使用 EncodeToJPG（在 OpenVR 中）将 Texture2D 转换为 Byte[]

Question

我有一个问题！

我只想，只是...使用 EncodeToJPG()[= 将 Texture2D 转换为 Byte[] 42=]函数！

我的工作区是 Unity 和 C# Script，+ OpenCvSharp。

也许你觉得这很容易，但它有一些问题。

此脚本使用 OpenVR(HTC VIVE)。

无论如何，这是我的来源。

var source = SteamVR_TrackedCamera.Source(undistorted); //Receive texture data from VR. texture = source.texture; //Debug.Log(source.texture.width + "/" + source.texture.height); //size : 612 /460 if (texture == null) { return; } //Input texture data into material, and it's in unity (quad GameObject). //this G.O print display like camera material.mainTexture = texture; //here is my src, I want to save Image but texture.EncodeToJPG has some error. Cv2.ImShow("_Texture ...", Mat.FromImageData(texture.EncodeToJPG())); Cv2.ImWrite(SavePath+ "Image.jpg", Mat.FromImageData(texture.EncodeToJPG()));

而且...有问题。变量texture是异常的Texture2D类型。

if (_texture == null) { _texture = Texture2D.CreateExternalTexture((int)header.nWidth, (int)header.nHeight, TextureFormat.RGBA32, false, false, nativeTex); //_texture = new Texture2D(612, 460, TextureFormat.RGBA32, false); uint width = 0, height = 0; var frameBounds = new VRTextureBounds_t(); if (trackedCamera.GetVideoStreamTextureSize(deviceIndex, frameType, ref frameBounds, ref width, ref height) == EVRTrackedCameraError.None) { // Account for textures being upside-down in Unity. frameBounds.vMin = 1.0f - frameBounds.vMin; frameBounds.vMax = 1.0f - frameBounds.vMax; this.frameBounds = frameBounds; } } else { _texture.UpdateExternalTexture(nativeTex); //_texture.Apply(); }

_texture 是由函数 CreateExternalTexture 创建的，它具有名为 nativeTex[=42= 的 Intptr 类型参数].

不知道怎么办？

+++编辑！错误显示+++

Answer 1

由于 Unity 可能无法直接访问外部纹理，我建议先执行 Graphics.Blit() 以通过 GPU 将该纹理传输到 RenderTexture。

在 RenderTexture 中拥有纹理后，您需要再跳一个圈，并将像素从 RenderTexture.active 读取到另一个标准、基于 RAM 的 Texture2D，然后您应该能够对其进行编码。

记得在执行 ReadPixels() 后应用() 纹理

Answer 2

声明了这个函数：

private Texture2D ReadExternalTexture(Texture externalTexture)
{
    Texture2D myTexture2D = new Texture2D(texture.width, texture.height);
    //myTexture2D => empty Texture2D type variable
    if (myTexture2D == null)
    {
        Debug.Log("var: myTexture2D is null state.");
        myTexture2D = new Texture2D(texture.width, texture.height);
    }

    //Make RenderTexture type variable
    RenderTexture tmp = RenderTexture.GetTemporary(
    externalTexture.width,
    externalTexture.height,
    0,
    RenderTextureFormat.ARGB32,
    RenderTextureReadWrite.sRGB);

    Graphics.Blit(externalTexture, tmp);
    RenderTexture previous = RenderTexture.active;
    RenderTexture.active = tmp;

    myTexture2D.ReadPixels(new UnityEngine.Rect(0, 0, tmp.width, tmp.height), 0,     0);
    myTexture2D.Apply();

    RenderTexture.active = previous;
    RenderTexture.ReleaseTemporary(tmp);

    return myTexture2D;
}

并在 void Update() 中使用 ReadExternalTexture 函数：

_texture = ReadExternalTexture(material.mainTexture);

Mat mat = Mat.FromImageData(_texture.EncodeToPNG());

Cv2.Flip(mat, mat, 0);
//Flip(src, dest, 0->updown flip / 1->leftright flip)

Cv2.Resize(mat, mat, new Size(224, 224));

Cv2.ImShow("Image", mat);
//Cv2.ImWrite(SavePath + "Image.jpg", mat);

这完全有效！

使用 EncodeToJPG（在 OpenVR 中）将 Texture2D 转换为 Byte[]

Convert Texture2D to Byte[] using EncodeToJPG (in OpenVR)

c#

unity3d

texture2d

opencvsharp

openvr