来自 YUV 的 Opencv imshow Y

Question

我正在尝试提取和显示

YUV 转换图像的 Y channel

我的代码如下:

Mat src, src_resized, src_gray;

src = imread("11.jpg", 1);

resize(src, src_resized, cvSize(400, 320));

cvtColor(src_resized, src_resized, cv::COLOR_BGR2RGB);

/*
I've tried both with and without the upper conversion 
(mentioned here as bug 
http://stackoverflow.com/questions/7954416/converting-yuv-into-bgr-or-rgb-in-opencv 
 in an opencv 2.4.* version - mine is 2.4.10 )
*/

cvtColor(src_resized, src_gray, CV_RGB2YUV); //YCrCb

vector<Mat> yuv_planes(3);
split(src_gray,yuv_planes);

Mat g, fin_img;

g = Mat::zeros(Size(src_gray.cols, src_gray.rows),0);

 // same result withg = Mat::zeros(Size(src_gray.cols, src_gray.rows), CV_8UC1);

vector<Mat> channels;

channels.push_back(yuv_planes[0]);
channels.push_back(g);
channels.push_back(g);

merge(channels, fin_img);

imshow("Y ", fin_img);

waitKey(0);

return 0;

因此，我期待的是显示发光的灰色图像。

相反，我根据(第一/第二/第三)的位置获得 B/G/R channel 图像

channels.push_back(yuv_planes[0]);

如图所示:

我错过了什么？ (我打算用亮度做行/列的求和，然后用得到的数据提取车牌)

Answer 1

问题是只在一个 channel 中显示发光，而不是用它填充所有 channel 。

如果其他人遇到同样的问题，只需更改

Mat g, fin_img;

g = Mat::zeros(Size(src_gray.cols, src_gray.rows),0);

vector<Mat> channels;

channels.push_back(yuv_planes[0]);
channels.push_back(g);
channels.push_back(g);

到(用想要的 channel 填充所有 channel )

Mat  fin_img;

vector<Mat> channels;

channels.push_back(yuv_planes[0]);
channels.push_back(yuv_planes[0]);
channels.push_back(yuv_planes[0]);