public unsafe ImageU8 ToImageU8()
{
ImageU8 img = new ImageU8(this.Width, this.Height);
Grad * start = this.Start;
Grad * end = start + this.Length;
float max = 0;
// 找最大值
Grad *src = start;
while (src != end)
{
max = Math.Max(max, src->Value);
src++;
}
float coeff = max > 255 ? 255f / max : 0;
src = start;
Byte *dst = img.Start;
while (src != end)
{
*dst = (Byte)(coeff * src->Value);
dst++;
src++;
}
return(img);
}
public unsafe ImageGrad CreateGradImage(Boolean computeDirection = true)
{
int step = this.Step;
using (ImageChannel32 gradX = new ImageChannel32(this.Width, this.Height))
using (ImageChannel32 gradY = new ImageChannel32(this.Width, this.Height))
{
CopyToIntChannel(this, gradX);
CopyToIntChannel(this, gradY);
gradX.ApplyConvolution(ConvolutionKernel.SobelX);
gradY.ApplyConvolution(ConvolutionKernel.SobelY);
ImageGrad grad = new ImageGrad(this.Width, this.Height);
Int32 * xStart = (Int32 *)gradX.StartIntPtr;
Int32 * yStart = (Int32 *)gradY.StartIntPtr;
Grad * g = grad.Start;
Grad * gEnd = g + grad.Length;
if (computeDirection == true)
{
while (g != gEnd)
{
Int32 x = *xStart;
Int32 y = *yStart;
float f = (float)Math.Sqrt(x * x + y * y);
float theta = (float)Math.Atan2(x, y);
g->Value = f;
g->Theta = theta;
xStart++;
yStart++;
g++;
}
}
else
{
while (g != gEnd)
{
Int32 x = *xStart;
Int32 y = *yStart;
float f = (float)Math.Sqrt(x * x + y * y);
g->Value = f;
g->Theta = 0;
xStart++;
yStart++;
g++;
}
}
return(grad);
}
}