Title :
A CMOS image sensor with motion vector estimator for low-power image compression
Author :
Kawahito, Shoji ; Handoko, Dwi ; Tadokoro, Yoshiaki
Author_Institution :
Dept. of Inf. & Comput. Sci., Toyohashi Univ. of Technol., Japan
Abstract :
This paper presents a novel method of motion vector estimation (MVE) based on the integration of a CMOS image sensor and a motion vector estimation on a chip. The CMOS image sensor has two sensing modes; normal destructive video-rate (30 frame/s) image sensing mode and nondestructive high-speed interpolated image sensing mode. The nondestructive image-sensing is essential to obtain high-speed interpolated images while maintaining high image quality video-rate image. A novel iterative block matching algorithm allows us to estimate the video-rate (30 frame/s) motion vectors accurately from the motion vectors obtained at high-speed interpolated pictures. The iterative block matching reduces the computational complexity by a factor of more than one-tenth compared with the conventional full search block matching algorithm, allowing totally low-power design of video encoders
Keywords :
CMOS image sensors; computational complexity; image matching; image processing equipment; interpolation; iterative methods; low-power electronics; motion estimation; parallel architectures; pipeline processing; video codecs; video coding; CMOS image sensor; destructive video-rate image sensing mode; high-speed interpolated image sensing mode; iterative block matching algorithm; low-power image compression; motion vector estimator; nondestructive image-sensing mode; parallel processing architecture; pipelined processing; predictive vector; reduced computational complexity; totally low-power design; video encoders; Algorithm design and analysis; CMOS image sensors; CMOS technology; Computational complexity; Degradation; Image coding; Image sensors; Iterative algorithms; Motion estimation; Signal to noise ratio;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.776721
