CA2324242A1 - Dark current and defective pixel correction apparatus - Google Patents
Dark current and defective pixel correction apparatus Download PDFInfo
- Publication number
- CA2324242A1 CA2324242A1 CA002324242A CA2324242A CA2324242A1 CA 2324242 A1 CA2324242 A1 CA 2324242A1 CA 002324242 A CA002324242 A CA 002324242A CA 2324242 A CA2324242 A CA 2324242A CA 2324242 A1 CA2324242 A1 CA 2324242A1
- Authority
- CA
- Canada
- Prior art keywords
- dark current
- signal
- current correction
- output signal
- correction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
A dark current correction apparatus eliminates a dark current signal component or components from an output signal of an imaging device having an array of pixels. The apparatus includes an A/D converter for digitizing the output signal, and a memory for storing level data of the digitized signal while exposure of the imaging device is controlled to be at a zero level or a uniformly illuminated level, according to whether dark current correction or white current correction, respectively, is to be performed. A dark current correction signal former generates a dark current correction signal or signals from data read out from the memory. The dark current correction signal or signals are applied to a correction circuit which processes an output signal produced by the imaging device during normal imaging operation in accordance with the correction signal or signals in order to eliminate the dark current signal component or components from that output signal.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2059968A JP2754842B2 (en) | 1990-03-13 | 1990-03-13 | Shading correction circuit |
| JP059968/90 | 1990-03-13 | ||
| JP059970/90 | 1990-03-13 | ||
| JP2059970A JP2805101B2 (en) | 1990-03-13 | 1990-03-13 | Shading correction circuit |
| CA002038096A CA2038096C (en) | 1990-03-13 | 1991-03-12 | Dark current and defective pixel correction apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002038096A Division CA2038096C (en) | 1990-03-13 | 1991-03-12 | Dark current and defective pixel correction apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2324242A1 true CA2324242A1 (en) | 1991-09-14 |
| CA2324242C CA2324242C (en) | 2001-12-11 |
Family
ID=27168877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002324242A Expired - Fee Related CA2324242C (en) | 1990-03-13 | 1991-03-12 | Dark current and defective pixel correction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2324242C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2397959B (en) * | 2002-11-06 | 2006-11-15 | Univ Surrey | Imaging system for use in radiography |
| US7372484B2 (en) | 2003-06-26 | 2008-05-13 | Micron Technology, Inc. | Method and apparatus for reducing effects of dark current and defective pixels in an imaging device |
-
1991
- 1991-03-12 CA CA002324242A patent/CA2324242C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2397959B (en) * | 2002-11-06 | 2006-11-15 | Univ Surrey | Imaging system for use in radiography |
| US7372484B2 (en) | 2003-06-26 | 2008-05-13 | Micron Technology, Inc. | Method and apparatus for reducing effects of dark current and defective pixels in an imaging device |
| US7733392B2 (en) | 2003-06-26 | 2010-06-08 | Micron Technology, Inc. | Method and apparatus for reducing effects of dark current and defective pixels in an imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2324242C (en) | 2001-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |