topic Re: Universal Pyramid Bug? in Intel® Integrated Performance Primitives

Universal Pyramid Bug?

herbert_ramoser — Tue, 31 Jan 2006 15:24:44 GMT

Hello!

I have tried to construct integer data type (uint8, uint16) universal pyramids using IPP 5.0. However, the function PyramidLayerDown sets the destination image to all zeros instead filtering and downsampling the source image. This has been tested with several filters. Note: the same code works with floating point data!

Has anybody experienced the same problems?

System: P4 HT, Windows XP, VS 2003

Best regards,
Herbert

Re: Universal Pyramid Bug?

Intel_C_Intel — Thu, 02 Feb 2006 14:54:15 GMT

Universal Pyramid functions (in 5.0 release) contain a bug connected with kernel scaling that results in zero output image. It is corrected in 5.1 Gold release

Re: Universal Pyramid Bug?

herbert_ramoser — Thu, 02 Feb 2006 21:05:17 GMT

Thank you for this reply. When will version 5.1 be available?

-Herbert

Message Edited by herbert.ramoser@gmx.net on 02-02-2006 05:05 AM

Re: Universal Pyramid Bug?

Intel_C_Intel — Fri, 03 Feb 2006 18:50:28 GMT

There is no official information yet, I hope few months.

You can get round this bug by explicit scaling the kernel. For ippiPyramidLayerDown_8u function normalized kernel elements (sum=1) should be multiplied by 2^15 and converted to integers. No change in your program should be done after thisbug correction.