使用OpenCV（Python）掩盖图像

Question

我制作了这个代码，创建了2个掩码。应用后，结果如下：

原始图片

输出

import cv2
import numpy as np

frame = cv2.imread('image.jpg')

h, w = frame.shape[:2]

upper_value = int(h / 10) * 5
lower_value = -(int(h / 10) * 3)

upper_mask = cv2.rectangle(frame, (0, 0), (w, upper_value), (0, 50, 255), -1)
lower_mask = cv2.rectangle(frame, (0, upper_value + int(h / 10) * 5), (w, upper_value + int(h / 10) * 2), (0, 50, 255), -1)

我知道代码它根本不是好事，而是做它的工作。我该如何改进呢？

由于

Answer 1

以下是一些建议：

import cv2
import numpy as np

frame = cv2.imread('image.jpg')

h, w = frame.shape[:2]
mask_color = (0, 50, 255) # isolate a repeating constant

# avoid setting a variable that is used only once, only if you REALLY need it to improve readability
# that's why `upper_value` and `lower_value` were removed. 
# BTW, `lower_value` was unused in your code.

upper_mask = cv2.rectangle(frame, (0, 0), (w, int(0.5 * h)), mask_color, -1)
lower_mask = cv2.rectangle(frame, (0, h), (w, int(0.7 * h)), mask_color, -1)