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我剛剛學會如何檢測OpenCV Java, Getting region of interest from image中的顏色。Android OpenCV:顏色檢測給出奇怪的結果
最後,我想知道我怎麼可以檢測節AA電池(有或沒有黑膠帶)
現在我嘗試偵測畫面中的電池,但電池不完全黑色,反過來給我怪異的結果:
我所涵蓋的電池用黑色膠帶,並試圖再次結果似乎更好,但它被檢測兩個獨立部分電池:
代碼:
private Bitmap findRoiBlack(Bitmap sourceBitmap) {
Bitmap roiBitmap = null;
Scalar green = new Scalar(0, 255, 0, 255);
Mat sourceMat = new Mat(sourceBitmap.getWidth(), sourceBitmap.getHeight(), CvType.CV_8UC3);
Utils.bitmapToMat(sourceBitmap, sourceMat);
Mat roiTmp = sourceMat.clone();
final Mat hsvMat = new Mat();
sourceMat.copyTo(hsvMat);
// convert mat to HSV format for Core.inRange()
Imgproc.cvtColor(hsvMat, hsvMat, Imgproc.COLOR_RGB2HSV);
Scalar lowerb = new Scalar(0, 0, 0); // lower color border for BLACK
Scalar upperb = new Scalar(180, 255, 30); // upper color border for BLACK
//Scalar lowerb = new Scalar(0, 0, 200); // lower color border for WHITE
//Scalar upperb = new Scalar(180, 255, 255); // upper color border for WHITE
Core.inRange(hsvMat, lowerb, upperb, roiTmp); // select only blue pixels
// find contours
List<MatOfPoint> contours = new ArrayList<>();
List<RotatedRect> boundingRects = new ArrayList<>();
Imgproc.findContours(roiTmp, contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);
// find appropriate bounding rectangles
for (MatOfPoint contour : contours) {
MatOfPoint2f areaPoints = new MatOfPoint2f(contour.toArray());
RotatedRect boundingRect = Imgproc.minAreaRect(areaPoints);
double rectangleArea = boundingRect.size.area();
// test min ROI area in pixels
if (rectangleArea > 400) {
Point rotated_rect_points[] = new Point[4];
boundingRect.points(rotated_rect_points);
Rect rect = Imgproc.boundingRect(new MatOfPoint(rotated_rect_points));
// test vertical ROI orientation
if (rect.height > rect.width) {
Imgproc.rectangle(sourceMat, rect.tl(), rect.br(), green, 3);
}
}
}
roiBitmap = Bitmap.createBitmap(sourceMat.cols(), sourceMat.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(sourceMat, roiBitmap);
return roiBitmap;
}