parser.py 文件源码

def get_image_xy_corner(self):
        """get ?artesian coordinates from raster"""
        import cv2

        if not self.image_path:
            return False
        image_xy_corners = []
        img = cv2.imread(self.image_path, cv2.IMREAD_GRAYSCALE)
        imagem = (255 - img)

        try:
            ret, thresh = cv2.threshold(imagem, 10, 128, cv2.THRESH_BINARY)
            try:
                contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
            except Exception:
                im2, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_SIMPLE)

            hierarchy = hierarchy[0]
            hierarhy_contours = [[] for _ in range(len(hierarchy))]
            for fry in range(len(contours)):
                currentContour = contours[fry]
                currentHierarchy = hierarchy[fry]
                cc = []
                # epsilon = 0.0005 * cv2.arcLength(contours[len(contours) - 1], True)
                approx = cv2.approxPolyDP(currentContour, self.epsilon, True)
                if len(approx) > 2:
                    for c in approx:
                        cc.append([c[0][0], c[0][1]])
                    parent_index = currentHierarchy[3]
                    index = fry if parent_index < 0 else parent_index
                    hierarhy_contours[index].append(cc)

            image_xy_corners = [c for c in hierarhy_contours if len(c) > 0]
            return image_xy_corners
        except Exception as ex:
            self.error(ex)
        return image_xy_corners