Python实现图片的反转、灰度压缩、灰度拉伸等

代码

import numpy as np
import cv2
import matplotlib.pyplot as plt


# 定义限行灰度变化函数
# k>1时实现灰度数值的拉伸
# 0 255] = 255
    trans_table[trans_table < 0] = 0
    trans_table = np.round(trans_table).astype(np.uint8)

    # 使用OpenCV的look up table函数修改图像的灰度值
    return cv2.LUT(img, trans_table)


if __name__ == '__main__':
    im = cv2.imread('data/lena.jpg', 0)
    cv2.imshow('im', im)

    # 反转
    im_inversion = liner_trans(im, -1, 255)
    cv2.imshow("inversion", im_inversion)

    # 灰度压缩
    im_compress = liner_trans(im, 0.5)
    cv2.imshow('im_compress', im_compress)

    # 灰度拉伸
    im_stretch = liner_trans(im, 1.2)
    cv2.imshow('grayStretch', im_stretch)

    cv2.waitKey()
    cv2.destroyAllWindows()

实现效果