我正在尝试将RAW16图像文件显示为简单的WindowsForm.PictureBox
。这是我的代码:
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
private void btnSelect_Click(object sender, EventArgs e)
{
if (dlgPicture.ShowDialog() == DialogResult.OK)
txtPicture.Text = dlgPicture.FileName;
}
private void btnLoad_Click(object sender, EventArgs e)
{
if (System.IO.File.Exists(txtPicture.Text))
{
byte[] _data = System.IO.File.ReadAllBytes(txtPicture.Text);
Bitmap _bmp = new Bitmap(160, 120, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale);
Rectangle _rect = new Rectangle(0, 0, 160, 120);
BitmapData _bmpData = _bmp.LockBits(_rect, ImageLockMode.WriteOnly, _bmp.PixelFormat);
short[] _rawdata = new short[19200];
for (int x = 0; x < 160; x++)
{
for (int y = 0; y < 120; y++)
{
short _word;
int index;
index = (y*160)+x;
_word = (short)(_data[index]<<8 + _data[index+1]);
_rawdata[index] = _word;
}
}
var _ptr = _bmpData.Scan0;
Marshal.Copy(_rawdata, 0, _ptr, _rawdata.Length);
_bmp.UnlockBits(_bmpData);
pbFrame.Image = _bmp;
}
}
当我选择RAW16灰度图像时,结果是System.ArgumentException: Invalid parameter
。
示例图片文件在这里:Example RAW16 picture file
修改SamAxe建议的链接中提供的代码,我这样写:
private void btnLoad_Click(object sender, EventArgs e)
{
if (System.IO.File.Exists(txtPicture.Text))
{
byte[] _data = System.IO.File.ReadAllBytes(txtPicture.Text);
var _rgbData = Convert16BitGrayScaleToRgb16(_data, 160, 120);
var _bmp = CreateBitmapFromBytes(_rgbData, 160, 120);
pbFrame.Image = _bmp;
}
}
private static void Convert16bitGSToRGB(UInt16 color, out byte red, out byte green, out byte blue)
{
red = (byte)(color & 0x31);
green = (byte)((color & 0x7E0) >> 5);
blue = (byte)((color & 0xF800) >> 11);
}
private static byte[] Convert16BitGrayScaleToRgb48(byte[] inBuffer, int width, int height)
{
int inBytesPerPixel = 2;
int outBytesPerPixel = 6;
byte[] outBuffer = new byte[width * height * outBytesPerPixel];
int inStride = width * inBytesPerPixel;
int outStride = width * outBytesPerPixel;
// Step through the image by row
for (int y = 0; y < height; y++)
{
// Step through the image by column
for (int x = 0; x < width; x++)
{
// Get inbuffer index and outbuffer index
int inIndex = (y * inStride) + (x * inBytesPerPixel);
int outIndex = (y * outStride) + (x * outBytesPerPixel);
byte hibyte = inBuffer[inIndex + 1];
byte lobyte = inBuffer[inIndex];
//R
outBuffer[outIndex] = lobyte;
outBuffer[outIndex + 1] = hibyte;
//G
outBuffer[outIndex + 2] = lobyte;
outBuffer[outIndex + 3] = hibyte;
//B
outBuffer[outIndex + 4] = lobyte;
outBuffer[outIndex + 5] = hibyte;
}
}
return outBuffer;
}
private static byte[] Convert16BitGrayScaleToRgb16(byte[] inBuffer, int width, int height)
{
int inBytesPerPixel = 2;
int outBytesPerPixel = 2;
byte[] outBuffer = new byte[width * height * outBytesPerPixel];
int inStride = width * inBytesPerPixel;
int outStride = width * outBytesPerPixel;
// Step through the image by row
for (int y = 0; y < height; y++)
{
// Step through the image by column
for (int x = 0; x < width; x++)
{
// Get inbuffer index and outbuffer index
int inIndex = (y * inStride) + (x * inBytesPerPixel);
int outIndex = (y * outStride) + (x * outBytesPerPixel);
byte hibyte = inBuffer[inIndex];
byte lobyte = inBuffer[inIndex+1];
outBuffer[outIndex] = lobyte;
outBuffer[outIndex+1] = hibyte;
}
}
return outBuffer;
}
private static byte[] Convert16BitGrayScaleToRgb24(byte[] inBuffer, int width, int height)
{
int inBytesPerPixel = 2;
int outBytesPerPixel = 3;
byte[] outBuffer = new byte[width * height * outBytesPerPixel];
int inStride = width * inBytesPerPixel;
int outStride = width * outBytesPerPixel;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int inIndex = (y * inStride) + (x * inBytesPerPixel);
int outIndex = (y * outStride) + (x * outBytesPerPixel);
byte hibyte = inBuffer[inIndex];
byte lobyte = inBuffer[inIndex + 1];
byte r, g, b;
UInt16 color = (UInt16)(hibyte << 8 | lobyte);
Convert16bitGSToRGB(color, out r, out g, out b);
outBuffer[outIndex] = r;
outBuffer[outIndex + 1] = g;
outBuffer[outIndex + 2] = b;
}
}
return outBuffer;
}
private static Bitmap CreateBitmapFromBytes(byte[] pixelValues, int width, int height)
{
//Create an image that will hold the image data
Bitmap bmp = new Bitmap(width, height, PixelFormat.Format16bppRgb565);
//Get a reference to the images pixel data
Rectangle dimension = new Rectangle(0, 0, bmp.Width, bmp.Height);
BitmapData picData = bmp.LockBits(dimension, ImageLockMode.ReadWrite, bmp.PixelFormat);
IntPtr pixelStartAddress = picData.Scan0;
//Copy the pixel data into the bitmap structure
Marshal.Copy(pixelValues, 0, pixelStartAddress, pixelValues.Length);
bmp.UnlockBits(picData);
return bmp;
}
但是结果仍然不令人满意。这是我应该得到的图片:
这是使用Convert16BitGrayScaleToRgb48
的结果:
这是使用Convert16BitGrayScaleToRgb16
的结果: