[im-users] How to create image using my own data

[Antonio Scuri]

   I'm sorry but your message got stuck in LuaForge message system and only 
arrived during this weekend. The LuaForge guys just fixed a bug and flush 
held messages.

   Yes, you can use imImageInit to do that. But this functions was made to 
allocate an imImage structure for already allocated image memory.

   If you need also to allocate the memory, then you could simply use 
imImageCreate.

   A Kernel is simply another image with some special characteristics. To 
create a kernel, you simply create an image and set its pixel values.

   There are some predefined functions that can convolve the image with 
gaussian and sobel kernels. But you can create a gaussian kernel by simply 
calling imProcessRenderGaussian. A sobel kernel can be created using:

   imImage* kernel = imImageCreate(3, 3, IM_GRAY, IM_INT);
   imImageSetAttribute(kernel, "Description", IM_BYTE, -1, (void*)"SobelY");

   int* kernel_data = (int*)kernel->data[0];

   kernel_data[0] = 1;
   kernel_data[1] = 2;
   kernel_data[2] = 1;
   kernel_data[3] = 0;
   kernel_data[4] = 0;
   kernel_data[5] = 0;
   kernel_data[6] = -1;
   kernel_data[7] = -2;
   kernel_data[8] = -1;

   Just for curiosity, if you have MATLAB why to use IM? MATLAB should have 
already everything you need for image processing with the additional toolkit.

Best,
scuri

At 12:57 2/2/2005, yip tommy wrote:
>I have my own data (that is exported from MATLAB), I
>want to create an image to have process to this image,
>such as convolution. Can I use imImageInit() function
>to do that? May anyone teach me how to allocate my own
>data to do image operation?
>
>Also, I know that IM can do convolution, but it
>requires a kernal. How to create the kernal? For
>example, I want to have Gaussian and Sobel kernal.
>
>Thanks very much.
>
>Tommy
>
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