Real-time multi-block lossless recompression

A system for recompressing previously compressed data, comprising:

• a processor;
• and
• memory coupled to the processor, the memory configured to store computer-readable code that, when executed by the processor, causes the processor to:
• separate a Joint Photographic Experts Group (JPEG) data stream into a plurality of data blocks including a JPEG header, the plurality of data blocks including an order and following the JPEG header;
• derive compression scheme information and block-image synchronization information from the JPEG header;
• access the plurality of data blocks;
• store the derived compression scheme information and block-image synchronization information in each of the plurality of data blocks;
• recompress the plurality of data blocks utilizing compression scheme information and block-image synchronization information, wherein:
• each subsequent input data block includes the compression scheme information and the block-image synchronization information from a previous input block, and
• access to the block-image synchronization information is initialized by the compression scheme information to generate a recompressed plurality of output data blocks;
• store the recompressed plurality of output data blocks;
• access, in a random order, each stored recompressed plurality of output data blocks such that the sluralit of output data blocks are not accessed in a natural sequence of the JPEG data stream;
• decompress each randomly accessed recompressed plurality of output data blocks to generate a subsequent plurality of output data blocks;
• and
• arrange each decompressed data block in the subsequent plurality of output data blocks in an order to re-establish the natural sequence of the JPEG data stream, wherein the order is re-established utilizing the compression scheme information and the block-image synchronization information from each respective previous input block.

A computer program product for recompressing previously compressed data by a processor, the computer program product including a non-transitory computer-readable storage medium comprising:

• computer code for separating a Joint Photographic Experts Group (JPEG) data stream into a plurality of data blocks including a JPEG header, the plurality of data blocks including an order and following the JPEG header;
• computer code for deriving compression scheme information and block-image synchronization information from the JPEG header;
• computer code for accessing the plurality of data blocks;
• computer code for storing the derived compression scheme information and block-image synchronization information in each of the plurality of data blocks;
• computer code for recompressing the plurality of data blocks utilizing information and block-image synchronization information, wherein:
• each subsequent input data block includes the compression scheme information and the block-image synchronization information from a previous input block, and
• access to the block-image synchronization information is initialized by the compression scheme information to generate a recompressed plurality of output data blocks;
• computer code for storing the recompressed plurality of output data blocks;
• computer code for accessing, in a random order, each stored recompressed plurality of output data blocks such that the plurality of output data blocks are not accessed in a natural sequence of the JPEG data stream;
• computer code for decompressing each randomly accessed recompressed plurality of output data blocks to generate a subsequent plurality of output data blocks;
• and
• computer code for arranging each decompressed data block in the subsequent plurality of output data blocks in an order to re-establish the natural sequence of the JPEG data stream, wherein the order is re-established utilizing the compression scheme information and the block-image synchronization information from each respective previous input block.