JPH08340479A - Image pickup device - Google Patents

Abstract

PURPOSE: To photograph a subject on a film, etc., without using a dedicated lighting means. CONSTITUTION: The subject 6 is photographed by an image pickup part 1 equipped with an optical system 2 and an image pickup element and reproduced by its attached display part 4. Then it display unit 5 of the display part 4 is used to light up the subject 6 to be photographed. Consequently, the display part 4 is usable as a lighting means to simplify the device and lower the price. Further, even if the optical system 2 has unevenness in the quantity of marginal light, it can be corrected and the quality of a photographed image can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup device for picking up an image of a subject such as a negative film, a positive film, or a print document with an image pickup device and reproducing and displaying the image information on a display device.

[0002]

2. Description of the Related Art For example, a video camera is a recording medium (video tape, video floppy, memory card, etc.) without performing processing such as development of image information of a captured moving image or still image, unlike a camera using a silver salt film. ), And the image information that is being shot or the image information that was recorded on the recording medium can be immediately played back on a monitor, etc. Furthermore, recent technological advances have made it possible to reduce the size and weight of video cameras. Therefore, it can be used outdoors for a long time, and it is widely used.

Recently, a small color liquid crystal (LCD) display of about 3 to 4 inches has been integrated into a camera unit,
Attention has been paid to a video camera that uses this liquid crystal display as a viewfinder (which used to use an ultra-compact cathode ray tube) at the time of shooting, and plays back as a small monitor TV after shooting.

On the other hand, there has also been proposed an adapter which allows a negative film or a positive film to be photographed and stores it on a magnetic recording medium (magnetic disk or the like).

This adapter is generally equipped with a holding unit for holding the photographing lens and the subject at a predetermined distance and a placing unit for placing the subject, as well as an illuminating means, and provides uniform light to the rear. By illuminating the film from the inside, it is considered that good shooting can be performed. The illuminating means is composed of a light emitting section using a cold cathode tube or the like, an inverter circuit for supplying power to the light emitting section, a diffusing section for uniformly diffusing light from the light emitting section, and the like.

[0006]

However, in the above-mentioned adapter, it is necessary to illuminate the film (negative film, positive film) in order to perform good photographing, which is economical for the user (user). It will impose a physical burden. Further, when a subject having a uniform luminance distribution is photographed due to the peripheral light amount drop of the photographing lens, there is a problem that the brightness is different between the peripheral portion and the central portion.

It is an object of the present invention to provide an image pickup apparatus capable of photographing an object such as a film without using a dedicated illumination means.

[0008]

[Means and Action for Solving the Problems] The structure for realizing the object of the invention according to the present application is as described in claim 1.
Taking an image of the subject with an imaging unit equipped with an optical system and an imaging device
In an image pickup apparatus that reproduces the image with an attached display unit, the display unit of the display unit is used to illuminate an object to be photographed.

According to this structure, by appropriately setting the display color and the brightness of the display, the display can be used as an illumination lamp without using a separate illumination means. Therefore, the cost and weight of the device can be reduced.

A specific configuration for achieving the object of the invention according to the present application is such that, as described in claim 2, the image pickup section and the display section are connected by a holding means capable of changing the distance between them. I have to.

According to this structure, for example, since the image pickup section and the display section are integrated via the parallel link mechanism, the distance between them, that is, the distance between the subject and the image pickup section, and further the relative position can be freely set. Can be changed.

As a concrete constitution for realizing the object of the invention according to the present application, as described in claim 3, the display is provided with a light emitting type or a light emitting element.

According to this structure, when a liquid crystal display having a light emitting element (for example, a backlight by a cold cathode tube) on the back surface or a CRT included in the light emitting type is used, the display is displayed in white. Then, it can be used as a surface emitting illumination light source.

A specific configuration for achieving the object of the invention according to the present application is such that, when a display device is used as an illumination source for the subject, the peripheral light amount of the photographing lens of the photographing section is changed when the display device is used as an illumination source. Accordingly, a brightness distribution correction means for determining the brightness distribution of the display is provided.

According to this structure, even if the peripheral light amount of the photographing lens is decreased, the correction can be performed on the light emitting side, so that the photographed image has a uniform light amount, and it is necessary to use an expensive photographing lens with improved peripheral light amount. Since it will be eliminated and design restrictions will be relaxed, it will be possible to reduce the product price.

As a specific configuration for achieving the object of the invention according to the present application, as described in claim 5, the brightness distribution correcting means emits light over the entire surface of the display unit of the display unit at a uniform level. Then, after photographing by the image pickup unit, correction is performed so that the image output by the image pickup unit becomes a uniform level.

According to this configuration, the brightness distribution correction 1 is performed.
As one method, the display surface is made to emit light evenly, the degree of peripheral light amount drop of the photographing lens at that time is grasped, and then the display light is moved toward the outside so that the peripheral light amount drop of the lens is corrected. It is possible to control the increase of the light amount, and it is possible to eliminate the influence of the peripheral fall of the photographing lens.

As a concrete constitution for realizing the object of the invention according to the present application, as described in claim 6, the display section is provided with a color correction means for arbitrarily setting the emission color of the display. I have to.

According to this structure, the color temperature of the negative film or the positive film can be converted, the same effect as that of taking a picture with the color filter attached to the subject can be obtained, and the work can be changed to the taste of the user. You can

As a specific configuration for achieving the object of the invention according to the present application, as described in claim 7, the color correction means uses the signal according to a desired coloring level on a photographed image to display the display. Is displayed, and a function for converting the color temperature of the captured image is provided.

According to this structure, for example, when it is desired to lower the color temperature of the photographed image, the correction for strengthening the R signal may be performed, and the color temperature of the photographed image can be arbitrarily converted.

A specific configuration for achieving the object of the invention according to the present application is, as described in claim 8, in which the color correction means includes a color to be removed from a photographed image among colors existing in the subject. In this case, the display is displayed in a color similar to that color.

According to this structure, for example, when it is desired to erase a green line which is not desired to be left in the photographed image in the subject, a display color having a spectral characteristic of green is emitted, so that a specific color on the subject is photographed. It is possible to remove any color from the image.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a front view showing a schematic configuration of an embodiment of an image pickup apparatus according to the present invention.

The image pickup section 1 is provided with a taking lens 2 for taking an image of a subject, and C is provided at the focal position of the taking lens 2.
An image pickup device (not shown) such as a CD is built in. Further, the display unit 4 is attached to the image pickup unit 1 via the connecting member 3. The display unit 4 includes a liquid crystal display 5 (for example, a liquid crystal with a backlight of a cold cathode tube), and can rotate 360 degrees in the vertical direction (arrow A) with the connecting member 3 as a rotation axis as illustrated. During normal shooting, liquid crystal display 5
Is used as a rear surface of FIG. 1 and is used as a viewfinder.

In the configuration of FIG. 1, when the subject 6 is to be photographed by the image pickup unit 1, the subject 6 may be used depending on the situation.
When the illuminance at is insufficient, it is conventionally illuminated by a lighting means such as a lamp. However, in the present invention, the liquid crystal display 5 is used as the illumination means at the time of photographing, instead of separately providing the illumination means. That is, when the illuminance on the subject 6 is insufficient, the display unit 4 is rotated to direct the liquid crystal display 5 to the subject 6 side. If the display color of the liquid crystal display 5 is a high-luminance monochromatic color and the subject 6 is not colored, for example, the entire surface is white, the liquid crystal display 5 can be used as an illumination source.

It should be noted that the brightness of the liquid crystal display 5 is adjusted to the maximum brightness when the entire surface is white, but the brightness can be changed by using a gray or black and white stripe or the like. Furthermore, the atmosphere of the subject 6 can be changed by selecting the display color of the liquid crystal display 5. Further, when flicker occurs on the liquid crystal display 5, it is desirable to perform shooting in synchronization with the light emission timing of the liquid crystal display 5.

As described above, by using the liquid crystal display 5 of the display unit 4 for illuminating the subject 6, it is possible to illuminate the subject 6 without separately providing illumination means.

(Second Embodiment) FIG. 2 is a perspective view showing a second embodiment of the image pickup apparatus according to the present invention.

The image pickup apparatus shown in FIG. 2 mainly comprises an image pickup section 8, a display section 9 and a parallel link mechanism 10. The image pickup section 8 is provided with a photographing lens 11 outside, and an image pickup element (not shown) such as a CCD is provided inside the image pickup section 8. The display unit 9 has a flat plate shape, and the display surface of the liquid crystal display 12 with a backlight is exposed on one surface. The surface of the liquid crystal display 12 and the surface of the display unit 9 are made flush with each other, and this surface serves as a subject placement unit 13, on which a subject 14 such as a negative film or a positive film is placed. In order to guide the subject 14 to the optimum position, a pin-shaped guide 15 is provided upright on the subject placing portion 13.

The image pickup section 8 and the display section 9 have a parallel link mechanism 10
The postures of the image pickup unit 8 and the display unit 9 can be freely changed in the vertical direction because they are connected with each other. The photographing frame of the subject 14 placed on the subject placing section 13 and the taking lens 1
The image pickup section 8 and the display section 9 are positioned relative to each other so that the optical axis of 1 coincides with them.

After that, the image pickup section 8 operates the autofocus mechanism to drive the taking lens 11 to focus on the subject 14. Then, the display unit 9 corrects the brightness. This brightness correction is performed in order to correct the peripheral light amount drop of the taking lens 11. As shown in FIG. 3, the brightness correction drives the liquid crystal display 12 so that the central light amount is low and the light amount increases in the radial direction (light emission).
Then, the uneven brightness caused by the fall of the peripheral light amount of the photographing lens is corrected. The black frame shown in FIG. 3 is a photographing field frame.

The data for brightness correction is performed by the following procedure.

The liquid crystal display 12 is made to uniformly emit light without the subject 14 being placed on the subject placing portion 13. At this time, the taking lens 11 and the liquid crystal display 12 are in a state of facing each other, and the imaging unit 8 can take an image of the liquid crystal display 12. Since the liquid crystal display 12 emits light uniformly, it is possible to obtain information on the distribution of the decrease in the amount of peripheral light of the taking lens 11 by taking an image of this screen. Based on this information, data for correcting the light emission characteristic of the display unit 9 is obtained so that the image obtained by the image pickup unit itself becomes uniform. RA this data
Brightness can be corrected by storing it in a semiconductor memory such as M and reading it during illumination.

Further, according to the needs of the user (user),
By changing the color of the illumination light of the liquid crystal display 12,
Color temperature conversion of a negative film or a positive film becomes possible. For example, when the user wants to lower the color temperature of an image captured by the user, the user himself / herself should use the red (Re
d) The color temperature of the entire image can be lowered by adjusting and increasing the intensity of the signal based on the green (Green) and blue (Blue) signals. It is also possible to set the adjustment level of the color temperature conversion in advance and select the adjustment level from the adjustment levels, so that the color adjustment can be performed.

When the brightness / color correction is completed and the liquid crystal display 12 becomes stable, the subject 14 is photographed. The captured image data is recorded in a recording medium such as a memory in the image pickup unit 8 or a magnetic disk. Further, the recorded image data is output to the liquid crystal display 12 by a user operation.

In order to make the display light of the liquid crystal display 12 uniform, a diffusing plate may be provided in the display section 9 and the subject placing section 13.

According to the embodiment shown in FIG. 2, since the peripheral light amount drop of the taking lens 11 is dealt with by changing the luminance distribution of the taking lens 11, the light amount drop of the taking lens 11 is corrected. The problem that the brightness is different between the peripheral portion and the central portion even when the subject 14 is photographed is solved. Further, the restrictions on the design of the taking lens 11 are alleviated.

(Third Embodiment) FIG. 4 is a perspective view showing an image pickup apparatus according to a third embodiment of the present invention. In the present embodiment, the same reference numerals are used for the same components as those shown in FIG. 2, and thus duplicated description will be omitted below.

In this embodiment, as shown in FIG. 4, the display section 16 on which the liquid crystal display 12 is mounted has a holding section 17 on both sides thereof.
Is held by. An end of the image pickup unit 8 is rotatably coupled to the upper end of the holding unit 17, and bar-shaped legs 18a and 18b are rotatably coupled to the lower end of the holding unit 17. There is. No member attached to the device is provided between the leg portions 18a and 18b, and when the device is installed on a table or the like, the table is exposed between the leg portions 18a and 18b. The portion becomes the subject placing portion 19, and the subject 14 is placed as shown in the figure. This subject 1
The display surface of the liquid crystal display 12 of the display unit 16 is mounted so as to face the subject 14 so that the display unit 16 can be illuminated.

Also in this embodiment, the image pickup section 8 or the display section 16 is provided with a luminance correction means and a color correction means.
Therefore, prior to the photographing of the subject 14, the subject placing portion 19 is illuminated by the liquid crystal display 12 whose entire screen emits light with uniform brightness, and the image pickup portion 8 and the liquid crystal display 1 are also illuminated.
Positioning is performed so that the positional relationship between the two and the subject placing portion 19 becomes appropriate. Focusing on the subject placing section 19 in the state where there is no subject 14, only the subject placing section 19 is photographed by the taking lens 11, and the peripheral light amount drop distribution information is obtained based on the image information. Based on this information, the brightness correction is performed as described above, and the peripheral light amount drop of the taking lens 11 is dealt with by changing the brightness distribution of the taking lens 11. Therefore, the light amount drop of the taking lens 11 is corrected. Becomes
Even if the subject 14 is photographed, the problem that the brightness is different between the peripheral part and the central part is solved.

It should be noted that a specific color in the original can be removed by using the above-mentioned color correction means. For example, if the original of the text printed in black has a green line, to remove this green line from the original, the user selects "green removal mode" to remove the green color from the original. be able to. The details of this principle will be described below.
Although only the “green removal mode” is shown here, a “red removal mode”, a “blue removal mode”, etc. may be provided.

FIG. 5 shows the spectral reflectance of green, and FIG. 6 shows the spectral reflectance of the paper (original) which is the subject and the spectral reflectance of black ink. When the liquid crystal display 12 of the display unit 9 emits illumination light having the spectral characteristic of green (having the characteristic of FIG. 7) onto this sheet, the reflectance of the green portion is as shown in FIG. 9. The black portion shows the spectral distribution characteristic as shown in FIG. That is, the spectral distribution characteristics of the green part and the paper part are the same, and the colors cannot be distinguished.
Therefore, by imaging the paper (original) and converting the green color into white by color temperature conversion, an image in which the green color is removed from the original can be created.

In this embodiment, an image can be created by removing the green color from the original. Although the example of removing the green color from the original has been described, it goes without saying that the color to be removed can be any color and can be selected by the control of the display unit 9. Further, the brightness correction means may emit light so that the original is illuminated with a uniform illuminance so as to gradually darken from the upper side to the lower side of the display screen as shown in FIG.

Although the liquid crystal is used as the display in the above embodiment, it may be of a type that itself emits light such as a CRT.

[0047]

According to the first aspect of the invention, in the image pickup apparatus, the subject is photographed by the image pickup unit having the optical system and the image pickup device, and the image is reproduced by the attached display unit. Since the display device is used to illuminate the object to be photographed, the display device can be used as an illumination lamp without separately using an illumination means by appropriately setting the display color and the brightness of the display device. Therefore, the cost and weight of the device can be reduced.

According to the second aspect of the present invention, the image pickup section and the display section are connected by the holding means capable of changing the distance between them.
Furthermore, the relative position of the two can be freely changed.

According to the third aspect of the present invention, since the display is provided with a light emitting type or a light emitting element, it is not necessary to separately provide an element or unit for obtaining illumination light, and the display is provided. Can be used as a surface emitting illumination light source.

According to the invention described in claim 4, when the display device is used as an illumination source of the subject, the brightness distribution for determining the brightness distribution of the display device according to the peripheral light amount of the photographing lens of the photographing section. Since I am equipped with correction means,
Even if the peripheral light amount of the photographing lens is reduced, correction can be performed on the light emitting side, so that it is not necessary to use an expensive photographing lens, and the product price can be reduced.

According to a fifth aspect of the present invention, the brightness distribution correcting means causes the entire surface of the display unit of the display section to emit light at a uniform level, and after the image capturing section captures an image, the image capturing section captures the image. By performing the correction so that the image output becomes a uniform level, it is possible to eliminate the influence of the peripheral fall of the photographing lens.

According to the sixth aspect of the present invention, the display section is provided with the color correction means for arbitrarily setting the luminescent color of the display, so that a color filter is attached to the subject for photographing. The same effect as the above can be obtained, and the work can be changed to the user's preference.

According to the seventh aspect of the present invention, the color correction means has a function of displaying the display device with a signal corresponding to a desired coloring level on the photographed image and converting the color temperature of the photographed image. Since it is provided, the color temperature of the captured image can be arbitrarily converted.

According to the eighth aspect of the invention, the color correction means causes the display device to display the same color as the color of the subject if there is a color to be removed from the photographed image. As a result, the specific color on the subject can be prevented from appearing in the captured image, and any color can be removed from the image.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of an embodiment of an image pickup apparatus according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of the image pickup apparatus according to the present invention.

FIG. 3 is a luminance correction intensity distribution chart in the embodiment of FIG.

FIG. 4 is a perspective view showing a third embodiment of the image pickup device according to the present invention.

FIG. 5 is a characteristic diagram showing a spectral reflectance of green.

FIG. 6 is a characteristic diagram showing a spectral reflectance of a document and a spectral reflectance of black ink.

FIG. 7 is a spectral characteristic diagram of illumination light for forming an image in which a green color is removed from a document.

FIG. 8 is a reflectance characteristic diagram of a green portion on a document when illuminating light having a spectral characteristic of green is emitted from a display.

FIG. 9 is a spectral distribution characteristic diagram showing the reflectance of the paper portion.

FIG. 10 is a spectral distribution characteristic diagram of a document portion with respect to illumination light having a green spectral characteristic.

FIG. 11 is a luminance intensity distribution diagram of a display screen showing another example of the luminance correction means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Imaging device 2,11 Photography lens 3 Connecting member 4,9,16 Display part 5,12 Liquid crystal display 6,14 Subject 8 Imaging part 10 Parallel link mechanism 17 Holding part 18a, 18b Leg part

Claims (8)

[Claims] 1. An image pickup apparatus in which a subject is photographed by an image pickup unit equipped with an optical system and an image pickup device and is reproduced by an attached display unit, wherein the display unit of the display unit is used for illuminating a subject to be photographed. An imaging device characterized by. 2. The image pickup apparatus according to claim 1, wherein the image pickup unit and the display unit are connected by a holding unit capable of changing a distance between them. 3. The image pickup apparatus according to claim 1, wherein the display device includes a light emitting type or a light emitting element. 4. An imaging device, wherein an object is imaged by an imaging unit having an optical system and an imaging device, and is reproduced by an attached display unit, when the display is used as an illumination source of the object, the imaging unit. An image pickup apparatus comprising: a luminance distribution correction unit that determines the luminance distribution of the display according to the peripheral light amount of the taking lens. 5. The brightness distribution correction means causes the entire surface of the display of the display section to emit light at a uniform level, and after the image capturing section captures an image, the image output by the image capturing section becomes a uniform level. The image pickup apparatus according to claim 4, wherein the image pickup apparatus is corrected as described above. 6. An image pickup apparatus in which an object is photographed by an image pickup unit having an optical system and an image pickup element and is reproduced by an attached display unit, wherein the display unit arbitrarily sets a luminescent color of the display unit. An image pickup apparatus comprising a color correction unit. 7. The color correction means has a function of displaying the display device with a signal corresponding to a desired coloring level on a captured image and converting the color temperature of the captured image. The imaging device described. 8. The color correction means displays the display device in a color similar to the color of the color existing in the subject that is desired to be removed from the captured image. Imaging device.