https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766703#M292 In IPP 6.1.5 UIC samples, when Encoding or Decoding a JPeg2000 image, the param struct must be filled in.<BR />One member is "precision", with values J2K_16 and J2K_32; for example "param_jpeg2k.precision = J2K_16".<BR /><BR />I miss documentation for this parameter. What is it for, and what are the requirements and/or effects of using it?<BR /><BR /> Mon, 09 Aug 2010 10:45:29 GMT Thomas_Jensen1 2010-08-09T10:45:29Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766703#M292 In IPP 6.1.5 UIC samples, when Encoding or Decoding a JPeg2000 image, the param struct must be filled in.<BR />One member is "precision", with values J2K_16 and J2K_32; for example "param_jpeg2k.precision = J2K_16".<BR /><BR />I miss documentation for this parameter. What is it for, and what are the requirements and/or effects of using it?<BR /><BR /> Mon, 09 Aug 2010 10:45:29 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766703#M292 Thomas_Jensen1 2010-08-09T10:45:29Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766704#M293 Hello,<BR /><BR /><BR />this parameter control arithmetic precision of internal computatations. When it is J2K_32 it mean 32-bit internal computations will be used and when it is J2K_16 then 16-bit computations will be used where it appropriate. 16-bit computation path allow to reduce a little bit internal memory buffers size.<BR /><BR />Regards,<BR /> Vladimir Mon, 09 Aug 2010 11:39:05 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766704#M293 Vladimir_Dudnik 2010-08-09T11:39:05Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766705#M294 Thanks, but I was looking for an answer as I wrote in my question; Since J2K_16 indeed is faster, and since it uses less memory, can I always use that, also for 16u images, without problems?<BR /> Mon, 09 Aug 2010 13:24:13 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766705#M294 Thomas_Jensen1 2010-08-09T13:24:13Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766706#M295 No. For 16-bit input data internal computations have to use higher precision to avoid artifacts. IPP JPEG2000 codec will ignore that parameter and force 32-bit computations in that case.<BR /><BR />Vladimir Mon, 09 Aug 2010 13:34:39 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766706#M295 Vladimir_Dudnik 2010-08-09T13:34:39Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766707#M296 So, to conclude:<BR /><BR />- For 16u images, is it a requirement to use J2K_32?<BR />- For 8u images, is it sufficient to use J2K_16?<BR />- For 8u images, is it allowed to use J2K_16?<BR /><BR />This information is not available in the IPP samples.<BR /> Mon, 09 Aug 2010 14:40:37 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766707#M296 Thomas_Jensen1 2010-08-09T14:40:37Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766708#M297 Yes, for 8u images it is allowed and sufficient to use 16-bit precision for internal computations. For 16-bit images it is required to use 32-bit precision in internal computations. Mon, 09 Aug 2010 15:44:15 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766708#M297 Vladimir_Dudnik 2010-08-09T15:44:15Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766709#M298 Thanks.<BR /><BR />You could pass this on to your IPP Sample documentation collegues.<BR /> Mon, 09 Aug 2010 16:42:14 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766709#M298 Thomas_Jensen1 2010-08-09T16:42:14Z https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766710#M299 Sure. Unfortunately it is too late for IPP 7.0 release but weconstantly work onimprovement ofdocumentation. Mon, 09 Aug 2010 16:50:55 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Missing-documentation-for-param-jpeg2k-precision/m-p/766710#M299 Vladimir_Dudnik 2010-08-09T16:50:55Z