JPH11250268A - Graphic processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a graphic processor added with a function for tracing a reference picture from an area in the vicinity of an input point, and extracting and inputting a featured point as a control point to be inputted for a graphic operation. SOLUTION: This processor is provided with a picture data storing means for storing picture data 26, a graphic data storing means for storing graphic data 25, a coordinate point inputting means 15 for inputting the coordinate of an input point, a display means 16 for displaying picture data and graphic data, a graphic operation processing means 21 for operating the picture data and the graphic data, a control point inputting means 23 for inputting a control pint for executing the operation of the graphic data 25 by referring the picture data, and a picture featured point recognizing means 24. Thus, a prescribed area is set in the neighborhood of the input point inputted by the coordinate point inputting means 15 so that the input point can be obtained as a control point for a graphic operation, and the prescribed area is scanned. When the picture of the picture data 26 is present in the prescribed area, a picture point is detected, the pictures is traced to the extended direction of the picture from the detected picture point, and the traced point is applied to the control point inputting means 23 as the control point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic processing apparatus, and more particularly, to a graphic processing apparatus such as a CAD (design support computer) apparatus for performing a graphic operation by tracking an image referred to for a graphic to be operated. The present invention relates to a graphic processing apparatus in which a function of extracting a feature point and inputting it as a control point is added to a graphic operation processing function.

[0002]

2. Description of the Related Art Conventionally, as an input method for inputting a drawing drawn on a paper to a graphic processing system, first, the drawing is converted into an image.
After inputting as image data by a scanner or the like and displaying the image data on the screen by the graphic processing system, the operator traces by hand input using a pointing device or the like while viewing the image data on the screen. The input method is generally performed.

For example, in the interactive graphic input method described in Japanese Patent Application Laid-Open No. 62-269276, a drawing is once input as image data to a computer using a scanner, and the image data and the center line image data are input. Are superimposed on the display screen, and the necessary position for forming a graphic on the display is indicated by a coordinate indicator, thereby inputting the graphic as vector data.

Thus, for example, when converting image data (image data) into graphic data such as vector data, the center data of the center (center line) of a line image is obtained.
Endpoints, which are the required image feature points from the central data,
Data such as branch points and corner points are selected and input.
In this case, in order to input a feature point, the center data and the image data are superimposed and displayed on the display screen, and the input of the feature point is performed. For this reason, the display screen becomes complicated, and the operator cannot efficiently select necessary data.

For example, when a point 52 which is a characteristic point (corner point) indicating a characteristic of a "┓" type graphic as shown in FIG. The center point data 51 is obtained from the center point data 50, both the image data 50 and the center point data 51 are displayed, a selection is made from the center point data 51, the point 52 of the characteristic point is designated, and the graphic data is input. Had to do.

[0006]

However, the above-described graphic operation method for inputting graphic data (vector data) requires a procedure of first inputting a drawing as image data and obtaining center point data. is there. Furthermore, in order to specify a feature point thereafter, two operations are required, such as selecting the point 52 by manual input on the display screen. As described above, the operation for obtaining the graphic data by the operator becomes complicated, and in addition, it may not be possible to accurately specify a feature point because input is performed manually.
There is a problem that an error occurs in the input graphic data.

[0007] The present invention has been made to solve such problems, and the object of the present invention is to provide:
In the graphic processing device, as a control point to be input for a graphic operation, a function in which a reference image is tracked from an area near the input point to extract a proper feature point and input is added to the graphic operation processing function. An object of the present invention is to provide a processing device.

[0008]

To achieve the above object, a graphic processing apparatus according to the present invention comprises: an image data storing means for storing image data; a graphic data storing means for storing graphic data; Coordinate point input means for inputting coordinates of image data, display means for displaying image data and graphic data, graphic operation processing means for operating image data and graphic data, and operation of graphic data with reference to the image data Control point input means for inputting the control points of the above, and a predetermined area is set near the input point so that the input point input by the coordinate point input means is used as a control point for graphic operation. When an image exists in the predetermined area by scanning the inside, the image point is detected, the image is tracked from the detected image point in a continuous direction of the image, and the tracked point is controlled as a control point. Score Characterized in that an image feature point input means for providing the means.

In the graphic processing apparatus, the image feature point input means tracks the image in a continuous direction of the image, and the points given to the control point input means as control points are extracted from the line image. It is one of a point that is discontinuous with respect to the tracking direction to be performed, a point where the image tracking direction branches, and a point where the image tracking direction changes.

In the graphic processing apparatus, the image feature point input means sets a predetermined area near the input point in order to use the input point input by the coordinate point input means as a control point for graphic operation. When a predetermined area is scanned and no image exists in the predetermined area, the input point input by the coordinate point input means is given to the control point input means as a control point.

In the graphic processing apparatus having such features, the image data storage means stores the image data, and the graphic data storage means stores the operated or operated graphic data. The coordinate point input means inputs coordinates of the input point, and the display means displays image data and graphic data. The graphic operation processing means operates the displayed image data and graphic data. In this case, the control points for inputting the control points for operating the graphic data with reference to the image data are input by the control point input means. Here, the image feature point input means inputs the input points input by the coordinate point input means. To set control points for graphic operations, a predetermined area is set in the vicinity of the input point, and scanning is performed within the predetermined area. When an image of image data exists in the predetermined area, the image point is set. An image is detected, the image is tracked from the detected image point in a continuous direction of the image, and the tracked point is provided to the control point input means as a control point.

In this case, the image feature point input means tracks the image of the image data in a continuous direction of the image, and the points given to the control point input means as control points are extracted from the line image. The point is discontinuous with respect to the tracking direction to be detected, the point where the tracking direction of the image branches, the point where the tracking direction of the image changes, and
In the graphic processing device, the image feature point input means sets a predetermined area near the input point in order to use the input point input by the coordinate point input means as a control point for graphic operation. Is scanned and if no image exists in the predetermined area, the input point input by the coordinate point input means is given to the control point input means as a control point.

Thus, the image of the image data is tracked without enlarging and displaying the image data serving as reference information for performing the graphic operation, and a specific feature point of the image data is accurately designated and controlled. Can be used as a point.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as an embodiment. FIG. 1 is a block diagram showing a configuration of a graphic processing apparatus according to one embodiment of the present invention. The graphic processing apparatus includes a central processing unit 11 for performing various processes, a program memory 12 for storing a program necessary for processing in the central processing unit 11, and an image memory for storing image data 26 to be referenced for graphic processing. 13, a data memory 14 for storing graphic data 25 to be subjected to graphic processing, a coordinate input device 15 for inputting a coordinate position required for graphic operation, a display device 16 for displaying image data 26 and graphic data 25 It is composed of

The program memory 12 stores a program constituting a graphic operation processing unit 21 for performing various graphic operations. The graphic operation processing unit 21
2. In addition to the control point input unit 23, an image feature point recognition unit 24 is provided. The central processing unit 11 stores the program memory 1
The figure is operated based on the program of the figure operation processing section 21 of FIG. The graphic operation unit 22 is a part that provides basic processing functions for performing graphic operations such as graphic generation, deletion, movement, copying, and the like. The control point input unit 23 includes, for example,
This portion provides a processing function for inputting a point (control point) for designating a figure when performing a figure operation for figure editing. The image feature point recognizing unit 24, as an image feature point input unit, analyzes the type of the input point input by the processing of the control point input unit 23, and then replaces the input point with a feature point of an image nearby. If you decide you need it,
For example, when the image data exists in a certain predetermined range centered on the input point, the processing is started, the image of the predetermined area of the image data 26 is tracked, and the processing of extracting the feature points of the image is performed.

FIGS. 2A and 2B are explanatory diagrams for explaining the processing operation of the image feature point recognition unit. FIG.
(2a) and (2b). When performing a graphic operation, when a point required for a graphic operation is input from the coordinate input device 15 to the central processing unit 11, the central processing unit 11 performs a graphic operation process according to the graphic operation processing unit 21. Do. First, the control point input unit 23
After the type of input point is analyzed by the processing of (1), when it is determined that the input point needs to be replaced with a feature point of an image in the vicinity thereof, for example, as shown in (2a), When the image data 30 exists in the rectangular area 31 within a certain range around the input point S with respect to the input point S, the process by the image feature point recognition unit 24 is started.

In the process of the image feature point recognition unit 24, first,
When the input point S is input, as shown in (2a), the presence of the image data 30 within a certain range of the rectangular area 31 around the input point S is determined. The image data P is detected by scanning the image data spirally from the input point S (scanning in the direction of the dashed arrow). When the image point P is detected, as shown in (2b), a determination area range 32 of a fixed rectangular area around the detected image point P is set. The determination region range 32 is a range of a region for determining a feature point of an image near the input point S. Then, the shape of the image within the determination area range 32 is determined, and the feature points are extracted. Such data processing,
Physically, processing is performed sequentially from the input point coordinate data,
This is a process of setting a predetermined area on the image data 26 stored in the image memory 13, detecting the determination of the shape of the image within that range, and recognizing and extracting feature points of the image.
After the extraction of the feature points, the central processing unit 11 returns the processing to the control point input unit 23 again, inputs the extracted feature points as control points, and performs the graphic operation by the control points in the processing of the graphic operation unit 22. Do. The result of such a series of processing is displayed on the display device 16 or reflected on the graphic data 25 stored in the data memory 14.

FIG. 3 is a flowchart showing a processing flow of processing in the image feature point recognition unit. Further, (4a), (4b), (4c), and (4d) of FIG. 4 are explanatory diagrams illustrating an example of a detection process of various feature points of an image to be extracted.

First, an image feature point recognition process for inputting feature points of an image will be described with reference to the process flow of FIG. Now, an input point S required for graphic operation is input from the coordinate input device 15 to the control point input unit 23 of the graphic operation processing unit 21.
It is assumed that the information has been input through In the central processing unit 11, the image feature point recognition unit 24 performs an image feature point recognition process based on the coordinate data of the input point S. In the image feature point recognition process, first, in step 101, an input point S is obtained from the control point input unit 23, and the next step 102
Then, a predetermined range centered on the coordinates of the input point S from the image data 26 stored in the image memory 13 is set as the vicinity of the input point S in correspondence with the input point S. Next, in step 103, this neighborhood range is scanned to determine an image point. Then, in the next step 104, it is determined whether or not the image point has been detected. If no image point has been detected, the process proceeds to step 105, where the input point S input is passed to the control point input unit 23 to be regarded as a control point, and the image feature point recognition processing ends.

On the other hand, if an image point is detected in step 104, the process proceeds to step 106, where a tracking determination range is set from the detected image point. This tracking determination range is a range of a fixed rectangular area centered on the detected image point P (2
b). Next, within the tracking determination range set in step 107, the image is tracked in a direction that is linearly continuous. In this tracking, the image is tracked in a direction where the image is linearly continuous in both the right and left directions with respect to the image point. Next, the result of the tracking is determined to be a feature point.

First, in step 108, as shown in (4c), it is determined whether or not a point Me (end point) where the image is discontinuous in the tracking direction has been detected. Point Me
If is not detected, the process proceeds to step 109, and as shown in (4a), it is determined whether or not the point Mb (branch point) at which the image tracking direction branches is detected. If the point Mb cannot be detected, the process proceeds to step 110, and as shown in (4b), it is determined whether or not a point Mc (corner point) where the tracking direction of the image has changed has been detected. If the point Mc cannot be detected, the process proceeds to step 112. As described above, when none of the feature points Me, Mb, and Mc can be detected, the point Mm (4d) which is the center of the line width of the image and is closest to the input point S is determined in step 112. Then, the process proceeds to step 113.

On the other hand, if the point Me can be detected in step 108, the point Mb can be detected in step 109, or if the point Mc can be detected in step 110, the process proceeds to step 111 in any case. The detected point is set as a feature point, and the process proceeds to step 113. In step 113,
In order to use the extracted feature points as control points instead of the input points S,
This is passed to the control point input unit 23, and the image feature point recognition processing ends.

As described above, according to the present embodiment, when the input point S is input from the coordinate input device 15, an image area range near the input point S is automatically set from the image data 26, Recognize feature points from images in the image area range,
A control point is used instead of the input point S. Therefore, the display screen of the display device 16 without enlarging the reference image for the graphic operation and having a limited display area for this purpose is
Without switching every control point input, it is possible to obtain an accurate control point and operate a figure even if an incorrect point input is made.

The essential points of the present embodiment described above are summarized as follows. That is, (1) When performing a graphic operation, the coordinates of a point input by a coordinate input device or the like are defined as input points, and a predetermined area within a certain range centered on the input point is defined as an area near the input point. (2) Next, in the defined neighboring area, the image data is scanned from the input point to detect the image point. (3) By detecting image points, a certain range around the detected image points is limited as a determination range for recognizing feature points of the image. As a result, the image data area of the target image whose feature point is to be recognized is determined. (4) In the limited determination range, tracking of the image point is started from the detected image point, and the image point is tracked in a direction that is linearly continuous. Then, the shape of the image is determined based on the tracking result, that is, the feature of the image as a linear image is evaluated, and the feature points are extracted. (5) In the case where the image point is tracked in a continuous direction, when a discontinuous point of the image point is detected, this is determined as an end point and is set as a feature point of the image. (6) If a point where the continuous direction of the image is branched into a plurality of parts is detected, this is determined as a branch point and is set as a feature point of the image. (7) When a point in which the continuous direction of the image changes is detected, this is determined as a corner point and is set as a feature point of the image. (8) Also, in the process of extracting such a feature point, if no end point, branch point, or corner point is detected, it is the center of the line width of the image and most likely to be the input point. A near point is obtained, and the center point of the image line width is set as a feature point of the image. (9) The obtained feature points are replaced with the input points,
It is passed to a control point input unit as a control point for performing a graphic operation. As a result, a specific feature point of the image data can be accurately specified and used as a control point without enlarging and displaying image data serving as reference information for performing a graphic operation.

Although the present invention has been described in detail with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the scope of the invention. .

[0026]

As described above, according to the present invention, when performing a graphic operation with reference to an image in a graphic processing apparatus, a part of the reference image is not enlarged for each control point input. Therefore, there is an effect that a feature point on a reference image can be accurately detected by an inaccurate control point designation without switching the display screen each time, and the detected feature point can be used as a control point. This also has the effect that the operator can reduce the figure operation time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a graphic processing apparatus according to an embodiment of the present invention;

FIGS. 2A and 2B are explanatory diagrams illustrating an operation of a process performed by an image feature point recognition unit; FIGS.

FIG. 3 is a flowchart showing a processing flow of processing in an image feature point recognition unit;

FIG. 4 (4a), (4b), (4c) and (4d)
Is an explanatory diagram illustrating an example of a detection process of various feature points of an image to be extracted,

FIG. 5 is an explanatory diagram illustrating an example of a conventional method of inputting feature points of an image.

[Explanation of symbols]

 11: central processing unit, 12: program memory, 13: image memory, 14: data memory, 15: coordinate input device, 16: display device, 21: graphic operation processing unit, 22: graphic operation unit, 23: control point input Unit 24 image feature point recognition unit 25 graphic data 26 image data

Claims (3)

[Claims] 1. An image data storage means for storing image data, a graphic data storage means for storing graphic data, a coordinate point input means for inputting coordinates of an input point, and a display means for displaying image data and graphic data. Graphic operation processing means for operating image data and graphic data; control point input means for inputting control points for operating graphic data with reference to the image data; and input by the coordinate point input means. In order to set the input point as a control point for graphic operation, a predetermined area is set in the vicinity of the input point, and when the image of the image data exists in the predetermined area by scanning the predetermined area, Image feature point input means for detecting an image point, tracking an image from the detected image point in a continuous direction of the image, and providing the tracked point as a control point to a control point input means. That graphics processing apparatus. 2. The graphic processing apparatus according to claim 1, wherein said image feature point input means tracks an image of the image data in a continuous direction of the image, and uses the tracked point as a control point. Is a point that is discontinuous with respect to the tracking direction extracted from the line image, a point where the image tracking direction branches, or a point where the image tracking direction changes. A graphic processing device characterized by the above-mentioned. 3. The graphic processing apparatus according to claim 1, wherein said image feature point input means sets the input point input by said coordinate point input means as a control point for graphic operation. A predetermined area is set in the vicinity of and the predetermined area is scanned. If no image exists in the predetermined area,
A graphic processing apparatus characterized in that an input point input by the coordinate point input means is given to a control point input means as a control point.