Digital Image Processing
Color to gray and back: color embedding into textured gray images
IEEE Transactions on Image Processing
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This paper proposes an improved reversible color to textured gray image mapping. The method was originally devised using the wavelet transform, where high-frequency subbands are replaced by subsampled chrominance plane. The problem with this method was lower Peak Signal to Noise Ratio (PSNR). Proposed method is an attempt to improve the original method by embedding the content of both horizontal and vertical subbands into diagonal subbands and making a place to embed Cb and Cr chrominance planes. To embed two subbands into one we have used two dimensional Discrete Cosine Transform (2D-DCT). Our aim is to reduce the loss in subband replacement. The experimental results shows that we have achieved higher PSNR, almost up to 2--3 dB gain compared to the original method. This makes the proposed method a good candidate for application that needs to preserve the original color fidelity and sharpness.