我想保存带轮廓的图像
这是我的代码:
img = cv2.imread('123.png')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
ret, binary = cv2.threshold(gray, 150, 255, cv2.THRESH_BINARY)
image, contours, _ = cv2.findContours(binary, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
for cnt in contours:
# some code in here
cv2.imwrite('234.jpg', cnt)
非常感谢。
答案 0 :(得分:1)
你想要做的是创建一个用于绘制轮廓的面具,然后用它来剪掉图片的其余部分,反之亦然。例如,based on this tutorial:
(contours, _) = cv2.findContours(binary, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
mask = np.ones(img.shape[:2], dtype="uint8") * 255
# Draw the contours on the mask
cv2.drawContours(mask, contours, -1, 0, -1)
# remove the contours from the image and show the resulting images
img = cv2.bitwise_and(img, img, mask=mask)
cv2.imshow("Mask", mask)
cv2.imshow("After", img)
cv2.waitKey(0)
答案 1 :(得分:0)
将轮廓保存为图像的最简单方法是取出其ROI(图像区域),然后使用imwrite()进行保存,如下所示-
首先使用cv2.boundingRect获取一组点(即轮廓)的边界矩形:
x, y, width, height = cv2.boundingRect(contours[i])
然后您可以使用NumPy索引从图像中获取投资回报率:
roi = img[y:y+height, x:x+width]
并将ROI保存到新文件:
cv2.imwrite("roi.png", roi)
答案 2 :(得分:0)
我尝试了很多次,终于成功了:
image= cv2.imread('muroprueba.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
ret, binary = cv2.threshold(gray, 150, 255, cv2.THRESH_BINARY)
cnts, herarchy = cv2.findContours(thresh,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)
cv2.drawContours(image,cnts,-1,(0,255,0),1)
cv2.imshow('image1',image)
cv2.waitKey(0)
cv2.imwrite('F:\caso1.jpg',image) #Save the image
cv2.destroyAllWindows()