Title :
A single chip image sensor embedded smooth spatial filter with A/D conversion
Author :
Tsai, Chia-Chun ; Chou, Huang-Chi ; Lee, Trong-Yen ; Hsiao, Rong-Shue
Author_Institution :
Dept. of Comput. Sci. & Inf. Eng., Nanhua Univ., Chiayi
Abstract :
The paper presents a current-mode CMOS image sensor embedded smooth spatial filter algorithm. The sensor includes a 66times66 pixel array with an on-chip 6-bit analog-to-digital converter that can identify the output value of pixels in gray level resolution. The last row of pixel cells (1times66) based on the double sampling is used for reducing fixed pattern noise (FPN). Processing circuits are dedicated for the spatial filter algorithm and support reusability to increase the image processing speed and to reduce the design complexity and chip area. The sensor chip has been designed and implemented in TSMC 0.35mum 2P4M CMOS mixed-mode process. Each pixel occupies a area of 15.8mumtimes10.6mum with a fill factor of 37.2%. The power consumption is 35.15mW when the sensor operates at 175 frames/second
Keywords :
CMOS image sensors; analogue-digital conversion; current-mode circuits; integrated circuit design; mixed analogue-digital integrated circuits; spatial filters; 0.35 micron; 10.6 micron; 15.8 micron; 35.15 mW; 6 bit; A/D conversion; CMOS mixed-mode process; analog-to-digital converter; current-mode CMOS image sensor; fixed pattern noise; gray level resolution; image processing; pixel cells; processing circuits; sensor chip; smooth spatial filter algorithm; Analog-digital conversion; CMOS image sensors; Circuit noise; Image converters; Image sampling; Image sensors; Noise reduction; Sensor arrays; Spatial filters; Spatial resolution;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692613
