EP 1559072 A2 20050803 - IN-STREAM LOSSLESS COMPRESSION OF DIGITAL IMAGE SENSOR DATA
Title (en)
IN-STREAM LOSSLESS COMPRESSION OF DIGITAL IMAGE SENSOR DATA
Title (de)
VERLUSTLOSE IN-STREAM-KOMPRIMIERUNGDIGITALER BILDSENSORDATEN
Title (fr)
COMPRESSION SANS PERTE DU FLOT DES TRAVAUX DE DONNEES D'UN CAPTEUR D'IMAGES NUMERIQUES
Publication
Application
Priority
- US 0332220 W 20031014
- US 41798202 P 20021011
Abstract (en)
[origin: WO2004034331A2] A method and system provide in-stream compression of bytes of digital image sensor data. A specified number of least significant bits of the byte of digital image sensor data is masked or dropped (54 of Figure 5) to reduce the amount of image data if a frame of image data. After masking, alternate bytes of digital image sensor data are subtracted to produce and entropy-reduced data model (56 & 64 of Figure 5). The difference bytes of digital image sensor data are split into a predetermined number of channels (65 of Figure 5), each channel having a bit width such that the sum of he bit widths of each channel equals a bit width of the byte of digital image sensor data. Each channel is operated upon by a distinct cumulative distribution function (66, 68, and 70 of Figure 5) before being multiplexed (72 of Figure 5). The multiplexed digital image sensor data is encoded by arithmetic compression encoding (74 of Figure 5). The method and system also utilize a division-free method of arithmetic encoding to simplify the hardware requirements of encoding. Lastly, the method and system utilize a round-robin removal approach for adaptively fixing a number of elements in a histogram.
IPC 1-7
IPC 8 full level
G06T 9/00 (2006.01); H01L 27/146 (2006.01); H04N 7/26 (2006.01)
CPC (source: EP)
G06T 9/00 (2013.01); H01L 27/14623 (2013.01); H01L 27/14627 (2013.01); H01L 27/14645 (2013.01); H01L 27/14667 (2013.01); H04N 19/37 (2014.11); H04N 19/423 (2014.11)
Citation (search report)
See references of WO 2004034331A2
Citation (examination)
- US 2002135683 A1 20020926 - TAMAMA HIDEO [JP], et al
- WO 02071622 A2 20020912 - KONINKL PHILIPS ELECTRONICS NV [NL], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004034331 A2 20040422; WO 2004034331 A3 20041202; WO 2004034331 A9 20040610; AU 2003284067 A1 20040504; EP 1559072 A2 20050803; JP 2006502673 A 20060119
DOCDB simple family (application)
US 0332220 W 20031014; AU 2003284067 A 20031014; EP 03776298 A 20031014; JP 2004543695 A 20031014