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Re: ycbcr = rgb2ycbcr(rgb)
From: |
Wolfgang Schechinger |
Subject: |
Re: ycbcr = rgb2ycbcr(rgb) |
Date: |
Mon, 04 Aug 2008 09:48:43 +0200 |
Dear Bharat,
as you probably want integers anyway, have you considered to drop the lowest 8
bits or to do the whole conversion with integers?
Wo
instead of dividing by 256, -------- Original-Nachricht --------
> Datum: Mon, 4 Aug 2008 10:25:17 +0530
> Von: "bharat pathak" <address@hidden>
> An: address@hidden
> Betreff:
> I have written a function to convert rgb to ycbcr. if I call this function
> with rgb matrix being 512x512x3 then it takes 2.4 seconds to execute
> this code. what is the way in which I can make this run faster?
>
> I have also attached the main program where this function is called.
>
> #######################################################################
>
>
> function ycbcr = rgb2ycbcr(rgb)
>
> red = rgb(:,:,1);
> grn = rgb(:,:,2);
> blu = rgb(:,:,3);
>
> y = round((77*red + 150*grn + 29*blu)/256) + 16;
> cb = round((-44*red - 87*grn + 131*blu)/256) + 128;
> cr = round((131*red - 110*grn - 21*blu)/256) + 128;
>
> ycbcr(:,:,1) = y;
> ycbcr(:,:,2) = cb;
> ycbcr(:,:,3) = cr;
>
> endfunction
>
>
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- [no subject], bharat pathak, 2008/08/04
- Re:, soren, 2008/08/04
- Re: ycbcr = rgb2ycbcr(rgb),
Wolfgang Schechinger <=
- Re:, Francesco Potorti`, 2008/08/04
- Re:, Jaroslav Hajek, 2008/08/04
- Re:, soren, 2008/08/04
- Re: Re:, bharat pathak, 2008/08/04
- Re: Re:, soren, 2008/08/04
- Re:, Bill Denney, 2008/08/04
- Re: Re:, Jaroslav Hajek, 2008/08/04
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