JPS5471951A - Binary threshold setting method for picture density - Google Patents
Binary threshold setting method for picture densityInfo
- Publication number
- JPS5471951A JPS5471951A JP13888577A JP13888577A JPS5471951A JP S5471951 A JPS5471951 A JP S5471951A JP 13888577 A JP13888577 A JP 13888577A JP 13888577 A JP13888577 A JP 13888577A JP S5471951 A JPS5471951 A JP S5471951A
- Authority
- JP
- Japan
- Prior art keywords
- picture
- density
- threshold
- binary threshold
- picture elements
- 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
Landscapes
- Character Input (AREA)
Abstract
PURPOSE: To reproduce accurately features of an objective picture by generating a histogram curve of frequency for density of all picture elements and detecting inflection points and correcting the threshold of a white background or a black background to determine a binary threshold.
CONSTITUTION: An objective picture is divided into required picture elements, and the density level of each picture element is shown by one of plural digital values "1"..."9". Next, the density of picture elements N(i), (i=1...8), which are adjacent to noticing picture element Px in front, back, right, left and oblique directions, and the density of noticing picture element Px are compared with each other to detect, for example, Px≥N(i) and the average. This operation is performed for all picture elements to generate a histogram curve of frequency for density, and inflection points are detected to correct the threshold of a white back-ground or a black background, thereby determining a binary threshold. As a result, features of the objective picture can be accurately reproduced.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13888577A JPS5471951A (en) | 1977-11-21 | 1977-11-21 | Binary threshold setting method for picture density |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13888577A JPS5471951A (en) | 1977-11-21 | 1977-11-21 | Binary threshold setting method for picture density |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5471951A true JPS5471951A (en) | 1979-06-08 |
JPS5646188B2 JPS5646188B2 (en) | 1981-10-31 |
Family
ID=15232382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13888577A Granted JPS5471951A (en) | 1977-11-21 | 1977-11-21 | Binary threshold setting method for picture density |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5471951A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827278A (en) * | 1981-08-10 | 1983-02-17 | Toshiba Corp | Line searching system |
JPS5827275A (en) * | 1981-08-10 | 1983-02-17 | Toshiba Corp | Address controlling system for pattern memory |
JPS5999584A (en) * | 1982-11-30 | 1984-06-08 | Toshiba Corp | Determining device of optimum binary reference voltage |
JPH05101732A (en) * | 1991-10-04 | 1993-04-23 | Nitto Denko Corp | Method for forming conductive layer on epoxy resin insulating mold |
-
1977
- 1977-11-21 JP JP13888577A patent/JPS5471951A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827278A (en) * | 1981-08-10 | 1983-02-17 | Toshiba Corp | Line searching system |
JPS5827275A (en) * | 1981-08-10 | 1983-02-17 | Toshiba Corp | Address controlling system for pattern memory |
JPS5999584A (en) * | 1982-11-30 | 1984-06-08 | Toshiba Corp | Determining device of optimum binary reference voltage |
JPH05101732A (en) * | 1991-10-04 | 1993-04-23 | Nitto Denko Corp | Method for forming conductive layer on epoxy resin insulating mold |
Also Published As
Publication number | Publication date |
---|---|
JPS5646188B2 (en) | 1981-10-31 |
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