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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Fernandez-Berni, J. Carmona-Galan, R. Rodriguez-Vazquez, A. |
| Copyright Year | 2011 |
| Description | Author affiliation: Institute of Microelectronics of Seville (IMSE-CNM), CSIC-Universidad de Sevilla, C/ Américo Vespucio s/n, 41092, Spain (Fernandez-Berni, J.; Carmona-Galan, R.; Rodriguez-Vazquez, A.) |
| Abstract | Incorporating multi-resolution capabilities into imagers renders additional power saving mechanisms in the subsequent image processing. In this paper, we show how, by exploiting a certain mask structure, 3 × 3 kernels can be reduced to 2 × 2 kernels if charge redistribution is provided at the focal plane of the imaging device. More precisely, by averaging and shifting a half-resolution pixel grid, we will have a pre-processed image, subsampled by a factor of 2 on each dimension, that can be filtered with a mask of a reduced size. Very useful image filtering kernels, like a 3 × 3 Gaussian kernel for image smoothing, or the well-known Sobel operators, fall into this category of reducible kernels. Operating onto the pre-processed image with one of these reduced kernels represents a smaller number of operations per pixel than realizing all the multiply-accumulate operations needed to apply a 3 × 3 kernel. Memory accesses are reduced in the same fraction. Concerning the difficulties of providing this pre-processed image representation, we propose a methodology for obtaining it at a very low power cost. It requires the implementation of user definable image subdivision and subsampling at the focal plane. Experimental results are given, obtained from measurements on a CMOS imager prototype chip incorporating these multi-resolution capabilities. |
| Starting Page | 230 |
| Ending Page | 233 |
| File Size | 5842776 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781457706172 |
| e-ISBN | 9781457706189 |
| e-ISBN | 9781457706165 |
| DOI | 10.1109/ECCTD.2011.6043324 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-08-29 |
| Publisher Place | Sweden |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Image resolution Prototypes Registers Arrays System-on-a-chip Kernel |
| Content Type | Text |
| Resource Type | Article |
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