resolving issue https://github.com/qurator-spk/eynollah/issues/38

qurator/eynollah/eynollah.py

@@ -1869,6 +1869,8 @@ class Eynollah:
         if np.abs(slope_deskew) >= SLOPE_THRESHOLD:
             contours_only_text, hir_on_text = return_contours_of_image(text_only)
             contours_only_text_parent = return_parent_contours(contours_only_text, hir_on_text)
+                        
+            if len(contours_only_text_parent) > 0:
                 areas_cnt_text = np.array([cv2.contourArea(contours_only_text_parent[j]) for j in range(len(contours_only_text_parent))])
                 areas_cnt_text = areas_cnt_text / float(text_only.shape[0] * text_only.shape[1])
                 self.logger.info('areas_cnt_text %s', areas_cnt_text)
@@ -1932,10 +1934,15 @@ class Eynollah:
                     # img2=cv2.fillPoly(img2,pts=[contours_only_text_parent_d[np.argmin(dists)]] ,color=(1,1,1))
                     # plt.imshow(img2[:,:,0])
                     # plt.show()
+            else:
+                contours_only_text_parent_d_ordered = []
+                contours_only_text_parent_d = []
+                
         else:
             contours_only_text, hir_on_text = return_contours_of_image(text_only)
             contours_only_text_parent = return_parent_contours(contours_only_text, hir_on_text)
             
+            if len(contours_only_text_parent) > 0:
                 areas_cnt_text = np.array([cv2.contourArea(contours_only_text_parent[j]) for j in range(len(contours_only_text_parent))])
                 areas_cnt_text = areas_cnt_text / float(text_only.shape[0] * text_only.shape[1])
 
@@ -1952,6 +1959,8 @@ class Eynollah:
                 self.logger.debug('areas_cnt_text_parent %s', areas_cnt_text_parent)
                 # self.logger.debug('areas_cnt_text_parent_d %s', areas_cnt_text_parent_d)
                 # self.logger.debug('len(contours_only_text_parent) %s', len(contours_only_text_parent_d))
+            else:
+                pass
         txt_con_org = get_textregion_contours_in_org_image(contours_only_text_parent, self.image, slope_first)
         boxes_text, _ = get_text_region_boxes_by_given_contours(contours_only_text_parent)
         boxes_marginals, _ = get_text_region_boxes_by_given_contours(polygons_of_marginals)

qurator/eynollah/utils/__init__.py

@@ -1560,7 +1560,11 @@ def find_number_of_columns_in_document(region_pre_p, num_col_classifier, pixel_l
         
         #regions_without_separators_tile=cv2.erode(regions_without_separators_tile,kernel,iterations = 3)
         #
-        num_col, peaks_neg_fin=find_num_col(regions_without_separators_tile,multiplier=7.0)
+        try:
+            num_col, peaks_neg_fin = find_num_col(regions_without_separators_tile,multiplier=7.0)
+        except:
+            num_col = 0
+            peaks_neg_fin = []
         
         if num_col>num_col_fin:
             num_col_fin=num_col