Max entropy optimized retinal camera
US7433532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2003 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Mar 15, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An enhanced entropy camera provides enhanced image quality by utilizing a custom analog-to-digital conversion function. The analog-to-digital conversion occurs according to a custom non-linear quantization function that provides enhanced entropy in the digitized image, yet avoids the harsh artifacts that tend to arise in images quantized according to a maximum entropy function. A plurality of custom non-linear functions are made available for selection depending upon imaging conditions, such as light intensity, pigmentation of the retina, or the part of the retina being imaged. Each of the plural non-linear quantization function comprises a distinct non-linear look up table for each of plural bands (e.g., red, green, and blue color channels).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.