在OpenCV / Python中设置摄像机参数

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问题描述

我使用来自Thorlabs（DC1545M）的USB相机使用OpenCV（2.4）和Python（2.7.3）。

I am using OpenCV (2.4) and Python (2.7.3) with a USB camera from Thorlabs (DC1545M).

我正在做一些图像分析视频流，我想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。

I am doing some image analysis on a video stream and I would like to be able to change some of the camera parameters from my video stream. The confusing thing is that I am able to change some of the camera properties but not all of them, and I am unsure of what I am doing wrong.

这里是代码，使用Python中的cv2绑定，我可以确认它运行：

Here is the code, using the cv2 bindings in Python, and I can confirm that it runs:

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()

作为参考， cap.set（）命令中的第一个参数是指相机属性，如下所示：

For reference, the first argument in the cap.set() command refers to the enumeration of the camera properties, listed below:

0。 CV_CAP_PROP_POS_MSEC视频的当前位置

0. CV_CAP_PROP_POS_MSEC Current position of the video file in milliseconds.

CV_CAP_PROP_POS_FRAMES下一个要解码/捕获的帧的基于0的索引。

CV_CAP_PROP_POS_AVI_RATIO视频文件的相对位置

CV_CAP_PROP_FRAME_WIDTH视频流中的帧宽度。

CV_CAP_PROP_FRAME_HEIGHT视频流中的帧高

CV_CAP_PROP_FPS帧率。

CV_CAP_PROP_FOURCC编解码器的4个字符代码。

CV_CAP_PROP_FORMAT由retrieve（）返回的Mat对象的格式。

CV_CAP_PROP_MODE表示当前捕获模式的后端特定值。

CV_CAP_PROP_BRIGHTNESS图片的亮度（仅适用于相机） $ b
CV_CAP_PROP_SATURATION图片的饱和度（仅适用于相机）。

CV_CAP_PROP_HUE图片的色调（仅适用于相机）。

CV_CAP_PROP_GAIN

CV_CAP_PROP_CONVERT_RGB指示图片是否应转换为图片的布尔值标记

CV_CAP_PROP_RECTIFICATION立体相机的校正标志（注意：目前只有DC1394 v 2.x后端支持）

CV_CAP_PROP_POS_FRAMES 0-based index of the frame to be decoded/captured next.
CV_CAP_PROP_POS_AVI_RATIO Relative position of the video file
CV_CAP_PROP_FRAME_WIDTH Width of the frames in the video stream.
CV_CAP_PROP_FRAME_HEIGHT Height of the frames in the video stream.
CV_CAP_PROP_FPS Frame rate.
CV_CAP_PROP_FOURCC 4-character code of codec.
CV_CAP_PROP_FRAME_COUNT Number of frames in the video file.
CV_CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .
CV_CAP_PROP_MODE Backend-specific value indicating the current capture mode.
CV_CAP_PROP_BRIGHTNESS Brightness of the image (only for cameras).
CV_CAP_PROP_CONTRAST Contrast of the image (only for cameras).
CV_CAP_PROP_SATURATION Saturation of the image (only for cameras).
CV_CAP_PROP_HUE Hue of the image (only for cameras).
CV_CAP_PROP_GAIN Gain of the image (only for cameras).
CV_CAP_PROP_EXPOSURE Exposure (only for cameras).
CV_CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB.
CV_CAP_PROP_WHITE_BALANCE Currently unsupported
CV_CAP_PROP_RECTIFICATION Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently)

我的问题是：

可以设置相机曝光时间（或其他相机参数）通过python / opencv？

如果不是，我将如何设置这些参数？

注意：有一个C ++代码由相机制造商提供，显示如何做到这一点，但我不是一个专家（通过远程）在C + +，任何基于python的解决方案。

Note: There is C++ code provided by the camera manufacturer showing how to do this, but I'm not an expert (by a long shot) in C++ and would appreciate any python-based solution.

提前感谢！

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在OpenCV / Python中设置摄像机参数

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