Reducing smear through digital cancellation in image sensor
US11095839B1 · kind B1 · utility
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20Claims
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Key dates
| Filing date | Jun 19, 2020 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Jun 19, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus of reading out an image sensor having a plurality of pixels arranged in rows and columns includes a plurality of analog-to-digital converters (ADCs) configured to output digital codes representative of received pixel signals of pixels coupled to respective ADCs, and a smear cancellation circuit configured to determine an average value of the digital codes, multiply the average value by a factor to obtain an offset value, and subtract the offset value from the digital codes to obtain smear-cancelled digital codes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.