图像读取、显示、保存

关键语句

• 图像读取 retval = cv2.imread()
• 图像显示 cv2.imshow('Your_window_title', retval)
• 图像保存 cv2.imwrite()

代码如下：

import cv2

IMG_PATH = '.\img\\'
IMG_SAVE = '.\save\\'
# lena = cv2.imread('lena.png', -1)
lena = IMG_PATH + 'lena.png'


def show_img(file=lena):
    """展示图片"""
    lena = cv2.imread(file, -1)
    cv2.imshow('lena', lena)
    key = cv2.waitKey()
    if key == ord('A'):
        cv2.imshow("PressA", lena)
    elif key == ord('B'):
        cv2.imshow("PressB", lena)
    cv2.waitKey()
    cv2.destroyAllWindows()


def save_img(file=lena):
    """保存图片"""
    lena = cv2.imread(file, -1)
    retval = cv2.imwrite('dd.png', lena)
    return retval


if __name__ == '__main__':
    save_img ()