SE0102254L - Digital image processing - Google Patents
Digital image processingInfo
- Publication number
- SE0102254L SE0102254L SE0102254A SE0102254A SE0102254L SE 0102254 L SE0102254 L SE 0102254L SE 0102254 A SE0102254 A SE 0102254A SE 0102254 A SE0102254 A SE 0102254A SE 0102254 L SE0102254 L SE 0102254L
- Authority
- SE
- Sweden
- Prior art keywords
- digital image
- threshold
- subarea
- basis
- calculation unit
- Prior art date
Links
- 238000004364 calculation method Methods 0.000 abstract 3
- 239000011159 matrix material Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- 238000004590 computer program Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/50—Image enhancement or restoration using two or more images, e.g. averaging or subtraction
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/142—Image acquisition using hand-held instruments; Constructional details of the instruments
- G06V30/1423—Image acquisition using hand-held instruments; Constructional details of the instruments the instrument generating sequences of position coordinates corresponding to handwriting
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10048—Infrared image
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Multimedia (AREA)
- Image Analysis (AREA)
- Image Processing (AREA)
Abstract
In a method for identifying individual objects in a digital image (I), a device is used that comprises a theresholding unit (20) and a threshold calculation unit (21). the thresholding unit (20) is designed to receive the digital image (I) and compare the luminance values of the digital image with threshold values (Ti) of a threshold matrix (T) in order to create a binary image on the basis of the comparison. The threshold calculation unit (21) is designed to estimate, on the basis of a first and second division of a reference image which corresponds to the digital image (I) into first and second subareas, a background luminance value for each first subarea and an object luminance value for each second subarea. For each overlapping first and second subarea, the threshold calculation unit (21) calculates a threshold value (Ti) on the basis on the associated background and object luminancevalues, and creates the threshold matrix (T) from said threshold values (Ti). The device and the method permit quick and memory-efficient identification of the individual objects, even if the digital image (I) contains variations in luminance and/or sharpness. A computer program product, a hardware circuit and a hand-held apparatus for position determination are also described.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0102254A SE0102254L (en) | 2001-06-26 | 2001-06-26 | Digital image processing |
EP02741593A EP1421555A1 (en) | 2001-06-26 | 2002-06-25 | Processing of digital images |
PCT/SE2002/001244 WO2003001450A1 (en) | 2001-06-26 | 2002-06-25 | Processing of digital images |
US10/179,967 US7110604B2 (en) | 2001-06-26 | 2002-06-26 | Processing of digital images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0102254A SE0102254L (en) | 2001-06-26 | 2001-06-26 | Digital image processing |
Publications (2)
Publication Number | Publication Date |
---|---|
SE0102254D0 SE0102254D0 (en) | 2001-06-26 |
SE0102254L true SE0102254L (en) | 2002-12-27 |
Family
ID=20284605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE0102254A SE0102254L (en) | 2001-06-26 | 2001-06-26 | Digital image processing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1421555A1 (en) |
SE (1) | SE0102254L (en) |
WO (1) | WO2003001450A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7457476B2 (en) | 2001-10-03 | 2008-11-25 | Anoto Ab | Optical sensor device and a method of controlling its exposure time |
WO2008002239A1 (en) | 2006-06-28 | 2008-01-03 | Anoto Ab | Operation control and data processing in an electronic pen |
EP2064658A4 (en) | 2006-09-07 | 2017-08-23 | Lumex As | Relative threshold and use of edges in optical character recognition process |
CN116629289A (en) * | 2023-05-23 | 2023-08-22 | 深圳市牛加技术有限公司 | Optical lattice two-dimensional coordinate recognition method and device based on convolutional neural network |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4593325A (en) | 1984-08-20 | 1986-06-03 | The Mead Corporation | Adaptive threshold document duplication |
US5051736A (en) | 1989-06-28 | 1991-09-24 | International Business Machines Corporation | Optical stylus and passive digitizing tablet data input system |
US5477012A (en) | 1992-04-03 | 1995-12-19 | Sekendur; Oral F. | Optical position determination |
US5852434A (en) | 1992-04-03 | 1998-12-22 | Sekendur; Oral F. | Absolute optical position determination |
US5661506A (en) | 1994-11-10 | 1997-08-26 | Sia Technology Corporation | Pen and paper information recording system using an imaging pen |
US5629780A (en) * | 1994-12-19 | 1997-05-13 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Image data compression having minimum perceptual error |
US5963676A (en) * | 1997-02-07 | 1999-10-05 | Siemens Corporate Research, Inc. | Multiscale adaptive system for enhancement of an image in X-ray angiography |
FR2786011B1 (en) * | 1998-11-13 | 2001-01-19 | Centre Nat Etd Spatiales | METHOD OF COMPARISON OF RECORDED IMAGES SHAPED OF PIXELS REPRESENTING EQUIPOTENTIALS OF AT LEAST ONE INTEGRATED CIRCUIT CHIP |
ATE469390T1 (en) | 1999-05-28 | 2010-06-15 | Anoto Ab | POSITION DETERMINATION |
-
2001
- 2001-06-26 SE SE0102254A patent/SE0102254L/en not_active Application Discontinuation
-
2002
- 2002-06-25 EP EP02741593A patent/EP1421555A1/en not_active Withdrawn
- 2002-06-25 WO PCT/SE2002/001244 patent/WO2003001450A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
SE0102254D0 (en) | 2001-06-26 |
EP1421555A1 (en) | 2004-05-26 |
WO2003001450A1 (en) | 2003-01-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |