DocumentCode :
699609
Title :
Improved interpolation of 4∶2∶0 colour images to 4∶4∶4 format exploiting inter-component correlation
Author :
Bartkowiak, Maciej
Author_Institution :
Inst. of Electron. & Telecommun., Poznan Univ. of Technol., Poznan, Poland
fYear :
2004
fDate :
6-10 Sept. 2004
Firstpage :
581
Lastpage :
584
Abstract :
The paper deals with the interpolation problem of colour images or video whose chrominance components are down-sampled according to 4:2:0 scheme. Such interpolation is traditionally done using a linear 7-tap FIR filter which introduces some blurring and colour artifacts across the edges and details. The idea discussed in the paper is to improve the interpolation through adaptive filtering. The paper shows that strong higher-order correlation is present between luminance and chrominance channels regardless of the colour representation. This correlation may be exploited to support the interpolation of low resolution chrominance using fine detail information extracted from the luminance component of higher resolution. Experimental results show that the error due to the loss of high-frequency data in downsampling and subsequent upsampling is significantly reduced by the use of the proposed technique.
Keywords :
FIR filters; adaptive filters; image colour analysis; image reconstruction; image representation; interpolation; statistical analysis; adaptive filtering; chrominance channels; chrominance components; colour images; higher-order correlation; intercomponent correlation; interpolation problem; linear 7-tap FIR filter; luminance channels; Abstracts; Boats; Finite impulse response filters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2004 12th European
Conference_Location :
Vienna
Print_ISBN :
978-320-0001-65-7
Type :
conf
Filename :
7080139
Link To Document :
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