スーパーハイビジョン映像を用いた実時間ハイビジョン電子ズーム装置の開発

摘要

近年，ハイビジョンを上回る解像度を持つ次世代の超高rn精細映像システムの研究・開発が活発に行われている．そrnの中で，NHKでは，世界に先駆けてハイビジョンの16倍rnの画素数を持つスーパーハイビジョン（SHV）の研究に取rn組み，830万画素4板画素ずらし方式によるカメラや表rn示システムなどの開発を行ってきた．%We developed a real-time electronic zoom system that can crop any area in a four-sensor pick-up type Super Hi-Vision (SHV) video and output the area as an HDTV video. The cropped area can be selected using the type of remote control used in a conventional robotic camera system. The maximum zoom ratio is 4X to maintain the HDTV quality. This electronic zoom system enables new program production techniques. For example, an HDTV video of a decisive moment can be cropped from a wide-angle SHV video shot. To evaluate the quality of the cropped image, we examined the resolution, S/N, and chromatic aberrations of generated images. The evaluation results showed that the quality of the cropped HDTV video is good enough for use in HDTV program production.