diff --git a/src/main/java/com/iqser/red/pdftronlogic/commons/ImageHashFactory.java b/src/main/java/com/iqser/red/pdftronlogic/commons/ImageHashFactory.java
index 14fb7f8..308b5ed 100644
--- a/src/main/java/com/iqser/red/pdftronlogic/commons/ImageHashFactory.java
+++ b/src/main/java/com/iqser/red/pdftronlogic/commons/ImageHashFactory.java
@@ -16,6 +16,22 @@ import lombok.experimental.UtilityClass;
 @UtilityClass
 public class ImageHashFactory {
 
+    @SneakyThrows
+    public String calculate(Element element) {
+
+        com.pdftron.pdf.Image image = new com.pdftron.pdf.Image(element.getXObject());
+
+        byte[] imageBytes = getBytesOfImage(image);
+        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(imageBytes);
+        BufferedImage image1 = ImageIO.read(byteArrayInputStream);
+
+        String hash = getSimplePHash(image1);
+
+        return hash;
+
+    }
+
+
     @SneakyThrows
     private byte[] getBytesOfImage(com.pdftron.pdf.Image inputImage) {
         // 0 because the memory filter determines the size
@@ -31,19 +47,7 @@ public class ImageHashFactory {
         filterWriter.destroy();
         return res;
     }
-    @SneakyThrows
-    public String calculate(Element element) {
-        com.pdftron.pdf.Image image = new com.pdftron.pdf.Image(element.getXObject());
 
-        byte[] imageBytes = getBytesOfImage(image);
-        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(imageBytes);
-        BufferedImage image1 = ImageIO.read(byteArrayInputStream);
-
-        String hash = getSimplePHash(image1);
-
-        return hash;
-
-    }
 
     public String getSimplePHash(BufferedImage image) {
         // Resize the image to a fixed size (e.g., 8x8 pixels)
@@ -74,8 +78,10 @@ public class ImageHashFactory {
         return hashBuilder.toString();
     }
 
+
     // Helper method to calculate the average grayscale pixel value
     private int calculateAverage(BufferedImage image) {
+
         int total = 0;
         int width = image.getWidth();
         int height = image.getHeight();
@@ -87,30 +93,4 @@ public class ImageHashFactory {
         return total / (width * height);
     }
 
-    // to hash images either use getDHash or getSimplePHash
-    public String getDHash(BufferedImage image) throws Exception {
-        BufferedImage resizedImage = resizeImage(image, 9, 8); // Resize image to 9x8 for dHash
-
-        long hash = 0L;
-        for (int y = 0; y < 8; y++) {
-            for (int x = 0; x < 8; x++) {
-                int leftPixel = resizedImage.getRGB(x, y);
-                int rightPixel = resizedImage.getRGB(x + 1, y);
-                hash <<= 1;
-                hash |= leftPixel < rightPixel ? 1 : 0;
-            }
-        }
-
-        return Long.toHexString(hash);
-    }
-
-    // Helper method to resize the image to the desired dimensions
-    private BufferedImage resizeImage(BufferedImage image, int width, int height) {
-        BufferedImage resizedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
-        resizedImage.getGraphics().drawImage(image, 0, 0, width, height, null);
-        return resizedImage;
-    }
-
-
-
 }
diff --git a/src/main/java/com/iqser/red/pdftronlogic/commons/WatermarkRemovalService.java b/src/main/java/com/iqser/red/pdftronlogic/commons/WatermarkRemovalService.java
index f436047..b318df1 100644
--- a/src/main/java/com/iqser/red/pdftronlogic/commons/WatermarkRemovalService.java
+++ b/src/main/java/com/iqser/red/pdftronlogic/commons/WatermarkRemovalService.java
@@ -66,7 +66,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static Map<Long, List<ElementFeatures>> findAllFormObjectsAndImages(PDFDoc pdfDoc) {
+    private Map<Long, List<ElementFeatures>> findAllFormObjectsAndImages(PDFDoc pdfDoc) {
 
         List<ElementFeatures> formObjectsOccuringMoreThanOnceOnAPage = new LinkedList<>();
         Map<Long, List<ElementFeatures>> formObjectsAndImagesForPages = new HashMap<>();
@@ -98,7 +98,7 @@ public class WatermarkRemovalService {
     }
 
 
-    private static void processElement(Element element,
+    private void processElement(Element element,
                                        Set<Long> visitedXObjIds,
                                        List<ElementFeatures> elementFeaturesLinkedList,
                                        List<ElementFeatures> formObjectsOccuringMoreThanOnceOnAPage,
@@ -120,7 +120,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static void processImages(Element element, List<ElementFeatures> elementFeaturesLinkedList) {
+    private void processImages(Element element, List<ElementFeatures> elementFeaturesLinkedList) {
 
         String hashOfImage = ImageHashFactory.calculate(element);
         ElementFeatures elementFeatures = ElementFeatureFactory.extractFeaturesWithHash(element, hashOfImage);
@@ -129,7 +129,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static void processXObject(Element element,
+    private void processXObject(Element element,
                                        Set<Long> visitedXObjIds,
                                        List<ElementFeatures> elementFeaturesLinkedList,
                                        List<ElementFeatures> formObjectsOccuringMoreThanOnceOnAPage,
@@ -152,7 +152,7 @@ public class WatermarkRemovalService {
     /*
         parameter
      */
-    private static List<ElementFeatures> filterSameFormObjectsOccuringOnMostPages(Map<Long, List<ElementFeatures>> formObjectsPerPage) {
+    private List<ElementFeatures> filterSameFormObjectsOccuringOnMostPages(Map<Long, List<ElementFeatures>> formObjectsPerPage) {
 
         int pageCount = formObjectsPerPage.keySet().size();
         int minPagesFilter = (int) (OCCURING_ON_PAGES_THRESHOLD_FACTOR * pageCount);
@@ -169,7 +169,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static void removeAllWatermarks(PDFDoc pdfDoc, List<ElementFeatures> watermarksElementFeaturesList) {
+    private void removeAllWatermarks(PDFDoc pdfDoc, List<ElementFeatures> watermarksElementFeaturesList) {
 
         ElementReader reader = new ElementReader();
         ElementWriter writer = new ElementWriter();
@@ -190,7 +190,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static void writeAllElementsExceptWatermarks(Page page,
+    private void writeAllElementsExceptWatermarks(Page page,
                                                          ElementReader reader,
                                                          ElementWriter writer,
                                                          List<ElementFeatures> watermarksElementFeaturesList,
@@ -204,7 +204,7 @@ public class WatermarkRemovalService {
     }
 
 
-    private static void processElements(Page page,
+    private void processElements(Page page,
                                         ElementReader reader,
                                         ElementWriter writer,
                                         List<ElementFeatures> watermarksElementFeaturesList,
@@ -232,7 +232,7 @@ public class WatermarkRemovalService {
 
 
     @SneakyThrows
-    private static void removeImages(Element element, ElementWriter writer, List<ElementFeatures> watermarksElementFeaturesList) {
+    private void removeImages(Element element, ElementWriter writer, List<ElementFeatures> watermarksElementFeaturesList) {
 
         String hashValueOfImage = ImageHashFactory.calculate(element);
         ElementFeatures imageFeatures = ElementFeatureFactory.extractFeaturesWithHash(element, hashValueOfImage);
@@ -246,7 +246,7 @@ public class WatermarkRemovalService {
     }
 
 
-    private static void processForms(Page page,
+    private void processForms(Page page,
                                      Element element,
                                      ElementReader reader,
                                      ElementWriter writer,