HYTOS

            area = app_doc_data.getArea('Drawing')

            # remove line from image

            imgDiff = np.zeros(app_doc_data.imgSrc.shape, np.uint8)

            imgDiff[round(area.y + 1):round(area.y + area.height),

                           round(area.x + 1):round(area.x + area.width)] = \

                app_doc_data.imgSrc[round(area.y + 1):round(area.y + area.height),

                           round(area.x + 1):round(area.x + area.width)]

            lines = app_doc_data.lines

            for line in lines:

                line.drawToImage(imgDiff, 255, thickness) if line.thickness is None else \

                    line.drawToImage(imgDiff, 255, line.thickness)

            # up to here

            imgNot = np.ones(imgDiff.shape, np.uint8)

            cv2.bitwise_not(imgDiff, imgNot)

            configs = app_doc_data.getConfigs('Filter', 'ErodeSize')

            kernel = int(configs[0].value) if 1 == len(configs) else 3

            imgNot = cv2.erode(imgNot, np.ones((kernel, kernel), np.uint8))

            imgNot = cv2.dilate(imgNot, np.ones((8 + kernel, 8 + kernel), np.uint8))

            contours, hierarchy = cv2.findContours(imgNot, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

            ##

            idx = 0

            ##

            smallContours = []

            minimumSize = app_doc_data.getConfigs('Filter', 'MinimumSize')

            for contour in contours:

                [x, y, w, h] = cv2.boundingRect(contour)

                # remove too small one

                if len(minimumSize) is 1:

                    if w * h < int(minimumSize[0].value) * int(minimumSize[0].value):

                        smallContours.append(contour)

                        idx += 1

                        continue

                # create unknown item

                epsilon = cv2.arcLength(contour, True) * 0.001

                approx = cv2.approxPolyDP(contour, epsilon, True)

                approx = [pt[0] for pt in approx]

                resultStr, resultList = self.determine_remain_object(idx, contours, imgNot)

                if resultStr == 'LineIndicator':

                    item = QEngineeringUnknownItem(approx, 'True', resultList[0], resultList[1])

                    app_doc_data.lineIndicators.append(item)

                elif resultStr == 'MissingLine':

                    idx += 1

                    continue

                elif resultStr == 'Unknown':

                    item = QEngineeringUnknownItem(approx, 'False')

                    app_doc_data.unknowns.append(item)

                item.area = 'Drawing'

                app_doc_data.allItems.append(item)

                idx += 1

                # up to here

            """

            """