Papers Published
- Pitsianis, Nikos P. and Brady, David J. and Sun, Xiaobai, Sensor-layer image compression based on the quantized cosine transform,
Proceedings of SPIE - The International Society for Optical Engineering, vol. 5817
(2005),
pp. 250 - 257 [12.604921] .
(last updated on 2007/04/11)Abstract:
We introduce a novel approach for compressive coding at the sensor layer for an integrated imaging system. Compression at the physical layer reduces the measurements-to-pixels ratio and the data volume for storage and transmission, without confounding image estimation or analysis. We introduce a particular compressive coding scheme based on the quantized Cosine transform (QCT) and the corresponding image reconstruction scheme. The QCT is restricted on the ternary set {-1, 0, 1} for economic implementation with a focal plane optical pixel mask. Combined with the reconstruction scheme, the QCT-based coding is shown favorable over existing coding schemes from the coded aperture literature, in terms of both reconstruction quality and photon efficiency.Keywords:
Image sensors;Vector quantization;Cosine transforms;Imaging systems;Image quality;