JP2676513B2 - Method and apparatus for measuring magnification of layout image - Google Patents

Description

The present invention relates to a method and apparatus for measuring magnification of an image for layout. [Prior Art] Conventionally, in the field of printing plate making, a layout scanner having an editing function of performing color separation of an original and performing layout at the time of final finishing has been used. Before using this layout scanner, it is necessary to measure the magnification of the layout image roughly sketched on the layout designated paper with respect to the original document in the previous stage. In the above-mentioned magnification measuring method, a projection device is conventionally used if the original is a transparent original. If the original is a reflection original, the distance between two points on the layout image and the distance between two points on the original corresponding to the two points on the layout image are compared to determine the magnification. [Problems to be Solved by the Invention] However, the method using the projection device described above is very difficult to apply to a reflective original, and also difficult to apply to a transparent original having a low transmittance. Further, in the method based on the comparison of the distance between the two points described above, since the layout image is based on the rough sketch, and the selected two points do not necessarily correspond exactly between the original and the layout image, the projection device The measurement accuracy is lower than that of the whole comparison. It is an object of the present invention to easily and highly accurately measure the magnification of an image for layout with respect to an original regardless of whether the original is a reflective original or a transparent original. [Means for Solving Problems] The present invention provides a method for measuring a magnification of an image for layout, which measures a magnification of an image for layout on a designated sheet of layout with respect to a document,
While detecting a plurality of arbitrary position information constituting the contour of the document, at the same time detecting a plurality of position information constituting the contour of the layout image, the detection information is used to detect the contour of the document. In addition to obtaining the enclosed area, the area enclosed by the outline of the layout image is obtained, and the magnification is obtained based on the ratio of the area of the layout image to the area of the original. Is. Further, according to the present invention, in a layout image magnification measuring device for measuring a magnification of a layout image on a layout designated sheet with respect to a document, while detecting a plurality of arbitrary position information constituting the contour of the document, the layout A digitizer that detects a plurality of position information items that form the contour of the working image, and the detection information of this digitizer to obtain the area surrounded by the contour of the document, and the contour of the layout image. An arithmetic unit for obtaining the enclosed area and for obtaining the magnification based on the ratio of the area of the layout image to the area of the original. [Operation] According to the method for measuring the magnification of the layout image according to the present invention, the magnification can be measured by obtaining the area surrounded by the contours of the original and the layout image. It can be easily applied to the case of using the original document. Further, since the areas are compared, the entire shapes of the original and the layout image are compared, and the accuracy of magnification measurement is improved. Since the position information on the contours of the document and the layout image is given to obtain the area, the position information on the contour of the document and the position information on the contour of the layout image do not necessarily correspond to each other. It does not have to be a point, yet the magnification can be measured with high accuracy. According to the magnification measuring device for the layout image according to the present invention, the contour information of the document and the contour information of the layout image are detected by the digitizer, and the arithmetic unit obtains the detection information of the digitizer to obtain the magnification, The magnification can be easily measured with high accuracy under the condition that the magnification measurement work is simple and efficient. [Embodiment] FIG. 1 is a schematic diagram showing a magnification measuring device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the magnification measuring device, and FIG.
FIG. 4 is a schematic diagram showing an algorithm for measuring magnification, and FIG. 4 is a schematic diagram showing a document, an image for layout, and a disassembly drum of a layout scanner. In FIG. 4, 1 is a document, 2 is a layout image, 3 is a layout designation paper, and 4 is a disassembly drum of a layout scanner. The layout scanner is used for color separation of originals at the same time.
Equipped with an editing function that even performs the layout of the final finish. The magnification measuring device 10 measures the magnification of the layout image 2 roughly sketched on the layout designation paper 3 with respect to the original 1 before the layout scanner is applied. The magnification measuring device 10 includes a digitizer 20, a display device 30, a calculation device 40, and an operation unit 50. The digitizer 20 has a table 21 and a stylus pen (or cursor) 22 and stores position information (X / Y coordinates) of several points on the contour of each of the document 1 and the layout image 2 placed on the table 21. To detect. As the detection method of the digitizer 20, a known magnetic induction method, electromagnetic induction method, electrostatic induction method, optical method, ultrasonic method, or the like can be widely applied. The display device 30 displays the contour of the document 1 and the contour of the layout image 2 based on the detection information of the digitizer 20. The arithmetic unit 40 includes an input unit 41, a CPU (central processing unit) 42,
It has a memory unit 43. The input unit 41 is a digitizer 20.
And the operation information of the operation unit 50 are transferred to the CPU 42.
The memory unit 43 is the operation program of the CPU 42, the digitizer 2
The detection information of 0 and the calculation result of the CPU 42 are stored. CPU42
According to a predetermined algorithm written in the memory unit 43, the area A1 surrounded by the outline of the original 1 and the area A2 surrounded by the outline of the layout image 2 are obtained from the detection information of the digitizer 20, and the area is calculated. The square root of the ratio of the area A2 to A1 is obtained as the magnification n of the layout image 2 with respect to the original 1. The area calculation algorithm by the CPU 42 is as follows, for example. First, the contour of the manuscript 1 (or the layout image 2) is regarded as a polygon as shown in FIG. 3, and the position information of the points P0, P1, P2, ...
Ask at. The CPU 42 treats the above polygon as a set of triangles having the reference point P0 as its apex, and the area of △ P0 P1 P2 is S012, the area of △ P0 P2 P3 is S023, the area of △ P0 P3 P4 is S034 ... Ask for ... At this time, each triangle △ P0 Pi Pj
At (j = i + 1), if the straight line PO Pj is located counterclockwise around the point P0 with respect to the straight line P0 Pi, the area S0ij
Is positive, and the area S0ij is negative if the straight line P0 Pj is located clockwise from the straight line P0 Pi around the point P0, the areas of all triangles are integrated, and the absolute value of the area is added to the manuscript 1 (or the layout image 2). Area A1 (or A2) surrounded by the outline of). A = | S012 + S023 + S034 + ... | The operation unit 50 is composed of a car board or the like, and the arithmetic unit 40 is
The setting is switched to the detection information reading mode, the areas A1, A2, the calculation mode of the magnification n, and the like. Further, the operation unit 50 causes the display device 30 to display the contours of the document 1 and the layout image 2, or causes the display device 30 to display the magnification n or the like which is the calculation result of the calculation device 40. Switch the mode and set. In addition, the above-mentioned operation part is located at a specific position of the digitizer 20.
It may be provided as shown by A and may transfer a specific operation command to the display device 30 and the arithmetic device 40 in response to the stylus pen 22 instructing a specific position. The operation procedure for measuring the magnification of the layout image 2 with respect to the original 1 using the magnification measuring device 10 will be described below. The document 1 is placed on the digitizer 20, position information of several points on the contour of the document 1 is detected, and this detection information is calculated by the arithmetic unit 40.
And the outline of the document 1 based on the detected information is displayed on the display device 30. The layout image 2 of the layout designation paper 3 is placed on the digitizer 20, the position information of some points on the contour of the layout image 2 is detected, and this detection information is transferred to the arithmetic unit 40, and this detection information is also transmitted. The contour of the allocation image 2 based on is displayed on the display device 30. In the arithmetic unit 40, the area A1 surrounded by the contour of the original 1 is obtained from the contour information of the original 1 obtained above by the above-mentioned algorithm, and the above-mentioned algorithm is obtained from the contour information of the layout image 2 obtained above. Then, the area A2 surrounded by the contour of the layout image 2 is obtained. Further, the square root of the ratio of the area A2 to the area A1 is obtained as the magnification n of the layout image 2 with respect to the original 1. The magnification n obtained above is displayed on the display device 30. According to the above embodiment, the area A1 of the original 1 and the layout image 2
The magnification can be measured by finding the area A2 of
It can be easily applied to any one of the reflective original and the transparent original 1. Further, the rough sketch is drawn roughly by the operator on the designated layout paper 3, and since the shape does not necessarily match the original, the distance between the two points on the rough sketch as in the prior art, When the magnification is obtained by comparing the distance between two points on the document 1 corresponding to these two points, the measurement accuracy is low. On the other hand, in the above embodiment, the magnification of the layout image is obtained by comparing the area surrounded by the contour of the document with the area surrounded by the contour of the layout image. The overall shape (size) of the layout image 2 is compared, and the accuracy of magnification measurement is improved compared to the conventional case. Then, since position information on each contour of the document 1 and the layout image 2 is given to obtain the area, the position information on the contour of the document 1 and the position information on the contour of the layout image 2 are different from each other. The two do not necessarily have to be corresponding points, and yet the magnification can be measured with high accuracy. Further, according to the above-mentioned embodiment, the contour information of the document 1 and the contour information of the layout image 2 are detected by the digitizer 20, and the arithmetic unit 40 obtains the detection information of the digitizer 20 to obtain the magnification. The magnification can be easily and highly accurately measured under the condition that the measurement work is simple and efficient. In the practice of the present invention, the areas of the original document and the layout image may be obtained by any method. EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to easily and highly accurately measure the magnification of the layout image with respect to the original regardless of whether the original is a reflective original or a transparent original. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a magnification measuring device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the magnification measuring device, and FIG. 3 is a schematic showing an algorithm for magnification measurement. FIG. 4 and FIG. 4 are schematic diagrams showing a document, an image for layout, and a disassembly drum of a layout scanner. 1 ... manuscript, 2 ... layout image, 3 ... layout specified paper, 10 ... magnification measuring device, 20 ... digitizer, 40 ... computing device.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Junichi Tamura               Tokorozawa 5-21 Yamaguchi 5216-1-105-2-203                (56) Reference JP-A-61-269565 (JP, A)                 Actual Development Sho 61-179558 (JP, U)

Claims (1)

(57) [Claims] A method for measuring the magnification of a layout image on a layout-specified sheet with respect to an original, in a method for measuring the magnification of a layout image, detecting a plurality of arbitrary position information constituting the outline of the original, and forming the outline of the layout image. Detect any arbitrary position information, and use the above detection information to determine the area enclosed by the outline of the original document and the area enclosed by the outline of the layout image. A method for measuring a magnification of an image for layout, wherein the magnification is obtained based on a ratio of the area of the layout image to the area. 2. In a layout image magnification measuring device for measuring a magnification of a layout image on a layout designated sheet with respect to a document, a plurality of arbitrary position information constituting a contour of the document is detected and a contour of the layout image is constructed. A digitizer that detects arbitrary plural pieces of position information and the detection information of this digitizer are obtained, and the area surrounded by the contour of the original is obtained, and the area surrounded by the contour of the layout image is obtained. And an arithmetic unit for calculating the magnification based on a ratio of the area of the layout image to the area of the original document.