Decreasing image acquisition time for compressive imaging devices

摘要

Mechanisms for increasing the rate of acquisition of compressed/encoded image representations are disclosed. An imaging system may deliver subsets of a modulated light stream onto respective light sensing devices. The light sensing devices may be sampled in parallel. Samples from each light sensing device may be used to construct a respective sub-image of a final image. The parallelism allows compressed images to be acquired at a higher rate. The number of light sensing devices and/or the number of pixels per image may be selected to achieve a target image acquisition rate. In another embodiment, spatial portions of the incident light stream are separated and delivered to separate light modulators. In yet another embodiment, the incident light stream is split into a plurality of beams, each of which retains the image present in the incident light stream and is delivered to a separate light modulator.

主权项

1. A system comprising:
a light modulation unit configured to modulate an incident stream of light with a sequence of spatial patterns in order to produce a modulated light stream, wherein the light modulation unit includes an array of light modulating elements; a plurality of light sensing devices; an optical subsystem configured to deliver light from each of a plurality of spatial subsets of the modulated light stream onto a respective one of the plurality of light sensing devices, wherein the spatial subsets of the modulated light stream are produced by respective subsets of the array of light modulating elements, wherein each subset of the array of light modulating elements produces the respective spatial subset of the modulated light stream by modulating a respective spatial subset of the incident light stream, wherein the light sensing devices are configured to generate respective electrical signals, wherein each of the electrical signals represents intensity of the respective spatial subset of the modulated light stream as a function of time; and a sampling subsystem configured to acquire samples of the electrical signals, wherein the samples include sample subsets that correspond respectively to the electrical signals, wherein each sample subset includes a plurality of samples of the respective electrical signal; wherein the sampling subsystem is configured to acquire the samples of the electrical signals in groups, wherein each of the groups includes at least one sample of each of the electrical signals, wherein each of the groups corresponds to a respective one of the spatial patterns; wherein said sampling subsystem is configured to acquire the groups of samples of the electrical signals at a maximum group rate of RG groups per unit time, wherein mSS is the number of samples in each sample subset, wherein N is the number of the light modulating elements, wherein n is less than or equal to N, wherein L is the number of the light sensing devices, wherein a number mn/L of the compressive sensing samples required to reconstruct an n/L-pixel image decreases as L increases, wherein L is selected so that mSS is greater than or equal to mn/L, and, mSS/RG is less than or equal to a target acquisition time.