Method And Apparatus For Compressive Imaging Device Having Startle Reflex

Abstract

A method and apparatus for new digital image/video camera that directly acquires random projections of the incident light field without first collecting the pixels/voxels and has a startle reflex. The startle reflex is achieved by collecting a training set of samples while operating the imaging device at the low sampling rate, computing an empirical probability distribution of the training set of samples, collecting a testing set of samples while operating the imaging device at the low sampling rate, computing an empirical probability distribution of the testing set of samples, computing an empirical entropy test statistic, and capturing an image at the high sampling rate in response to the computed empirical entropy statistic exceeding a threshold.

1 . A method for power management in an imaging device having a low sampling rate and a high sampling rate, the method comprising the steps of:
 collecting a training set of samples while operating said imaging device at said low sampling rate;   computing an empirical probability distribution of said training set of samples;   collecting a testing set of samples while operating said imaging device at said low sampling rate;   computing an empirical probability distribution of said testing set of samples;   computing an empirical test statistic; and   capturing an image at said high sampling rate in response to said computed empirical test statistic exceeding a threshold.   
     
     
         2 . A method for power management in an imaging device having a low sampling rate and a high sampling rate in accordance with  claim 1 , wherein said empirical test statistic comprises an empirical entropy test statistic. 
     
     
         3 . A method for power management in an imaging device having a low sampling rate and a high sampling rate in accordance with  claim 1 , wherein said empirical test statistic comprises an parametric test statistic. 
     
     
         4 . A method for power management in an imaging device having a low sampling rate and a high sampling rate in accordance with  claim 1 , further comprising the step of replacing said training set of samples with said testing set of samples. 
     
     
         5 . A method for power management in an imaging device having a low sampling rate and a high sampling rate in accordance with  claim 1 , further comprising the step of forming a new training sample by concatenating said training sample with said testing sample. 
     
     
         6 . A method for power management in an imaging device having a low sampling rate and a high sampling rate according to  claim 1 , wherein
 said step of collecting a training set of samples comprises collecting S samples of a sequential measurement vector y, quantized to B bits per measurement;   said step of collecting a testing set of samples comprises collecting the next S samples of y; and   said step of capturing an image at said high sampling rate in response to said computed empirical entropy statistic exceeding a threshold comprises increasing said imaging device to said high sampling rate and capturing an image   
     
     
         7 . A method for power management in an imaging device having a low sampling rate and a high sampling rate according to  claim 6 , wherein S=30 samples. 
     
     
         8 . A method for power management in an imaging device having a low sampling rate and a high sampling rate according to  claim 6 , wherein y has 6 coefficients. 
     
     
         9 . A method for power management in an imaging device having a low sampling rate and a high sampling rate according to  claim 6 , wherein B=3 bits. 
     
     
         10 . A method for power management in an imaging device, said imaging device having a lens, a sensor element, and an analog-to-digital converter connected to said sensor element and having a low sampling rate and a high sampling rate, the method comprising the steps of:
 collecting a training set of samples at the output of said analog-to-digital converter while operating said imaging device at said low sampling rate;   computing an empirical probability distribution of said training set of samples;   collecting a testing set of samples at the output of said analog-to-digital converter while operating said imaging device at said low sampling rate;   computing an empirical probability distribution of said testing set of samples;   computing an empirical test statistic; and   capturing an image at said high sampling rate in response to said computed empirical entropy statistic exceeding a threshold.   
     
     
         11 . An imaging device comprising:
 a lens;   a modulator;   a sensor element, said sensor element producing a voltage that corresponds to a measurement;   an analog-to-digital converter for quantizing said voltage;   means for collecting a training set of samples while operating said imaging device at said low sampling rate;   means for computing an empirical probability distribution of said training set of samples;   means for collecting a testing set of samples while operating said imaging device at said low sampling rate;   means for computing an empirical probability distribution of said testing set of samples;   means for computing an empirical test statistic; and   means for capturing an image at said high sampling rate in response to said computed empirical entropy statistic exceeding a threshold.   
     
     
         12 . An imaging device according to  claim 11 , further comprising:
 a reconstruction means for reconstructing an image based upon a bitstream received from said analog-to-digital converter.   
     
     
         13 . An imaging device according to  claim 11 , further comprising:
 a digital micromirror device array.   
     
     
         14 . An imaging device according to  claim 13 , wherein said modulator comprises means for modulating mirror orientations of said digital micromirror device array in an incoherent pattern sequence. 
     
     
         15 . An imaging device according to  claim 14 , further comprising a pattern generator for supplying incoherent patterns to said means for modulating.