1. A system for use in the object reconstruction, the system comprising: (a) an illuminating unit, comprising a coherent light source and a generator of a random speckle pattern accommodated in the optical path of illuminating light propagating from the light source towards an object, thereby projecting onto the object a coherent random speckle pattern; and (b) an imaging unit for detecting a light response of an illuminated region and generating image data, the image data being indicative of the object with the projected speckles pattern and thus indicative of a shift of the pattern in the image of the object relative to a reference image of said pattern, the system thereby enabling real-time reconstruction of a three-dimensional map of the object.