C6678: lossless JPEG encoder

Gunter Schmer

Genius 14352 points

Hi,

a C66x implementation of JPEG encoder is here

http://software-dl.ti.com/dsps/dsps_public_sw/codecs/C6678/JPEG_E/latest/index_FDS.html

Is there a lossless version of a JPEG encoder available?

Thanks,

--Gunter

over 10 years ago

0 Raja over 10 years ago

TI__Guru* 81335 points

Hi Gunter,

I think we do not have any other JPEG encoder for DSP C6678. I am checking internally to confirm the same. Thank you for your patience.

0 Paula Carrillo over 10 years ago in reply to Raja

TI__Mastermind 40580 points

Hi Gunter, from our codec experts I got below answer:

"Yes, we could set our JPEG to lossless, by setting "Qp" value to 100 in the "Testparams.cfg" at the encoder.

Please refer to section 4.2.1.6 in the "JPEG_BL_Encoder_C6678_UserGuide.pdf" for the explanation about this parameter."

JPEG_BL_Encoder_C6678_UserGuide.pdf

thank you,

Paula

0 Gunter Schmer over 10 years ago in reply to Paula Carrillo

TI__Genius 14352 points

Hi Paula,

Thanks for the feedback. I had a couple of questions.

[] Is it true that the "lossless" mode is fully controlled by the JPEG encoder, i.e. setting QP=100 will cause the encoder to encode in lossless mode. The JPEG decoder should just take the encoded stream and decode it, ignorant to the QP essentially.

[] How much is the JPEG decoder actually optimized for the C66x core (vs C64+ core)

Thanks,

--Gunter

0 Paula Carrillo over 10 years ago in reply to Gunter Schmer

TI__Mastermind 40580 points

Hi Gunter, please see answers below:
1) Yes
2) We have not optimized any thing specific to C66x core. We just ported the C64x+ optimizations to C66x.

thank you,
Paula

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C6678: lossless JPEG encoder