Gigapixel Binary Sensing: Image Acquisition Using Oversampled One-Bit Poisson Statistics

We study a new gigapixel image sensor that is reminiscent of traditional photographic film. Each pixel in the sensor has a binary response, giving only a one-bit quantized measurement of the local light intensity. To analyze its performance, we formulate the oversampled binary sensing scheme as a parameter estimation problem based on quantized Poisson statistics. We show that, with a single-photon quantization threshold and large oversampling factors, the Cram´er-Rao lower bound (CRLB) of the estimation variance approaches that of an ideal unquantized sensor, that is, as if there were no quantization in the sensor measurements. Furthermore, the CRLB is shown to be asymptotically achievable by the maximum likelihood estimator (MLE). By showing that the log-likelihood function of our problem is concave, we guarantee the global optimality of iterative algorithms in finding the MLE. Numerical results on both synthetic data and images taken by a prototype sensor verify our theoretical a...

• Type: Journal
• Year: 2011
• Where: CORR
• Authors: Feng Yang, Yue M. Lu, Luciano Sbaiz, Martin Vetterli
• Keywords: Binary Sensing Scheme, CORR 2011, Education, Oversampled Binary Sensing, Sensor