Abstract: A hidden image method comprising forming a set of carrier devices which when overlayed upon one another and aligned will reveal N images within a common area, the set of carrier devices being formed by: forming N latent images from respective ones of the N images and respective ones of N line decoders to hide the N images, each latent image being decodeable by the decoder from which the latent image is formed to reveal the image the latent image hides, the N latent images further formed such that the lines of the decoders cross one another within the common area at line angles displaced relative to one another so as to define a single axis of alignment; and forming each carrier device of the set of carrier devices by combining at least two items selected from the set of latent images and decoders so as not to decode any of the hidden images and such that the set of carrier devices includes all the latent images and all the decoders, whereby the set of carrier devices will reveal the N hidden images within the

Abstract: A hidden image method comprising: obtaining a first image and a second image, the first and second images providing between them a hidden image and a decoder such that a hidden image is decoded by the decoder when the first image and the second image are superposed at least one decoding position; printing the first image onto a light transmissive substrate to produce a printed substrate; displaying the second image on an electronic display; and superposing the printed substrate relative to the display at a decoding position to decode the hidden image.

Abstract: A hidden image method comprising forming a set of carrier devices which when overlayed upon one another and aligned will reveal N images within a common area, the set of carrier devices being formed by: forming N latent images from respective ones of the N images and respective ones of N line decoders to hide the N images, each latent image being decodeable by the decoder from which the latent image is formed to reveal the image the latent image hides, the N latent images further formed such that the lines of the decoders cross one another within the common area at line angles displaced relative to one another so as to define a single axis of alignment; and forming each carrier device of the set of carrier devices by combining at least two items selected from the set of latent images and decoders so as not to decode any of the hidden images and such that the set of carrier devices includes all the latent images and all the decoders, whereby the set of carrier devices will reveal the N hidden images within the

Abstract: There is disclosed a method of encoding a latent image. The method comprises providing a latent image to be encoded, the latent image having a plurality of latent image elements, each latent image element having a visual characteristic which takes one of a predetermined set of values, providing a secondary pattern having a plurality of secondary image elements, the secondary pattern being capable of decoding the latent image once the latent image has been encoded, relating the latent image elements to the secondary image elements, and forming a primary pattern comprising a plurality of primary image elements which correspond to the secondary image elements displaced in accordance with the value of the visual characteristic of the latent image elements to which said secondary image elements are related.

Abstract: There is disclosed a method of forming a securitized image comprising: obtaining a host image which is to be visible to an observer, obtaining a latent image to be concealed within the host image, adjusting the saturation of regions of at least one of the host image and the latent image such that when the latent image and the host image as adjusted are subsequently combined, the saturation of the combined regions will more closely approximate the saturation of corresponding regions of the original host image; and combining the latent image, and host image as adjusted to form a securitized image.