来自OpenCV的摄像头的Android模板匹配 [英] OpenCV Android template matching from camera
问题描述
我想要的图像匹配在Android上的摄像机输入。当我尝试用2图像一切工作就好了。但现在我喜欢做同样的事情用相机输入。要完成这件事,我实现CvCameraViewListener2并尝试以下code:
I'm trying to match an image with the camera input in Android. When I try this with 2 images everything works just fine. But now I like to do the same thing with the camera input. To get this done I implemented CvCameraViewListener2 and tried the following code:
@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
int match_method = Imgproc.TM_CCOEFF;
mSizeRgba = mRgba.size();
int rows = (int) mSizeRgba.height;
int cols = (int) mSizeRgba.width;
Mat templ = Highgui.imread(getFileAbsPath("template.jpg"));
// Create the result matrix
int result_cols = cols - templ.cols() + 1;
int result_rows = rows - templ.rows() + 1;
Mat result = new Mat(result_rows, result_cols, CvType.CV_32F);
Mat src = new Mat(result_rows, result_cols, CvType.CV_32F);
mRgba.convertTo(src, CvType.CV_32F);
Mat template = new Mat(templ.rows(), templ.cols(), CvType.CV_32F);
templ.convertTo(template, CvType.CV_32F);
// Do the Matching and Normalize
Imgproc.matchTemplate(src, templ, result, match_method);
Core.normalize(result, result, 0, 1, Core.NORM_MINMAX, -1, new Mat());
// Localizing the best match with minMaxLoc
MinMaxLocResult mmr = Core.minMaxLoc(result);
Point matchLoc;
if (match_method == Imgproc.TM_SQDIFF
|| match_method == Imgproc.TM_SQDIFF_NORMED) {
matchLoc = mmr.minLoc;
} else {
matchLoc = mmr.maxLoc;
}
Rect roi = new Rect((int) matchLoc.x, (int) matchLoc.y, templ.cols(),
templ.rows());
// Mat cropped = new Mat(mRgba, roi);
Core.rectangle(result, new Point(roi.x, roi.y), new Point(roi.width - 2, roi.height - 2), new Scalar(255, 0, 0, 255), 2);
return mRgba;
}
当我运行此code我得到这个OpenCV的错误:
When I run this code I get this OpenCV error:
OpenCV Error: Assertion failed ((img.depth() == CV_8U || img.depth() == CV_32F)
&& img.type() == templ.type()) in ...
谁能帮我解决这个问题?
Can anyone help me with this problem?
感谢
推荐答案
我解决我的问题。我需要模板的颜色转换BGR为RGBA。 用下面的$ C $词有没有崩溃了,但在preVIEW相机帧速度非常慢。这不正是我想要的。
I solved my problem. I needed to convert the color of the template from BGR to RGBA. With the following code i have no crashes anymore but the camera frames in the preview are very slow. This is not exactly what I want.
public void initialize(){
if (src.empty())
return;
if(template == null){
Mat templ = Highgui.imread(getFileAbsPath("template.png"), Highgui.CV_LOAD_IMAGE_UNCHANGED);
template = new Mat(templ.size(), CvType.CV_32F);
Imgproc.cvtColor(templ, template, Imgproc.COLOR_BGR2RGBA);
}
}
@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
src = inputFrame.rgba();
initialize();
int match_method = Imgproc.TM_SQDIFF;
// Create the result matrix
int result_cols = src.cols() - template.cols() + 1;
int result_rows = src.rows() - template.rows() + 1;
Mat result = new Mat(result_rows, result_cols, CvType.CV_32F);
// Do the Matching and Normalize
Imgproc.matchTemplate(src, template, result, match_method);
Core.normalize(result, result, 0, 1, Core.NORM_MINMAX, -1, new Mat());
// Localizing the best match with minMaxLoc
MinMaxLocResult mmr = Core.minMaxLoc(result);
Point matchLoc;
if (match_method == Imgproc.TM_SQDIFF || match_method == Imgproc.TM_SQDIFF_NORMED) {
matchLoc = mmr.minLoc;
} else {
matchLoc = mmr.maxLoc;
}
Rect roi = new Rect((int) matchLoc.x, (int) matchLoc.y, template.cols(), template.rows());
Core.rectangle(src, new Point(roi.x, roi.y), new Point(roi.width - 2, roi.height - 2), new Scalar(255, 0, 0, 255), 2);
return src;
}
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