Re: Fast way of splitting an image into bit planes ?

On May 1, 4:06 pm, Terence <tbwri...@[EMAIL PROTECTED]
> wrote:
> On Apr 28, 5:07 pm, "Skybuck Flying" <BloodySh...@[EMAIL PROTECTED]
> wrote:
>
>
>
> > Idea was to:
>
> > Take 1 bit from the first pixel.
> > Take 1 bit from the second pixel.
> > Take 1 bit from the third pixel.
> > Take 1 bit from the fourth pixel.
>
> > Etc.
>
> > Up to 32 bits.
>
> > 32 bits fit in a longword.
>
> > Then write the longword to the output.
>
> > Repeat until all pixels processed.
>
> > Then repeat again for the next bit position.
>
> > So starts with first bit of each pixel.
>
> > Then repeat the loop again for the second bit of each pixel.
>
> > (Repeat this loop for all 24 bit positions).
>
> > This way finally all bit planes would be extracted.
>
> > Hope this clearifies the idea a bit ;) :)
>
> > Bye,
> >   Skybuck.
>
> I know I came in late.
> The above is a description of bitwise transpose of a matrix from row
> order to column order.
> I faced this problem in robotic vision, extracting colour plane data
> from camera input buffers.
> One solution was old ferrite core meemories and both-ways access.
> I suspect there will be on-chip operations is graphics cards for this
> now; and a LOT faster.
> The interesting thing is this also a problem in market research data
> processing.


Can you please extrapolate ? Thanks !!