Conditional replenishment for motion JPEG2000

A method of receiving a current image of a sequence of digital images, comprising the steps of:

• with each image of the sequence being encoded in a multi-resolution format and each resolution comprising a set of non-independent elementary entities, the non-independent elementary entities of a given image being non-independent in that one is reconstructible only using another, receiving a plurality of parts of the non-independent elementary entities of the current image;
• determining a first set of elementary entities of the current image among the elementary entities received corresponding to at least one spatial entity of the current image which is moving with respect to a reference image stored beforehand;
• decoding the set of elementary entities received so as to reconstruct the at least one moving spatial entity;
• and
• storing the result of the decoding in a storage space containing the reference image, as a replacement for the image signal relating to the at least one spatial entity of the reference image of the position thus determined,
• wherein the images are transmitted in accordance with a transmission protocol associated with the encoding format, and wherein said step of determining a first set of elementary entities corresponding to at least one moving spatial entity comprises reading an auxiliary information item transmitted in accordance with the transmission protocol.

A device for transmitting a current image of a sequence of digital images between a server device and a client device which are connected by a communication network, each image of the sequence being encoded in a multi-resolution format, each resolution comprising a set of non-independent elementary entities, comprising:

• means for detecting motion on the current image, each image of the sequence being encoded in a multi-resolution format and each resolution comprising a set of non-independent elementary entities, the non-independent elementary entities of a given image being non-independent in that one is reconstructible only using another, the detecting being carried out on spatial entities defined with respect to the non-independent elementary entities, between the current image and a reference image;
• means for, in cases in which at least one moving spatial entity is detected in the current image,
• determining a first set of elementary entities of the current image comprising the elementary entities relating to the at least one moving spatial entity;
• determining a second set of elementary entities of the current image which are necessary for reconstructing the at least one moving spatial entity of the current image;
• and
• sending to the client device at least part of each of the elementary entities of the first and second sets;
• and
• means for sending to the client device an auxiliary information item which indicates the elementary entities of the first set.

A device for receiving a current image of a sequence of digital images, each image of the sequence being encoded in a multi-resolution format, each resolution comprising a set of non-independent elementary entities, said device comprising:

• means for, with each image of the sequence being encoded in a multi-resolution format and each resolution comprising a set of non-independent elementary entities, the non-independent elementary entities of a given image being non-independent in that one is reconstructible only using another, receiving a plurality of parts of the non-independent elementary entities of the current image;
• means for determining a first set of elementary entities of the current image among the elementary entities received corresponding to at least one spatial entity of the current image which is moving with respect to a reference image stored beforehand;
• means for decoding the set of elementary entities received so as to reconstruct the at least one moving spatial entity;
• and
• means for storing the result of the decoding in a storage space containing the reference image, as a replacement for the image signal relating to the at least one spatial entity of the reference image of the position thus determined,
• wherein the images are transmitted in accordance with a transmission protocol associated with the encoding format, and wherein said means for determining a first set of elementary entities corresponding to at least one moving spatial entity are capable of reading an auxiliary information item transmitted in accordance with the transmission protocol.