Image analysis – Histogram processing – For setting a threshold
Patent
1993-09-09
1995-05-16
Herndon, Heather R.
Image analysis
Histogram processing
For setting a threshold
395143, 395155, 382276, G06T 1120, G09G 106
Patent
active
054169020
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a graphic editing method and system for editing line figures of a predetermined format, which undergo central management by a host computer (hereinafter referred to as "host").
BACKGROUND ART
Heretofore, it has been performed to display drawings on a monitor display on the basis of graphic data prepared in advance by a computer and stored in a storage unit, and to correct (delete, add, and the like) the displayed graphics. (This is referred to as computer mapping hereinafter). Such drawings include ones showing the condition of underground facilities such as gas pipes, water pipes, and the like, and ones showing configurations of roads and conditions of road facilities.
FIG. 18 shows an arrangement of a conventional computer mapping system.
This system comprises a host 21 and a terminal 29, which are interconnected by a communication line 37.
The terminal 29 comprises a communication interface 30, a control processor 31, a picture memory 32, a frame buffer 33, a CRT ( display portion) 34, a digitizer (input portion) 35, and an image bus 36.
The host 21 comprises a memory 22, a communication interface 25, a host processor 26, a common file storage unit 27, and a host bus 28.
The memory 22 has an application program storing area 24 for storing application programs, and a work area 23.
Graphic data stored in the common file storage unit 27 has a format, for example, as shown in FIG. 19. It comprises a header 51, and graphic data 52 following the header 51. The graphic data 52 comprises coordinate data 53 indicating positions of characteristic points (or inflection points) of lines, and attribute data 54 indicating line types, colors, and the like between a characteristic point and the next characteristic point. Hereinafter, a set of the coordinate data and the attribute data is referred to as characteristic point data (or inflection point data).
FIG. 20 is a flowchart showing an application program stored in the application program storing area 24.
Suppose that a drawing (paper) to be edited is set on the digitizer 35. In this condition, when a display request command is issued in step S201 by operator's handling of the digitizer 35, and a drawing number specifying the drawing to be edited is entered, the display request command and the drawing number are transferred to the communication interface 30 through the image bus 36 by the control processor 31, and then transmitted to the host 21 through the communication line 37 by the communication interface 30 in step S202.
When the display request command and the drawing number are received by the communication interface 25 of the host 21 in step S203, the graphic data set of the drawing to be edited associated with the drawing number is retrieved from the common file storage unit 27 by the host processor 26. The retrieved graphic data set is stored in the work area 23 of the memory 22. Then, the graphic data set in the work area 23 is transferred to the communication interface 25 through the host bus 28, and transmitted to the terminal 29 through the communication line 37 by the communication interface 25.
When the graphic data is received by the communication interface 30 of the terminal 29 in step S204, the received graphic data is stored in the picture memory 32 by the control processor 31. Then, the graphic data in the picture memory 32 is stored in the frame buffer 33 by the control processor 31, and the figure is raster displayed on the CRT 34 on the basis of the graphic data stored in the frame buffer 33.
When edit data indicating correction types such as deletion and addition, and correction starting points are entered by the operator's handling of the digitizer 35 in step S205, the edit data is transferred to the communication interface 30 by the control processor 31, and transmitted to the host 21 through the communication line 37 by the communication interface 30.
When the edit data is received by the communication interface 25 of the host 21 in step S206, the host processor 26 corrects the graphic
REFERENCES:
patent: 4665555 (1987-05-01), Alker et al.
patent: 5179651 (1993-01-01), Taaffe et al.
Sato Hiroto
Shinoaki Sakura
Tanaka Kyozo
Herndon Heather R.
Nguyen Vo Cliff
Tokyo Gas Co. Ltd.
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