玩转Android OpenCV（23）：理解并应用Sobel算子进行边缘识别
最编程
2024-02-06 22:27:16
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/**
* Sobel算子-边缘检测
*
* @author yidong
* @date 2020-01-07
*/
class SobelEdgeDetectionActivity : AppCompatActivity() {
private lateinit var mBinding: ActivityEdgeDetectionBinding
private lateinit var mRgb: Mat
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mBinding = DataBindingUtil.setContentView(this, R.layout.activity_edge_detection)
val bgr = Utils.loadResource(this, R.drawable.lena)
mRgb = Mat()
Imgproc.cvtColor(bgr, mRgb, Imgproc.COLOR_BGR2RGB)
showMat(mBinding.ivLena, mRgb)
}
private fun showMat(view: ImageView, source: Mat) {
val bitmap = Bitmap.createBitmap(source.width(), source.height(), Bitmap.Config.ARGB_8888)
bitmap.density = 360
Utils.matToBitmap(source, bitmap)
view.setImageBitmap(bitmap)
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.menu_sobel, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.sobel_edge_detection_x -> {
edgeDetectionX()
}
R.id.sobel_edge_detection_y -> {
edgeDetectionY()
}
R.id.sobel_edge_detection_x_y -> {
edgeDetectionXAndY()
}
}
return true
}
private fun edgeDetectionX() {
title = "X轴方向边缘检测"
val resultX = Mat()
Imgproc.Sobel(mRgb, resultX, CvType.CV_16S, 2, 0, 1)
Core.convertScaleAbs(resultX, resultX)
showMat(mBinding.ivResult, resultX)
}
private fun edgeDetectionY() {
title = "Y轴方向边缘检测"
val resultY = Mat()
Imgproc.Sobel(mRgb, resultY, CvType.CV_16S, 0, 1, 3)
Core.convertScaleAbs(resultY, resultY)
showMat(mBinding.ivResult, resultY)
}
private fun edgeDetectionXAndY() {
title = "X和Y轴方向边缘检测"
val resultX = Mat()
Imgproc.Sobel(mRgb, resultX, CvType.CV_16S, 2, 0, 1)
Core.convertScaleAbs(resultX, resultX)
showMat(mBinding.ivResult, resultX)
val resultY = Mat()
Imgproc.Sobel(mRgb, resultY, CvType.CV_16S, 0, 1, 3)
Core.convertScaleAbs(resultY, resultY)
showMat(mBinding.ivResult, resultY)
val resultXY = Mat()
Core.add(resultX, resultY, resultXY)
showMat(mBinding.ivResult, resultXY)
resultX.release()
resultY.release()
resultXY.release()
}
}
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