both the green and the chroma data must indicate a minimum of high spatial frequency information for a given orientation to be chosen as the preferred orientation for the interpolation if there is a large amount of high spatial frequency information in either the green data or chroma data for a given orientation it will inflate the value of the corresponding classifier value this in turn reduces the likelihood for that orientation to be chosen as the preferred orientation for the interpolation in practice the case 3 chroma interpolation process may be simplified as below for computational efficiency ______________________________________ if dn lt dp a5 a5n else a5 a5p______________________________________ this simplification is achieved by defining the negative diagonal direction as the default preferred orientation for the interpolation when both negative and positive diagonal classifiers are equal the number of occurrences in a typical image when the negative and positive diagonal classifiers are equal is so small that this simplification generally has negligible impact on the image quality of the final reconstructed image the invention has been described in detail with particular reference to certain preferred embodiments thereof but it will be understood that variations and modifications can be effected within the spirit and scope of the invention ______________________________________parts list______________________________________ 2 input section 4 recording section10 exposure section12 image sensor13 color filter array14 output diode16 a d converter18 image buffer20 control processor22 digital signal processor24 removable memory card26 connector28 processing buffer30 display panel32 green pixel value averaging selection36 luminance section38 chroma section40 select best luma interpolation42 select luma pixel values to average43 replace selected luma pixel values.