PROJECT TITLE :

Codebook Calibration Method for Vector Quantizers Implemented at the Focal Plane of CMOS Imagers

ABSTRACT:

We have recently designed and tested a CMOS imager fabricated in a very 0.35- CMOS technology, with focal-plane image compression using vector quantization (VQ) for texture illustration. In Lloyd-Max VQ style theory, the input house partition is matched to the codebook and vice versa, by means of well-known partition and centroid conditions. Although each the partition and codebook were designed with vectors extracted from the identical digital image base, only the partition is nonideally implemented, because of mismatches and errors made by the fabrication process. Whereas this paper does not have a specialise in hardware or system design, some hardware details are described, to illustrate the foremost vital error sources. During this paper, we have a tendency to introduce a methodology for updating the codebook as binary indices are experimentally generated by the camera, so that texture reconstruction with smaller mean squared error is consistently obtained. We illustrate the method by means of experiments administered with captured and improved pictures.