An apparatus comprising: a digital image sensor having an overall field of view and comprising: a sensor layer comprising an array of light sensitive pixels; a mask layer in front of the sensor layer, the mask layer comprising an array of micro apertures positioned within aperture sites corresponding the positioning and size of the light sensitive pixels; a lens layer comprising an array of micro lenses in front of the mask layer, the micro lenses being positioned within lens sites corresponding the positioning and size of the light sensitive pixels; and a pixel of the sensor layer having a partial field of view defined by a micro aperture and a micro lens associated with the pixel, the partial field of view having a direction of view defined by relative horizontal position of the associated micro aperture in relation to the corresponding micro lens, the overall field of view of the digital image sensor being formed by the partial fields of view of the pixels, the micro apertures being positioned in the aperture sites at aperture positions that are mathematically defined by an aperture density function defining a two-directional pseudo random sequence of aperture positions; and a processing unit configured to: obtain preliminary image data which is image data of a preliminary digital image frame captured of an object scene by the digital image sensor; obtain the aperture density function; obtain a position difference between a measured positioning of the mask layer in relation to the lens layer from a reference relative position; and reconstruct, an output digital image frame representing the object scene by pixel mapping the preliminary image data with a correlation operator that takes into account the position difference and the aperture density function. a digital image sensor having an overall field of view and comprising: a sensor layer comprising an array of light sensitive pixels; a mask layer in front of the sensor layer, the mask layer comprising an array of micro apertures positioned within aperture sites corresponding the positioning and size of the light sensitive pixels; a lens layer comprising an array of micro lenses in front of the mask layer, the micro lenses being positioned within lens sites corresponding the positioning and size of the light sensitive pixels; and a pixel of the sensor layer having a partial field of view defined by a micro aperture and a micro lens associated with the pixel, the partial field of view having a direction of view defined by relative horizontal position of the associated micro aperture in relation to the corresponding micro lens, the overall field of view of the digital image sensor being formed by the partial fields of view of the pixels, the micro apertures being positioned in the aperture sites at aperture positions that are mathematically defined by an aperture density function defining a two-directional pseudo random sequence of aperture positions; and a sensor layer comprising an array of light sensitive pixels; a mask layer in front of the sensor layer, the mask layer comprising an array of micro apertures positioned within aperture sites corresponding the positioning and size of the light sensitive pixels; a lens layer comprising an array of micro lenses in front of the mask layer, the micro lenses being positioned within lens sites corresponding the positioning and size of the light sensitive pixels; and a pixel of the sensor layer having a partial field of view defined by a micro aperture and a micro lens associated with the pixel, the partial field of view having a direction of view defined by relative horizontal position of the associated micro aperture in relation to the corresponding micro lens, the overall field of view of the digital image sensor being formed by the partial fields of view of the pixels, the micro apertures being positioned in the aperture sites at aperture positions that are mathematically defined by an aperture density function defining a two-directional pseudo random sequence of aperture positions; and a processing unit configured to: obtain preliminary image data which is image data of a preliminary digital image frame captured of an object scene by the digital image sensor; obtain the aperture density function; obtain a position difference between a measured positioning of the mask layer in relation to the lens layer from a reference relative position; and reconstruct, an output digital image frame representing the object scene by pixel mapping the preliminary image data with a correlation operator that takes into account the position difference and the aperture density function. obtain preliminary image data which is image data of a preliminary digital image frame captured of an object scene by the digital image sensor; obtain the aperture density function; obtain a position difference between a measured positioning of the mask layer in relation to the lens layer from a reference relative position; and reconstruct, an output digital image frame representing the object scene by pixel mapping the preliminary image data with a correlation operator that takes into account the position difference and the aperture density function.