JPS63275910A - Analyzing apparatus of magnified image by projector - Google Patents

Abstract

PURPOSE:To enable the simple and highly precise implementation of evaluation and measurement of a screen image, by making a scan on a screen in two directions perpendicular to each other by a line sensor to take in two-dimensional picture data and by comparing the data with a reference pattern. CONSTITUTION:A work piece to be the basis of a substance to be inspected is put on a stage 7 and a magnified image thereof is formed on a screen glass plane 5. Successively, the frame body of a contact-type linear sensor 9 is moved to the right and left. In accordance with predetermined pitch signals from a linear reading pickup element 14 which is moved together on the occasion, a linear magnified image is taken in from the sensor 9. An image signal of each pitch thus obtained and the pitch signal from the linear reading sensor side are sent to a magnified image analyzer 17 so as to obtain two-dimensional picture data on the screen glass plane 5, and the data are displayed on CRT 18. Next, the substance 8 to be inspected is put on the stage 7, the same operation is conducted, the image thus obtained is analyzed, and display is made on CRT 18. By this method, a difference in the image and its position from the magnified image of the reference work piece can be known at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for analyzing an enlarged image of a screen in a projector.

[Conventional technology]

Conventionally, in order to measure and evaluate the shape of a test object using a projector, a chart or photograph of the test object drawn accurately at the measurement magnification as shown in Figure 3 is pasted on a screen and an enlarged projection of the test object is performed. The best way was to compare the images on the screen.

[Problem that the invention seeks to solve]

In the conventional technology as described above, an accurate enlarged chart or photograph must be created in order to perform shape evaluation measurement, and the comparison evaluation measurement is performed by humans with the naked eye, and the comparison difference (error) is calculated. 0 takes time to detect as a numerical value
As long as human beings are involved, there is a problem that human errors cannot be avoided.6 In order to solve these problems, the present invention aims to easily and accurately perform evaluation measurements of screen images. purpose.

(Means for Solving the Problems) For the above purpose, the present invention includes a line sensor 9a that scans the projection screen in one direction as shown in FIG.
The moving member 10 is moved in a direction perpendicular to the above one direction.
．． 11.12.13, and a linear reading sensor 14.15 for reading the position of the line sensor in the orthogonal direction is provided, and the projected image of the pinched object is moved left and right (or up and down) while being captured by the line sensor. By that,
The image on the imaging glass of the projection screen section is obtained as a two-dimensional image signal. By comparing and analyzing the two-dimensional image signal obtained in this way with the accurate enlarged image signal stored in advance, the error position (location) of the object can be determined.
and its quantity value can now be detected.

[For production]

In the present invention, a projected image is linearly captured by a line sensor, which is a photoelectric element, and is moved in a direction perpendicular to the scanning direction. At this time, the line sensor captures images at regular intervals based on signals from the linear reading sensor that reads the position in the orthogonal directions. These images are taken into an analyzer and displayed on a CRT or plotter (images based on the overall image and images of the object to be inspected) separated by color (or extracted), and error values are displayed. It is also possible to print out the positional dimensions of each image point and the error value of the object to be inspected on the printer.

〔Example〕

FIG. 1 shows a first embodiment of the present invention, in which a screen frame 2 is attached to a projector main body 1 with a bracket 3 and mounting screws 4, and a screen glass 5 is fixed to the screen frame 2. An enlarged image of the object 8 placed on the stage 7 is projected by the projection lens 6 at the correct magnification. A frame body 9 of a close-contact CCD linear sensor is fitted to the screen frame 2 and fitted to a left-right movement guide 10. A left-right screw 11 is rotatably fixed to the guide 10 by a bearing 12, and a frame 9 is screwed onto the left-right screw 11.

This screw 11 is rotated by a left-right motor 13.

As the screw 11 rotates, the CCD linear sensor 9 is moved left and right along the screw 11. The frame body 9 is stopped from rotating by grooves at the top and bottom of the guide 10. The frame 9 of the CCD linear sensor and the linear reading sensor big amplifier unit 14 are connected by a joint bin 16, and the configuration is such that the horizontal movement of the linear sensor can be read by a linear reading scale 15. The pink-up section 14 and the linear reading scale 15 constitute a so-called position encoder. 17 is C
CD linear sensor 9, position encoder 14, 15 as a linear reading sensor (Actually outputting the signal is by reading the scale photoelectrically and outputting a pulse corresponding to the scale graduation at the pink-up section 14.) 18 is a CRT that performs image evaluation based on the output thereof, and 19 is a printer that prints out the evaluation values.

The operation of the enlarged image analysis device configured as described above will be explained below.

First, a workpiece, which is the basis of the object to be inspected, is placed on the stage 7, and an enlarged image is accurately created on the screen glass 5 using the measurement enlargement projection lens 6. Subsequently, the frame 9 of the contact type linear sensor is moved left and right by the left and right movement guide 10, screw 11, and motor 13. A linear enlarged image is captured from the linear sensor 9 while following a predetermined pitch signal (in synchronization with the pulse) from the linear reading pink-up unit 14 which is also moved at this time. Since the electrical scanning speed of the linear sensor 9 is extremely fast compared to the normal movement of the linear sensor 9, two-dimensional images can be captured with virtually no problem in accuracy. The captured image signals of each pitch (according to 9) and the pitch signals from the linear reading sensor side (according to 14) are sent to an enlarged image analyzer 17,
Dimensional image data is obtained, image analyzed, and displayed on the CRT 18 in a prespecified color. Next, the test object 8 is placed on the stage and the same operation is performed, the image is analyzed in the same way as before, and it is displayed on the CRT in a specified color different from before.

As a result, the difference between the image and the enlarged reference workpiece image and the difference in its position can be known at a glance. Further, these numerical values and differences (errors) are printed out by the printer 19. Although it is not shown in this figure, it is also possible to extract the enlarged image as a figure to the outside depending on the amount added to the plotter.

FIG. 2 shows a second embodiment of the present invention, in which a linear reading sensor 14 is used to read the amount of horizontal movement of the CCD linear sensor 9.
A rotary encoder is used in place of the position encoder 15, and the horizontal movement screw 11 is made more precisely than the one in Fig. 1 (for example, a precision ball screw may be used), and a high-resolution high-resolution screw is installed at the rotating end. A precision rotary encoder 20 is attached. The pulses obtained from the rotary encoder 20 every predetermined rotation amount correspond to the horizontal position of the linear sensor 9, so the following movements are the same as when using the position encoder (linear) described above, so they will be omitted. .

Note that instead of the work that is the basis of the object to be inspected, a drawing pattern that is the basis of the object to be inspected may be directly obtained on the CRT from drawing data such as CAD.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to perform all image capture, analysis, evaluation, etc. by electrical processing, so various errors caused by human intervention (e.g., errors in chart creation, The effect is that no error e tc) occurs at all. In addition, it is extremely easy to store and retrieve all data and conditions electronically (magnetically), which leads to automated measurements and labor savings.Furthermore, by using communication lines, it can be done remotely. It can also be applied to sending measurement data to factories and users.

This device is made separately and independently from the main body, so installation and
Since it is easy to remove, it can be installed according to the user's needs, or even if it is purchased separately and used on a previously purchased machine, there is no risk of any performance problems.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are diagrams showing a complete system diagram (a) of an embodiment of the apparatus according to the present invention and a side view of the front part of the projector (b), and FIG. 2 is a diagram showing a system according to the second embodiment. FIG. 3, a partial view of the vicinity of the screen, is a diagram of a conventional shape measurement evaluation chart. [Explanation of symbols of main parts]

Claims (1)

[Claims] A device for analyzing a projected image on a screen held in a screen frame detachably attached to a projector main body, comprising: electrically scanning the screen in one direction to obtain an image signal; an image detection device that moves the line sensor in a direction perpendicular to the one direction to capture two-dimensional image data on the screen; and a reference pattern and an image detection device that captures two-dimensional image data on the screen. An analysis device comprising: a comparison device for performing comparative measurements with an image of a specimen;