opencv VideoCapture.set灰度? [英] opencv VideoCapture.set greyscale?

问题描述

我会避免使用cvtColor(frame, image, CV_RGB2GRAY);
转换摄像机拍摄的每一帧 无论如何，是否可以将VideoCapture设置为直接获得灰度?

I would avoid to convert each frame taken by video camera with cvtColor(frame, image, CV_RGB2GRAY);
Is there anyway to set VideoCapture to get directly in greyscale?

示例:

VideoCapture cap(0);

cap.set(CV_CAP_PROP_FRAME_WIDTH,420);
cap.set(CV_CAP_PROP_FRAME_HEIGHT,340);
cap.set(CV_CAP_GREYSCALE,1); //< ???

推荐答案

这是不可能的.这是所有代码的列表:

This is impossible. Here's list of all codes:

CV_CAP_PROP_POS_MSEC - position in milliseconds from the file beginning
CV_CAP_PROP_POS_FRAMES - position in frames (only for video files)
CV_CAP_PROP_POS_AVI_RATIO - position in relative units (0 - start of the file, 1 - end of the file)
CV_CAP_PROP_FRAME_WIDTH - width of frames in the video stream (only for cameras)
CV_CAP_PROP_FRAME_HEIGHT - height of frames in the video stream (only for cameras)
CV_CAP_PROP_FPS - frame rate (only for cameras)
CV_CAP_PROP_FOURCC - 4-character code of codec (only for cameras).

或者(如果可能，使用某些实用程序)可以将相机设置为仅显示灰度图像.

Or (if it's possible, using some utilities) you can setup your camera to show only grayscale image.

要将彩色图像转换为灰度图像，必须调用 cvtColor ，代码为CV_BGR2GRAY.这应该不会花很多时间.

To convert colored image to grayscale you have to call cvtColor with code CV_BGR2GRAY. This shouldn't take much time.

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