1. An apparatus for correcting of at least one defect pixel value of an image sensor unit, the image sensor unit comprising at least a first and a second pixel array, wherein the image sensor unit is arranged to project representations of substantially the same image onto each pixel array, the apparatus comprising: at least a first and a second input channel for receiving pixel values of at least the first and second pixel array, respectively, wherein the apparatus is operable to replace a defect pixel value of the first pixel array with a corrected pixel value, wherein the apparatus is operable to determine a set of candidate pixel values from the values of neighboring pixels to the defect pixel of the first pixel array by means of directional interpolation operations, the directional interpolation operations being performed along lines that are arranged in a vertical, horizontal first diagonal and/or second diagonal direction, wherein the apparatus is further operable to determine, for each one of the set of candidate pixel values, and in corresponding parallel or congruent interpolation directions, confidence values from values of a corresponding pixel and its neighboring pixels of the second pixel array at the same pixel location as the defect pixel of the first pixel array with respect to the projected image, wherein the apparatus is further adapted to combine the candidate values to a corrected pixel value in a weighted manner in dependence on the corresponding confidence values.