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A new algorithm is proposed for predicting pixels for inter frame coding without side information. Many approaches in the past exploited either spatial or temporal correlations for generating prediction signals of an image in a block−by−block basis. Our method proposed in this paper exploits both spatial and temporal correlations at once to predict the(More)
A template matching prediction based on a group of reconstructed pixels surrounding a target block enables prediction of pixels in the target block without motion information. The predictor of a target block is produced by minimizing the matching error of the template. Due to the freedom possessed by the template, the residuals of a target block may become(More)
This paper firstly presents a study of video quality for H.264 compressed videos compared to MPEG-4 (simple profile) from a perceptual point of view. Traditionally, peak signal-to-noise ratio (PSNR) has been used to represent the quality of a compressed video sequence. However, PSNR has been found to correlate poorly with subjective quality ratings,(More)
In general, low and very-low bitrate video communication systems cannot achieve the full frame rate (25Hz for PAL or 30Hz for NSTC), which brings temporal distortion. The influence of reduced frame rate on subjective quality evaluation is a very important topic for both perceptual quality metrics and communication system optimization. In this paper, we(More)
We consider the mobile service scenario where video programming is broadcast to low-resolution wireless terminals. In such a scenario, broadcasters utilize simultaneous data services and bi-directional communications capabilities of the terminals in order to offer substantially enriched viewing experiences to users by allowing user participation and user(More)
The bulk of the video content available today over the Internet and over mobile networks suffers from many imperfections caused during acquisition and transmission. In the case of user-generated content, which is typically produced with inexpensive equipment, these imperfections manifest in various ways through noise, temporal flicker and blurring, just to(More)