JP4263294B2 - Raster data editing method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a raster data editing method and apparatus for performing editing processing on image data such as drawing data read or recorded in the form of raster data.
[0002]
[Prior art]
When editing raster format drawing data read by a scanner, typically various dot editing operations such as erasing, adding, copying, moving, rotating, changing or inverting colors, enlarging / reducing, etc. are performed. Things have been done. The biggest drawback of editing operations in such raster units is that if you rewrite an arbitrary part, the unintended part will be erased, or if you enlarge it, the line thickness will become thick as it is, or the line type will change. However, it is difficult to perform a free editing operation in the state of raster data as it is a manual operation.
[0003]
Therefore, a method that extracts the connected components that make up each graphic element from the raster data, converts the raster data into vector data for each graphic element, and adds the necessary editing processing to the converted vector data. Has also been realized.
[0004]
[Problems to be solved by the invention]
However, when the raster data is converted into vector data, the original data disappears from the screen, so it cannot be confirmed whether the vector data is correctly converted from the original raster data. For this reason, there is a problem that the conversion error is not corrected and the data is output as it is. Further, when the vector data is repeatedly enlarged, reduced, moved, etc., there is a problem that the size and amount of movement with respect to the original data cannot be known, which also hinders the editing operation.
[0005]
The present invention has been made in view of such a problem. When editing data by converting raster data into vector data, it is possible to confirm whether the raster data has been correctly converted into vector data. It is an object of the present invention to provide a raster data editing method and apparatus capable of grasping at a glance the amount of change or movement of data, and thereby facilitating editing operations.
[0006]
[Means for Solving the Problems]
The raster data editing method according to the present application specifies at least a part of a connected element constituting a graphic element to be edited among raster data composed of a set of dot data, and connects the graphic elements to be edited. after issuing the elements extracted, converts the raster data of the extracted coupling elements to the vector data maintaining the characteristics of the figure elements, when subjected to a predetermined editing processing on the converted vector data, output the extracted The raster data of the connected elements thus displayed is displayed in a form distinguishable from the original raster data excluding the extracted raster data and the converted vector data.
[0007]
The raster data editing apparatus according to the present application includes a memory for storing raster data including a set of dot data, a display unit for displaying raster data stored in the memory, and a raster data displayed on the display unit. A graphic element designating means for designating a graphic element to be edited, a connected area extracting means for extracting a connected element constituting the graphic element designated by the graphic element designating means, and an extracted connected element Raster / vector conversion means for converting raster data into vector data, vector data editing means for performing edit processing on graphic elements converted into vector data by this means based on external instructions, and vector data editing when editing the vector data means, raster data of the extracted coupling elements, except for the extracted raster data Characterized in that a raster data and extracting area display processing means for displaying on said display means in the converted vector data and identifiable form with.
[0008]
According to the present invention, when raster data is converted into vector data and subjected to predetermined editing processing, the raster data extracted to be converted into vector data is converted into the original raster data and the converted vector data. The information is displayed in an identifiable form (for example, different colors, halftones, etc.). For this reason, it is possible to easily grasp the correspondence relationship between the original raster data and the converted vector data, and it is also easy to grasp the positional relationship and magnitude relationship with the original raster data when operating the vector data. The editing operation is extremely easy.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram for explaining a raster data editing apparatus according to an embodiment of the present invention.
The image shown in FIG. 1 before correction is read by the scanner 2, converted into raster data such as bitmap data, and stored in the memory 3. The format of the raster data to be stored may be one that has been subjected to appropriate compression processing, such as run length data, MR, MMR, TIFF, CALS, etc., taking into account the storage capacity. The image data of the drawing stored in the memory 3 in the form of raster data is displayed on the display unit 4 together with an icon for command input necessary for the editing process and is appropriately edited by the editing processing unit 6 according to the operation of the input unit 5. The The edited image data is stored in the memory 3 in the form of original raster data, and is output as a corrected drawing 8 via a print output unit 7 such as a printer or plotter based on the operation of the input unit 5.
[0010]
The edit processing unit 6 is specifically configured as shown in FIG. That is, the graphic element specifying unit 11 is used by an operator to specify a graphic element to be edited. The connected area extracting unit 12 extracts connected elements that constitute the designated graphic element. The raster / vector conversion unit 13 converts the extracted raster data of the connected elements into vector data. The vector data editing unit 14 is used by the operator to appropriately edit the converted vector data. The vector / raster converter 15 converts vector data edited using the vector data editor 14 into raster data. The intersection area processing unit 16 performs processing so as not to delete the intersection when the connected area extracted by the connected area extraction unit 12 is deleted from the original raster data. The extraction area display processing unit 17 is used to display the area in, for example, halftone so that the area where the connected area extracted from the original raster data exists can be identified during editing. The image composition processing unit 18 synthesizes the raster data from which the connected area excluding the intersection is deleted from the original raster data and the data converted into the raster data by the graphic element after the editing process.
[0011]
Next, the operation of the apparatus of the present embodiment configured as described above will be described.
In editing a drawing, first, the operator uses the graphic element specifying unit 11 to specify a graphic element to be edited. The graphic element to be edited is instructed by, for example, a straight line, rectangle, circle, arc, free curve, or character string, using a mouse or keyboard, and next to the graphic element to be edited A point can be specified by instructing about 1 to 3 points by operating the mouse.
[0012]
Next, the connected region extracting unit 12 extracts a connected component of the designated graphic element. Now, assuming that the designated graphic element is a straight line 21 as shown in FIG. 3, for example, the raster data of the predetermined area A including the point designated by the mouse pointer 22 or the like is clipped from the memory 3 first. Reduce the number of data to be processed. Next, a contour line in the area A of the connected elements constituting the straight line 21 is extracted, and a region surrounded by the contour line is extracted as a connected region. The raster / vector conversion unit 13 extracts the short vector v of the center line based on the contour line obtained by the connected region extraction unit 12. The short vector v can be easily obtained by sequentially obtaining an intermediate point between intersections of a line orthogonal to the contour line and each contour line at predetermined intervals along the contour line. For example, the area A is sequentially moved in the direction specified by the short vector v. Thus, a set of short vectors v over a predetermined range is obtained.
[0013]
Subsequently, one long vector V is generated by lengthening the obtained short vector v. The long vector V can be easily obtained by a method such as a least square method. Here, it may be determined whether or not the designation of the graphic element is inappropriate by determining whether or not the contour line and the long vector intersect. When the long vector is extracted, the width W of the straight line, the inclination θ of the straight line, the position of the point where the perpendicular line extending from the designated coordinate point P to the center line intersects, etc. are extracted as graphic element parameters, and these are extracted as straight line vector data Composed. The raster / vector conversion unit 13 deletes the original raster data of the extracted graphic element and replaces it with the obtained vector data.
[0014]
Next, vector data editing processing is executed on the graphic element replaced with vector data by using the vector data editing unit 14. Examples of vector data editing processing include enlargement, reduction, movement, copying, line type change, line width change, and the like. Unlike raster data, these are only changes in coordinate values and other parameters. The editing operation is extremely easy. The vector data edited in this way is converted into raster data by the vector / raster conversion unit 15, and finally the raster data obtained by removing the graphic element to be edited from the original raster data by the image composition processing unit 18. And the corrected drawing data is obtained.
[0015]
Next, the process of an intersection area | region is demonstrated. For example, when correcting the arc 31 among the raster data including the arc 31 and the straight lines 32 and 33 as shown in FIG. 4, the operator instructs editing of the arc by an icon or the like on a display screen (not shown). Click near the arc 31 with the pointer 22. Thereby, in the portion sandwiched between the straight lines 32 and 33, short vectors are sequentially obtained in the same manner as described above, and an arc is obtained by a set of these short vectors. The arc 31 intersects with the straight lines 32 and 33, respectively. Since the portions 34 and 35 are provided, the contour line greatly changes in the direction of the short vector at the intersecting portions 34 and 35. For this reason, the intersection area | region process part 16 detects the big change of the angle of a short vector and an outline. Further, two points of closest intersection between the line perpendicular to the short vector and the contour line are detected by sequentially proceeding in the short vector direction. The intersections 34 and 35 are specified from these detection points and stored in the memory 3 as intersection data.
[0016]
FIG. 5 shows a state in which the extracted arc 31 of raster data is converted into an arc 36 of vector data. If the arc 31 'of the original raster data superimposed on the vector data is displayed in a form distinguishable from both the original raster data and the converted raster data, for example, halftone and different colors, It can be easily determined whether or not the vector data has been correctly converted, and if it has not been correctly converted at the same time, the necessary correction can be made. When the radius and line type of the arc 36 of the vector data are changed, the result is as shown in FIG. When the arc 31 of the original raster data is displayed as an arc 31 'with halftone or different colors, it is possible to identify how much the original raster data has been corrected, and the editing operation becomes easy. . At this time, the raster data of the intersecting portions 34 and 35 remains as a part of the straight lines 32 and 33. This process is executed by the extraction area display processing unit 17. This prevents the intersections 34 and 35 from being erased by the extraction of the arc 31. Edited drawing data in a raster data format including a modified arc 37 as shown in FIG. 7 by converting the edited vector data into raster data and synthesizing it with the original raster data by the image composition processing unit 18. Is required.
[0017]
As described above, according to this embodiment, since the portion to be edited is converted from raster data to vector data and editing processing is performed, editing operations such as line type change, line width change, radius change and the like can be performed. It is easy, and processing such as keeping the line width constant by enlargement / reduction processing is possible. Further, during the editing operation, the raster data to be edited is displayed in a different form from the others, so that the editing operation can be easily performed.
[0018]
【The invention's effect】
As described above, according to the present invention, when raster data is converted into vector data and subjected to predetermined editing processing, the raster data extracted to be converted into vector data is converted into original raster data and converted data. Since the displayed vector data is displayed in an identifiable form, the correspondence between the original raster data and the converted vector data can be easily grasped. Since it is easy to grasp the positional relationship and size relationship with the raster data, the editing operation becomes extremely easy.
[Brief description of the drawings]
FIG. 1 is a block diagram of a raster data editing apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram of an editing processing unit in the apparatus.
FIG. 3 is a diagram for explaining raster data editing processing in the apparatus;
FIG. 4 is a diagram for explaining raster data editing processing in the apparatus;
FIG. 5 is a diagram for explaining the editing process;
FIG. 6 is a diagram for explaining the editing process.
FIG. 7 is a diagram for explaining the editing process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Drawing before correction, 2 ... Scanner, 3 ... Memory, 4 ... Display part, 5 ... Input part, 6 ... Editing process part, 7 ... Print output part, 8 ... Drawing after correction.

Claims (2)

Specifying at least a part of the connecting elements constituting the edited graphic element to be out of the raster data consisting of a set of dot data, after issuing extract the coupling elements of the graphic element to be the editing was extracted When converting raster data of connected elements into vector data that maintains the characteristics of the graphic elements, and performing a predetermined editing process on the converted vector data,
Raster data, characterized in that the raster data of the extracted issued the connecting element, formed by the display under the raster data and the converted vector data and identifiable form except the extracted raster data How to edit A memory for storing raster data consisting of a set of dot data;
Display means for displaying raster data stored in the memory;
Graphic element designating means for designating graphic elements to be edited with respect to the raster data displayed on the display means;
Connected region extracting means for extracting connected elements constituting the graphic element specified by the graphic element specifying means;
Raster / vector conversion means for converting the extracted connected elements from raster data to vector data;
Vector data editing means for performing an editing process based on an instruction from the outside for the graphic element converted into vector data by this means,
When vector data is edited by the vector data editing means, the extracted raster data of the connected elements can be distinguished from the original raster data excluding the extracted raster data and the converted vector data. Raster data editing apparatus, comprising: extraction area display processing means for displaying on the display means in a form.

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