python将YUV420P文件转PNG图片格式

方法一：

import os
import cv2 as cv
import numpy as np


# 读取yuv420p的一帧文件，并转化为png图片
if __name__ == ‘__main__‘:
    filepath = ‘one_frame_of_highway.yuv‘
    binfile = open(filepath, ‘rb‘)
    size = os.path.getsize(filepath)
    image_width = 352
    image_hight = 288
    image_y = [[0] * image_width for i in range(image_hight)]
    image_u = [[0] * image_width for i in range(image_hight)]
    image_v = [[0] * image_width for i in range(image_hight)]
    for r in range(image_hight):
        for c in range(image_width):
            image_y[r][c] = binfile.read(1)[0]
    Image_Y = np.array(image_y)

    for r in range(int(image_hight / 2)):
        for c in range(int(image_width / 2)):
            pixel = binfile.read(1)[0]
            image_u[2 * r + 0][2 * c + 0] = pixel
            image_u[2 * r + 1][2 * c + 0] = pixel
            image_u[2 * r + 0][2 * c + 1] = pixel
            image_u[2 * r + 1][2 * c + 1] = pixel
    Image_U = np.array(image_u)

    for r in range(int(image_hight / 2)):
        for c in range(int(image_width / 2)):
            pixel = binfile.read(1)[0]
            image_v[2 * r + 0][2 * c + 0] = pixel
            image_v[2 * r + 0][2 * c + 1] = pixel
            image_v[2 * r + 1][2 * c + 0] = pixel
            image_v[2 * r + 1][2 * c + 1] = pixel
    Image_V = np.array(image_v)
    binfile.close()
    compose = np.array([Image_Y, Image_V, Image_U]).transpose([1, 2, 0]).astype(np.uint8)
    Image = cv.cvtColor(compose, cv.COLOR_YUV2RGB)
    cv.imwrite("one_frame_of_highway.yuv.png", Image)