OpenGL + Kinect SDK - 如何从单个像素获取深度值?

OpenGL + Kinect SDK - how to get depth value from a single pixel?

我们目前正在使用 Kinect 跟踪 window 中的对象,现在我们需要获取 3D 而不是“2D”坐标。基本上我们需要单点LockedRect.pBits得到的深度值

我们当前的代码returns任意0之类的,但这里是:

void getDepthData(GLubyte* dest) {


    NUI_IMAGE_FRAME imageFrame;
    NUI_LOCKED_RECT LockedRect;
    if (sensor->NuiImageStreamGetNextFrame(depthStream, 0, &imageFrame) < 0) return;
    INuiFrameTexture* texture = imageFrame.pFrameTexture;
    texture->LockRect(0, &LockedRect, NULL, 0);
    if (LockedRect.Pitch != 0) {
            const USHORT* curr = (const USHORT*)LockedRect.pBits;
            cout << curr;
            const USHORT* dataEnd = curr + (width*height);

            while (curr < dataEnd) {
                    // Get depth in millimeters
                    USHORT depth = NuiDepthPixelToDepth(*curr++);

                    // Draw a grayscale image of the depth:
                    // B,G,R are all set to depth%256, alpha set to 1.
                    for (int i = 0; i < 3; ++i)
                            *dest++ = (BYTE)depth % 256;
                    *dest++ = 0xff;
            }

    }
    texture->UnlockRect(0);
    sensor->NuiImageStreamReleaseFrame(depthStream, &imageFrame);

}

我们找到了解决办法!对于任何想知道同样事情的人; pBits 是 USHORT 格式中的最小值,你想找到它之后的第 x 个像素。在矩阵中描绘它,你想找到深度,例如。在 5*4 矩阵中 pBits 的下方 2 行和右侧 3 列,使您 pBits + 2 * width + 3 = pBits 之后的第 13 位(在纸上可视化有助于此)。

void getDepthData(RotatedRect trackBox, GLubyte* dest) {

NUI_IMAGE_FRAME imageFrame;
NUI_LOCKED_RECT LockedRect;
if (sensor->NuiImageStreamGetNextFrame(depthStream, 0, &imageFrame) < 0) return;
INuiFrameTexture* texture = imageFrame.pFrameTexture;
texture->LockRect(0, &LockedRect, NULL, 0);
if (LockedRect.Pitch != 0) {
    USHORT* curr = (USHORT*)(LockedRect.pBits);
    curr = curr + (USHORT)trackBox.center.y * width + (USHORT)trackBox.center.x;

        // Get depth in millimeters
        USHORT depth = NuiDepthPixelToDepth(*curr);

        cout << depth << "\n";

}
texture->UnlockRect(0);
sensor->NuiImageStreamReleaseFrame(depthStream, &imageFrame); 

除了我们确实为 1*width+1 差异提供了漂亮的代码,这在 40+ 厘米的距离下不是问题。