JPH05158206A - Magnification measuring device - Google Patents

Abstract

PURPOSE:To use displayed magnification as the magnification of a finished image against an original image, as it is, without separately preparing exclusively used equipment, and separately having a calculation, when projection is attained on an arrangement mount, as well. CONSTITUTION:A mode specifying means 20 specifying whether a charger to a charging stand 12 is an original 30 or an arrangement mount 33, as an original mode or an arrangement mount mode, by the operation of an operator is provided, a prescribed operation is executed based on a mode specified by the mode specifying means 20, by using a distance from a projecting plate surface 14 to the charging stand 12 or a projecting lens 13, in a stage where the projected image of the image of the original or the arrangement mount, is coincident with the image of the the arrangement mount or the original, and the magnification of the finished image against the original image is calculated, and displayed on a display means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manuscript by matching the projected image of the manuscript image or the image of the layout mount with the image of the layout mount or the image of the manuscript when performing plate making by, for example, a color scanner. The present invention relates to a magnification measuring device that obtains a magnification of a finished image with respect to an image. Especially when a document is projected, or when a layout mount is projected, the displayed magnification can be directly applied to a document image without separately calculating the magnification. The present invention relates to a magnification measuring device that can be used as a magnification of an image.

[0002]

2. Description of the Related Art Conventionally, a color scanner has been used for color plate making from an original such as a photographic negative. This color scanner puts a document on a drum, rotates this drum, and scans in the axial direction.
The image (pattern) of the original is photoelectrically scanned and read, and the image is separated into each color and necessary correction is performed to automatically produce a mesh positive or a half negative of each color for plate making. Then, this color scanner can arbitrarily make a halftone positive and a halftone negative of a size obtained by enlarging / reducing an original photograph to that size by setting an enlargement / reduction ratio.

However, on the other hand, for that purpose, it is necessary to measure how many times (or a fraction of) the finished image (picture) size is larger than the image (picture) size of the original. , It is necessary to proceed with the plate making work based on it.

Therefore, conventionally, for example, two points on the image of the original are selected, the distance between these two points is measured with a ruler, calipers, etc., and the numerical values obtained by these measurements are divided to calculate the magnification. The method has been adopted.

However, in such a method of calculating the magnification, since many parts rely on manual work, not only is it inefficient and the workability is poor, but there are many errors and reading errors associated with dimension measurement. Therefore, there is a problem that it is difficult to accurately calculate the magnification and the accuracy is low.

Therefore, recently, in order to solve the problem of such a manual magnification calculation method, a magnification measuring machine having a projection magnification display function is disclosed in, for example, "Jitsuko Sho 63-15".
876 ".

FIG. 2 is a schematic perspective view showing a structural example of this type of magnification measuring machine. In FIG. 2, the projection lens 1 and
The document holder 2 and the lamp house 3 are held by a column 5 attached to a base 4, and the document 6 mounted on the document holder 2 is illuminated with light from a light source provided in the lamp house 3, The image (pattern) is projected by the projection lens 1 onto the layout mount 7 placed on the surface of the base 4.

At this time, the projection lens 1, the document holder 2 and the lamp house 3 are constructed so as to be movable up and down along the support column 5, so that the document 6 can be moved in the same manner as a known photo enlarger. The image (design) can be enlarged or reduced to an arbitrary size over a predetermined range and projected on the layout mount 7.

Further, the moving positions of the projection lens 1 and the original holder 2 along the support column 5 at this time are configured to be measurable by a linear encoder, and the distance between the surface of the layout mount 7 and the projection lens 1 is The magnification determined by the ratio of the distance between the document holder 2 and the projection lens 1 is calculated, and this magnification is displayed on the magnification display 8 as the magnification of the finished image with respect to the document image.

Therefore, in the magnification measuring machine M,
The document 6 is set on the measuring machine, the image (design) of the document 6 is projected on the layout mount 7, and the image (design) drawn there
By changing the size of the projected image so that the projected image (pattern) and the projected image match, and by reading the projection magnification when the two match, the required magnification can be easily obtained. This eliminates the need for the measurement work using the ruler, calipers, etc. described above, so that the magnification can be obtained with high accuracy.

However, the method using such a magnification measuring machine has the following problems.

That is, when the original 6 is projected (for example, in the case of a transparent original), the projection magnification (8%, for example, 248%) displayed on the magnification display 8 is projected to project the original 6.
Can be used as is as the magnification of the finished image with respect to the original image.

However, when the original document 6 cannot be projected (for example, in the case of a reflective original document), equipment dedicated for the original document is separately prepared to obtain the magnification, or the original document 6 and the layout mount sheet 7 are exchanged and the layout mount sheet 7 is replaced. Have been adopted to obtain the magnification. When the layout mount 7 is projected, the magnification display 8 is used to project the layout mount 7.
The projection magnification displayed on the screen cannot be used as it is as the magnification of the finished image with respect to the original image, and the projection magnification displayed on the magnification display 8 is back-calculated by handwriting or calculator calculation to finish the original image. We are looking for image magnification. For example, when the projection magnification displayed on the magnification display 8 is 40.3%, 1 / 0.403 = 2.48 =
248%, which is calculated.

However, in the case of preparing the former dedicated equipment, there are problems in terms of the cost, space, and the work load to reach the dedicated machine.

On the other hand, in the case of projecting the latter layout mount 7, since the magnification is an inverse number, it is necessary to recalculate the projection magnification displayed on the magnification display 8 by handwriting, calculator calculation or the like. ..

Further, it is necessary to process a large number of magnification measurement operations at one time, and if the calculation is performed once, a large work load will result and time loss will increase.

Further, it is considered that a calculation error may occur at the time of recalculation, and it is difficult to find the error in the scanner section of the next process, and the next retouching section (scanner according to the allocation is used). It is first discovered when the disassembled film is stuck in place). As a result, a large amount of time and material costs are wasted, and the next proof printing process cannot be performed until the mistake is corrected, and the image (pattern) is lost due to only one calculation error.
The overall delivery time will be delayed.

Furthermore, when a large number of magnifications are measured at one time, the printer (printing means) outputs the data to save the labor. However, if the reciprocal is output, it is necessary to rewrite all the data. Mistakes also occur in the process. Further, when measuring a magnification by mixing a document that can be projected and a document that cannot be projected, it is necessary to correct a part of the printer output, but a mistake occurs that the corrected portion is wrong.

[0019]

As described above, in the conventional magnification measuring device, when projecting the layout mount, it is necessary to separately prepare dedicated equipment or perform a separate calculation. There is a problem that not only the cost becomes high and the space becomes large, but also the work load and time loss increase.

The present invention has been made to solve the above problems, and its purpose is not only when projecting a document, but also when projecting a layout mount. It is possible to use the displayed magnification as it is as the magnification of the finished image with respect to the original image without separately preparing and separately calculating, thus reducing the cost, the space and the work load. Another object of the present invention is to provide an extremely reliable magnification measuring device capable of reducing time loss.

[0021]

In order to achieve the above object, according to the present invention, a projected image of a document image or a layout mount image is made to coincide with a layout mount image or a document image, whereby a document image In a magnification measuring device designed to obtain the magnification of the finished image, a light source box containing a light source for projection, a loading rack on which a document or a layout mount is loaded, a projection lens, a layout mount or a document are placed. Projection plates are sequentially arranged, and a light source box,
It is configured so that the loading rack and the projection lens are integrally movable in the opposite direction toward the projection plate to adjust the projection magnification, and the image of the original document or the layout mount loaded on the loading rack is projected on the projection plate surface. An image projecting means for projecting, a distance detecting means for detecting the distance from the projection plate surface to the loading rack or the projection lens, and outputting a distance signal corresponding to the distance, and an object to be loaded on the loading rack is a document or a layout mount. Which one of the two is specified as the original mode or the layout mount mode by the operator's operation, and the distance signal from the distance detecting means is input, and a predetermined calculation is performed based on the mode designated by the mode specifying means. And a display means for displaying the finishing magnification calculated by the computing means. To have.

Here, in particular, as the calculation means, the projection magnification of the image of the original document or the layout mount projected on the projection plate surface is calculated based on the distance signal from the distance detection means, and is designated by the mode designation means. When the selected mode is the original mode, the calculated projection magnification is output as the magnification of the finished image with respect to the original image, and when the mode designated by the mode designating means is the layout mount mode, the calculated projection magnification is calculated. Is calculated and the calculated value is output as the magnification of the finished image with respect to the original image.

Further, a printing means for printing the projection magnification calculated by the computing means is added if necessary.

[0024]

Therefore, in the magnification measuring apparatus of the present invention, when the original or the layout mount is loaded on the loading rack of the image projection means and the layout mount or the original is placed on the projection plate, the loaded original is loaded. Alternatively, the layout mount is illuminated with light from a light source provided in the light source box, and the image (pattern) is projected by the projection lens onto the layout mount or the original placed on the surface of the projection plate. Then, the projection lens, the loading rack, and the light source box are integrally moved in the opposite direction of the projection plate to adjust the projection magnification, and the image of the original or the image of the layout mount is the image of the layout mount or It will stop when it matches the original image.

On the other hand, at this time, the moving distance between the projection lens and the loading rack is detected by the distance detecting means, and the distance signal corresponding to the distance is inputted to the calculating means. At the same time,
A manuscript mode or a layout mount mode corresponding thereto is designated by an operator's operation. Thereby, the calculation means, based on the distance signal from the distance detection means and the designated mode, the distance between the projection lens and the surface of the layout mount or the document placed on the projection plate, and the loading rack. A magnification determined by the ratio to the distance from the projection lens is calculated, and the magnification is displayed on the display unit as the magnification of the finished image with respect to the original image.

That is, the calculation means calculates the projection magnification of the image of the original document or the layout mount image projected on the projection plate surface based on the distance signal, and when the designated mode is the original mode, the calculated projection magnification. Is displayed on the display means as the magnification of the finished image with respect to the original image, and when the designated mode is the layout mount mode, the projection magnification calculated above is further calculated backward, and the calculated back value is the magnification of the finished image with respect to the original image. It is displayed on the display means.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a structural example of a magnification measuring device according to the present invention.

In FIG. 1, an image projection apparatus 10 includes a light source box 11 in which a projection light source (not shown) is housed,
A loading rack 12 on which a document or a layout mount is loaded, a projection lens 13, and a projection plate 14 fixed on an operation table, which will be described later, and on which the layout mount or the document is placed are sequentially arranged as illustrated. Then configured. In addition, the projection lens 13
Is the light source box 11 and the loading rack 1 along a groove 16 provided on one side of a support column 15 supported on an operation console described later.
It is movable in the vertical direction toward the projection plate 14 integrally with 2, so that the magnification relationship (projection magnification) with the layout mount or the document placed on the projection plate 14 can be adjusted. ing. Further, inside the light source box 11 of the image projection device 10, for example, a linear encoder which is a distance detecting means (not shown) is provided. This linear encoder is provided with the loading rack 12 or the projection lens 1 from the surface of the projection plate 14.
The distance to 3 is detected, and the distance signal corresponding to the distance is output via the code 17.

On the other hand, on the front side of the operation console 18 located below the projection plate 14, various switch groups 19 for the operator to perform the moving operation of the image projection apparatus 10 and the load on the loading rack 12 are provided. A mode designating switch 20, which is a mode designating means for designating whether the document or the layout mount is the original mode or the layout mount mode,
A mode signal is output via a code 24, and an LE as a display means is provided on the upper surface side of the operation console 18.
A D display 21 is provided. Then, the distance signal from the linear encoder and the mode signal from the mode designating switch 20 are input to the central processing unit 22 which is a calculating means. Further, the LED display 21 and the printer 23 as a printing unit are connected to the central processing unit 22.

Here, the central processing unit 22 calculates the projection magnification of the image of the original or the layout mount image projected on the surface of the projection plate 14 based on the distance signal from the linear encoder,
When the mode designated by the mode designating switch 20 is the original mode, the calculated projection magnification is output as the magnification of the finished image with respect to the original image, and the mode designated by the mode designating switch 20 is the layout mount mode. In this case, the calculated projection magnification is back-calculated and the back-calculated value is output as the magnification of the finished image with respect to the original image.

The LED display 21 is for displaying the finishing magnification calculated by the central processing unit 22.

Further, the printer 23 is for printing the finishing magnification calculated by the central processing unit 22.

Reference numeral 25 is a bellows.

Next, the operation of the magnification measuring device of this embodiment having the above-mentioned structure will be described.

First, the case of projecting an original will be described.

In this case, first, as shown in FIG. 1, an original (for example, a transparent original) 30 is fixed on the upper surface of a transparent glass plate 31 with a tape or the like, and then another transparent glass plate 3 is placed thereon.
After stacking the two, they are loaded (set) on the loading rack 12. At the same time, the layout mount 33 is placed on the projection plate 14.

Next, the original document 30 loaded on the loading rack 12
Is illuminated with light from a light source provided in the light source box 11, and the image (pattern) thereof is projected by the projection lens 13 onto the layout mount 33 placed on the surface of the projection plate 14. Then, the operator operates various switch groups 19 of the operation console 18 so that the projection lens 13,
The loading rack 12 and the light source box 11 are integrally moved in the vertical direction of the projection plate 14 to adjust the projection magnification, and stop when the projected image of the original 30 matches the image of the layout mount 33. To do.

On the other hand, at this time, the projection lens 13 and the loading rack 1
The moving distance of 2 is detected by a linear encoder (not shown), and the distance signal corresponding to the distance is detected by the central processing unit 2
Entered in 2. At the same time, the operator operates the mode designating switch 20 to designate the corresponding original mode or layout mount mode. In this case, since the original 30 is loaded on the loading rack 12, the original mode is designated and the mode signal indicates the central processing unit 2.
Entered in 2.

As a result, in the central processing unit 22, the distance signal from the linear encoder and the mode designating switch 2 are selected.
Based on the mode signal from 0, the projection magnification of the image of the document 30 projected on the surface of the projection plate 14 is calculated. That is, the surface of the layout mount 33 on the projection plate 14 and the projection lens 1
Magnification determined by the ratio of the distance between the loading rack 12 and the projection lens 13 (for example, 248%)
Is calculated. In this case, since the mode signal from the mode designation switch 20 is the original mode, the calculated projection magnification (248%) is directly displayed on the LED display 21 as the magnification of the finished image with respect to the original image. At the same time, it is printed by the printer 23.

Next, the case of projecting the layout mount will be described.

In this case, first, the layout mount 33 is fixed on the upper surface of the transparent glass plate 31 with a tape or the like, and then another transparent glass plate 32 is placed thereon, and then loaded (set) on the loading rack 12. At the same time, a document (for example, a reflection document) 30 is placed on the projection plate 14.

Next, the layout mount 33 loaded on the loading rack 12 is illuminated by the light from the light source provided in the light source box 11, and the image (pattern) is projected on the projection plate 14 by the projection lens 13. It is projected on the original document 30 placed on the surface. Then, the operator operates various switch groups 19 of the operation console 18 to integrally move the projection lens 13, the loading rack 12, and the light source box 11 in the vertical direction of the projection plate 14 to adjust the projection magnification. When the projection image of the image of the layout mount 33 coincides with the image of the document 30, the process is stopped.

On the other hand, at this time, the projection lens 13 and the loading rack 1
The moving distance of 2 is detected by the linear encoder, and the distance signal corresponding to the detected distance is input to the central processing unit 22. At the same time, the operator operates the mode designating switch 20 to designate the corresponding original mode or layout mount mode. In this case, since the layout mount 33 is loaded on the loading rack 12, the layout mount mode is designated, and the mode signal indicates the central processing unit 22.
Entered in.

As a result, in the central processing unit 22, the distance signal from the linear encoder and the mode designating switch 2 are selected.
Based on the mode signal from 0, the projection magnification of the image of the layout mount 33 projected on the surface of the projection plate 14 is calculated. That is, the surface of the original 30 on the projection plate 14 and the projection lens 1
The magnification determined by the ratio of the distance between the loading rack 12 and the projection lens 13 (for example, 40.3).
%) Is calculated. Then, in this case, since the mode signal from the mode designation switch 20 is the layout mount mode, the calculated projection magnification (40.3%) is further calculated backward (1 / 0.403 = 2.48 = 248). %), And its inverse calculation value is the magnification of the finished image with respect to the original image (248
%) Is displayed on the LED display 21 and is printed by the printer 23.

As described above, the magnification measuring apparatus of this embodiment includes the light source box 11 in which the light source for projection is housed, the loading rack 12 into which the original 30 or the layout mount 33 is loaded, the projection lens 13, and the layout mount. 33 or the original plate 30 on which the projection plates 14 are sequentially arranged, and the light source box 1
1, the loading rack 12, and the projection lens 13 are integrally movable in the vertical direction toward the projection plate 14 to adjust the projection magnification, and the original document 30 loaded on the loading rack 12 or the layout mount. The image projection device 10 for projecting the image of 33 onto the surface of the projection plate 14 and the loading rack 12 from the surface of the projection plate 14
Alternatively, the operator operates the linear encoder that detects the distance to the projection lens 13 and outputs a distance signal corresponding to the distance, and whether the load on the loading rack 12 is the original 30 or the layout mount 33. The mode designation switch 20 for designating the original mode or the layout mount mode, and the projection magnification of the image of the document 30 or the layout mount 33 projected on the surface of the projection plate 14 based on the distance signal from the linear encoder, and When the mode designated by the mode designation switch 20 is the original mode, the calculated projection magnification is output as the magnification of the finished image with respect to the original image, and when the mode designated by the mode specification switch 20 is the layout mount mode. Is calculated, the calculated projection magnification is back-calculated and the back-calculated value is taken as the magnification of the finished image with respect to the original image. A central processing unit 22 for outputting,
The central processing unit 22 includes an LED display 21 that displays the finishing magnification calculated by the central processing unit 22, and a printer 23 that prints the finishing magnification calculated by the central processing unit 22.

Therefore, not only when the original 30 is projected, but also when the layout mount 33 is projected, the LED display 21 is displayed without the need for special equipment or calculation. Further, the magnification printed on the printer 23 can be used as it is as the magnification of the finished image with respect to the original image. This allows
Cost reduction, space reduction, workload reduction,
In addition, time loss can be reduced.

That is, when it is not possible to project a document (for example, in the case of a reflection document) as in the conventional case, it is not necessary to separately prepare dedicated equipment to obtain the magnification, so that the cost, space, Further, it is possible to solve problems such as the work load before going to the dedicated machine.

Further, as in the conventional case, the projection magnification displayed on the display is back-calculated by handwriting or calculator calculation.
Since it is not necessary to calculate the magnification of the finished image with respect to the original image, (a) it is necessary to recalculate the projection magnification displayed on the display unit by writing, calculating with a calculator, etc. (b) A great amount of work by calculation The load and the loss of time become large. (C) Due to a calculation error that occurs during recalculation, time,
The material cost is wasted, the next proof printing process cannot be performed until the mistake is corrected, and the delivery time of the entire image (pattern) is delayed. In the case of measurement, if it is output to the printer with the reciprocal number, it will be necessary to rewrite everything, and there will be mistakes in the process, and when measuring the magnification by mixing a manuscript that can be projected and a manuscript that cannot be projected, It is possible to solve various problems such as a mistake that a correction part is wrong when a part of the output is corrected.

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

For example, in the above embodiment, the central processing unit 2
Although the case where the printer 23 for printing the finishing magnification calculated in 2 is provided has been described, this is not necessarily an essential element of the present invention.

Further, in the above embodiment, the central processing unit 22
As an algorithm of the above, first, based on the distance signal from the linear encoder, the projection magnification of the image of the document or the layout mount projected on the surface of the projection plate 14 is once calculated, and then according to the mode designated by the mode designation switch 20. ,
A case has been described where the calculated projection magnification is output as it is, or the calculated projection magnification is back-calculated and the back-calculated value is output to obtain the magnification of the finished image with respect to the original image. However, the present invention is not limited to this. It is needless to say that an algorithm may be used in which the calculation is performed in accordance with the mode designated by the mode designation switch 20 by using the distance signal from to obtain the magnification of the finished image with respect to the original image at once.

For example, the first calculation for calculating the magnification by the ratio of the distance between the surface of the layout mount 33 on the projection plate 14 and the projection lens 13 and the distance between the loading rack 12 and the projection lens 13. The function and the ratio between the distance between the surface of the original 30 on the projection plate 14 and the projection lens 13 and the distance between the loading rack 12 and the projection lens 13 are calculated in the reverse manner of the first calculation function. And a second calculation function for calculating a magnification, and corresponding to a mode designated by the mode designation switch 20.
Alternatively, an algorithm may be used in which the second calculation function is selected and the magnification of the finished image with respect to the original image is calculated at once.

Further, in the above embodiment, the case where the present invention is applied to the vertical type magnification measuring device has been described, but the present invention is not limited to this, and the same applies to the horizontal type magnification measuring device. The effect can be obtained.

Furthermore, in the above embodiment, the distance between the loading rack 12 and the projection lens 13 may be variable. In particular, when the light source box 11 reaches the upper limit of the movement of the support column 15, the distance between the loading rack 12 and the projection lens 13 is reduced to further increase the enlargement ratio, or the projection lens 13 becomes the lower limit of the movement of the support column 15. Even if it reaches, the loading rack 1
The reduction ratio can be further reduced by reducing the distance between 2 and the projection lens 13.

[0056]

As described above, according to the present invention, by matching the projected image of the image of the original or the image of the layout mount with the image of the layout mount or the image of the document, the magnification of the finished image with respect to the original image is increased. In a magnification measuring device designed to obtain the following, a light source box containing a light source for projection, a loading rack on which a document or a layout mount is loaded, a projection lens, a projection mount on which the layout mount or the document is placed are sequentially arranged. The originals loaded in the loading rack are arranged, and the light source box, the loading rack, and the projection lens are integrally configured to be movable in the opposite direction toward the projection plate to adjust the projection magnification. Image projection means for projecting the image of the layout mount onto the projection plate surface, and a distance for detecting the distance from the projection plate surface to the loading rack or the projection lens and outputting a distance signal corresponding to the distance. By inputting the distance signal from the output means, the mode specifying means for specifying whether the load on the loading rack is the original or the layout mount by the operator's operation as the original mode or the layout mount mode, and the distance detection means. A calculation means for performing a predetermined calculation based on the mode designated by the mode designating means to calculate and outputting a magnification of the finished image with respect to the original image; and a display means for displaying the finish magnification calculated by the computing means. According to the above, since it is configured with a printing unit that prints the projection magnification calculated by the calculation unit, special equipment is separately prepared not only when projecting a document but also when projecting a layout mount. The displayed magnification can be directly used as the magnification of the finished image with respect to the original image without any additional calculation. Reduction of cost,
It is possible to provide an extremely reliable magnification measuring device capable of reducing the space, reducing the work load, and reducing the time loss.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnification measuring device according to the present invention.

FIG. 2 is a schematic perspective view showing a configuration example of a conventional magnification measuring machine.

[Explanation of symbols]

10 ... Image projection device, 11 ... Light source box, 12 ... Loading rack, 13 ... Projection lens, 14 ... Projection plate, 15 ... Support,
16 ... Groove, 17 ... Code, 18 ... Operation console, 19 ... Various switch groups, 20 ... Mode designation switch, 21 ... LED display, 22 ... Central processing unit, 23 ... Printer, 24 ...
Code, 25 ... Bellows, 30 ... Manuscript, 31, 32 ... Transparent glass plate, 33 ... Layout mount.

Claims (3)

[Claims] 1. A magnification measuring apparatus configured to obtain a magnification of a finished image with respect to a document image by matching a projected image of the document image or the image of the layout mount with the image of the layout mount or the image of the document. A light source box accommodating a light source for a document, a loading rack on which the original or the layout mount is loaded, a projection lens, a projection plate on which the layout mount or the original is placed, and the light source box. The loading rack and the projection lens are integrally movable in the opposite direction toward the projection plate to adjust the projection magnification, and the image of the original or the layout mount loaded on the loading rack is displayed. An image projecting means for projecting on a projection plate surface, and a distance detector for detecting a distance from the projection plate surface to the loading rack or the projection lens and outputting a distance signal corresponding to the distance. Means, a mode designating means for designating whether the loaded material on the loading rack is a document or a layout mount as a document mode or a layout mount mode by an operator's operation, and a distance signal from the distance detection means is inputted. Then, a calculating means for performing a predetermined calculation based on the mode designated by the mode designating means, calculating and outputting a magnification of the finished image with respect to the original image, and a display means for displaying the finishing magnification calculated by the computing means And a magnification measuring device comprising: 2. The calculation means calculates a projection magnification of an image of a document or a layout mount projected on the projection plate surface based on a distance signal from the distance detection means, and the mode designating means calculates the projection magnification. When the designated mode is the original mode, the calculated projection magnification is output as the magnification of the finished image with respect to the original image, and when the mode designated by the mode designating means is the layout mount mode, The magnification measuring device according to claim 1, wherein the calculated projection magnification is back-calculated and the back-calculated value is output as the magnification of the finished image with respect to the original image. 3. The magnification measuring apparatus according to claim 1, further comprising a printing unit that prints the projection magnification calculated by the computing unit.