JPH10145595A - Method for deciding gradation adjusting quantity in image pickup unit and image pickup unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable deciding gradation adjusting quantity in order to obtain a black and white image where gradation of excellently reproduced by correcting difference between respective photometric characteristics from a density obtained from the image pickup signal of an image pickup part in an image pickup unit and the density photometriocally measured by a density meter and executing gradation adjustment corresponding to a film. SOLUTION: A CPU 26 executing control for deciding the gradation adjusting quantity of the image pickup unit controls respective control parts based on information which is stored in ROM 27 and gradation adjusting quantity which is stored in a parameter storing non-volatile memory 29. For example, the CPU 26 permits a gradation converting quantity setting part 30 to read gradation converting quantity corresponding to the kinds of a developing silver image film picked-up an image from the parameter storing non-voltage memory 29 and transmits a grain adjusting lever corresponding to gradation converting quantity of a gradation converter 13 so that the again adjustment of the gradation converter 13, that is, gradation adjustment is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup means for picking up a black-and-white image recorded on a black-and-white film with transmitted light and obtaining an image pickup signal, and a gradation for adjusting a gradation of the image pickup signal obtained by the image pickup means. The present invention relates to a method of determining a gradation adjustment amount of an image pickup apparatus that obtains a black-and-white image signal that reproduces the black-and-white image gradation-adjusted by the gradation adjuster, and an image pickup apparatus.

[0002]

2. Description of the Related Art Conventionally, in an image pickup apparatus for picking up a developed silver image film such as a developed X-ray film, a monochrome image recorded on the developed silver image film is picked up by transmitted light to obtain an image pickup signal. Means, and a tone adjusting means for adjusting the tone of the image signal obtained by the image sensing means, and obtaining a black and white image signal for reproducing the black and white image tone adjusted by the tone adjusting means. Is known. This corrects characteristics depending on the device configuration of the imaging means, the imaging element, the imaging light source, and the like.

[0003]

In order to determine the gradation adjustment amount of the gradation adjustment, a developed silver image film on which an image whose density has been measured by a densitometer is recorded is transmitted through an imaging unit. , An imaging signal was obtained, and a gradation adjustment amount was determined from the correspondence between the obtained imaging signal and the known density.

[0004] However, there have been cases where a black-and-white image signal whose tone is well reproduced cannot be obtained. Investigation of the cause reveals that, surprisingly, when the type of the developed silver image film for determining the gradation adjustment amount and the type of the developed silver image film to be imaged by the imaging device are different, a black-and-white image signal whose gradation is well reproduced is obtained. It turns out that things that don't get happen.

An object of the present invention is to provide a method for determining a gradation adjustment amount for obtaining a black and white image signal in which a gradation is well reproduced.

[0006] Conventionally, it has been considered that a black-and-white film (especially a developed silver image film) does not require a change in the gradation adjustment amount for each type of film such as a color film. Because, color film, depending on the type of film,
Due to different spectral transmittance due to different coloring pigments, etc.,
It is necessary to change the gradation adjustment amount. However, since the spectral transmittance of a black-and-white film (particularly, a developed silver image film) has a constant characteristic in a wavelength region used for normal imaging, the gradation adjustment amount for each film type is required. Was considered unnecessary.

However, when the type of the black-and-white film for determining the gradation adjustment amount and the type of the black-and-white film to be imaged by the image pickup device are different, the cause of the failure to obtain a black-and-white image signal in which the gradation is well reproduced is investigated. It has been found that the amount of gradation adjustment must be changed because the diffusivity of light differs depending on the type of.

For example, FIG. 1 shows a correspondence between a density DD obtained without adjusting the gradation from an image pickup signal of an image pickup means of a certain image pickup apparatus and a density SD measured by a densitometer. It can be seen that the correspondence differs depending on the type. That is, for film A, SD ≒ 1.38 × DD
In film B, SD ≒ 1.25 × D
D, but in film C, SD ≒ 1.20 ×
DD and so on.

Another object of the present invention is to provide an image pickup apparatus capable of obtaining a black and white image signal in which a gradation is well reproduced by changing a gradation adjustment amount according to a type of a black and white film. .

[0010]

The object of the present invention is achieved by the following claims. Hereinafter, each claim will be described. In addition, the description which overlaps with the cited item will be omitted.

[Explanation of claim 1] [Imaging means for imaging a black and white image recorded on a black and white film with transmitted light to obtain an imaging signal, and a gradation for adjusting a gradation of the imaging signal obtained by the imaging means] Adjusting means for obtaining a black-and-white image signal that reproduces the black-and-white image whose tone has been adjusted by the tone adjusting means. A monochrome image recorded on the monochrome image is captured by the imaging means using transmitted light, an image signal is obtained, and the obtained image signal and the monochrome image recorded on the gradation adjustment amount determination black-and-white film are transmitted through a densitometer. When determining the gradation adjustment amount from the correspondence with the density information obtained by the measurement, the image pickup unit and the density of the black and white film for determining the gradation adjustment amount and the black and white film of the type to be imaged by the imaging device Of photometric characteristics Method of determining the gradation adjustment amount of the imaging device and corrects the different. By using the gradation adjustment amount determined by the above), when determining the gradation adjustment amount, the imaging unit of the black and white film of the type to be imaged by the imaging device and the black and white film for gradation adjustment amount determination, Since the difference in the photometric characteristics of the densitometer is corrected, a black-and-white image signal whose tone is well reproduced can be obtained.

For example, referring to FIG. 1, when a film A is used as a black-and-white film for determining a gradation adjustment amount, if the gradation adjustment amount is determined as it is, a gradation is obtained from an image pickup signal of an image pickup means of the image pickup apparatus. The correspondence between the density DD obtained without adjustment and the density SD measured by the densitometer is SD
The gradation adjustment amount is determined as having a relationship of 1.38 × DD, and when the type of the black-and-white film imaged by this imaging device is film B, a black-and-white image signal in which gradation is well reproduced Is not obtained, and a black and white image signal which is more intense than originally obtained is obtained. Therefore, as shown in FIG.
Photometric characteristics of the imaging unit and the densitometer as indicated by the relationship between DD and SD of film A, and photometric characteristics of the imaging unit and the densitometer as indicated by the relationship between DD and SD of film B By correcting the difference from the above, it is possible to obtain a gradation adjustment amount capable of obtaining a black-and-white image signal in which gradation is well reproduced.

[Explanation of claim 2] [The gradation of the image pickup apparatus according to claim 1, wherein the effective light receiving range of the image pickup means and the effective light receiving range of the photometry of the densitometer are different. How to determine the amount of adjustment. When the effective light receiving range of the imaging by the imaging means is different from the effective light receiving range of the photometry of the densitometer, light is transmitted between the black and white film for determining the gradation adjustment amount and the black and white film of the type imaged by the imaging device. Diffusibility is different.

However, by using the gradation adjustment amount determined by the present invention, when determining the gradation adjustment amount, the gradation adjustment amount determining black-and-white film and the type of image picked up by the imaging device are used. Since the difference between the photometric characteristics of the image pickup unit and the densitometer of the black and white film is corrected, it is possible to obtain a black and white image signal whose tone is well reproduced.

[Explanation of claim 3] "The method of determining a gradation adjustment amount of an image pickup apparatus according to claim 1 or 2, wherein the black and white film is a developed silver image film. In particular, the spectral transmittance of the developed silver image film has a constant characteristic in the wavelength region used for normal imaging, and therefore, unlike color films, the amount of gradation adjustment due to the difference in spectral transmittance due to the type of film. Was thought to be unnecessary, but it was unexpectedly found that the amount of gradation adjustment had to be changed because the diffusivity of light was different depending on the type of developed silver image film. .

However, by using the gradation adjustment amount determined according to the present invention, when determining the gradation adjustment amount, the type of the black-and-white film for determining the gradation adjustment amount and the type of image picked up by the imaging device are used. Since the difference between the photometric characteristics of the image pickup unit and the densitometer of the black and white film is corrected, it is possible to obtain a black and white image signal whose tone is well reproduced.

[Explanation of claim 4] "Imaging means for taking an image of a black and white image recorded on a black and white film with transmitted light to obtain an image signal, and a gradation for adjusting a gradation of the image signal obtained by the image means" Adjusting means, and an imaging apparatus that obtains a black-and-white image signal that reproduces the black-and-white image whose tone has been adjusted by the tone adjusting means. An image is picked up by an imager using transmitted light, an image signal is obtained, and a density obtained by measuring the obtained image signal and a black-and-white image recorded on a gradation adjustment amount determining black-and-white film with a densitometer using transmitted light. From correspondence with information,
Using the gradation adjustment amount obtained by correcting the difference in the photometric characteristics between the image pickup unit and the densitometer between the gradation adjustment amount determination black-and-white film and the type of black-and-white film to be imaged by the imaging device, An image pickup apparatus, wherein the tone adjustment means adjusts the gradation of the image signal obtained by the image pickup means. When the gradation adjustment amount is determined, the difference between the photometric characteristics of the image pickup unit and the densitometer between the black-and-white film for determining the gradation adjustment amount and the black-and-white film of the type imaged by the imaging device is corrected. Thus, a black-and-white image signal whose tone is well reproduced can be obtained.

[Explanation of claim 5] The image pickup apparatus according to claim 4, wherein the effective light receiving range of the imaging by the image pickup unit is different from the effective light receiving range of the photometry of the densitometer. . When the gradation adjustment amount is determined, the difference between the photometric characteristics of the image pickup unit and the densitometer between the black-and-white film for determining the gradation adjustment amount and the black-and-white film of the type imaged by the imaging device is corrected. Thus, a black-and-white image signal whose tone is well reproduced can be obtained.

[Explanation of claim 6] "The image pickup apparatus according to claim 4 or 5, wherein the black and white film picks up an image of a developed silver image film. When the gradation adjustment amount is determined, the difference between the photometric characteristics of the image pickup unit and the densitometer between the black-and-white film for determining the gradation adjustment amount and the black-and-white film of the type imaged by the imaging device is corrected. Thus, a black-and-white image signal whose tone is well reproduced can be obtained.

[Explanation of claim 7] "Imaging means for imaging a black and white image recorded on a black and white film with transmitted light to obtain an imaging signal, and gradation for adjusting the imaging signal obtained by the imaging means." Adjusting means, and an image pickup apparatus that obtains a black-and-white image signal that reproduces the black-and-white image whose tone has been adjusted by the tone adjusting means. An image pickup apparatus for performing gradation adjustment with a gradation adjustment amount according to a type. ], The gradation is adjusted by the gradation adjustment amount according to the type of the black and white film picked up by the transmitted light by the image pickup means, so that it is possible to obtain a black and white image signal in which the gradation is well reproduced.

As an example, referring to FIG. 1, if a film A is used as a black-and-white film for determining a gradation adjustment amount, if the gradation adjustment amount is determined as it is, the gradation signal is obtained from the image pickup signal of the image pickup means of the image pickup apparatus. The correspondence between the density DD obtained without adjustment and the density SD measured by the densitometer is SD
Since the gradation adjustment amount is determined as having a relationship of 1.38 × DD, the type of the black-and-white film picked up by the image pickup device may be only the film A. If C is also an image, a black-and-white image signal in which gradation is well reproduced cannot be obtained, and a black-and-white image signal which is harder than originally obtained will be obtained. Therefore, by performing gradation adjustment with a gradation adjustment amount corresponding to the type of the black-and-white film imaged by the imaging means, it is possible to obtain a black-and-white image signal whose gradation is well reproduced.

[Explanation of Claim 8] "Information for directly or indirectly specifying a gradation adjustment amount according to the type of a black-and-white film imaged by the imaging means is input from the imaging signal obtained by the imaging means." Having input means, the gradation adjusting means based on information input by the input means,
The image pickup apparatus according to claim 7, wherein the image pickup signal obtained by the image pickup means is subjected to gradation adjustment by a gradation adjustment amount corresponding to a type of a black and white film picked up by the image pickup means. ], Information that directly or indirectly specifies the gradation adjustment amount corresponding to the type of the black-and-white film obtained by imaging the imaging signal obtained by the imaging means is input, and based on the input information, Since the gradation is adjusted by the gradation adjustment amount according to the type of the black and white film imaged by the image pickup means, a black and white image signal in which the gradation is well reproduced can be obtained.

[Explanation of claim 9] "The image pickup apparatus according to claim 7 or 8, wherein the black and white film picks up an image of a developed silver image film. ], The gradation is adjusted with the gradation adjustment amount corresponding to the type of the black-and-white film picked up by the image pickup means, so that it is possible to obtain a black-and-white image signal in which the gradation is well reproduced.

[Explanation of Terms] A black-and-white film is a film on which a black-and-white image is recorded. Not only a developed silver-image film on which a black-and-white image is recorded with developed silver, but also a film on which a black-and-white image is recorded with a pigment such as carbon black. And a film in which a black and white image is recorded with a black organic dye.
Among these, in particular, the spectral transmittance of a developed silver image film or a film in which a black-and-white image is recorded by carbon black has a constant characteristic in a wavelength region used for normal imaging.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific examples of the present invention will be described as embodiments, but the present invention is not limited thereto. Further, in the embodiments, although there are definite expressions for terms and the like, they show preferred examples of the present invention, and do not limit the meaning or technical scope of the terms of the present invention.

Embodiment FIG. 2 shows a schematic configuration of an image pickup section of an image pickup apparatus according to this embodiment. FIG. 3 is a schematic configuration diagram of the imaging device of the present embodiment. FIG. 4 is a schematic cross-sectional view of the imaging device of the present embodiment. Hereinafter, the imaging apparatus according to the present embodiment will be described with reference to these drawings.

The laser emitting section 1 is a semiconductor laser,
It emits laser light. The laser light emitted by the laser emitting unit 1 enters the collimator lens 2. The collimator lens 2 adjusts the incident laser light into parallel light, and the laser light adjusted as a parallel light beam enters the beam shaping optical system 3.

The beam shaping optical system 3 shapes the incident laser light, and the shaped laser light is reflected by the mirror 4 and is incident on the polygon mirror 5 rotating at a constant rotation speed. The polygon mirror 5 reflects the incident laser light as laser light that scans at a constant angular velocity. The reflected laser light is f
is incident on the θ lens 6, and the fθ lens 6 converts the laser light into a laser light that scans at a constant speed on the surface of the film F. fθ
The laser beam that has exited the lens 6 is reflected by the mirror 7 and scans the film F at a constant speed.

Then, a part of the laser light transmitted through the film F enters the light collector 10. The concentrator 10 has one end of many optical fibers arranged in a line around a scanning line of the film F, and the other end of many optical fibers arranged on a light receiving surface of a photomultiplier 11. Then, the light incident on the condenser 10 enters the light receiving surface of the photomultiplier 11, and the photomultiplier 11 is a photoelectric converter, and generates a current proportional to the amount of received light.

As shown in FIG. 3, the current generated by the photomultiplier 11 is converted into a voltage that is logarithmically converted by the logarithmic converter 12, and the image signal voltage that is converted by the logarithmic converter 12 is converted into a gradation signal. The signal is converted into a signal voltage whose gradation has been adjusted by the device 13. The tone converter 13 is a low-pass filter that removes high-frequency components of the logarithmically converted imaging signal voltage, a multiplier that adjusts the gain of the imaging signal voltage from which high-frequency components have been removed by the low-pass filter, and a gain that is adjusted by the multiplier. And an adder for adjusting the offset of the imaging signal voltage.
It is based on a signal corresponding to the gradation conversion amount from 0.

The signal voltage whose gradation has been adjusted by the gradation converter 13 is converted into a digital signal whose gradation has been adjusted by the A / D converter 14. The A / D converter 14 includes a sample and hold circuit and an A / D conversion element, and converts a voltage sampled and held by the sample and hold circuit into a digital signal. The digital signal from the A / D converter 14 is stored in one of the first line memory 16 and the second line memory 17 by the switch 15 for each main scan. The data stored in these line memories is sent to the shading correction unit 22 by the switch 18 for communicating a line memory different from the line memory communicated by the switch 15. The shading correction unit 22 performs shading correction by adding the shading data stored in the shading memory 21. The data subjected to the shading correction is sent to an external host computer through the I / F 23 and is sent to the RAM 28 at the same time. The RAM 28 stores 1 according to the instruction of the CPU 26.
Data is stored for each screen.

The head laser light exiting the fθ lens 6 enters the optical sensor 8. When laser light is incident on the optical sensor 8, a signal from the optical sensor 8 enters the clock generator 19, and the clock generation timing is initialized. Then, the clock from the clock generator 19 enters the address generation timing control unit 20, and the switching unit 15 and the switching unit 18
And the rewriting and reading of the memories of the first line memory 16 and the second line memory 17 are controlled.
The A / D converter 14 also receives a clock from the clock generator 19, and controls the timing of sample and hold.

The CPU 26 controls each control unit based on information stored in the ROM 27 and parameters such as a gradation adjustment amount stored in the parameter storage nonvolatile memory 29. For example, the CPU 26 stores the gradation conversion amount according to the type of the developed silver image film in the parameter storage nonvolatile memory 29 in the gradation conversion amount setting unit 30.
, And a gain adjustment level corresponding to the amount of gradation conversion is sent to the gradation converter 13, whereby the gain of the gradation converter 13, that is, the gradation adjustment is performed.

As a modification of the above circuit configuration,
Instead of the gradation converter 13, a low-pass filter having only a function as a low-pass filter excluding a high-frequency component of the logarithmically converted image signal voltage is provided, and the A / D converter 14 is provided.
An LUT conversion unit is provided between the LUT conversion unit and the switching unit 15 so that the gradation conversion amount setting unit 30 can rewrite the contents of the LUT of the LUT conversion unit. Is directly input to the A / D converter 14, and the digital signal obtained by the A / D converter 14 is
The T conversion unit may perform gradation conversion by LUT conversion of the content corresponding to the gradation conversion amount from the gradation conversion amount setting unit 30, and input the gradation conversion amount to the switch 15. In this case, CP
U26 causes the gradation conversion amount setting unit 30 to read out from the parameter storage nonvolatile memory 29 the LUT data corresponding to the gradation conversion amount corresponding to the type of the developed silver image film being picked up, and perform the gradation conversion. It is preferable that the LUT data having the content corresponding to the amount is sent to the LUT conversion unit and the gradation adjustment of the LUT conversion unit is performed.

Further, the CPU 26 executes a gradation corresponding to the type of the developed silver image film on the basis of information on the type of the developed silver image film from the host computer and an input signal from an input unit (not shown) provided in the imaging device. The conversion amount is read from the parameter storage nonvolatile memory 29.

The cross section of the imaging device having such a schematic configuration is as follows.
As shown in FIG. 4, a setting section 52 for setting the developed silver image film, a transport section 53 for transporting the developed silver image film set in the set section 52, and a developing section transported in the sub-scanning direction by the transport section 53. A scanning optical device 51 that scans the silver image film on a line at a predetermined position, a light receiving device 54 that receives light transmitted through the developed silver image film F scanned by the scanning optical device 51, and a light receiving device that receives the light. A signal processing unit 56 for performing processing such as gradation adjustment of an image pickup signal, and a stacker 57 for accommodating the scanned developed silver image film F
And

The scanning optical device 51 includes a laser light emitting section 1.
To the mirror 7 are accommodated, and the light receiving device 54
Accommodates devices from the condenser 10 to the logarithmic converter 12, and the signal processing unit 56 accommodates devices such as the tone adjusters 13 to.

Next, a method of determining the gradation adjustment amount of the imaging device will be described. First, a developed silver image film (hereinafter, referred to as a step tablet) 80 in which a developed silver image of a black and white step tablet image as shown in FIG. Create by the method of. The step tablet 80 has a density 1 region 81 with a transmission density of about 1.0, a density 2 area 82 with a transmission density of about 2.0, and a transmission density of about 3.0. And a density 4 region 84 where the transmission density of the densitometer is about 4.0. Then, the density of each step of the step tablet 80 is measured by a densitometer using transmitted light. Next, the step tablet 80 is imaged with transmitted light using the imaging device of the present embodiment in which the offset adjustment amount and the gain adjustment amount of the gradation converter 13 have not been determined yet, and the imaging signal of each step (the present invention). (Corresponding to the density of the imaging means). At this time, FIG.
Approximately 2 mm, which is 1 cm or more from all ends of the concentration 1 region 81 and is completely surrounded by the concentration 1 region 81 as shown in FIG.
In the four areas 91, the output values of the imaging signals are averaged to obtain an imaging signal of the density 1 area 81, and similarly, the density 2 area 82,
1 cm from all ends of the concentration 3 region 83 and the concentration 4 region 84
The area 9 of about 2 mm square completely surrounded by the density 2 area 82, the density 3 area 83, and the density 4 area 84
At 2, 93 and 94, the output value of the imaging signal is averaged to obtain a density of 2
It is assumed that image signals of the area 82, the density 3 area 83, and the density 4 area 84 are provided. Then, based on the relationship between the imaging signals of the density 1 region 81, the density 2 region 82, the density 3 region 83, and the density 4 region 84 and the density of the densitometer, the linear expression indicating the relationship between the imaging signal and the density of the densitometer is minimized. Determined by the square method. Then, from a linear expression indicating the relationship between the obtained imaging signal and the density of the densitometer,
The offset adjustment amount and the gain adjustment amount are determined. In addition,
This gain adjustment amount is the gradation adjustment amount of the film A.

Next, the gradation adjustment amount of another type of film is obtained. As for other types of films, a film having a certain density is prepared, and the density of the film is measured with a densitometer.
Then, the imaging device of the present embodiment in which the offset adjustment amount and the gain adjustment amount of the gradation converter 13 are set with reference to the film A is used for imaging with transmitted light to obtain an imaging signal. Then, the gain adjustment amount obtained by correcting the difference from the imaging signal obtained by the film A is defined as the gradation correction amount.

By storing the offset adjustment amount obtained by the above-described method of determining the gradation adjustment amount of the image pickup device and the gain adjustment amount for each type of film in the parameter storage nonvolatile memory 29, In the imaging device of the present embodiment, the gradation adjustment amount obtained by the above-described method of determining the gradation adjustment amount of the imaging device can be used.

In the modification using the LUT, LUT data of the type of the developed silver image film is created from the offset adjustment amount and the gain adjustment amount for each type of the film. Then, by storing the LUT data having the content corresponding to the gradation conversion amount corresponding to the type of the developed silver image film in the parameter storage nonvolatile memory 29, the LUT data is obtained by the above-described method of determining the gradation adjustment amount of the imaging apparatus. The obtained gradation adjustment amount can be used.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a difference between a density by an imaging unit and a density by a densitometer due to a difference in film type;

FIG. 2 is a schematic configuration diagram of an imaging apparatus according to the embodiment.

FIG. 3 is a schematic configuration diagram of an imaging apparatus according to the embodiment.

FIG. 4 is a schematic cross-sectional view of the imaging apparatus according to the embodiment.

FIG. 5 is a view showing a step doublet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser emission part 2 Collimator lens 3 Beam shaping optical system 4 Mirror 5 Polygon mirror 6 fθ lens 7 Mirror 8 Optical sensor 9 Carrier motor 10 Condenser 11 Photomultiplier 12 Logarithmic converter 13 Gradation converter 14 A / D conversion Unit 15 Switch 16 First line memory 17 Second line memory 18 Switch 19 Clock generator 22 Shading correction unit

Claims (9)

[Claims] An image pickup means for picking up a black and white image recorded on a black and white film with transmitted light to obtain an image pickup signal, and a gradation adjusting means for adjusting a gradation of the image pickup signal obtained by the image pickup means. In the method for determining a gradation adjustment amount of an imaging device for obtaining a black and white image signal for reproducing the black and white image whose gradation has been adjusted by the gradation adjustment means, the black and white image recorded on the black and white film for gradation adjustment amount determination Is imaged with transmitted light by the imaging means, an image signal is obtained, and the obtained image signal and a black-and-white image recorded on a black-and-white film for gradation adjustment amount determination are measured by transmitted light with a densitometer. When the gradation adjustment amount is determined from the correspondence with the density information, the difference in the photometric characteristics of the imaging unit and the densitometer between the black-and-white film for determining the gradation adjustment amount and the black-and-white film of the type that is imaged by the imaging device. To correct A method for determining a gradation adjustment amount of an imaging device, which is a feature of the present invention. 2. An effective light receiving degree range for imaging by the imaging means,
2. The method according to claim 1, wherein the effective light receiving ranges of the photometry of the densitometer are different. 3. The method according to claim 1, wherein the black and white film is a developed silver image film. 4. An image pickup means for picking up a black and white image recorded on a black and white film with transmitted light to obtain an image pickup signal, and a gradation adjusting means for adjusting a gradation of the image pickup signal obtained by the image pickup means. Then, in an imaging apparatus for obtaining a black-and-white image signal for reproducing the black-and-white image gradation-adjusted by the gradation adjustment means, a black-and-white image recorded on a gradation adjustment amount determination black-and-white film is transmitted by the imaging means with transmitted light. Imaging, obtaining an imaging signal, from the correspondence between the obtained imaging signal and the density information obtained by measuring the transmitted and received black and white image recorded on the black and white film for gradation adjustment amount determination with a densitometer, Using the gradation adjustment amount obtained by correcting the difference in the photometric characteristics between the image pickup unit and the densitometer between the gradation adjustment amount determination black-and-white film and the type of black-and-white film to be imaged by the imaging device, Key adjustment means An image pickup apparatus, wherein a gradation of an image pickup signal obtained by an image means is adjusted. 5. The imaging apparatus according to claim 4, wherein an effective light receiving range of the imaging unit by the imaging unit is different from an effective light receiving range of the photometry by the densitometer. 6. The image pickup apparatus according to claim 4, wherein the black and white film picks up an image of a developed silver image film. 7. An image pickup means for picking up a black and white image recorded on a black and white film with transmitted light to obtain an image pickup signal, and a gradation adjusting means for adjusting a gradation of the image pickup signal obtained by the image pickup means. An image pickup apparatus for obtaining a black-and-white image signal for reproducing the black-and-white image gradation-adjusted by the gradation adjustment means, wherein the gradation adjustment means has a gradation corresponding to a type of the black-and-white film imaged by the imaging means. An image pickup apparatus for performing gradation adjustment by an adjustment amount. 8. An input means for inputting information for directly or indirectly specifying a gradation adjustment amount corresponding to a type of a black-and-white film imaged by the imaging means, the imaging signal obtained by the imaging means, The tone adjusting means adjusts a tone of an image signal obtained by the image sensing means based on information input by the input means with a tone adjustment amount corresponding to a type of a black-and-white film imaged by the image sensing means. The imaging device according to claim 7, wherein: 9. The imaging device according to claim 7, wherein the monochrome image is an image of a developed silver image film.