FIELD: information technology.
SUBSTANCE: compressed hierarchical representation, which is used to reconstruct a "visually lossless" version of image data, is stored at a server. The compressed hierarchical representation is decomposed from the image data using a wavelet transform with floating point kernels, to generate coefficients. The server also stores residual data that permit reconstructing the full fidelity version of the image data from the visually lossless version. The client requests compressed coefficients to reconstruct a visually lossless version of portions of the image data, and the server transfers compressed coefficients specified in the request. To generate a full fidelity image, the client upgrades the visually lossless version of the image to a full fidelity image using the residual data.
EFFECT: efficient transmission of source data from a server to at least one client.
22 cl, 13 dwg
