使用opencv拍摄高分辨率和高质量图片

思路：手动设置cap的宽高，然后保存的时候设置图片质量即可

import cv2
import time
if __name__ == '__main__':
    #2代表的是摄像头设备号,可以通过ls -al /dev/ | grep video 进行查看,可能多个摄像头需要哪个自行选择
    cap = cv2.VideoCapture(2)
    # cap.open(0, cv2.CAP_DSHOW);
    r1 = cap.set(3, 3264)#2592
    print('r1 = ', r1)
    r2 = cap.set(4, 2448)#1944
    print('r2 = ', r2)
    print(cap.get(cv2.CAP_PROP_FPS))
    cv2.namedWindow('img', 0)

    while True:
        ret, img = cap.read()
        print(img.shape)
        cv2.imshow('img', img)
        if cv2.waitKey(0) == ord('s'):
            #IMWRITE_JPEG_QUALITY   0-100    IMWRITE_PNG_COMPRESSION 0-9
            cv2.imwrite(str(time.time()) + '.jpg', img, [int(cv2.IMWRITE_JPEG_QUALITY), 100])
    cv2.destroyAllWindows()
    cap.release()