字节[]为灰度的BitmapImage [英] byte[] to gray scale BitmapImage

问题描述

我开始了一个128×128阵列双打，并把它转换成与每个双比例值字节的一维数组。

I start out with a 128 x 128 array of doubles and turn that into a 1D array of bytes with proportional values for each double.

然后我把这个数组字节并把它变成一个内存流（数据流以下），并尝试并将它放入一个的BitmapImage ，如下所示：

I then take this array of bytes and turn it into a memory stream (dataStream below) and try and put that into a BitmapImage like so:

imgScan.Width = 128;
imgScan.Height = 128;
BitmapImage bi = new BitmapImage();
bi.SourceRect = new Int32Rect(0, 0, width, height);
bi.StreamSource = dataStream;
imgScan.Source = bi;

下面 imgScan 是 System.Windows.Controls.Image

这不会产生预期的图像（我只是得到一个白色方块）。

This doesn't produce the expected image (I just get a white square).

我应该如何去这件事？

推荐答案

我觉得你会发现，在你的代码，流应该包含一个完整的图像文件，数据不是一个原始块。下面是从数据块制作的位图（它不是灰度图，但你可能会得到的想法）：

I think you'll find that in your code, the stream should contain a complete image file, not a raw block of data. Here's making a Bitmap from a block of data (it's not greyscale, but you might get the idea):

const int bytesPerPixel = 4;
int stride = bytesPerPixel * pixelsPerLine;
UInt32[] pixelBytes = new uint[lineCount * pixelsPerLine];

for (int y = 0; y < lineCount; y++)
{
    int destinationLineStart = y * pixelsPerLine;
    int sourceLineStart = y * pixelsPerLine;
    for (int x = 0; x < pixelsPerLine; x++)
    {
        pixelBytes[x] = _rgbPixels[x].Pbgr32;
    }
}
var bmp = BitmapSource.Create(pixelsPerLine, lineCount, 96, 96, PixelFormats.Pbgra32, null, pixelBytes, stride);
bmp.Freeze();
return bmp;

您已经做了位在嵌套循环（使字节数组），但我离开它所以你可以看到之前创建

You've already done the bit in the nested loops (making the byte array), but I left it in so you can see what comes before the Create

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