Title :
On-chip compression for HDR image sensors
Author :
Messaoud, Fadoua Guezzi ; Peizerat, Arnaud ; Dupret, Antoine ; Blanchard, Yves
Author_Institution :
LETI, CEA, Grenoble, France
Abstract :
An image compressing technique for High Dynamic Range (HDR) image sensors is introduced. Compression is performed in two steps: Pixel value coding optimization followed by DCT-based (Discrete Cosine Transform) compression. A floating point coding technique is first used with a common exponent shared between pixels of the same block, and then a DCT is applied to each group of pixels. This new concept, while maintaining low complexity architecture, shows a compression ratio of 75 % and retains a good image quality with a PSNR of about 40 dB.
Keywords :
CMOS image sensors; discrete cosine transforms; image coding; optimisation; DCT; HDR image sensors; discrete cosine transform; floating point coding technique; high dynamic range; image compression; optimization; pixel value coding; Discrete cosine transforms; Encoding; Image coding; Image reconstruction; Image sensors; PSNR; Pixel; 3D architecture; DCT; HDR image sensor; floating point coding; image compression; macro-pixel;
Conference_Titel :
Design and Architectures for Signal and Image Processing (DASIP), 2010 Conference on
Conference_Location :
Edinburgh
Print_ISBN :
978-1-4244-8734-9
Electronic_ISBN :
978-1-4244-8733-2
DOI :
10.1109/DASIP.2010.5706262
