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A CMOS Imager with Focal Plane Compression using Predictive CodingThis paper presents a CMOS image sensor with focal-plane compression. The design has a column-level architecture and it is based on predictive coding techniques for image decorrelation. The prediction operations are performed in the analog domain to avoid quantization noise and to decrease the area complexity of the circuit, The prediction residuals are quantized and encoded by a joint quantizer/coder circuit. To save area resources, the joint quantizerlcoder circuit exploits common circuitry between a single-slope analog-to-digital converter (ADC) and a Golomb-Rice entropy coder. This combination of ADC and encoder allows the integration of the entropy coder at the column level. A prototype chip was fabricated in a 0.35 pm CMOS process. The output of the chip is a compressed bit stream. The test chip occupies a silicon area of 2.60 mm x 5.96 mm which includes an 80 X 44 APS array. Tests of the fabricated chip demonstrate the validity of the design.
Document ID
20080017953
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Leon-Salas, Walter D.
(Missouri Univ. Kansas City, MO, United States)
Balkir, Sina
(Nebraska Univ. Lincoln, NE, United States)
Sayood, Khalid
(Nebraska Univ. Lincoln, NE, United States)
Schemm, Nathan
(Nebraska Univ. Lincoln, NE, United States)
Hoffman, Michael W.
(Nebraska Univ. Lincoln, NE, United States)
Date Acquired
August 24, 2013
Publication Date
November 1, 2007
Subject Category
Instrumentation And Photography
Funding Number(s)
CONTRACT_GRANT: NNG06GH64G
Distribution Limits
Public
Copyright
Other

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