从Kinect深度流获取像素颜色

Question

我目前在尝试从Kinect Depth Stream中找到特定像素的颜色时遇到了一些困难。下面的代码是我用来计算(100,100)像素颜色的代码。

我有一种感觉，我的逻辑在什么地方有缺陷(可能是在将索引计算到我想要的colorPixels中时)

colorPixels和depthPixels声明如下：

colorFrame.CopyPixelDataTo(colorPixels); //colorPixels is a byte[]
depthFrame.CopyDepthImagePixelDataTo(depthPixels); //depthPixels is a DepthImagePixel[]

我计算深度流中100,100像素的rgb值，如下所示：

DepthImagePoint ballDepthPoint = new DepthImagePoint();
int ballPosX = 100;
int ballPosY = 100;
int blueTotal = 0, greenTotal = 0, redTotal = 0;

ColorImagePoint ballColorPoint;

//build a depth point to translate to a color point
ballDepthPoint.X = ballPosX;
ballDepthPoint.Y = ballPosY;
ballDepthPoint.Depth = this.depthPixels[ballDepthPoint.X * ballDepthPoint.Y].Depth;

//work out the point on the color image from this depth point
ballColorPoint = this.sensor.CoordinateMapper.MapDepthPointToColorPoint(this.sensor.DepthStream.Format, ballDepthPoint, this.sensor.ColorStream.Format);

//extract the rgb values form the color pixels array
blueTotal += (int)colorPixels[(ballColorPoint.X * ballColorPoint.Y * colorFrame.BytesPerPixel)];
greenTotal += (int)colorPixels[(ballColorPoint.X * ballColorPoint.Y * colorFrame.BytesPerPixel) + 1];
redTotal += (int)colorPixels[(ballColorPoint.X * ballColorPoint.Y * colorFrame.BytesPerPixel) + 2];

System.Console.WriteLine("The ball found is " + redTotal + "," + blueTotal + "," + greenTotal + " which is " + Helper.ColorChooser(redTotal, greenTotal, blueTotal)); 

ColorChooser方法如下：

public static String ColorChooser(int r, int g, int b)
    {

        if (r >= g && r >= b)
        {
            return "RED";
        }
        else if (b >= g && b >= r)
        {
            return "BLUE";
        }
        else
            return "GREEN";
    }

如果您需要更多信息/代码，请让我知道。

非常感谢，

戴夫McB

Answer 1

最后，对彩色像素中的像素进行索引的正确方法似乎是：

colorPixels[(ballColorPoint.X * colorFrame.BytesPerPixel) + (ballColorPoint.Y * stride)];

其中：

int stride = colorFrame.BytesPerPixel * colorFrame.Width;