JPS61189788A - Video signal recording device for photograph image - Google Patents

Abstract

PURPOSE:To record the photograph video signal to recording media in a state that the density and color of the photograph image are accurately corrected by changing the pattern of an ND filter and a color correcting filter and forming so that the optical density can be a reverse grade for the shifting of the filter. CONSTITUTION:An ND filter 20 is a filter where the optical density changes for the rotating angle, a radial slit-shaped filter film is formed in the radius direction and the passing light quantity is changed in the logarithm curve. A color correcting filter 22 consists of three C, M and Y filters, and the optical density of respective color components is continuously changed for the rotating angle and in such a manner, a wedge-shaped filter film 302 is formed in the scroll shape. The pattern of the filter surface of the ND filter 20 and the color correcting filter 22 is formed so that they can be a reverse grade mutually, the illumination of an aperture 24 is made average, the density of the negative film and the dislocation of the color balance are calculated by the controller, the transmission light of the negative film goes to be the value set beforehand, and in such a manner, the ND filter 20 and color correcting filters C, M and Y 22 are driven.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a video signal recording device for photographic images, and in particular, the present invention relates to a video signal recording device for photographic images, and in particular, a photographic image on an object to be photographed such as a negative film or a reversal film is recorded by using a video camera. The present invention relates to a video signal recording device for photographic images recorded on a recording medium such as a magnetic disk.

[Background of the invention]

Recently, with the spread of video cameras, negative films, prints, and other objects to be photographed can be recorded and stored on magnetic disks for electronic cameras, video tapes, etc., and can be played back on a playback device as needed to be played on TV. The so-called video television alham, which is displayed on a screen and enjoyed, is now being used.

Along with this, similar to the photo printing service, we have started a service in which photographic images such as negative film are captured at a photo processing factory (hereinafter referred to as the lab), recorded on magnetic disks, etc., and the recorded magnetic disks are handed over to customers. It's about to happen.

By the way, for such a video television Alham service, a video signal recording device is required for recording photographic images from a photographic object such as a negative film, a reversal film, or a print onto a magnetic disk or the like. The photographic images to be recorded by such a video signal recording device are as follows:
Many have been recorded in a very wide range of varying concentrations. In particular, in the case of negative films or versatile films shot by amateurs, the density of the film varies over a wide range from film to film or from frame to frame.

Therefore, in order to correct the photographic images recorded on these photographic objects to a state close to natural or close to the intended state, it is necessary to perform density correction and color correction over a wide range and accurately.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is possible to record a video signal representing a photographic image on a recording medium while accurately correcting the density and color of a photographic image whose density varies over a wide range. The purpose of this paper is to propose a video signal recording device for photographic images.

[Summary of the invention]

In order to achieve the above object, the present invention provides an optical system that irradiates an object to be photographed with light from a light source and forms a photographic image recorded on the object on an imaging surface of a photographing means; A group of filters arranged in the optical path of the light source of the system and moved to increase or decrease the filter area and correct the density and color of the light from the light source; and a filter driving means for moving each filter of the group into the optical path. In the video signal recording device for photographic images, the filter group includes N
It consists of a D filter and C (cyan), M (magenta), and Y (yellow) color correction filters, and the ND filter and color correction filter have filter areas that gradually decrease or increase depending on the amount of movement in the optical path. It is characterized in that different filter surface patterns are formed, and these patterns are formed so that the light density has opposite gradients.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a photographic image video signal recording apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the configuration of an optical system in a video signal recording apparatus according to the present invention. In the same figure, the optical system has a light source section IO2 disposed on the front axis 100. A negative film 30 is irradiated with light emitted from the light source 10, and a photographic image recorded on the negative film 3o is transferred to an imaging section. It is composed of an image rotation prism 42 that rotates the image so that it becomes an erect image on the 50 side, an imaging lens 44, a shutter 46, and an imaging section 5o.

In addition, a film detection element detects the shape and position of a notch formed on the edge of the negative film 30 for each frame, indicating the vertical, horizontal, vertical, and vertical directions from which the photographic image recorded on the negative film 30 was taken. 32 is provided on the side of the negative film 3o.

Further, above the negative film 30, with the optical axis 100 in between, blue (B), green (G), and
Negative density detection element 40R140 with a wide dynamic range that detects the density (light amount) of each component of the three primary colors of red (R)
The light source section 10 in which L is disposed is a lamp reflector 12
A halogen lamp 14 surrounded by a halogen lamp 14, a heat protection filter 16 that absorbs infrared rays and transmits only visible light, and a color temperature correction filter (C, M, Y) provided above the heat protection filter 16 for correcting the color temperature of the light source. ) 18, and a negative film correction ND (Neutral Density
) filter 20 and color correction filter (C, M, Y) 22
It consists of a filter group consisting of , and a diffusion box 24 arranged above the filter group.

The ND filter 20 is a filter whose optical density changes depending on the rotation angle, and for example, the glass disk 200 shown in FIG.
A filter is used in which a slit-shaped filter membrane 202 is formed radially in the radial direction of the disc 2000, and the area of the filter membrane 200 gradually decreases or increases in the circumferential direction of the disk 2000. By changing the rotation angle of the ND filter 20, the amount of light passing through it can be changed logarithmically, for example.

Furthermore, the color correction filter 22 consists of three filters, C and MXY, and each of these filters is designed so that the optical density of each color component changes continuously with respect to the rotation angle, for example, as shown in FIG. A draft-shaped filter film 302 is formed in a spiral shape on a glass disk 300, and the filter film 302
The area of the groove changes in the circumferential direction so as to gradually decrease or increase. The patterns on the filter surfaces of the ND filter 20 and the color correction filter 22 are formed to have opposite slopes to each other. Here N
The difference between the filter surface patterns of the D filter 20 and the color correction filter 22 consisting of three C, M, and Y filters is that the ND filter 20 and the color correction filter 22
If the patterns are the same, even if you try to correct the color by rotating the color correction filter 22 and changing the filter area, it will be ND.
This is because each color component is uniformly attenuated by the presence of the filter 20, so that the color correction filter 22 no longer functions.

Furthermore, the optical densities of the filter surfaces of the ND filter 20 and the color correction filter 22 are formed to have opposite slopes at each of the color correction filters 22 at the opening at 24 in FIG. The purpose is to make the illumination of the opening 24 uniform by reversing the concentration gradient of the filter.

Next, a method of manufacturing the ND filter 20 or color correction filter 22 will be explained. As shown in FIG. 4(A), aluminum 402 is first deposited on the surface of a glass substrate 400 at locations corresponding to the transparent portions of the filter, and a multilayer interference film having desired spectral characteristics is deposited on the entire surface.

Next, the aluminum 402 on the glass substrate 400 is etched and etched with an esotynde solution such as a ferric chloride solution to form a pattern 404 on the filter surface as shown in FIG. 4(B), thereby forming a gicroic filter. be done.

The pattern of the filter surface formed on the ND filter 20 or the color correction filter 22 is not limited to those shown in FIGS. 2 and 3, but may be any pattern as long as the optical density changes continuously. For example, a dot-like or halftone-like pattern may be formed so as to gradually become larger (or smaller) so that the optical density changes continuously in the circumferential direction on the disk.

The detection outputs of the notch detection element 32 that detects a notch formed on the edge of the negative film and the negative density detection element 40R140L are taken into a controller to be described later, and are used to drive and control the negative feeding and filters 20 and 22, respectively. . The shutter 46 protects the imaging section 50 from entering into the imaging section 50 at all times.

The imaging unit 50 includes a halogen lamp 14 and a filter 18.2.
The light transmitted through the negative film through the 0.22 mag.
, green (G), and red (R), and image pickup tubes 54, 56, 58, and 54 that image each of these color separated B, G, and R, respectively.
．． It consists of three preamplifiers (not shown) that amplify each output of the 56.58.

Next, FIG. 5 shows a control system of the video signal recording apparatus according to the present invention having the above configuration. In FIG. 5, the video signal recording device includes the above-mentioned optical system, a keyboard 110 for inputting density and color correction data of the negative film 30, various condition setting data, etc. The output j signals of sensor 32.40R140L are taken in, negative feed is performed based on these output signals, and filter 2
A controller 120 that performs 0.22 drive control, etc., and a video signal processing unit that performs color correction and synthesis of video signals (color separation signals) obtained from the imaging unit 50 under the control of the controller 120 to create a video signal. 130 and video signal processing section 1
a recording section 140 that receives the video signal output from 30 and records it on a predetermined track of a magnetic disk using a magnetic head, a monitor television 150, 152, and a power supply section 160 that supplies power to the halogen lamp 14 and each section. , the shutter 46 receives a control signal from the controller 120.
and a prism motor 172 that rotates the image rotation prism 42 by a predetermined angle in response to a control signal from the controller 120.

The controller 120 is a ROM in which fixed data such as reference values indicating the appropriate exposure amount of negative film and programs are stored, and a ROM in which data is temporarily written or read.
A CPU that performs various calculations such as calculating the average density of the negative film 30 based on programs stored in the AM and ROM.
and an I10 interface.

The video signal processing unit 130 also includes an image pickup tube 54 in the image pickup unit 50.
．． 56. A γ correction circuit that performs color correction of the preamplifier output of each color component of B, G, and R that amplified each video signal of 58, and each video signal of B, G, and R that has undergone color correction by the γ correction circuit. It consists of a color encoder section and other parts that combine the images into a composite video signal.

The monitor television 150 is for checking the photographic image on the screen when recording a video signal indicating the photographic image recorded on the negative film 30 on the magnetic disk.
The monitor television 152 also has a magnetic disk recording unit 140 on which a video signal representing a photographic image of a negative film has already been recorded.
This is for checking the photographic image when it is reproduced by the reproduction section provided inside.

In the above configuration, first, negative feed and image direction are designated by key operations on the keyboard 110. Further, a detection signal indicating the density of each color component of RlG and B is inputted from the negative density detection element 40R140L.

The controller 120 stores photographic images as royal images on a magnetic disk in the recording section 140 or on the monitor television 1.
A control signal for rotating the image rotating prism at a predetermined angle as recorded or displayed at 50 is output to the prism motor 172. - Furthermore, the controller 120 includes a negative density detection element 40R14.
0L detection output is taken in, the density and color balance deviation of the negative film is calculated from these detection outputs, and N is adjusted so that the transmitted light of the negative film becomes a preset value.
Control signals for driving the D filter 20 and color correction filters (C, M, Y) 22 are output to the filter motor 26.

Next, when the operator instructs to open the shutter 46 by operating a key on the keyboard 110, a drive signal is output from the controller 120 to the drive amplifier 170, and the shutter 46 is opened.
6 is released.

As a result, the images of the frames on the negative film 30 are displayed on the monitor television 150. While checking the image on the monitor TV 150, the operator uses the keyboard 110 if it is necessary to further correct the density and color of the negative film.
The correction data is input to the controller 120 by. The controller 120 corrects the reference value indicating the appropriate exposure amount using this correction data, and outputs a control signal to the filter motor 26 to correct and control the rotation angle of the filters 20 and 22 using the corrected value as a new reference value. .

Next, when the keyboard 110 instructs to start recording, the controller 120 outputs a start signal to the recording section 140, and the recording section 140 records a video signal indicating a photographic image of a predetermined frame of the negative film 30 on a predetermined track of the magnetic disk. do.

By repeating the above operations, video signals representing photographic images of each frame of the negative film 30 are sequentially recorded on the magnetic disk.

〔Effect of the invention〕

According to the present invention, the patterns of the ND filter and the color correction filter are changed, and the light density is formed to have an inverse gradient with respect to the movement of the filter, so that photographic images with widely varying density can be corrected. A video signal representing the photographic image can be recorded on a recording medium with its density and color accurately corrected.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical system in an embodiment of a photographic image recording apparatus according to the present invention, FIG. 2 is a plan view showing the structure of an ND filter, and FIG. 3 is a plan view showing the structure of a color correction filter. , FIG. 4 is an explanatory diagram showing a method of manufacturing an ND filter or a color correction filter, and FIG. 5 is a block diagram of a control system of a video signal recording apparatus for photographic images according to the present invention. 10... Light source section, 18... Color density correction filter,
20... ND filter, 22... Color correction filter, 26... Filter motor, 30... Shooting object, 32... Film detection element, 40R1
40L...Concentration detection element, 50...Imaging section, 11
0...keyboard, 120...controller,
130... Video signal processing section, 140... Recording section, 150.152... Monitor television.

Claims (1)

[Scope of Claims] An optical system that irradiates a photographic object with light from a light source and forms a photographic image recorded on the photographic object on an imaging surface of an imaging means; The filter includes a filter group that increases or decreases the filter area by being arranged and moves to correct the density and color of the light from the light source, and a filter driving means that moves each filter of the filter group into the optical path. In the video signal recording device for photographic images, the filter group includes an ND filter, C (cyan), M
(magenta) and Y (yellow) color correction filters, and the ND filter and color correction filter are formed with different filter surface patterns such that the filter area gradually decreases or gradually increases depending on the amount of movement in the optical path. and,
A video signal recording device for photographic images, characterized in that these patterns are formed so that the light density has a reverse gradient.