我正在使用來自Thorlabs（DC1545M）的USB攝像機(jī)的OpenCV（2.4）和Python（2.7.3）。我正在對視頻流進(jìn)行一些圖像分析，我希望能夠從我的視頻流中更改某些相機(jī)參數(shù)。令人困惑的是，我可以更改某些相機(jī)屬性，但不能更改所有屬性，而且我不確定自己做錯(cuò)了什么。這是在Python中使用cv2綁定的代碼，我可以確認(rèn)它可以運(yùn)行：import cv2#capture from camera at location 0cap = cv2.VideoCapture(0)#set the width and height, and UNSUCCESSFULLY set the exposure timecap.set(3,1280)cap.set(4,1024)cap.set(15, 0.1)while True:    ret, img = cap.read()    cv2.imshow("input", img)    #cv2.imshow("thresholded", imgray*thresh2)    key = cv2.waitKey(10)    if key == 27:        breakcv2.destroyAllWindows() cv2.VideoCapture(0).release()作為參考，cap.set（）命令中的第一個(gè)參數(shù)引用相機(jī)屬性的枚舉，如下所示：0. CV_CAP_PROP_POS_MSEC Current position of the video file in milliseconds.1. CV_CAP_PROP_POS_FRAMES 0-based index of the frame to be decoded/captured next.2. CV_CAP_PROP_POS_AVI_RATIO Relative position of the video file3. CV_CAP_PROP_FRAME_WIDTH Width of the frames in the video stream.4. CV_CAP_PROP_FRAME_HEIGHT Height of the frames in the video stream.5. CV_CAP_PROP_FPS Frame rate.6. CV_CAP_PROP_FOURCC 4-character code of codec.7. CV_CAP_PROP_FRAME_COUNT Number of frames in the video file.8. CV_CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .9. CV_CAP_PROP_MODE Backend-specific value indicating the current capture mode.10. CV_CAP_PROP_BRIGHTNESS Brightness of the image (only for cameras).11. CV_CAP_PROP_CONTRAST Contrast of the image (only for cameras).12. CV_CAP_PROP_SATURATION Saturation of the image (only for cameras).13. CV_CAP_PROP_HUE Hue of the image (only for cameras).14. CV_CAP_PROP_GAIN Gain of the image (only for cameras).15. CV_CAP_PROP_EXPOSURE Exposure (only for cameras).16. CV_CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB.17. CV_CAP_PROP_WHITE_BALANCE Currently unsupported我的問題是：是否可以通過python / opencv設(shè)置相機(jī)曝光時(shí)間（或其他相機(jī)參數(shù)）？如果沒有，我將如何設(shè)置這些參數(shù)？注意：相機(jī)制造商提供了C ++代碼來顯示如何執(zhí)行此操作，但是我不是C ++的專家（長期來看），并且希望使用任何基于python的解決方案。提前致謝！