Super-resolving-extended depth of field imaging system encoded by speckle pattern

Abstract

In conventional imaging systems, resolution and depth of field cannot be increased independently. In such systems increased resolution decreases the depth of field (DOF). Hereby we present a novel approach that combines super resolution beyond the classical limit, while extending the DOF simultaneously. It is based on a novel approach proposed by Garcia et al 10 , shown to increase the resolution significantly. In their method, the object is multiplied by a moving speckle pattern, and then imaged by a low resolution imaging system. The acquired low resolution image is then electronically multiplied by a spatially synchronized perfect image of the same speckle to provide a high resolution image. In our approach, an object illuminated by a fine speckle pattern may be located anywhere along an extended DOF region. The imaging system cannot resolve the object's finest details, nor the fine speckle pattern. The acquired low resolution image obtained with a moving speckle pattern is electronically multiplied by the same high resolution synchronized moving speckle to finally produce a high resolution image insensitive to aberrations as well as DOF variations. Simulation results are presented.