JPEG decoder

dave2 — Fri, 28 Jul 2006 18:00:12 GMT

Hi,

Are there any plans to get the IPP JPEG sample decoder to support sampling 4:1:1 JPEG into YUV 4:2:2 ? Most of the JPEG images I see are 4:1:1 in nature and it would be really great to be able to decode them into YUV instead of RGB.

Thanks,
Dave

Re: JPEG decoder

Vladimir_Dudnik — Mon, 31 Jul 2006 20:46:43 GMT

Hi Dave,

you are right, probably the majority of JPEG pictures are in 4:1:1 sampling, due to better compression ratio. But what the reason to convert them into 4:2:2 format? Remember, it will lead to additional quality degradation. I do not think decoder should provide all possible combination for convertions (it can be a lot of code, which actually rarely used). But I think it can be useful to provide possibility to decode JPEG into native color format, say 4:1:1 planar format or 4:2:2 planar format. In this case you can add your custom convertion routines (you may use some of IPP functions for that). We do not plan this support for the nearest IPP release, but we will take into account your request at planning functionality of IPP JPEG codec for future IPP release. Could you please submit your feature request to Intel Premier Support, it will help you to track implementation status.

Regards,
Vladimir

topic JPEG decoder in Intel® Integrated Performance Primitives

JPEG decoder

Re: JPEG decoder