是否可以使用python中的opencv将图像中的亮度调整为更暗？

Question

Is that possible to reduce the brightness area and i want the result like below

This is the part that i want the brightness area to become with

Answer 1

You can change the brightness of the whole picture but I'm not sure how to make a part of it. I think this link helps you.

Answer 2

1. Determine the brightness region in your image. My solution is that I counted each pixel(channel value > 100) in each column and decided a reference number. If the number is bigger than the reference(I chose 55), I considered columns is close to bright(255).
2. After first step, the brightness area is clear so just crop that area.
3. Decrease the brightness of the area. Helpful link is here to decrease brightness.
4. After decreasing the brightness just replace it with the original part in the source image.

Here is the solution for first step and result.

import cv2

img=cv2.imread("/ur/source/image/bright.png")
height, width, channels = img.shape

thresh = [100,100,100]
white = [255,255,255]
white_counter = 0

for x in range(0,width):
    for y in range(0,height):
        channels_xy = img[y,x]
        if all(channels_xy >= thresh):    
            white_counter += 1

    if(white_counter>55):
        for k in range(0,height): 
            img[k,x] = white

    white_counter = 0

cv2.imshow('Result',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Result: