Determination of frequency sensitivities for perceptualsubband image coding

Fong, W.C.; Chan, S.C.; Ho, K.L.

doi:10.1049/el:19970406

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“…0-7803-4455-3/98/$10.00 0 1998 IEEE It can be seen from equations (1) and (2) that the parameters that we need to determine are the base threshold, t , , and the constants, wk and a,. Recently, a very simple and systematic method [5] is proposed to compute the base threshold t , for any subband system in any color space. Using this method and the equations (1) and (2), masking thresholds for any subband system can easily be computed.…”

Section: Iv-237mentioning

confidence: 99%

A visual model for subband image coding

Fong¹,

Chan²,

Ho³

ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Circuits and Systems (Cat. No.98CH36187)

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In this paper, we propose a visual model for the general subband coding system. This model is a generalization of Watson's visual model for DCT. Based on this model, a new perceptual distortion is proposed which can be used together with an efficient bit allocation algorithm to determine the quantizer stepsizes of subband coders. Simulation results and subjective viewing tests demonstrate that the proposed approach is very effective in improving the subjective quality of the encoded image at low bit rate.

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Section: Iv-237mentioning

confidence: 99%