使用 drawContours() thickness=-1 填充轮廓将不起作用

Question

我正在尝试填充通过分别对 3 个颜色通道进行阈值处理而获得的轮廓。

image_original = cv2.imread(original_image_path)
image_contours = np.zeros((image_original.shape[0], image_original.shape[1], 1), dtype=np.uint8)
image_contour = np.zeros((image_original.shape[0], image_original.shape[1], 1), dtype=np.uint8)
image_binary = np.zeros((image_original.shape[0], image_original.shape[1], 1), dtype=np.uint8)
image_area = image_original.shape[0] * image_original.shape[1]
for channel in range(image_original.shape[2]):
    ret, image_thresh = cv2.threshold(image_original[:, :, channel], 120, 255, cv2.THRESH_OTSU)
    _, contours, hierarchy = cv2.findContours(image_thresh, 1, 1)
    for index, contour in enumerate(contours):
        if( cv2.contourArea( contour )  > image_area * background_remove_offset ):
            del contours[index]
    cv2.drawContours(image_contours, contours, -1, (255,255,255), 3)
_, contours, hierarchy = cv2.findContours(image_contours,  cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
cv2.drawContours(image_contour, max(contours, key = cv2.contourArea), -1, (255, 255, 255), 1)
cv2.imwrite(output_contour_image_path, image_contour)
cv2.drawContours(image_binary, max(contours, key = cv2.contourArea), -1, (255, 255, 255), thickness=-1)
cv2.imwrite(output_binary_image_path, image_binary)
cv2.imshow("binary", image_binary)

它应该通过设置 thickness=-1 来工作，但它只绘制了与 thickness=1 相同的 1 厚度的轮廓，具体在以下行中。

cv2.drawContours(image_binary, max(contours, key = cv2.contourArea), -1, (255, 255, 255), thickness=-1)

结果如下，

除了轮廓厚度为 1 的图像之外，还应该提供二进制填充图像

Answer 1

好吧，解决了 cv2.drawContours() 函数似乎需要等高线作为列表类型，只需更改行

cv2.drawContours(image_binary, max(contours, key = cv2.contourArea), -1, 255, thickness=-1)

到

cv2.drawContours(image_binary, [max(contours, key = cv2.contourArea)], -1, 255, thickness=-1)

解决了。

使用 drawContours() thickness=-1 填充轮廓将不起作用

Filling contour won't work using drawContours() thickness=-1

opencv

computer-vision

python-3.x

opencv3.0

opencv-contour