Title :
Smart image sensor for wide dynamic range by variable integration time
Author :
Ogi, Takahiro ; Yasuda, Takaya ; Hamamoto, Takayuki ; Aizawa, Kiyoharu
Author_Institution :
Dept. of Elec. Eng, Ibkyo Univ. of Sci., Tokyo, Japan
fDate :
30 July-1 Aug. 2003
Abstract :
We propose a computational image sensor in which each pixel controls its integration time. The integration time of each pixel is selected from among several lengths of integration time and the integration time is shortened if the pixel is bright. Although the integration time of each pixel varies, the pixel intensity is adjusted on the sensor in real time. The dynamic range of the pixel value output from the proposed sensor is increased considerably. A prototype of 64×48 pixels has been fabricated. The proposed sensor has simple functions for detection of saturation to control the integration time and nonlinear image reconstruction. By using experiments, it has been verified that the sensor can achieve a wide dynamic range by adapting to light.
Keywords :
image reconstruction; image sensors; intelligent sensors; parallel architectures; computational image sensor; field programmable gate array; light adaptation; linear reconstruction; nonlinear image reconstruction; parallel architecture; pixel control; smart image sensor; variable integration time; wide dynamic range; Charge coupled devices; Circuits; Dynamic range; Electric variables control; Heuristic algorithms; Image reconstruction; Image sensors; Intelligent sensors; Prototypes; Smart pixels;
Conference_Titel :
Multisensor Fusion and Integration for Intelligent Systems, MFI2003. Proceedings of IEEE International Conference on
Print_ISBN :
0-7803-7987-X
DOI :
10.1109/MFI-2003.2003.1232653
