Question

我正在尝试在Kinect v2中获取每个CameraSpacePoint的RGB值。我能够获得CameraSpacePoints和Color像素。但似乎从我的代码中破坏了从CameraSpacePoints到Color像素的映射，这导致我转向IndexOutOfRangeException。

请参阅下面显示数据收集部分的代码段：

var depthWidth = depthFrame.FrameDescription.Width;
var depthHeight = depthFrame.FrameDescription.Height;
ushort[] depthData = new ushort[depthWidth * depthHeight];

var colorWidth = colorFrame.FrameDescription.Width;
var colorHeight = colorFrame.FrameDescription.Height;
byte[] pixels = new byte[colorWidth * colorHeight * 4];

CameraSpacePoint[] cameraSpacePoints = new CameraSpacePoint[depthData.Length];
ColorSpacePoint[] colorSpacePoints = new ColorSpacePoint[depthData.Length];

depthFrame.CopyFrameDataToArray(depthData);
coordinateMapper.MapDepthFrameToCameraSpace(depthData, cameraSpacePoints);
coordinateMapper.MapDepthFrameToColorSpace(depthData, colorSpacePoints);

// Assuming RGBA format here
colorFrame.CopyConvertedFrameDataToArray(pixels, ColorImageFormat.Rgba);

请参阅下面的代码，显示ColorSpacePoints的RGB值：

for (var index = 0; index < depthData.Length; index++)
{
    var u = colorSpacePoints[index].X;
    var v = colorSpacePoints[index].Y;
    int pixelsBaseIndex = (int)(v * depthWidth + u);

    byte red   = pixels[4 * pixelsBaseIndex + 0];
    byte green = pixels[4 * pixelsBaseIndex + 1];
    byte blue  = pixels[4 * pixelsBaseIndex + 2];
    byte alpha = pixels[4 * pixelsBaseIndex + 3];
}

上面的代码段引发了以下错误：

IndexOutOfRangeException: Index was outside the bounds of the array.

为了调试问题，我监控了每个索引，然后计算了最小和最大索引值，如下所示：

List<int> allIndex = new List<int>();
for (var index = 0; index < depthData.Length; index++)
{
    var u = colorpoints[index].X;
    var v = colorpoints[index].Y;
    int pixelsBaseIndex = (int)(v * depthWidth + u);

    allIndex.Add(pixelsBaseIndex);
}

var maxIndex = allIndex.Max();
var minIndex = allIndex.Min();
Console.WriteLine(minIndex);//Prints -2147483648
Console.WriteLine((maxIndex < pixels.Length) && (minIndex >= 0));//Prints False

令人惊讶的是，最低指数为-2147483648。有什么猜测？我错过了一些明显的东西吗？

Answer 1

   for (var index = 0; index < depthData.Length; index++) {
     int u = (int) Math.Floor(colorPoints[index].X);
     int v = (int) Math.Floor(colorPoints[index].Y);

     /*
     1. not every depth pixel has a corresponding color pixel.
        So always check whether u,v are valid or not
     */
     if ((0 <= u) && (u < colorWidth) && (0 <= v) && (v < colorHeight)) {

      /*
      2. now u,v are pixel coordinates in colorspace,
         so to get the index of the corresponding pixel,
         you need to multiply v by colorWidth instead of depthwidth
       */
      int pixelsBaseIndex = v * colorWidth + u;

      byte red = pixels[4 * pixelsBaseIndex + 0];
      byte green = pixels[4 * pixelsBaseIndex + 1];
      byte blue = pixels[4 * pixelsBaseIndex + 2];
      byte alpha = pixels[4 * pixelsBaseIndex + 3];
     }


   }

如果您需要更多参考，请检查以下内容，这是C ++中另一种注册实现。但你可以理解这个概念。

Kinect Registration

令人惊讶的是，最低指数为-2147483648。有什么猜测吗？

如果检查原始深度帧的值，您会发现一些无效的深度值。 Kinect v2的深度范围为0.5m至4.5m。超出此范围的所有对象都会导致深度值无效。这些值导致-2147483648。您可以预处理这些无效值，也可以忽略它们。

Answer 2

试试这个

     bool flag = true;

   for (int i = 1; (i <= ((depthData.Length)- 1)) && flag; i++)
        {
            flag = false;
            for (int j = 0; j < ((depthData.Length)- 1); j++)
            {
            //You Statements Goes here
            flag = true;

            }

索引超出了Kinect v2中数组的范围

2 个答案: