使用opencv利用c#在unity里实现最邻近差值调整图像大小代码

在 Unity 中使用 C# 和 OpenCV 来实现最邻近差值调整图像大小的代码可以参考以下示例：

using UnityEngine;
using OpenCvSharp;

public class ImageResizer : MonoBehaviour
{
    public Texture2D inputTexture;
    public int outputWidth = 512;
    public int outputHeight = 512;

    private Texture2D outputTexture;

    void Start()
    {
        // 将输入的 Unity 纹理转换为 OpenCV 图像
        Mat inputImage = UnityTextureToMat(inputTexture);

        // 调整图像大小
        Mat resizedImage = new Mat();
        Cv2.Resize(inputImage, resizedImage, new Size(outputWidth, outputHeight), 0, 0, InterpolationFlags.Nearest);

        // 将调整后的图像转换为 Unity 纹理
        outputTexture = MatToUnityTexture(resizedImage);

        // 将调整后的图像显示在屏幕上
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = outputTexture;
    }

    private Mat UnityTextureToMat(Texture2D texture)
    {
        Mat mat = new Mat(texture.height, texture.width, MatType.CV_8UC3);

        Color32[] colors = texture.GetPixels32();
        byte[] data = new byte[texture.width * texture.height * 3];

        int index = 0;
        for (int y = 0; y < texture.height; y++)
        {
            for (int x = 0; x < texture.width; x++)
            {
                Color32 color = colors[y * texture.width + x];
                data[index++] = color.r;
                data[index++] = color.g;
                data[index++] = color.b;
            }
        }

        mat.SetArray(0, 0, data);

        return mat;
    }

    private Texture2D MatToUnityTexture(Mat mat)
    {
        Texture2D texture = new Texture2D(mat.Cols, mat.Rows, TextureFormat.RGB24, false);

        byte[] data = new byte[mat.Cols * mat.Rows * 3];
        mat.GetArray(0, 0, data);

        Color32[] colors = new Color32[mat.Cols * mat.Rows];
        int index = 0;
        for (int y = 0; y < mat.Rows; y++)
        {
            for (int x = 0; x < mat.Cols; x++)
            {
                colors[index++] = new Color32(data[index], data[index + 1], data[index + 2], 255);
                index += 3;
            }
        }

        texture.SetPixels32(colors);
        texture.Apply();

        return texture;
    }
}

以上代码会将输入的纹理 `inputTexture` 调整为指定的大小 `outputWidth` 和 `outputHeight`，并在 Unity 中显示调整后的图像。注意，需要在 Unity 中安装并引用 OpenCvSharp 库。