JP2000244794A - Plural magnification image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plural magnification image pickup device capable of simultaneously obtaining the plural images of different magnifications by a relatively simple configuration. SOLUTION: This device is provided with a first lens 2 for forming the image of a traveling object 1, a branching optical system 9 provided with a beam splitter 4 provided on the tilt to the optical axis 3 of the first lens 2, a second lens 5 for focusing light reflected by the beam splitter 4 and a second line image sensor 7 for receiving the light of the second lens 5 and a first line image sensor 6 for receiving the light passing through the bean splitter 4 of the branching optical system 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-magnification image pickup apparatus for obtaining a plurality of images having different magnifications from the same subject.

[0002]

2. Description of the Related Art Conventionally, the following method has been used to obtain a plurality of images having different magnifications from the same subject. Use a zoom or interchangeable lens with your camera. A part of an image of a CCD or the like obtained from a camera is electrically enlarged or reduced.

[0003]

The above-mentioned technologies have the following problems. 1) When using a zoom lens or interchangeable lens To change the image magnification, mechanically move from wide-angle to telephoto in the case of a zoom lens, and exchange the lens of the camera when exchanging the lens. take time. Only one image can be obtained at a time from the wide-angle to telephoto images. Generally, zoom lenses are large, heavy and expensive. Interchangeable lenses also require several interchangeable lenses. 2) Enlarging a part of an image In order to enlarge a part of an image of a CCD or the like, the image becomes inevitably coarser as the enlargement ratio is increased, and a clear image cannot be obtained.

The present invention has been made in view of the above problems, and has as its object to provide a multi-magnification image pickup apparatus capable of obtaining a plurality of images having different magnifications with a relatively simple apparatus.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a first lens for forming an image of a moving subject, and a beam provided to be inclined with respect to the optical axis of the first lens. A splitting optical system including a splitter, a second lens that forms an image of the light reflected by the beam splitter, and a second line image sensor that receives light from the second lens, and passing through the beam splitter of the splitting optical system A first line image sensor that receives the reflected light.

[0006] An image having the magnification of the first lens is incident on the first line image sensor through the beam splitter.
An image having a magnification of the product of the magnification of the first lens and the second lens is incident on the second line image sensor. The line image sensor scans the subject from left to right to obtain this one-dimensional image. However, when the subject is relatively moved in the direction perpendicular to the scanning direction, the currently obtained one-dimensional image and the previously obtained one-dimensional image are obtained. This is different from the one-dimensional image. A two-dimensional image can be obtained by arranging the one-dimensional images repeatedly obtained in this manner in the order in which they were obtained. In addition,
Although the image entering the second line image sensor is reflected once by the beam splitter, the two-dimensional image obtained by the above method is a normal image that is not inverted. In this way, it is possible to simultaneously obtain images with different magnifications for the traveling object, the number of the beam splitters + 1.

According to the second aspect of the present invention, a first lens for forming an image of a subject, a beam splitter provided to be inclined with respect to an optical axis of the first lens, and an image of light reflected by the beam splitter. A splitting optical system including a second lens, a mirror provided at an angle to the optical axis of the second lens, and a second two-dimensional image sensor for receiving light from the mirror, and a beam splitter of the splitting optical system And a first two-dimensional image sensor that receives light passing through the first two-dimensional image sensor.

[0008] An image of the magnification of the first lens is incident on the first two-dimensional image sensor through the beam splitter.
An image having a magnification equal to the product of the magnifications of the first lens and the second lens is reflected by the mirror and enters the second two-dimensional image sensor.
Since the image incident on the second two-dimensional image sensor is reflected by the beam splitter and the mirror, an image in the same direction as the first two-dimensional image sensor is incident. In this way, images with different magnifications for the subject can be obtained at the same time as the number of beam splitters + 1.

According to a third aspect of the present invention, a first lens for forming an image of a subject, a beam splitter provided to be inclined with respect to the optical axis of the first lens, and an image of light reflected by the beam splitter. A branch optical system having a second lens and a second two-dimensional image sensor that receives light from the second lens; a first two-dimensional image sensor that receives light that has passed through a beam splitter of the branch optical system; An image reversing device for electrically reversing the image output from the branching optical system up and down.

The present invention is different from the second aspect in that the image of the branch optical system is inverted upside down using a mirror, but is electrically inverted by an image inverting device, and the other is the same. .

According to a fourth aspect of the present invention, the first line image sensor or the second line image sensor, or the first two-dimensional image sensor or the second two-dimensional image sensor is replaced with a color sensor for detecting a color.

By replacing the image sensor with a color sensor as described above, the image sensor can be used as a colorimeter for measuring the color of a specific portion of this screen while viewing the entire screen on one screen.

According to a fifth aspect of the present invention, a slit is provided at the position of the first line image sensor or the second line image sensor, or the first two-dimensional image sensor or the second two-dimensional image sensor, and light transmitted through the slit is provided. By a diffraction grating or a spectral prism, and the first line image sensor or the second line image sensor,
Alternatively, the light is incident on the first two-dimensional image sensor or the second two-dimensional image sensor.

By providing a slit and a diffraction grating or a spectral prism in front of the image sensor in this way, it can be used as a spectral colorimeter for measuring the color of a specific portion of this screen while viewing the whole on one screen. Can be.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention. The subject 1 is a web in which the same pattern is repeatedly printed by a plate cylinder or the like and runs. This subject 1
A first lens 2 having its optical axis 3 perpendicular to the
A first line image sensor 6 is arranged at an image forming position of the first lens 2. A beam splitter 4 is provided on the optical axis 3 between the first lens 2 and the first line image sensor 6, and a second lens 5 that forms an image of the light separated by the beam splitter 4 and is arranged at this image forming position. The second line image sensor 7 is provided. The beam splitter 4, the second lens 5, and the second line image sensor 7 constitute a branch optical system 9. This branch optical system 9 is provided between the first lens 2 and the first line image sensor 6.
One or more are provided. The outputs of the first line image sensor 6 and the second line image sensor 7 are input to the image processing device 10 and the processed image is displayed on the display 1.
1 is displayed.

With this configuration, the first line image sensor 6 can obtain an image of the magnification of the first lens 2, and the second line image sensor 7 can obtain an image of the magnification of the product of the first lens 2 and the second lens. An image is obtained. These images are processed by the image processing device 10 and displayed on the display 11 individually or simultaneously. The magnification of each of the lenses 2 and 5 is determined so that an image of a desired magnification can be obtained.

Since a running image enters each of the line image sensors 6 and 7, a two-dimensional image can be obtained by combining the image on the current scanning line and the image on the previous scanning line. Although the image inverted by the beam splitter 4 is incident on the second line image sensor 7, since the subject 1 is traveling and the line image sensor is used, the second line image sensor 6 obtains the second image. An image in the same direction as the direction of the two-dimensional image is obtained from the two-dimensional image of the second line image sensor 7.

FIG. 6 shows the first line image sensor 6 and the second line image sensor 6.
FIG. 4 is a diagram illustrating that two-dimensional images obtained by a line image sensor are oriented in the same direction. As shown in the figure, when the object S is viewed, the image viewed at the position A and the image viewed at the position B once reflected by the mirror are upside down. Therefore, if a two-dimensional image sensor (two-dimensional CCD) is used, an operation of inverting the image of the two-dimensional image sensor located at the position of the second line image sensor 7 up and down is required. In order to avoid this, mirror reflection is performed twice. However, CC
When the subject relatively moves in a direction perpendicular to the scanning direction of the line sensor using a D line sensor (one-dimensional image sensor), only point K in the figure is viewed. That is, as shown in FIG. 7, each pixel of the CCD sees the distribution of brightness in the horizontal direction (direction perpendicular to the paper surface) at the K position. Next, the subject moves,
When the point K1 comes to the position of the K point, the CCD displays the horizontal brightness distribution of the K1 point at that position. K1 that has moved next
The point is displayed, and further the K2 point is displayed. By repeating this to form a two-dimensional screen, there is no upside-down reversal and a normal two-dimensional image can be obtained.

Next, a second embodiment will be described with reference to FIG. In the present embodiment, the subject 1 may be stationary,
You may be running. The image sensor uses the first two-dimensional image sensor 16 for the image formation of the first lens 2,
The second two-dimensional image sensor 17 is used for image formation of the second lens 2. Further, a mirror 8 is provided after the second lens 5 in order to normally rotate the image inverted by the beam splitter 4. Others are the same as the first embodiment.

Next, a third embodiment will be described with reference to FIG. In the present embodiment, the image of the second two-dimensional image sensor 17 is inverted using the mirror 8 in the second embodiment, but the image is electrically inverted in the image processing apparatus 10. Others are the same as the second embodiment.

Next, a fourth embodiment will be described. In the present embodiment, any one of the first line image sensor 6 and the second line image sensor 7 in the first to third embodiments,
Alternatively, one of the first two-dimensional image sensor 16 and the second two-dimensional image sensor 17 is replaced with a color sensor for identifying a color, an image of the image sensor is displayed on the display 11, and the image of the image of the image sensor is displayed. It can be applied as a colorimeter that measures the color of a specific part.

FIG. 4 is a diagram showing the configuration of the fourth embodiment, FIG. 5 shows the configuration of a colorimeter, and FIG.
(B) is XX sectional drawing of (A). The colorimeter is R,
Assuming that G and B are red, green and blue, respectively, a light receiving element having an R filter for passing only R and blocking G and B, a light receiving element having a G filter for passing only G and blocking R and B, B A light-receiving element having a B filter for passing only R and G and blocking R and G is arranged as shown in FIG. 3A, thereby detecting R, G, B or a combined color thereof.

FIG. 4 differs from FIGS. 1 to 3 in that the first line image sensor 7 or the second two-dimensional image sensor 17 of the branch optical system 9 is replaced by a colorimeter 18, and the other parts are the same. The color of the subject 1 at the position indicated by the circle of Mt. Fuji is detected, and the entire image of Mt. Fuji is also shown to clearly indicate at which position the colorimeter indicates the color. Color measurement unit is 1st
The minute area in the image can be measured by the magnification of the product of the lens 2 and the second lens 5.

Next, a fifth embodiment will be described. In the present embodiment, any one of the first line image sensor 6 and the second line image sensor 7 in the first to third embodiments,
Alternatively, a slit is provided at the position of either the first two-dimensional image sensor 16 or the second two-dimensional image sensor 17, and the light is separated into a spectrum using a diffraction grating or a spectral prism. Either the image sensor 6 or the second line image sensor 7, or the one provided with the first two-dimensional image sensor 16 or the second two-dimensional image sensor 17, displays an image on the display 11, and obtains an image obtained by the image sensor. It can be applied as a spectroscopic colorimeter that spectroscopically analyzes the color of a specific part inside. The configuration of the present embodiment is obtained by replacing the colorimeter 18 in FIG. 4 with a spectral colorimeter shown in FIG.

FIG. 8 shows a spectral colorimeter provided with a diffraction grating 14. In the first to third embodiments, the first line image sensor 6 or the second line image sensor 7
Or a slit 12 is provided at the position of either the first two-dimensional image sensor 16 or the second two-dimensional image sensor 17, and the light passing through the slit 12 is collimated by a collimator lens 13, The light is separated by the collimator lens 13 and the light is separated by the collimator lens 13 into either the first line image sensor 6 or the second line image sensor 7 or the first two-dimensional image sensor 16 or the second line image sensor 16.
The image is formed on one of the two-dimensional image sensors 17.

In the first to third embodiments, the case where two branch optical systems are provided has been described. Regarding illumination, a line image sensor is used when a subject is traveling, and is a continuous illumination by a fluorescent lamp or the like. When the subject is traveling with the two-dimensional image sensor, a strobe is used. When the subject is stationary, the strobe or continuous lighting may be used.

[0027]

As is clear from the above description, the present invention has the following effects. A wide-angle image, a normal image, a telephoto image, and the like can be obtained, and the switching can be performed instantaneously. Lighter, smaller and less expensive than zoom lenses. A wide-angle image, a normal image,
Telephoto images can be displayed at the same time. Both the wide-angle image and the telephoto image are full-screen images of a CCD image sensor and are not electrically enlarged or reduced, so that a precise image can be obtained. When monitoring a running printed matter, it is possible to detect the color of a specific portion of the printed matter while looking at the wide screen.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a colorimeter.

FIG. 6 is an explanatory diagram in which a two-dimensional image of a second line image sensor becomes a normal image.

FIG. 7 shows components of a CCD line sensor.

FIG. 8 is a diagram showing an optical system which is used as a spectral colorimeter using a diffraction grating.

[Explanation of symbols]

 Reference Signs List 1 subject 2 first lens 3 optical axis 4 beam splitter 5 second lens 6 first line image sensor 7 second line image sensor 8 mirror 9 branch optical system 10 image processing device 11 display 12 slit 13 collimator lens 14 diffraction grating 16th 1 2D image sensor 17 2D image sensor 18 Colorimeter

Claims (5)

[Claims] 1. A first lens that forms an image of a traveling subject, a beam splitter that is provided to be inclined with respect to the optical axis of the first lens, and a second lens that forms an image of light reflected by the beam splitter. , And a branch optical system having a second line image sensor that receives light from the second lens, and a first line image sensor that receives light that has passed through a beam splitter of the branch optical system. A multi-magnification image pickup device characterized by the following. 2. A first lens for forming an image of a subject, a beam splitter provided at an angle to the optical axis of the first lens, a second lens for forming an image of light reflected by the beam splitter, A splitting optical system having a mirror provided to be inclined with respect to the optical axis of the second lens, and a second two-dimensional image sensor for receiving the light from the mirror, and a light passing through a beam splitter of the splitting optical system. Incident first
And a two-dimensional image sensor. 3. A first lens for forming an image of a subject, a beam splitter provided at an angle to the optical axis of the first lens, a second lens for forming an image of light reflected by the beam splitter, and The second lens which receives the light of the second lens
A branching optical system having a two-dimensional image sensor, a first two-dimensional image sensor that receives light that has passed through a beam splitter of the branching optical system, and an image that electrically inverts an image output from the branching optical system And a reversing device. 4. The method according to claim 1, wherein the first line image sensor or the second line image sensor, or the first two-dimensional image sensor or the second two-dimensional image sensor is replaced with a color sensor for detecting a color. 3. The multiple magnification image capturing apparatus according to any one of 3. 5. A slit is provided at a position of the first line image sensor or the second line image sensor, or the first two-dimensional image sensor or the second two-dimensional image sensor. The light is split by a prism and is incident on the first line image sensor or the second line image sensor, or the first two-dimensional image sensor or the second two-dimensional image sensor. A multi-magnification image capturing apparatus according to any one of the above.