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This paper introduces a new technique for image intensity bit-depth scaling for display devices. Conventional bit-depth scaling methods such as spatial 2D filtering and dithering algorithms suffer from false contours or dithered pattern artifacts, which significantly deteriorate image quality in display devices. In this paper, we propose spatio-temporal 3D adaptive noise shaping filter that does not produce visual annoyance in the reduced bit-resolution images. Experimental result shows that the proposed method effectively reduces the false contouring artifacts compared with the conventional methods.