", cv2.IMREAD_UNCHANGED)
#灰度图像
p = img[88, 142]
print(p)
#显示图像
cv2.imshow("Demo", img)
#等待显示
cv2.waitKey...img[78, 125]
print(bgr)
#显示图像
cv2.imshow("Demo", img)
#等待显示
cv2.waitKey(0)
cv2.destroyAllWindows()...#BGR图像
img[100:150, 400:500] = [255, 255, 0]
#显示图像
cv2.imshow("Demo", img)
#等待显示
cv2.waitKey(0)
cv2...#绘制矩形
cv2.rectangle(img, (20,20), (150,250), (255,0,0), 2)
#显示图像
cv2.imshow("rectangle", img)
#等待显示...,
(10, 100), font, 0.6, (255, 255, 0), 2)
#显示图像
cv2.imshow("polylines", img)
#等待显示
cv2.