This paper presents a 128×128 charge-mode CMOS imaging sensor that computes separable transforms directly on the focal plane. The pixel is a unique extension of the widely reported Active Pixel Sensor (APS) cell. By capacitively coupling across an array of such cells onto switched capacitor circuits, computation of any unitary 2-D transform that is separable into inner and outer products is possible. This includes the Walsh, Hadamard and Haar basis functions. This scheme offers several advantages including multiresolution imaging, inherent de-noising, compressive sampling and lower integration voltage and faster readout. The chip was implemented on a 0:5µm CMOS process and measures 9mm 2  in MOSIS' submicron design rules.
['Yu M. Chi', 'Adeel Abbas', 'Shantanu Chakrabartty', 'Gert Cauwenberghs']
An Active Pixel CMOS separable transform image sensor