Image coding with the MAP criterion

• BCJR based source coding of image residuals is investigated. From a trellis representation of the residual, a joint source-channel coding system is formed. Then the BCJR algorithm is applied to find the MAP encoding. MAP and minimized squared error encoding are compared. The novelty of this work is the use of the BCJR algorithm and the MAP criterion in the source coding procedure. The source encoding system described preserves more features than an MSE based encoder. Also, blocking artifacts are reduced.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

minimized squared error encoding

decorrelation procedure

convolutional codes

MAP criterion

image coding

maximum a posteriori probability criterion

image residuals

source coding

trellis representation

joint source-channel coding

BCJR algorithm

Bahl-Cocke-Jelinek-Raviv algorithm

Publikations- och innehållstyp

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