Design of a CCD focal-plane codec preprocessor for lossless image compression
نویسندگان
چکیده
The design of a CCD-based codec preprocessor integrated with an areal imager is presented. The imager is a 256x256 buried channel frame transfer device with 15x15 um2pixels. Conventionally, imagers deliver pixel data in a raster-scan sequential format. Typical of many image processing tasks, the image coding scheme used in our lossless compression algorithm requires 3x3 pixel neighborhood blocks with the center pixel arriving first. Several techniques for accomplishing this type of neighborhood reconstruction (NR), consisting of both global (row) and local (pixel) reordering operations are described and realized on the focal-plane. The CCD NR circuits are designed to operate at a 30 Hz frame rate with minimal power (< 10 uW) and realestate (< 250x400 um2). The codec preprocessor consists of the NR circuitry and subsequent pyramid sampler. Differential output provides off-chip electronics with data suitable for coding and compressed transmission.
منابع مشابه
EEDI Of SPlE - Tre InternationaJ Society for Optical Engineering
The use of charge-coupled device (CCD) circuits in Z-plane architectures for focal-plane image processing is discussed. The low-power, compact layout nature of CCDs makes them attractive for Z-plane application. Three application areas are addressed; non-uniformity compensation using CCD MDAC circuits, neighborhood image processing functions implemented with CCD circuits, and the use of CCDs fo...
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