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With the emergence of large arrays of high-functionality pixels, it has become critical to characterize the performance non-uniformity of such arrays. In this paper we characterize a 160×128 array of complex pixels, each with a single-photon avalanche diode (SPAD) and a time-to-digital converter (TDC). A study of the array's non-uniformities in terms of the timing resolution, jitter, and photon responsivity...
In this paper, we present an array of 160x128 pixels capable of detecting the ToA of single photons, implemented in 0.13μm CMOS technology. The sensor is partitioned into 4 identical quadrants that are served by a balanced clock tree so as to minimize skews and to ensure the fastest possible readout process. The pixels in the rows are read out in rolling shutter mode in two directions (top and bottom)...
A good object representation or object descriptor is one of the key issues in object based image analysis. To effectively fuse color and texture as a unified descriptor at object level, this paper presents a novel method for feature fusion. Color histogram and the uniform local binary patterns are extracted from arbitrary-shaped image-objects, and kernel principal component analysis (kernel PCA) is...
We report the design and characterisation of a 32times32 time to digital (TDC) converter plus single photon avalanche diode (SPAD) pixel array implemented in a 130 nm imaging process. Based on a gated ring oscillator approach, the 10 bit, 50 mum pitch TDC array exhibits a minimum time resolution of 50 ps, with accuracy of plusmn0.5 LSB DNL and 2.4 LSB INL. Process, voltage and temperature compensation...
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