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This paper presents a new method for performing combined demosaicking and watermarking (CDW). First, a mosaic image from a single-sensor digital camera is set as input. While an edge-directed interpolation is being performed, a new approach for watermarking is used simultaneously. Combining these two processes will lead in economizing in both time and power, which play a substantial role in digital camera pipeline. Implementations are done by MATLAB 7.3.0.