Enhancement of PCM and DPCM Images Corrupted by Transmission Errors

Author

Ngan, K.N. ; Steele, R.

Author_Institution

Loughborough Univ. of Technology, Loughborough, Leics., England

Volume

30

Issue

1

fYear

1982

fDate

1/1/1982 12:00:00 AM

Firstpage

257

Lastpage

265

Abstract

Simple methods for enhancing PCM and DPCM monochrome pictures corrupted by transmission bit errors are described. For PCM signals the enhancement is achieved by operating exclusively on the corrupted image, without recourse to any side-information from the transmitter. The DPCM signals have simple protection codewords that increase the bit rate by 12 percent (if majority protection coding is used). Photographs of the original, corrupted, and enhanced images are presented, together with SNR as a function of percentage bit error rate (BER) for the corrupted and enhanced picture. For 0.1<;BER<;1.0, the SNR gains for PCM and DPCM are ≃10 and 18 dB, respectively. For BER<;0.05 percent there is imperceptible picture degradation.

Keywords

data communication systems; picture processing; pulse code modulation; video signals; DPCM; PCM; bit error rate; monochrome pictures; protection codewords; transmission bit errors; Bit error rate; Bit rate; Channel coding; Decoding; Degradation; Image reconstruction; Image sampling; Phase change materials; Protection; Transmitters;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOM.1982.1095366

Filename

1095366