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Laboratory of Media Dynamics
Graduate School of Information Science and Technology
Hokkaido University

Image Coding

Frame Interpolation Technology

When viewing a video, the higher the frame rate, the smoother the motion that is shown by the video. Much technology for viewing high-frame rate videos already exists. However, since such video contains a lot of data, it is difficult to handle in environments with limited storage or transmission bandwidth. By utilizing frame interpolation, we are able to solve this problem by obtaining a high-frame rate video from a low-frame rate video.

Super-resolution Technology

Images and video captured by mobile phones and smart phones are typically of low resolution, since the computational resources on those platforms are limited. When upscaling such videos for viewing on large screen TVs, the resolution is insufficient and the videos appear blurry. Super-resolution technology estimates the high-frequency components of upscaled images, making them appear clear and sharp, allowing the capture of highly detailed images and video.

Error Concealment for Video Transmission

Poor transmission quality may cause errors when receiving the video sequence, leading to the visual quality degradation of the video. More specifically, partial “blocks” of the video signal are often lost. Error concealment technology works on the receiver’s side, and repairs videos that were degraded due to errors. More specifically, since video is a continuous sequence of frames, and the difference between any two adjacent frames is usually small, it is possible to recover the error-free frame by utilizing the frame before it.