title: Onboard Image Processing System for Hyperspectral Sensor.
abstract: Onboard image processing systems for a hyperspectral sensor have been developed in order to maximize image data transmission efficiency for large volume and high speed data downlink capacity. Since more than 100 channels are required for hyperspectral sensors on Earth observation satellites, fast and small-footprint lossless image compression capability is essential for reducing the size and weight of a sensor system. A fast lossless image compression algorithm has been developed, and is implemented in the onboard correction circuitry of sensitivity and linearity of Complementary Metal Oxide Semiconductor (CMOS) sensors in order to maximize the compression ratio. The employed image compression method is based on Fast, Efficient, Lossless Image compression System (FELICS), which is a hierarchical predictive coding method with resolution scaling. To improve FELICS's performance of image decorrelation and entropy coding, we apply a two-dimensional interpolation prediction and adaptive Golomb-Rice coding. It supports progressive decompression using resolution scaling while still maintaining superior performance measured as speed and complexity. Coding efficiency and compression speed enlarge the effective capacity of signal transmission channels, which lead to reducing onboard hardware by multiplexing sensor signals into a reduced number of compression circuits. The circuitry is embedded into the data formatter of the sensor system without adding size, weight, power consumption, and fabrication cost.
authors.affiliation: NEC Space Technologies, Ltd., 1-10, Nisshin-cho, Fuchu, Tokyo 183-8551, Japan. h-hihara@bc.jp.nec.com.|Research Center for Advanced Science and Technology, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan. h-hihara@bc.jp.nec.com.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hihara
authors.affiliation: NEC Space Technologies, Ltd., 1-10, Nisshin-cho, Fuchu, Tokyo 183-8551, Japan. k-moritani@bk.jp.nec.com.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Moritani
authors.affiliation: NEC Space Technologies, Ltd., 1-10, Nisshin-cho, Fuchu, Tokyo 183-8551, Japan. m-inoue@pi.jp.nec.com.
authors.forename: Masao
authors.initials: M
authors.lastname: Inoue
authors.affiliation: NEC Space Technologies, Ltd., 1-10, Nisshin-cho, Fuchu, Tokyo 183-8551, Japan. y-hoshi@uf.jp.nec.com.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hoshi
authors.affiliation: Research Center for Advanced Science and Technology, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan. aiwasaki@sal.rcast.u-tokyo.ac.jp.
authors.forename: Akira
authors.initials: A
authors.lastname: Iwasaki
authors.affiliation: Central Research Laboratory, NEC Corporation, 1753, Shimonumabe, Nakahara-Ku, Kawasaki, Kanagawa 211-8666, Japan. j-takada@bc.jp.nec.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Takada
authors.affiliation: Space Systems Division, NEC Corporation, 1-10, Nisshin-cho, Fuchu, Tokyo 183-8551, Japan. h-inada@bx.jp.nec.com.
authors.forename: Hitomi
authors.initials: H
authors.lastname: Inada
authors.affiliation: Institute of Space Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan. suzuki.makoto@jaxa.jp.
authors.forename: Makoto
authors.initials: M
authors.lastname: Suzuki
authors.affiliation: Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan. seki.taeko@jaxa.jp.
authors.forename: Taeko
authors.initials: T
authors.lastname: Seki
authors.affiliation: Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan. ichikawa.satoshi@jaxa.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ichikawa
authors.affiliation: Japan Space Systems, 3-5-8 Shibakoen, Minato-ku, Tokyo 105-0011, Japan. Tanii-Jun@jspacesystems.or.jp.
authors.forename: Jun
authors.initials: J
authors.lastname: Tanii
keywords: Golomb-Rice coding; hierarchical prediction; hyperspectral sensor; lossless image compression; onboard correction; predictive coding; resolution scaling; smile correction