A 30 µW 30 fps 110 × 110 Pixels Vision Sensor Embedding Local Binary Patterns Andrew Berkovich, Student Member , IEEE, Michela Lecca

Abstract

We present a 110 × 110 pixel vision sensor that com- putes the Local Binary Pattern s (LBPs) of an imaged scene with a power consumption of 30 µW at 30 fps. The LBP of a given pixel is a binary vector , encoding the direction and sign of image contrast with respect to its neighbors. Each LBP provides a visual descrip- tion of an image's local structure that is widely used for texture and object recognition. In the sensor proposed here, each pixel de- tects its corresponding LBP with respect to its four neighboring pixels and saves this information into a digital map using 6 bits to encode each pixel. The operation is executed during the exposure time and requires 83 pW/pixel f r a m et ob ec o m p u t e d .T h ec h i p is implemented in a 0.35 µm CMOS featuring 34 T square pixels with 26 µm pitch. We illustrate some examples of image descrip- tion based on the LBPs output by the sensor.