1. An imaging apparatus, said imaging apparatus comprising: at least one source of coherent radiation outputting a plurality of wavelengths illuminating an object creating a plurality of speckle patterns each corresponding to the plurality of wavelengths; at least one sensor at a location relative to said object to determine an intensity of the speckle pattern for each of the plurality of wavelengths; a processor receiving information from at least one sensor, said processor having means for constructing at least one autocorrelation of said object from said intensities of said speckle pattern; and said processor further comprising means to compare at least one of said at least one autocorrelation.