IEEE Trans Image Process - Antialiasing filter design for subpixel downsampling via frequency-domain analysis.

Tópicos

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Resumo

In this paper, we are concerned with image downsampling using subpixel techniques to achieve superior sharpness for small liquid crystal displays (LCDs). Such a problem exists when a high-resolution image or video is to be displayed on low-resolution display terminals. Limited by the low-resolution display, we have to shrink the image. Signal-processing theory tells us that optimal decimation requires low-pass filtering with a suitable cutoff frequency, followed by downsampling. In doing so, we need to remove many useful image details causing blurring. Subpixel-based downsampling, taking advantage of the fact that each pixel on a color LCD is actually composed of individual red, green, and blue subpixel stripes, can provide apparent higher resolution. In this paper, we use frequency-domain analysis to explain what happens in subpixel-based downsampling and why it is possible to achieve a higher apparent resolution. According to our frequency-domain analysis and observation, the cutoff frequency of the low-pass filter for subpixel-based decimation can be effectively extended beyond the Nyquist frequency using a novel antialiasing filter. Applying the proposed filters to two existing subpixel downsampling schemes called direct subpixel-based downsampling (DSD) and diagonal DSD (DDSD), we obtain two improved schemes, i.e., DSD based on frequency-domain analysis (DSD-FA) and DDSD based on frequency-domain analysis (DDSD-FA). Experimental results verify that the proposed DSD-FA and DDSD-FA can provide superior results, compared with existing subpixel or pixel-based downsampling methods.

Resumo Limpo

paper concern imag downsampl use subpixel techniqu achiev superior sharp small liquid crystal display lcds problem exist highresolut imag video display lowresolut display termin limit lowresolut display shrink imag signalprocess theori tell us optim decim requir lowpass filter suitabl cutoff frequenc follow downsampl need remov mani use imag detail caus blur subpixelbas downsampl take advantag fact pixel color lcd actual compos individu red green blue subpixel stripe can provid appar higher resolut paper use frequencydomain analysi explain happen subpixelbas downsampl possibl achiev higher appar resolut accord frequencydomain analysi observ cutoff frequenc lowpass filter subpixelbas decim can effect extend beyond nyquist frequenc use novel antialias filter appli propos filter two exist subpixel downsampl scheme call direct subpixelbas downsampl dsd diagon dsd ddsd obtain two improv scheme ie dsd base frequencydomain analysi dsdfa ddsd base frequencydomain analysi ddsdfa experiment result verifi propos dsdfa ddsdfa can provid superior result compar exist subpixel pixelbas downsampl method

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