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source: data/trunk/programs/LaplaceFP.cg @ 10577

Last change on this file since 10577 was 7708, checked in by dafrick, 14 years ago

Merging cleanup branch. You will need to update your data repository as well as your local copy of the code.

  • Property svn:eol-style set to native
File size: 800 bytes
Line 
1sampler Image : register(s0);
2
3// The Laplace filter approximates the second order derivate,
4// that is, the rate of change of slope in the image. It can be
5// used for edge detection. The Laplace filter gives negative
6// response on the higher side of the edge and positive response
7// on the lower side.
8
9// This is the filter kernel:
10// 0  1  0
11// 1 -4  1
12// 0  1  0
13
14
15
16float4 Laplace_ps (float2 texCoord: TEXCOORD0,
17                        uniform float scale,
18                        uniform float pixelSize) : COLOR
19{
20
21    float2 samples[4] = {
22        0, -1,
23       -1,  0,
24        1,  0,
25        0,  1
26    };
27   float4 laplace = -4 * tex2D(Image, texCoord);
28
29   // Sample the neighbor pixels
30   for (int i = 0; i < 4; i++){
31      laplace += tex2D(Image, texCoord + pixelSize * samples[i]);
32   }
33
34   return (0.5 + scale * laplace);
35}
36
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