Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
461675 | Journal of Systems and Software | 2013 | 17 Pages |
This paper deals with a method to protect the color information of images by providing free access to the corresponding gray level images. Only with a secret key and the gray level images, it is then possible to view the images in color. The approach is based on a color reordering algorithm after a quantization step. Based on a layer scanning algorithm, the color reordering generates gray level images and makes it possible to embed the color palette into the gray level images using a data hiding algorithm. This work was carried out in the framework of a project aimed at providing limited access to the private digital painting database of the Louvre Museum in Paris, France.
► We propose to hide color information in a grey level image. ► We propose a color reordering algorithm (the layer scanning algorithm). ► We improve the gray-levels images by reducing the number of quantized colors. ► We analyze the results as a function of the number of colors, and as a function of the size of the layer. ► We compare our results with the approach of De Queiroz and Braun, and that of Campisi et al.