Secret fragment visible mosaic image

The aim of this project is to build a mosaic image which can hide the information of a given image. Even though small blocks of the given image are visible in the created mosaic picture, but the placement of these blocks is so random in the mosaic picture that it is hard to visualize how would the original image look like. Thus, the name Secret fragment visible Mosaic picture. The given original image divides into smaller tiles of images and these tiles are rearranged to become the final carrier image looking like a mosaic picture, giving an effect of encrypting the image secretly. The mosaic picture requires taking the RGB characteristics of the given original image and they are into a new one-dimensional color scale which is used for further processing the given original image. A carrier image from a database is selected which normally is most alike to the given original image i.e., original image using the one-dimensional color scale defined earlier. To find a tile image in the given original image which is the most similar to a block of the carrier image, a search algorithm is used. The similarity measure is calculated using the one-dimensional color scale in a mathematical formula. Then the target blocks are replaced by the most alike tile images in the original image, thus creating a preliminary mosaic picture. The tile fitting information is watermarked in the entire mosaic picture created using LSB replacement technique. Then this mosaic picture is taken as the final mosaic picture. The original given picture is retrieved with regard to the final mosaic picture using a secret key.