OpenCVForUnity边缘检测（梯度）与滤波

public class gradient : MonoBehaviour
{
[SerializeField] private Image sobelImage, laplaceImage, cannyImage;
Mat grayMat = new Mat();
Mat dstMat = new Mat();

void Start()
{
grayMat = Imgcodecs.imread(Application.dataPath + "/Textures/kizuna.jpg", 0); //读取为灰度

sobelImage.sprite = SobelGradient();
sobelImage.preserveAspect = true;

laplaceImage.sprite = LaplaceGradient();
laplaceImage.preserveAspect = true;

cannyImage.sprite = CannyGradient();
cannyImage.preserveAspect = true;
}

//索贝尔滤波
public Sprite SobelGradient()
{
Mat grad_x = new Mat();
Mat grad_y = new Mat();
Mat abs_grad_x = new Mat();
Mat abs_grad_y = new Mat();

// 计算水平方向梯度
Imgproc.Sobel(grayMat, grad_x, CvType.CV_16S, 1, 0, 3, 1, 0);
// 计算垂直方向梯度
Imgproc.Sobel(grayMat, grad_y, CvType.CV_16S, 0, 1, 3, 1, 0);
// 计算两个方向上的梯度的绝对值
Core.convertScaleAbs(grad_x, abs_grad_x);
Core.convertScaleAbs(grad_y, abs_grad_y);
// 计算结果梯度
Core.addWeighted(abs_grad_x, 0.5, abs_grad_y, 0.5, 1, dstMat);

// Mat转Texture2D
Texture2D t2d = new Texture2D(dstMat.cols(), dstMat.rows());
Utils.matToTexture2D(dstMat, t2d);
Sprite sp = Sprite.Create(t2d, new UnityEngine.Rect(0, 0, t2d.width, t2d.height), Vector2.zero);
return sp;
}

//拉普拉斯滤波
public Sprite LaplaceGradient()
{
Mat dst = new Mat();
int scale = 1;
int delta = 0;
int ddepth = CvType.CV_16S;
int kernel_size = 3;

Imgproc.Laplacian(grayMat, dst, ddepth, kernel_size, scale, delta, Core.BORDER_DEFAULT);
Core.convertScaleAbs(dst, dstMat);

// Mat转Texture2D
Texture2D t2d = new Texture2D(dstMat.cols(), dstMat.rows());
Utils.matToTexture2D(dstMat, t2d);
Sprite sp = Sprite.Create(t2d, new UnityEngine.Rect(0, 0, t2d.width, t2d.height), Vector2.zero);
return sp;
}

//Canny滤波
public Sprite CannyGradient()
{
Mat edge = new Mat();
double threshold1 = 0;
double threshold2 = 100;

Imgproc.blur(grayMat, edge, new Size(3, 3));
Imgproc.Canny(edge, edge, threshold1, threshold2);
Core.convertScaleAbs(edge, dstMat);

// Mat转Texture2D
Texture2D t2d = new Texture2D(dstMat.cols(), dstMat.rows());
Utils.matToTexture2D(dstMat, t2d);
Sprite sp = Sprite.Create(t2d, new UnityEngine.Rect(0, 0, t2d.width, t2d.height), Vector2.zero);
return sp;
}
}

最终效果