<p>我正在使用OpenCV(2.4)和Python(2.7.3)以及来自Thorlabs(DC1545M)的USB摄像头。</p>
<p>我正在视频流上做一些图像分析,我希望能够从我的视频流中更改一些相机参数。令人困惑的是,我可以改变一些相机属性,但不是所有的,我不确定我做错了什么。</p>
<p>下面是使用Python中的cv2绑定的代码,我可以确认它是否运行:</p>
<pre><code>import cv2
#capture from camera at location 0
cap = cv2.VideoCapture(0)
#set the width and height, and UNSUCCESSFULLY set the exposure time
cap.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:
break
cv2.destroyAllWindows()
cv2.VideoCapture(0).release()
</code></pre>
<p>作为参考,<em>cap.set()</em>命令中的第一个参数引用摄影机属性的枚举,如下所示:</p>
<pre><code>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 file
3. 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
18. CV_CAP_PROP_RECTIFICATION Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently)
</code></pre>
<p>我的问题是:</p>
<p><strong>是否可以通过python/opencv设置相机曝光时间(或其他相机参数)?</strong></p>
<p><strong>如果没有,我将如何设置这些参数?</strong></p>
注:由相机制造商提供的C++代码显示了如何做到这一点,但我不是C++中的专家(长镜头),并且会欣赏任何基于Python的解决方案。</p>
<p>提前谢谢!</p>