记下来不用找
Opencv资源https://download.csdn.net/download/qq_37324563/89729678
版本可能比较老,凑合用吧
mBinding.cameraview.setCvCameraViewListener(object : CameraBridgeViewBase.CvCameraViewListener2 {/*** 当摄像机预览开始时,这个方法就会被调用。在调用该方法之后,框架将通过onCameraFrame()回调向客户端发送。** @param width - 帧的宽度* @param height - 帧的高度*/override fun onCameraViewStarted(width: Int, height: Int) {//定义Mat对象rgba = Mat(width, height, CvType.CV_8UC4)}/*** 当摄像机预览由于某种原因被停止时,这个方法就会被调用。*在调用这个方法之后,不会通过onCameraFrame()回调来传递任何帧。*/override fun onCameraViewStopped() {}/*** 当需要完成框架的交付时,将调用此方法。*返回值-是一个修改后的帧,需要在屏幕上显示。* @param inputFrame*/override fun onCameraFrame(inputFrame: CameraBridgeViewBase.CvCameraViewFrame): Mat? {val input = inputFrame.gray()val circles = Mat()Imgproc.blur(input, input, Size(7.0, 7.0), Point(2.0, 2.0))Imgproc.HoughCircles(input, circles, Imgproc.CV_HOUGH_GRADIENT, 2.0, 100.0, 100.0, 90.0, 0, 1000)if (circles.cols() > 0) {var maxRadius = 0var maxIndex = 0for (x in 0 until circles.cols()) {val circleVec = circles[0, x]val radius = circleVec[2].toInt()if (radius > maxRadius) {maxRadius = radiusmaxIndex = x}}val center = Point(circles[0, maxIndex][0].toInt().toDouble(), circles[0, maxIndex][1].toInt().toDouble())// Imgproc.circle(input, center, 3, Scalar(255.0, 255.0, 255.0), 5)Imgproc.circle(input, center, maxRadius, Scalar(255.0, 0.0, 0.0), 2) // 使用不同的颜色突出显示最大半径的圆}circles.release()input.release()return inputFrame.rgba()}})