topic Re: ippiResize - Vertical Flipping in Intel® Integrated Performance Primitives

ippiResize - Vertical Flipping

dean_taylor — Fri, 04 Nov 2005 00:24:19 GMT

Hi,

The ippiResize function does not seem to support a "negative step"...

The reason why I'm attempting to use a "negative step" is to simutaiously resize and vertically flip the image.

The documentation does not explictly state that a negative step is either supported or not.

Any comments or ideas?

Thanks,
Dean.

Re: ippiResize - Vertical Flipping

dean_taylor — Fri, 04 Nov 2005 00:29:26 GMT

Just one note when attempting to do "vertical flipping" I'm using the following code to adjust the approperate variables:

--- snip ---
nNewSrcStep = -nSrcStep;
pNewSrcData = pSrcData + nSrcStep * (nSrcHeight - 1);
--- snip ---

Thanks,
Dean.

Re: ippiResize - Vertical Flipping

Vladimir_Dudnik — Fri, 04 Nov 2005 01:32:43 GMT

Hi Dean,

Areyou still use IPP v4.1? Weadded support for negative step in ippiResize functionin IPP v5.0 (there were requests for that). Can you move to the latest version of library?

Regards,
Vladimir

Re: ippiResize - Vertical Flipping

dean_taylor — Fri, 04 Nov 2005 01:45:21 GMT

Excellent!

Have not had chance to look at IPP v5.0, gives me an excuse to now!

Does ippiCopy also support negative values?
(I am aware that I can use ippiMirror, but the code would be a lot shorter if ippiCopy did support it)

Thanks,
Dean.

Re: ippiResize - Vertical Flipping

Vladimir_Dudnik — Fri, 04 Nov 2005 04:07:13 GMT

Dean, yes in IPP v5.0 ippiCopy also support negative step.

Vladimir

Re: ippiResize - Vertical Flipping

dean_taylor — Sat, 05 Nov 2005 00:19:16 GMT

Implemented...

works for me,

Thankyou,
Dean.

Re: ippiResize - Vertical Flipping

Vladimir_Dudnik — Wed, 09 Nov 2005 02:51:13 GMT

great,feedback we have from this forum is definetely help us to improve IPP libraries (there was request for support of negative step, and this functionality was implemented).