, Set visited, boolean delta)
+ throws PDFNetException {
+ var overlappedElements = new ArrayList();
+ var visibleElements = new ArrayList();
+ ClippingPathStack clippingPathStack = new ClippingPathStack(page.getMediaBox());
+ visited.add((int) page.getSDFObj().getObjNum());
+ reader.begin(page);
+ writer.begin(page, ElementWriter.e_replacement, false, true, page.getResourceDict());
+ processElements(reader, writer, visited, clippingPathStack, delta, overlappedElements, visibleElements);
+ writer.end();
+ reader.end();
+ return overlappedElements;
+ }
+
+ private void processElements(ElementReader reader, ElementWriter writer, Set visited, ClippingPathStack clippingPathStack, Boolean delta,
+ List coveredElements, List visibleElements)
+ throws PDFNetException {
+
+ for (Element element = reader.next(); element != null; element = reader.next())
+ switch (element.getType()) {
+
+ case Element.e_image:
+ case Element.e_inline_image:
+ processImages(element, writer, clippingPathStack, delta, visibleElements);
+ break;
+
+ case Element.e_text:
+ processText(element, writer, clippingPathStack, delta, visibleElements);
+ break;
+
+ case Element.e_path:
+ processPath(element, writer, clippingPathStack, delta, coveredElements, visibleElements);
+ break;
+
+ case Element.e_form:
+ processForm(reader, writer, element, visited, clippingPathStack, delta, coveredElements, visibleElements);
+ break;
+
+ case Element.e_group_begin:
+ clippingPathStack.enterNewGState();
+ writer.writeElement(element);
+ break;
+
+ case Element.e_group_end:
+ clippingPathStack.leaveGState();
+ writer.writeElement(element);
+ break;
+
+ default:
+ writer.writeElement(element);
+ }
+ }
+
+ private void processImages(Element imageElement, ElementWriter writer, ClippingPathStack clippingPathStack, Boolean delta, List visibleElements)
+ throws PDFNetException {
+
+ Rect rect = imageElement.getBBox();
+
+ if (rect == null) {
+ return;
+ }
+
+ boolean inClippingPath = clippingPathStack.almostIntersects(rect.getX1(), rect.getY1(), rect.getWidth(), rect.getHeight());
+
+ if (!delta && inClippingPath) {
+ visibleElements.add(ElementFeatures.extractFeatures(imageElement));
+ writer.writeElement(imageElement);
+ }
+
+ if (delta && !inClippingPath) {
+ writer.writeElement(imageElement);
+ }
+ }
+
+ private void processText(Element textElement, ElementWriter writer, ClippingPathStack clippingPathStack,
+ Boolean delta, List visibleElements)
+ throws PDFNetException {
+
+ Rect rect = textElement.getBBox();
+
+ if (rect == null) {
+ writer.writeElement(textElement);
+ return;
+ }
+
+ GState gState = textElement.getGState();
+
+ boolean inClippingPath = clippingPathStack.almostIntersects(rect.getX1(), rect.getY1(), rect.getWidth(), rect.getHeight());
+
+ boolean isTextVisible = isTextRenderedVisibly(gState);
+
+ if (inClippingPath && isTextVisible) {
+ visibleElements.add(ElementFeatures.extractFeatures(textElement));
+ }
+ if (!delta) {
+ if (inClippingPath && isTextVisible) {
+ writer.writeElement(textElement);
+ } else if (textElement.hasTextMatrix()) {
+ /*
+ PDFTron Element with type "text" refers to a Tj command. If a Tm command is just above it in the pdf file, PDFTron will join the two commands and treat them as one Element.
+ hasTextMatrix() checks for this case specifically. Also, Tm changes the position for a whole BT/ET segment, possibly containing multiple Tj commands.
+ Therefore, the position of a following Tj is affected by not writing the first Element.
+ This is why, we write only the Tm command:
+ */
+ writer.writeGStateChanges(textElement);
+ }
+ } else {
+ if (!inClippingPath) {
+ gState.setFillColorSpace(ColorSpace.createDeviceRGB());
+ gState.setFillColor(new ColorPt(1, 0, 0));
+ writer.writeElement(textElement);
+ }
+ if (!isTextVisible) {
+ gState.setFillColorSpace(ColorSpace.createDeviceRGB());
+ gState.setFillColor(new ColorPt(0, 0, 1));
+ gState.setTextRenderMode(GState.e_fill_text);
+ gState.setFillOpacity(1);
+ writer.writeElement(textElement);
+ }
+ }
+ }
+
+ private void processForm(ElementReader reader, ElementWriter writer, Element element, Set visited, ClippingPathStack clippingPathStack, Boolean delta,
+ List coveredElements, List allElements)
+ throws PDFNetException {
+
+ writer.writeElement(element);
+ Obj formObj = element.getXObject();
+
+ if (!visited.contains((int) formObj.getObjNum())) {
+ visited.add((int) formObj.getObjNum());
+ ElementWriter new_writer = new ElementWriter();
+ reader.formBegin();
+ new_writer.begin(formObj);
+
+ reader.clearChangeList();
+ new_writer.setDefaultGState(reader);
+
+ processElements(reader, new_writer, visited, clippingPathStack, delta, coveredElements, allElements);
+ new_writer.end();
+ reader.end();
+ }
+ }
+
+ private void processPath(Element pathElement, ElementWriter writer, ClippingPathStack clippingPathStack, Boolean delta,
+ List overlappedElements, List visibleElements)
+ throws PDFNetException {
+
+ GeneralPath linePath = convertToGeneralPath(pathElement.getPathData());
+
+ //transform path to initial user space
+ var ctm = pathElement.getCTM();
+ var affineTransform = getAffineTransform(ctm);
+ linePath.transform(affineTransform);
+
+ var rect = linePath.getBounds2D();
+
+ boolean inClippingPath = clippingPathStack.almostIntersects(rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight());
+
+ if (pathElement.isClippingPath()) {
+ if (pathElement.isClipWindingFill()) {
+ linePath.setWindingRule(GeneralPath.WIND_NON_ZERO);
+ } else {
+ linePath.setWindingRule(GeneralPath.WIND_EVEN_ODD);
+ }
+
+ clippingPathStack.intersectClippingPath(linePath);
+ pathElement.setPathClip(!delta);
+ writer.writeElement(pathElement);
+
+ } else {
+ if (inClippingPath) {
+ if (isFilledAndNonTransparent(pathElement)) {
+ List currentOverlappedElements = visibleElements.stream()
+ .filter(features -> almostContains(linePath, features.getBoundingBox()))
+ .collect(Collectors.toList());
+ overlappedElements.addAll(currentOverlappedElements);
+ visibleElements.removeAll(currentOverlappedElements);
+ }
+ visibleElements.add(ElementFeatures.extractFeatures(pathElement));
+ if (!delta) {
+ writer.writeElement(pathElement);
+ }
+ }
+ if (delta && !inClippingPath) {
+ pathElement.getGState().setFillColorSpace(ColorSpace.createDeviceRGB());
+ pathElement.getGState().setFillColor(new ColorPt(1, 0, 0));
+ pathElement.getGState().setStrokeColorSpace(ColorSpace.createDeviceRGB());
+ pathElement.getGState().setStrokeColor(new ColorPt(1, 0, 0));
+ writer.writeElement(pathElement);
+ }
+ }
+ }
+
+ private static AffineTransform getAffineTransform(Matrix2D ctm) throws PDFNetException {
+ return new AffineTransform(ctm.getA(), ctm.getB(), ctm.getC(), ctm.getD(), ctm.getH(), ctm.getV());
+ }
+
+ private void removeOverlappedElements(Page page, ElementReader reader, ElementWriter writer, Set visited, List overlappedElements, boolean delta)
+ throws PDFNetException {
+ reader.begin(page);
+ writer.begin(page, ElementWriter.e_replacement, false, true, page.getResourceDict());
+ if (delta) {
+ overlappedElements.forEach(feature -> drawBBox(writer, feature.getBoundingBox(), "#00FF00"));
+ overlappedElements.clear();
+ }
+ processOverlappedElements(reader, writer, visited, overlappedElements, delta);
+ writer.end();
+ reader.end();
+
+ if (overlappedElements.size() > 0) {
+ log.warn(overlappedElements.size() + " overlapped elements have not been found and removed");
+ }
+ }
+
+ private void processOverlappedElements(ElementReader reader, ElementWriter writer, Set visited, List coveredElements, boolean delta)
+ throws PDFNetException {
+ for (Element element = reader.next(); element != null; element = reader.next()) {
+ switch (element.getType()) {
+ case Element.e_form:
+ processFormOverlappedElements(reader, writer, element, visited, coveredElements, delta);
+ break;
+ case Element.e_path:
+ case Element.e_image:
+ case Element.e_inline_image:
+ case Element.e_text:
+ boolean anyMatch = false;
+ for (ElementFeatures elementToRemove : coveredElements) {
+ if (elementToRemove.almostMatches(element)) {
+ coveredElements.remove(elementToRemove);
+ anyMatch = true;
+ break;
+ }
+ }
+ if (!anyMatch) {
+ writer.writeElement(element);
+ } else if (element.getType() == 3 && element.hasTextMatrix()) {
+ /*
+ PDFTron Element with type "text" refers to a Tj command. If a Tm command is just above it in the pdf file, PDFTron will join the two commands and treat them as one Element.
+ hasTextMatrix() checks for this case specifically. Also, Tm changes the position for a whole BT/ET segment, possibly containing multiple Tj commands.
+ Therefore, the position of a following Tj is affected by not writing the first Element.
+ This is why, we write only the Tm command:
+ */
+ writer.writeGStateChanges(element);
+ }
+ break;
+
+ default:
+ writer.writeElement(element);
+
+ }
+ }
+ }
+
+ private void processFormOverlappedElements(ElementReader reader, ElementWriter writer, Element element, Set visited, List elementsToRemove, boolean delta)
+ throws PDFNetException {
+
+ writer.writeElement(element);
+ Obj formObj = element.getXObject();
+
+ if (!visited.contains((int) formObj.getObjNum())) {
+ visited.add((int) formObj.getObjNum());
+ ElementWriter new_writer = new ElementWriter();
+ reader.formBegin();
+ new_writer.begin(formObj);
+
+ reader.clearChangeList();
+ new_writer.setDefaultGState(reader);
+
+ processOverlappedElements(reader, new_writer, visited, elementsToRemove, delta);
+ new_writer.end();
+ reader.end();
+ }
+ }
+
+ private boolean isTextRenderedVisibly(GState gState) throws PDFNetException {
+ if (gState.getTextRenderMode() == GState.e_invisible_text) return false;
+ if (gState.getTextRenderMode() == GState.e_fill_text && gState.getFillOpacity() == 0) return false;
+ if (gState.getTextRenderMode() == GState.e_stroke_text && gState.getStrokeOpacity() == 0) return false;
+ if (gState.getTextRenderMode() == GState.e_fill_stroke_text && gState.getFillOpacity() == 0 && gState.getStrokeOpacity() == 0) return false;
+ return true;
+ }
+
+ private GeneralPath convertToGeneralPath(PathData pathData) throws PDFNetException {
+ GeneralPath linePath = new GeneralPath();
+
+ double[] dataPoints = pathData.getPoints();
+ byte[] opr = pathData.getOperators();
+
+ double x1;
+ double y1;
+ double x2;
+ double y2;
+ double x3;
+ double y3;
+
+ int data_index = 0;
+ for (int opr_index = 0; opr_index < opr.length; ++opr_index) {
+ switch (opr[opr_index]) {
+ case PathData.e_moveto:
+ x1 = dataPoints[data_index];
+ ++data_index;
+ y1 = dataPoints[data_index];
+ ++data_index;
+
+ linePath.moveTo(x1, y1);
+ break;
+ case PathData.e_lineto:
+ x1 = dataPoints[data_index];
+ ++data_index;
+ y1 = dataPoints[data_index];
+ ++data_index;
+
+ linePath.lineTo(x1, y1);
+ break;
+ case PathData.e_cubicto:
+ x1 = dataPoints[data_index];
+ ++data_index;
+ y1 = dataPoints[data_index];
+ ++data_index;
+ x2 = dataPoints[data_index];
+ ++data_index;
+ y2 = dataPoints[data_index];
+ ++data_index;
+ x3 = dataPoints[data_index];
+ ++data_index;
+ y3 = dataPoints[data_index];
+ ++data_index;
+
+ linePath.curveTo(x1, y1, x2, y2, x3, y3);
+ break;
+ case PathData.e_rect:
+ x1 = dataPoints[data_index];
+ ++data_index;
+ y1 = dataPoints[data_index];
+ ++data_index;
+ double w = dataPoints[data_index];
+ ++data_index;
+ double h = dataPoints[data_index];
+ ++data_index;
+ x2 = x1 + w;
+ y2 = y1;
+ x3 = x2;
+ y3 = y1 + h;
+ double x4 = x1;
+ double y4 = y3;
+
+ linePath.moveTo(x1, y1);
+ linePath.lineTo(x2, y2);
+ linePath.lineTo(x3, y3);
+ linePath.lineTo(x4, y4);
+ break;
+ case PathData.e_closepath:
+ linePath.closePath();
+ break;
+ default:
+ throw new PDFNetException("Invalid Element Type", 0, "", "", "");
+ }
+ }
+ return linePath;
+ }
+
+ private boolean almostContains(Shape outer, Rectangle2D inner) {
+ double tolerance = 1e-3;
+
+ double x_with_tolerance = inner.getX() >= 0 ? inner.getX() + tolerance : inner.getX() - tolerance;
+ double y_with_tolerance = inner.getY() >= 0 ? inner.getY() + tolerance : inner.getY() - tolerance;
+ double height_with_tolerance = inner.getHeight() - (2 * tolerance);
+ double width_with_tolerance = inner.getWidth() - (2 * tolerance);
+ Rectangle2D innerRect = new Rectangle2D.Double(x_with_tolerance, y_with_tolerance, width_with_tolerance, height_with_tolerance);
+
+ return outer.contains(innerRect);
+ }
+
+ private boolean isFilledAndNonTransparent(Element element) throws PDFNetException {
+ return element.isFilled() && element.getGState().getFillOpacity() == 1;
+ }
+
+
+ @SneakyThrows
+ private void drawBBox(ElementWriter writer, Rectangle2D r, String hexcolor) {
+ ColorPt colorPt = new ColorPt(Integer.valueOf(hexcolor.substring(1, 3), 16) / 255d,
+ Integer.valueOf(hexcolor.substring(3, 5), 16) / 255d,
+ Integer.valueOf(hexcolor.substring(5, 7), 16) / 255d);
+ ElementBuilder eb = new ElementBuilder();
+ Element rect = eb.createRect(r.getX(), r.getY(), r.getWidth(), r.getHeight());
+ rect.setPathStroke(true);
+ rect.getGState().setStrokeColorSpace(ColorSpace.createDeviceRGB());
+ rect.getGState().setStrokeColor(colorPt);
+ writer.writePlacedElement(rect);
+ }
+}
\ No newline at end of file
diff --git a/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/OCRService.java b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/OCRService.java
index 2a25bfa..a14d51a 100644
--- a/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/OCRService.java
+++ b/ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/OCRService.java
@@ -1,42 +1,26 @@
package com.iqser.red.service.ocr.v1.server.service;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import org.apache.commons.io.IOUtils;
-import org.springframework.amqp.rabbit.core.RabbitTemplate;
-import org.springframework.stereotype.Service;
-
import com.fasterxml.jackson.databind.ObjectMapper;
import com.iqser.red.service.ocr.v1.api.model.OCRStatusUpdateResponse;
import com.iqser.red.service.ocr.v1.server.configuration.MessagingConfiguration;
import com.iqser.red.service.ocr.v1.server.model.ImagePosition;
import com.iqser.red.service.ocr.v1.server.model.image.ImageServiceResponse;
import com.iqser.red.service.ocr.v1.server.settings.OcrServiceSettings;
-import com.iqser.red.service.persistence.service.v1.api.utils.SuppressFBWarnings;
import com.iqser.red.service.redaction.v1.model.Point;
import com.iqser.red.service.redaction.v1.model.Rectangle;
-import com.pdftron.common.PDFNetException;
-import com.pdftron.pdf.ContentReplacer;
-import com.pdftron.pdf.OCRModule;
-import com.pdftron.pdf.OCROptions;
-import com.pdftron.pdf.Optimizer;
-import com.pdftron.pdf.PDFDoc;
-import com.pdftron.pdf.Page;
-import com.pdftron.pdf.Rect;
-import com.pdftron.pdf.RectCollection;
-import com.pdftron.pdf.TextExtractor;
+import com.pdftron.pdf.*;
import com.pdftron.sdf.SDFDoc;
-
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.io.IOUtils;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.stereotype.Service;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.util.*;
@Slf4j
@Service
@@ -44,7 +28,6 @@ import lombok.extern.slf4j.Slf4j;
public class OCRService {
public static final String ENGLISH = "eng";
- public static final String REPLACEMENT_TEXT = "";
private final FileStorageService fileStorageService;
private final OcrServiceSettings settings;
@@ -53,6 +36,8 @@ public class OCRService {
private final ObjectMapper objectMapper;
+ private final InvisibleElementService invisibleElementService;
+
@SneakyThrows
public InputStream ocrDocument(String dossierId, String fileId) {
@@ -62,16 +47,16 @@ public class OCRService {
var fileBytes = IOUtils.toByteArray(fileStream);
- var ocrBytes = ocr(fileBytes, fileId, imageServiceResponse);
+ byte[] fileWithoutInvisibleTextBytes = invisibleElementService.removeInvisibleElements(fileBytes, false);
+
+ var ocrBytes = ocr(fileWithoutInvisibleTextBytes, fileId, imageServiceResponse);
return new ByteArrayInputStream(ocrBytes);
}
- @SuppressFBWarnings("REC_CATCH_EXCEPTION")
private byte[] ocr(byte[] file, String fileId, ImageServiceResponse imageServiceResponse) {
-
PDFDoc pdfDoc = null;
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
pdfDoc = new PDFDoc(file);
@@ -86,30 +71,11 @@ public class OCRService {
imageMetadata.getPosition().getPageNumber()), imageMetadata.isAlpha())));
Map pdfDocMap = Collections.synchronizedMap(new HashMap<>());
- Map wordCountPerPage = Collections.synchronizedMap(new HashMap<>());
rabbitTemplate.convertAndSend(MessagingConfiguration.OCR_STATUS_UPDATE_RESPONSE_QUEUE,
objectMapper.writeValueAsString(OCRStatusUpdateResponse.builder().fileId(fileId).numberOfPagesToOCR(pages.keySet().size()).build()));
- ocrPages(pdfDoc, fileId, pages, pdfDocMap, wordCountPerPage);
-
- for (var entry : pdfDocMap.entrySet()) {
-
- var ocrDoc = entry.getValue();
- var page = entry.getKey();
-
- Page ocrPage = ocrDoc.getPageIterator(1).next();
-
- TextExtractor txt = new TextExtractor();
- txt.begin(ocrPage);
- int wordCount = txt.getWordCount();
- if (wordCount >= wordCountPerPage.get(page)) {
- pdfDoc.pageInsert(pdfDoc.getPageIterator(page), ocrPage);
- pdfDoc.pageRemove(pdfDoc.getPageIterator(page + 1));
- }
-
- ocrDoc.close();
- }
+ ocrPages(pdfDoc, fileId, pages, pdfDocMap);
Optimizer.optimize(pdfDoc);
pdfDoc.save(out, SDFDoc.SaveMode.LINEARIZED, null);
@@ -139,7 +105,7 @@ public class OCRService {
@SneakyThrows
- private void ocrPages(PDFDoc pdfDoc, String fileId, Map> pages, Map pdfDocMap, Map wordCountPerPage) {
+ private void ocrPages(PDFDoc pdfDoc, String fileId, Map> pages, Map pdfDocMap) {
int numberOfOCRedPages = 0;
for (var pageEntry : pages.entrySet()) {
@@ -149,35 +115,20 @@ public class OCRService {
var page = pageEntry.getKey();
- var areasToRemoveInOcrDoc = new ArrayList();
-
Page pdfPage = pdfDoc.getPageIterator(page).next();
pdfPage.setMediaBox(pdfPage.getCropBox());
- TextExtractor txt = new TextExtractor();
- txt.begin(pdfPage);
- int wordCount = txt.getWordCount();
- wordCountPerPage.put(page, wordCount);
-
for (ImagePosition imagePosition : pageEntry.getValue()) {
Rectangle rectangle = imagePosition.getRectangle();
- Rect rect = convert(rectangle, pdfPage.getCropBox(), pdfPage.getMediaBox());
// Warning coordinate system is different in this call macOs/Linux
double y = -rectangle.getTopLeft().getY() + pdfPage.getCropBox().getY2() - rectangle.getHeight();
rectCollection.addRect(rectangle.getTopLeft().getX(), y, rectangle.getTopLeft().getX() + rectangle.getWidth(), y + rectangle.getHeight());
-
- if (!imagePosition.isHasTransparency()) {
- areasToRemoveInOcrDoc.add(rect);
- }
}
- rectCollection.clear();
-
PDFDoc ocrDoc = new PDFDoc();
ocrDoc.pagePushBack(pdfPage);
- removeTextFromOCRPage(areasToRemoveInOcrDoc, ocrDoc);
pdfDocMap.put(pageEntry.getKey(), ocrDoc);
OCROptions options = new OCROptions();
@@ -186,6 +137,8 @@ public class OCRService {
options.addDPI(settings.getOcrDPI());
OCRModule.processPDF(ocrDoc, options);
+ rectCollection.clear();
+
} catch (Exception e) {
log.warn("Failed to process PDF page {}", pageEntry.getKey());
}
@@ -201,39 +154,4 @@ public class OCRService {
}
}
-
-
- @SneakyThrows
- private void removeTextFromOCRPage(List areasToRemoveInOcrDoc, PDFDoc ocrDoc) {
-
- Page ocrPage = ocrDoc.getPage(1);
- for (var rect : areasToRemoveInOcrDoc) {
- try {
- ContentReplacer replacer = new ContentReplacer(); // Reinitialize is needed in loop.
- replacer.addText(rect, REPLACEMENT_TEXT);
- replacer.process(ocrPage);
- } catch (Exception e) {
- log.warn("Skipping removing text behind image because of: {}", e.getMessage());
- break;
- }
- }
- }
-
-
- public Rect convert(Rectangle rectangle, Rect cropBox, Rect mediaBox) {
-
- try {
- var offset = 0.01;
- var x1 = rectangle.getTopLeft().getX() + cropBox.getX1() - mediaBox.getX1() + (cropBox.equals(mediaBox) ? cropBox.getX1() : 0f) - offset;
- var y1 = rectangle.getTopLeft().getY() + rectangle.getHeight() - (mediaBox.getY1() - cropBox.getY1()) + (cropBox.equals(mediaBox) ? cropBox.getY1() : 0f) + offset;
- var x2 = rectangle.getTopLeft().getX() + rectangle.getWidth() + cropBox.getX1() - mediaBox.getX1() + (cropBox.equals(mediaBox) ? cropBox.getX1() : 0f) + offset;
- var y2 = rectangle.getTopLeft().getY() - (mediaBox.getY1() - cropBox.getY1()) + (cropBox.equals(mediaBox) ? cropBox.getY1() : 0f) - offset;
-
- // Rect is specified by lower-left and upperright corner.
- return new Rect(x1, y1, x2, y2);
- } catch (PDFNetException e) {
- throw new RuntimeException(e);
- }
- }
-
}
diff --git a/ocr-service-v1/ocr-service-server-v1/src/test/java/com/iqser/red/service/ocr/v1/server/InvisibleElementServiceTest.java b/ocr-service-v1/ocr-service-server-v1/src/test/java/com/iqser/red/service/ocr/v1/server/InvisibleElementServiceTest.java
new file mode 100644
index 0000000..d76f6b0
--- /dev/null
+++ b/ocr-service-v1/ocr-service-server-v1/src/test/java/com/iqser/red/service/ocr/v1/server/InvisibleElementServiceTest.java
@@ -0,0 +1,78 @@
+package com.iqser.red.service.ocr.v1.server;
+
+import com.iqser.red.service.ocr.v1.server.service.InvisibleElementService;
+import com.pdftron.pdf.PDFDoc;
+import com.pdftron.pdf.Page;
+import com.pdftron.pdf.PageIterator;
+import com.pdftron.pdf.TextExtractor;
+import lombok.SneakyThrows;
+import org.apache.commons.io.FileUtils;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.amqp.rabbit.core.RabbitTemplate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.annotation.Import;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import static com.iqser.red.service.ocr.v1.server.utils.OsUtils.getTemporaryDirectory;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@ExtendWith(SpringExtension.class)
+@SpringBootTest(classes = Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT //
+ , properties = {"pdftron.ocrmodule.path=/YourOCRModulePath"})
+@Import(OcrServiceIntegrationTest.TestConfiguration.class)
+public class InvisibleElementServiceTest {
+
+ @Autowired
+ private InvisibleElementService invisibleElementService;
+
+ @MockBean
+ protected RabbitTemplate rabbitTemplate;
+
+ @Test
+ @SneakyThrows
+ public void testRemoveInvisibleText() {
+ String fileName = "InvisibleText";
+
+ ClassPathResource pdfFileResource = new ClassPathResource("files/" + fileName + ".pdf");
+
+ var initialFileBytes = Files.readAllBytes(pdfFileResource.getFile().toPath());
+
+ var fileWithoutInvisibleText = invisibleElementService.removeInvisibleElements(initialFileBytes, false);
+ var deltaFile = invisibleElementService.removeInvisibleElements(initialFileBytes, true);
+
+ String fileWithoutInvisibleTextLocation = getTemporaryDirectory() + "/" + fileName + ".pdf";
+ String deltaFileLocation = getTemporaryDirectory() + "/" + fileName + "_delta.pdf";
+
+ saveToFile(fileWithoutInvisibleTextLocation, fileWithoutInvisibleText);
+ saveToFile(deltaFileLocation, deltaFile);
+
+ System.out.println("Output File without invisible elements: " + fileWithoutInvisibleTextLocation);
+ System.out.println("Output Delta File: " + deltaFileLocation);
+ TextExtractor extractor = new TextExtractor();
+ PDFDoc pdfDoc = new PDFDoc(fileWithoutInvisibleText);
+ PageIterator iterator = pdfDoc.getPageIterator();
+ while (iterator.hasNext()) {
+ Page page = iterator.next();
+ extractor.begin(page);
+ String[] text = extractor.getAsText().split("\n");
+ assertThat(text).containsAnyOf("APPENDIX 16 Pathology Report", "Amendment 1", "Page 255 of 260");
+ }
+ }
+
+ private void saveToFile(String location, byte[] fileBytes) {
+ try (var f_out = FileUtils.openOutputStream(new File(location))) {
+ f_out.write(fileBytes);
+ } catch (IOException e) {
+ throw new RuntimeException("File location: " + location + "could not be openend, no file will be saved");
+ }
+
+ }
+}
\ No newline at end of file
diff --git a/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.IMAGE_INFO.json b/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.IMAGE_INFO.json
new file mode 100644
index 0000000..940d444
--- /dev/null
+++ b/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.IMAGE_INFO.json
@@ -0,0 +1 @@
+{"dossierId": "c8553cbd-409f-4e1a-baf4-34b11d49deac", "fileId": "bd6f93ed896dd0e2f641b0568f13ddf1", "targetFileExtension": "ORIGIN.pdf.gz", "responseFileExtension": "IMAGE_INFO.json.gz", "data": [{"classification": {"label": "other", "probabilities": {"other": 0.9999, "logo": 0.0001, "formula": 0.0, "signature": 0.0}}, "representation": "FFFFFEFBF7EFCFFFFFFFFFFFF", "position": {"x1": -3, "x2": 795, "y1": 0, "y2": 612, "pageNumber": 1}, "geometry": {"width": 798, "height": 612}, "alpha": false, "filters": {"geometry": {"imageSize": {"quotient": 1.0038, "tooLarge": true, "tooSmall": false}, "imageFormat": {"quotient": 1.3039, "tooTall": false, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": false}}, {"classification": {"label": "logo", "probabilities": {"logo": 0.9966, "other": 0.0025, "signature": 0.0005, "formula": 0.0003}}, "representation": "FFC33D3C323CCF3390C1F8C72", "position": {"x1": 120, "x2": 131, "y1": 264, "y2": 380, "pageNumber": 1}, "geometry": {"width": 11, "height": 116}, "alpha": true, "filters": {"geometry": {"imageSize": {"quotient": 0.0513, "tooLarge": false, "tooSmall": false}, "imageFormat": {"quotient": 0.0948, "tooTall": true, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": false}}, {"classification": {"label": "other", "probabilities": {"other": 1.0, "formula": 0.0, "logo": 0.0, "signature": 0.0}}, "representation": "EF8FF6381060800318F0E187", "position": {"x1": 152, "x2": 205, "y1": 115, "y2": 533, "pageNumber": 1}, "geometry": {"width": 53, "height": 418}, "alpha": true, "filters": {"geometry": {"imageSize": {"quotient": 0.2138, "tooLarge": false, "tooSmall": false}, "imageFormat": {"quotient": 0.1268, "tooTall": false, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": true}}, {"classification": {"label": "other", "probabilities": {"other": 0.5967, "logo": 0.1756, "signature": 0.1218, "formula": 0.106}}, "representation": "EC9377C9170E1070C3070C30F", "position": {"x1": 196, "x2": 221, "y1": 121, "y2": 245, "pageNumber": 1}, "geometry": {"width": 25, "height": 124}, "alpha": true, "filters": {"geometry": {"imageSize": {"quotient": 0.08, "tooLarge": false, "tooSmall": false}, "imageFormat": {"quotient": 0.2016, "tooTall": false, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": true}}, {"classification": {"label": "logo", "probabilities": {"logo": 1.0, "formula": 0.0, "other": 0.0, "signature": 0.0}}, "representation": "CF1F1F70F140036860F1441B5", "position": {"x1": 707, "x2": 718, "y1": 481, "y2": 531, "pageNumber": 1}, "geometry": {"width": 11, "height": 50}, "alpha": true, "filters": {"geometry": {"imageSize": {"quotient": 0.0337, "tooLarge": false, "tooSmall": true}, "imageFormat": {"quotient": 0.22, "tooTall": false, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": false}}, {"classification": {"label": "logo", "probabilities": {"logo": 0.9704, "other": 0.0223, "formula": 0.0044, "signature": 0.0029}}, "representation": "CF0F1C70F1C7090081F7CF073", "position": {"x1": 732, "x2": 744, "y1": 118, "y2": 241, "pageNumber": 1}, "geometry": {"width": 12, "height": 123}, "alpha": true, "filters": {"geometry": {"imageSize": {"quotient": 0.0552, "tooLarge": false, "tooSmall": false}, "imageFormat": {"quotient": 0.0976, "tooTall": true, "tooWide": false}}, "probability": {"unconfident": false}, "allPassed": false}}], "dataCV": []}
\ No newline at end of file
diff --git a/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.pdf b/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.pdf
new file mode 100644
index 0000000..dd3c97a
Binary files /dev/null and b/ocr-service-v1/ocr-service-server-v1/src/test/resources/files/ComplexLayeredElements.pdf differ