1. A color image pick-up apparatus comprising: a substantially planar array of solid state light-sensitive elements; a filter mosaic made up of individual filter elements which are superposed in one-to-one registry on said light-sensitive elements, said mosaic being comprised of a first type of element sensitive to a spectral region corresponding to luminance and associated with the color green, a second type of element sensitive to one spectral region corresponding to chrominance and associated with the color red, and third type of element sensitive to a different spectral region corresponding to chrominance and associated with the color blue, the three types of elements occurring in repeating patterns which are such that over at least a major portion of said array luminance-type elements occur at every other element position along both of two orthogonal directions of said array; separating means for separating said signals associated with red, green, and blue from the output signal of said solid state image pick-up device; extracting means for extracting a high frequency component from said signal corresponding to luminance and associated with green; means for adding said high frequency component signal corresponding to luminance and associated with green to the signal corresponding to luminance produced from the adjacent horizontal element of said solid state light-sensitive element; and color encoder means, connected to said separating means and adding means, for producing color video signals from the signals corresponding to said luminance and chrominance.