Color image in Sobel filter example from CUDA SDK how to apply sobel filter in the example to color

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi everyone,

I’m trying to figure out the code in the Sobel filter example from CUDA SDK. But I have a problem when I try to apply the code to color image (lena.ppm).

[codebox]void loadDefaultImage( char* loc_exec) {

…

const char* image_filename = "<b>lena.ppm</b>";

…

}[/codebox]

I think the program has already provided a way to solve with color image, but when I run the program I got the result below

Hope to see your help,

Thank you very much External Image

2

There is a comment at the beginning of the code which says:

//

// Cuda example code that implements the Sobel edge detection

// filter. This code works for 8-bit monochrome images.

//

So I guess you can safely assume it won’t work without modification for colour images.

3

part of the difficulty is the call to glTexImage2D doing
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imWidth, imHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gets rid of the white screen (and replaces it with a grayscale image). a start…