JP2696243B2 - Magnification measuring method and apparatus having video signal projection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a print layout designation sheet (hereinafter, referred to as a designated sheet) used when creating a printed matter such as a photograph or an illustration (hereinafter, referred to as a print manuscript). The present invention relates to a magnification measuring method and apparatus having a video signal projection mechanism for measuring a magnification of a reduction or an enlargement of a photograph or an illustration.

(Prior Art) Conventionally, in order to measure the magnification of a printed document, a light source irradiates the printed document with a light source, and projects an image of the printed document onto a figure drawn on designated paper placed on a work table through a lens. And adjust both sizes. To make the image larger or smaller, move the lens away from or closer to the workbench.
At this time, the magnification is calculated based on the distance between the designated sheet placed on the workbench and the lens and the focal length of the lens. The distance between the lens and the printed document is calculated based on the focal length and magnification of the lens. In this case, the following calculation formula is used.

Measurement magnification = Distance between designated paper and lens (mm) ÷ Lens focal length (mm) -1 Distance between lens and print original (mm) = (Measurement magnification + 1) ÷ Measurement magnification x Lens focal length (mm) As described above In order to match the projected image of the printed document with the graphic drawn on the designated paper, the distance between the designated paper and the lens must be changed mechanically, and at the same time, the distance between the lens and the printed document must be changed. Further, the range of the measurement magnification can be increased by mechanically moving the distance between the designated paper and the lens.

(Problem to be Solved by the Invention) According to the above-described conventional technology, the moving distance is limited in work and design. Further, in order to expand the measurement magnification range within a certain lens movement range, it is necessary to prepare a large number of lenses having different lens focal lengths and exchange lenses according to the measurement magnification. Further, if a lens having a short focal length is used, only a part of the printed document can be projected, or the projected image is distorted, so that the focal length of the lens to be used is limited by the size and magnification of the printed document. Also,
When an image of a print document is projected on a figure drawn on a designated sheet placed on a work table, only the lens as an optical system is used, so that the aspect ratio is always the same. For this reason, if the vertical and horizontal ratios of the figures drawn on the designated paper are not the same, the figures of the projected image cannot be matched, so it is necessary to measure the magnification from the printed original. Very difficult. Further, since the brightness of the image projected on the designated paper is inversely proportional to the square of the magnification, it is difficult to match the projected image with the figure drawn on the designated paper because it is bright at a low magnification and dark at a high magnification. There were problems such as.

(Means for Solving the Problems) However, according to the present invention, a document is converted into a video signal, which is further converted as an image memory, the image memory is reduced and enlarged, and further converted into a video signal again. Since the optical signal is projected, the above-mentioned problems can be completely eliminated, and a quick and accurate measurement can be realized.

That is, according to the present invention, a document whose magnification is to be measured is converted into a video signal, and further, the image memory is reduced or enlarged.
This is a magnification measuring method having a video signal projecting mechanism for converting the processed image memory into a video signal, further converting the processed image memory into an optical signal, projecting and forming an image, and calculating an enlargement / reduction ratio in the processing. Also, the invention of the device is a device for converting a document whose magnification is measured into a video signal, converting the video signal as an image memory, reducing or enlarging the image memory, converting the image memory into a video signal again, and outputting the video signal. A video signal projection device comprising: a device, a device for converting a video signal into an optical signal, and projecting the optical signal on a work table; and a device for controlling the device, calculating a magnification, and displaying the magnification. It is a magnification measuring device having a mechanism.

As the device for converting an original into a video signal, a known device using reflected light or transmitted light can be used. In addition, a device that converts a video signal as an image memory and a video magnification changing device that uses a commonly used monitor television, an arithmetic control device, and a keyboard thereof are used.

There are video camera systems, CCD camera systems, image scanner systems, rotary drum scanner systems, etc., as devices that convert print originals for measuring magnification into video signals.
As long as the purpose of converting the print manuscript necessary for the present invention into a video signal can be achieved, what kind to use can be freely selected.

(Operation) That is, the present invention converts an original into a video signal, converts the original into a video memory, changes the magnification, converts this into a video signal, and projects the video signal. That is, the vertical and horizontal reduction and enlargement ratio can be measured by one operation.

Embodiment 1 Next, an embodiment of the present invention will be described with reference to the drawings.

That is, if the image scanner method is described,
Place the printed document 2 flat on the image scanner 1,
The light receiving element is moved to the upper side (or lower side), the density of the print original is measured at regular intervals, and each measurement point of the print original is collected and converted into a video signal. The printed original includes a transmission original of a positive film or a negative film, and a reflection original such as a photograph, an illustration, or a painting. In the case of a transmissive original, the light source is placed on the back side of the transmissive original, and in the case of the reflective original, the light source is placed on the front side and converted into a video signal.

Next, a device for converting the video signal as a video memory, processing the video memory for reduction (enlargement) or the like, converting the video memory into a video signal again, and outputting the video signal, converts the print document input as the video signal into a planar image once. The video memory is converted into a typical video memory, and the video memory is reduced (enlarged) according to an instruction from the keyboard 3. At this time, if the vertical and horizontal ratios of the figures drawn on the designated paper are not the same, the vertical reduction ratio (enlargement ratio) and the horizontal reduction ratio (enlargement ratio) of the video memory are changed separately. or,
If the printed document 2 is too bright or too dark, the density of the image memory is changed so that the brightness becomes appropriate. Further, when the outline of the pattern 2a of the print original 2 is not clear,
The outline of the image memory is changed so as to emphasize the outline of the projected image. Finally, the processed video memory is again converted to a video signal and output.

A device that converts a video signal into an optical signal and projects it on the worktable 4 converts a video signal into an optical signal by a monitor or a display 5 placed on the upper part of the worktable 4, and transmits the light signal to the worktable 4 through a lens 6. An image that has been subjected to processing such as magnification is projected onto a figure drawn on the designated paper 7 placed.

A device for controlling the above-mentioned device, calculating and displaying a magnification, includes a keyboard 3 for input, a monitor 8, a calculating device 9
And a control unit of each device, and a conversion measurement of a video signal from the print original 2, a reduction ratio (enlargement ratio) of a video memory, a contour emphasis instruction, a measurement magnification calculation, a magnification display, a video signal projection instruction, and a magnification measurement. Of all devices necessary for the operation. The measurement magnification is calculated as follows.

Measurement magnification = Video signal input magnification of printed document × Video memory magnification × Video signal projection magnification Since the present invention is configured as described above, when this is used, the printed document 2 is transferred to the video signal conversion device. It is fixed, a video signal input instruction is given from the keyboard 3, and the video signal is simultaneously converted to a video memory. At this time, the video memory
The image 2a of the print original 2 which has been converted into a video signal again and input on the graphic drawn on the designated paper 7 of the work table 4 is projected. The keyboard 3 instructs the reduction rate (enlargement rate) of the video memory so that the projected video and the figure 7a drawn on the designated paper have the same size. The measurement magnification is when the image matches the figure. The adjustment of the brightness of the projected image and the enhancement of the outline of the image are instructed from the keyboard 3 at this time.

Second Embodiment Next, FIG. 2 is a block diagram showing the sequence of the method of the present invention.

That is, the image of the printed document 2 is converted into a video signal 10, the video memory is converted and the video magnification is changed 11 in accordance with a command from the keyboard 3, and the magnification calculation control and the magnification display 12 are performed. The image memory converted is again converted to a video signal 13 and optically processed to obtain a projection video 7a on the designated paper 7.

(Effects of the Invention) In the present invention, the magnification of a printed document is measured by electronically reducing or enlarging a video memory by eliminating a mechanical movable portion. Further, it is possible to measure the magnification of a printed original even for a figure drawn on designated paper having a different aspect ratio, which is impossible with an optical magnification measuring device. Since the brightness of the projected image does not change with the magnification, there are various effects such as efficient measurement of the magnification. The magnification of a projected image can be measured in both black and white and color.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an apparatus according to an embodiment of the present invention,
FIG. 2 is a block diagram showing a signal processing system according to the embodiment.

Claims (2)

(57) [Claims] An original to be measured is converted into a video signal, this is converted into an image memory, this image memory is reduced or enlarged, and the processed image memory is converted into a video signal. The image signal is further converted into an optical signal, the optical signal is projected and formed into an image, and the magnification is measured by calculating the enlargement / reduction ratio in each of the above-described processes, and the magnification is measured. Method. 2. An apparatus for converting a document whose magnification is to be measured into a video signal, an apparatus for converting a video signal as an image memory and reducing or enlarging the image memory, and converting the processed image memory into a video signal again. And a device for converting this video signal into an optical signal and projecting it on a work table, and a device for controlling each of the above devices, calculating a magnification, and displaying the same. A magnification measuring device having a video signal projection mechanism.