Need help with bicubic algorithm for video scaler, HDTV

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Hi,
I am currently doing video scaler project, in which I have to upscalce the PAL and NTSC videos to HDTV videos, I have chosen bicubic interpolation algorithm[^] for this. But I am finding difficulty in selecting the 16 neighbouring pixels for interpolation (especially the border cases). If anybody did some work on this...

Please give me reply. It would be helpful for me.....

Posted 2-Jun-10 2:00am

athalon

Updated 2-Jun-10 2:24am

Moak

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CPallini · Answer 1 · 2010-06-08T21:54:00

In my "Plain C Resampling DLL", following Libor Tinka's ("Image Resizing - outperform GDI+") approach, I discarded the out-of-border contributions in the weighted sum, i.e. something like:

C

for (j = left; j<= right; j++)
{
    if ( j < 0 || j >= iw) continue; /* HERE out-of border contributions are discarded */
    weight = (*pFnFilter)( (center - j) * FILTER_FACTOR);
    if (weight == 0.0) continue;
    n = h_count[i]; /* Since h_count[i] is our current index */
    p_pixel[n] = j;
    p_weight[n] = weight;
    h_wsum[i] += weight; /* the sum is weighted */
    h_count[i]++; /* Increment contribution count */
}/* j */

:)