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Título

Low-Power CMOS Vision Sensor for Gaussian Pyramid Extraction

Autor Suárez, Manuel; Brea, V.M.; Fernández-Berni, J. ; Carmona-Galán, R. ; Cabello, D.; Rodríguez-Vázquez, Ángel
Palabras clave CMOS Vision Sensors
Gaussian Filters
Image Pyramids
Switched-Capacitor Circuits
Per-Pixel 20 Processing
Fecha de publicación 2017
EditorInstitute of Electrical and Electronics Engineers
Citación IEEE Journal of Solid State Circuits, 52(2): 483-495 (2017)
ResumenThis paper introduces a CMOS vision sensor chip in a standard 0.18 μm CMOS technology for Gaussian pyramid extraction. The Gaussian pyramid provides computer vision algorithms with scale invariance, which permits having the same response regardless of the distance of the scene to the camera. The chip comprises 176×120 photosensors arranged into 88×60 processing elements (PEs). The Gaussian pyramid is generated with a double-Euler switched capacitor (SC) network. Every PE comprises four photodiodes, one 8 b single-slope analog-to-digital converter, one correlated double sampling circuit, and four state capacitors with their corresponding switches to implement the double-Euler SC network. Every PE occupies 44×44 μm2 . Measurements from the chip are presented to assess the accuracy of the generated Gaussian pyramid for visual tracking applications. Error levels are below 2% full-scale output, thus making the chip feasible for these applications. Also, energy cost is 26.5 nJ/px at 2.64 Mpx/s, thus outperforming conventional solutions of imager plus microprocessor unit.
Versión del editorhttps://doi.org/10.1109/JSSC.2016.2610580
URI http://hdl.handle.net/10261/143595
DOI10.1109/JSSC.2016.2610580
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