[英]OpenCV Android template matching from camera
我正在嘗試將圖像與Android中的相機輸入進行匹配。 當我嘗試2張圖片時,一切正常。 但是現在我喜歡用攝像機輸入做同樣的事情。 為此,我實現了CvCameraViewListener2並嘗試了以下代碼:
@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;
}
當我運行此代碼時,我收到此OpenCV錯誤:
OpenCV Error: Assertion failed ((img.depth() == CV_8U || img.depth() == CV_32F)
&& img.type() == templ.type()) in ...
誰能幫助我解決這個問題?
謝謝
我解決了我的問題。 我需要將模板的顏色從BGR轉換為RGBA。 使用以下代碼,我不再崩潰,但是預覽中的相機幀非常慢。 這不是我想要的。
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;
}
該錯誤表明模板和src在通道和大小方面不兼容。
// Do the Matching and Normalize
Imgproc.matchTemplate(src, templ, result, match_method);
您確定應該為temp1
嗎? 看來您已進行了大量轉換為template
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.