IEEE Trans Image Process - A two-channel overlapped block transform for image compression.

Tópicos

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{ imag(2830) propos(1344) filter(1198) }
{ imag(1057) registr(996) error(939) }
{ algorithm(1844) comput(1787) effici(935) }
{ featur(1941) imag(1645) propos(1176) }
{ can(981) present(881) function(850) }
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Resumo

In this correspondence, a new two-channel overlapped block transform is introduced by prefiltering the Haar transform. The prefiltering employs plane rotations with one single rotation angle to achieve high computational efficiency. The resulting transform is equivalent to a periodically time-varying (PTV) filter bank. The proposed transform or PTV filter bank has several advantages for image coding. First, symmetric extension is very easily performed at the boundaries in spite of the fact that the filters are asymmetric. Second, arithmetic complexity can be reduced to simple shifts and adds. Finally, the performance for image compression is shown to be high, both in terms of visual quality and PSNR. As a result, the proposed transform is a competitive alternative to the 5/3 and the 9/7 filters, which are currently popular for subband/wavelet image coders.

Resumo Limpo

correspond new twochannel overlap block transform introduc prefilt haar transform prefilt employ plane rotat one singl rotat angl achiev high comput effici result transform equival period timevari ptv filter bank propos transform ptv filter bank sever advantag imag code first symmetr extens easili perform boundari spite fact filter asymmetr second arithmet complex can reduc simpl shift add final perform imag compress shown high term visual qualiti psnr result propos transform competit altern filter current popular subbandwavelet imag coder

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