topic Calculating leftTopBorder and rightBottomBorder for ippiCopyWra in Intel® Integrated Performance Primitives

Calculating leftTopBorder and rightBottomBorder for ippiCopyWrapBorder_32f_C1R during wavelet transform

th_weber — Tue, 15 Nov 2011 13:08:07 GMT

Hi,

I would like to calculate a 2d wavelet transform with a filter tap of length 3 and anchor point 0, more precisely:
lenLow = 3;
lenHigh = 3;
anchorLow = 0;
anchorHigh = 0;

Following the manual at
http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/ippxe/ipp_manual_win_mac/IPPI/ippi_ch13/functn_WTFwd.htm,
this means I end up with a value of "-1" for rightBorderLow, more precisely:

leftBorderLow = 2;
leftBorderHigh = 2;
rightBorderLow = -1;
rightBorderHigh = -1;

and then
leftTopBorder = 2;
rightBottomBorder = -1;

This means that the later call to ippiCopyWrapBorder_32f_C1R() fails, as I want to add a left-top border of 2 pixels, but the image has only been grown by leftTopBorder+rightBottomBorder=1 pixel.

So, how do I proceed here? IPP is 6.1, but the example code hasn't change for IPP 7.0.

Thanks
Thomas

Calculating leftTopBorder and rightBottomBorder for ippiCopyWra

Chao_Y_Intel — Wed, 16 Nov 2011 07:08:43 GMT

Hi Thomas,

Wrap border is simple. If you could can not call the function. It may only needs to extendend by yourself. For example,
1 2 3 4 56
is extentend as:
3 4 5 1 2 3 4 5 1 2 3
The data underlined is extended data. A more complex examples on other extenstion can be found here:
http://software.intel.com/en-us/forums/showthread.php?t=78540

Thanks,
Chao

Calculating leftTopBorder and rightBottomBorder for ippiCopyWra

th_weber — Wed, 16 Nov 2011 08:55:58 GMT

Hi Chao,

thanks for your answer. However, my question is more along the lines of whether I'm doing something wrong when choosing an anchor point at 0? And how to calculate the values for leftTopBorder and rightBottomBorder?

Thanks

Thomas