topic Re: JPEG lossless DeCoding problem in Intel® Integrated Performance Primitives

JPEG lossless DeCoding problem

senmeganath — Fri, 17 Jul 2009 09:57:56 GMT

Hello,

I'm currently running into problems while decoding some 16/12 bit jpg lossless grayscale pictures to bmp using code from the UIC example

My code is working for fine for all 8 bit images. but its failing for 12/16 bit JPEG lossless images.

Picture information:
witdh = 990
height = 24950
bits per pixel = 16 bit
number of planes = 1

Do you have any idea what is happening here? I think that every value should be valid as source pixel when decoding JPEG lossless.

I've attached the Compressed & decompressed imageData. please do the needful.

Thanks
Senthil.

Re: JPEG lossless DeCoding problem

Chao_Y_Intel — Mon, 20 Jul 2009 06:06:48 GMT

Hi Senthil,

Have you tried uic_transcoder_con application in the UIC sample?This sample application may provide you some example on using the UIC.

Thanks,
Chao

Re: JPEG lossless DeCoding problem

senmeganath — Mon, 20 Jul 2009 06:39:08 GMT

Quoting - Chao Yu (Intel)

Hi Senthil,

Have you tried uic_transcoder_con application in the UIC sample?This sample application may provide you some example on using the UIC.

Thanks,
Chao

Hi Chao Yu,

Yes, I am using uic_transcoder_con application sample code. but its working fine for 8 precision images but its failing 12/16 precision images.

Re: JPEG lossless DeCoding problem

senmeganath — Mon, 20 Jul 2009 10:02:11 GMT

Quoting - senmeganath

Hi Chao Yu,

Yes, I am using uic_transcoder_con application sample code. but its working fine for 8 precision images but its failing 12/16 precision images.

Hi Chao Yu,

Either i reduced bits from 16/12 to 8, and then will use JPEGDecoder. or any other way to Decode. please guide me.

Re: JPEG lossless DeCoding problem

senmeganath — Wed, 22 Jul 2009 04:40:37 GMT

Quoting - senmeganath

Hi Chao Yu,

Either i reduced bits from 16/12 to 8, and then will use JPEGDecoder. or any other way to Decode. please guide me.

Hi Chao Yu,

My problem getting solved using the "reducedBits" method.

once decode a 16/12 bit image, we need to reduce the bits to 8. thanks for ur help.

Re: JPEG lossless DeCoding problem

Chao_Y_Intel — Wed, 22 Jul 2009 07:36:46 GMT

thanks for sharing in forum, senmeganath.