Title :
A CMOS Front-End for a Lossy Image Compression Sensor
Author :
Lin, Zhiqiang ; Hoffman, Michael W. ; Leon, Walter D. ; Schemm, Nathan ; Balkir, Sina
Author_Institution :
Dept. of Electr. Eng., Nebraska Univ., Lincoln, NE
Abstract :
A CMOS image sensor has been designed to perform the front-end image decomposition in a prediction-SPIHT image compression scheme. The prediction circuitry based on charge sharing is integrated inside the sensor array to perform 3-level image decomposition. A CMOS test chip has been prototyped and tested. The test results justify the pixel design and demonstrate that lossy prediction based focal plane image compression can be realized inside the sensor pixel array to achieve a high frame rate but with much less data readout volume. Also, the sensor can be used to achieve comparable compression performance with much lower computational complexity compared to 2D discrete wavelet transform (DWT) based image compression.
Keywords :
CMOS image sensors; data compression; discrete wavelet transforms; integrated circuit testing; sensor arrays; 2D discrete wavelet transform; CMOS image sensor; CMOS test chip; charge sharing; focal plane image compression; image decomposition; lossy image compression sensor; prediction circuitry; prediction-SPIHT image compression scheme; sensor array; sensor pixel array; CMOS image sensors; Charge-coupled image sensors; Circuit testing; Discrete wavelet transforms; Image coding; Image decomposition; Image sensors; Pixel; Prototypes; Sensor arrays;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378763
