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In this paper, 4K & 2K multi-resolution and 60 fps progressive video transmission system is introduced. And its application to the world first bi-directional 4K and 60 fps communication experiments over IP network is discussed. This system implements JPEG 2000 multi-layer scalable coding technology and operates progressively with 60 fps. Its resolution is up to 4096 ?? 2160 pixels (called 4K),...
Realtime video streaming is one of the most important tool for the computer supported collaborative workspace (CSCW). CSCW requires bi-directional or many-directional video exchanging. The delay or jitter caused by network quality is easily affecting application or users of CSCW. The quality of experience (QoE) of CSCW with video streaming over IP networks depends on the quality of network. It is...
The lossy compression performance of two different ordering schemes: dispersed dither type and clustered dither type, are studied and compared. For lossy coding of ordered dither images, two methods; multi-level lossy image coding (LML) with post-processing of ordered dithering and transmission of the number of black pixels in a block of bi-level pixels (BPN), with two kind of bit rates, corresponding...
This paper proposes a novel tabletop display named "EmiTable" that can emit imperceptible metadata along with the tabletop image. Actually, our system displays a visual image on the tabletop whose pixels contain metadata as bit patterns for dedicated receivers. Since the bit patterns are embedded as high-speed flickers, the users would not perceive the hidden signal behind the image. However,...
A lossless compression of an error-diffused image by lossless coding of entropy-minimized multi-level image, which can produce given halftone image at the receiver side, is studied. Through the study, block-type error diffusion is introduced to consider the two-dimensional entropy, and both of entropy-based prioritisation method and prediction-error-based prioritisation method in inverse halftoning...
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