Title :
A Spatial-Temporal Multiresolution CMOS Image Sensor With Adaptive Frame Rates for Tracking the Moving Objects in Region-of-Interest and Suppressing Motion Blur
Author :
Choi, Jaehyuk ; Han, Sang-Wook ; Kim, Seong-Jin ; Chang, Sun-Il ; Yoon, Euisik
Author_Institution :
Univ. of Minnesota, Minneapolis
Abstract :
In this paper, we report a CMOS image sensor for spatial-temporal multiresolution images. This image sensor simultaneously generates two outputs: one for normal images (<30 fps) of stationery background and the other for adaptable frame-rate images (over 960 fps) of moving objects. The moving objects are tracked with a reduced spatial resolution in the region-of-interest (ROI). The entire image is reconstructed from the two images with the details in stationery objects and the suppressed motion blur in moving objects. High frame rate only applies to the ROI; therefore, the proposed scheme can significantly reduce power consumption by adjusting the optimal use of bandwidth. In order to provide real-time decision of ROI, the sensor employs on-chip motion-detection circuits based on the inter-pixel switch operation by storing the previous frame signal in a floating diffusion node. This allows a small pixel implementation without adding any extra in-pixel memory components. A prototype chip has been implemented using a 0.35 mum 1P4M standard CMOS process and multiresolution images have been successfully captured. The fabricated chip operates at 3.3 V and consumes 75 mW in the multiresolution readout of a 256times256 normal image at 30 fps and a 64times64 ROI image at 240 fps.
Keywords :
CMOS image sensors; detector circuits; image resolution; power consumption; tracking; CMOS image sensor; adaptive frame rates images; floating diffusion node; inter-pixel switch operation; motion blur suppression; moving objects tracking; on-chip motion-detection circuits; power 75 mW; power consumption; prototype chip; real-time decision; region-of-interest; spatial-temporal multiresolution images; voltage 3.3 V; CMOS image sensors; Energy consumption; Image generation; Image reconstruction; Image resolution; Image sensors; Signal resolution; Spatial resolution; Switches; Tracking; Adaptive frame rates; CMOS image sensors; motion detection; multiresolution; region-of-interest (ROI);
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2007.908716