Patent ID: 7515711
Filing Date: 2009-04-07
Classification: H04N

Abstract:
1. An image encrypting method comprising steps of: (a) inputting compressed image data which has been compressed using a wavelet conversion; (b) designating, from among a plurality of compression domains of a compression process, one of the plurality of compression domains, wherein each of the plurality of compression domains corresponds to a codestream, entropy-encoded data, quantized data, discrete-wavelet data, and original image data, respectively; (c) generating decompressed image data by decompressing the compressed image data back to data corresponding to the designated compression domain of the compression process; (d) generating decompressed encrypted image data by encrypting the decompressed image data; (e) generating compressed encrypted image data by compressing the decompressed encrypted image data by executing processes following on a process corresponding to the designated compression domain; and (f) storing information representing the designated compression domain in a predetermined area of the compressed encrypted image data.