JPH09251528A - Film image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily cancel the flaw of a film in image data. SOLUTION: A film 9 is inserted between a light source device 1 and a light receiving device 6 having an image pickup lens 7 and a photoelectric converting element 8 and the image of the film 9 is read in a film image reading device. In the device, light being made incident from the light source device 1 to the image pickup lens 7 is made to be weaker than the one which is not made incident to the image pickup lens 7 unless the film 9 is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film image reading apparatus for reading a film image.

[0002]

2. Description of the Related Art As a conventional film image reading apparatus for reading an image on a film, there has been proposed one as shown in FIGS.

In FIGS. 5 and 6, reference numeral 1 denotes a light source device, and the light source device 1 is a light source 2 including a halogen lamp or the like.
A condenser lens 3 for directing the light flux from the light source 2 inward, and an infrared cut filter 4 for cutting infrared rays.
And the diffusion plate 5. Reference numeral 6 denotes a light receiving device. The light receiving device 6 includes an imaging lens 7 arranged along the optical axis of the light source device 1 and a CCD line which is a photoelectric conversion element on which imaging light from the imaging lens 7 is incident. It is composed of a sensor 8.

In this case, the optical axis light a from the light source device 1 is made to enter the image pickup lens 7.

In such a film image reading apparatus, the film 9 is transferred between the light source device 1 and the light receiving device 6 at a predetermined speed, and the light transmitted from the light source device 1 through the film 9 is taken by the image pickup lens 7. The image data is supplied from the CCD line sensor 8 to the CCD line sensor 8, and the obtained image data is recorded on, for example, a recording medium.

[0006]

In the film image reading apparatus as shown in FIGS. 5 and 6, when the film 9 has a flaw 9a, as shown in FIG. The light a that hits the scratch 9a is the scratch 9a.
Scattered by, this image data by the light b travels straight not exposed to this flaw 9a that only imaging light amount of the portion corresponding to the flaw 9a of the film 9 is reduced with only light a ₀ in this part goes straight There was an inconvenience that only the portion of the scratch 9a appeared dark.

In a conventional film image reading apparatus as shown in FIGS. 5 and 6, the film 9 has a flaw 9a.
The diffusing plate 5 is used to make dust and dirt inconspicuous. However, when the light diffusion rate of the diffuser plate 5 is increased, the scratch 9a of the film 9 becomes inconspicuous in the image data, but the efficiency of the light incident from the light source device 1 to the image pickup lens 7 of the light receiving device 6 is low, and the light amount is small. There is an inconvenience of becoming insufficient, and the diffusion rate of light of the diffusion plate 5 is increased to, for example, 10
Even with 0%, the flaw 9a of the film 9 could not be completely erased from the image data.

The present invention has been made in view of the above problems, and an object thereof is to make it possible to satisfactorily eliminate the scratches of the film in the image data.

[0009]

According to the film image reading apparatus of the present invention, a film is inserted between a light source device and a light receiving device having an imaging lens and a photoelectric conversion element to read an image on the film. In the film image reading device, the light which is incident on the image pickup lens from the light source device when the film is not inserted is weaker than the light which is not incident on the image pickup lens.

According to the present invention, when the film is not scratched, the image of the film is read by the light incident on the imaging lens when the film is not inserted, and when the film is not inserted in the scratched portion of the film. Since the scattered light of the light that enters the imaging lens and the relatively strong scattered light of the light that does not enter the imaging lens are added and enter the imaging lens, the light amount does not decrease at the scratched portion of the film, and the image The data will not show any scratches on this film.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the film image reading apparatus of the present invention will be described below with reference to FIGS. 1 and 2, parts corresponding to those in FIGS. 5, 6 and 7 are designated by the same reference numerals.

The light source device 1 in the example of FIG. 1 includes a light source 2 including a halogen lamp, a condenser lens 3 for directing a light beam from the light source 2 inward, an infrared cut filter 4 for cutting infrared rays, and a diffuser plate 5. It consists of. This diffuser plate 5
Is a transparent glass that has been subjected to a frost treatment by sandblasting so as to have a diffusion effect, and has an elliptical directivity.

The light receiving device 6 is composed of an image pickup lens 7 and a CCD line sensor 8 which is a photoelectric conversion element on which the image pickup light from the image pickup lens 7 is incident.

In this embodiment, as shown in FIG. 1A, the optical axis 1a of the light source device 1 is arranged so as to be inclined by an angle θ with respect to the optical axis 6a of the light receiving device 6 when viewed from above. The angle θ is set so that the light 5b in the optical axis direction of the light source device 1 does not enter the imaging lens 7, and the diffused light 5a from the diffusion plate 5 enters the imaging lens 7.

In this case, as shown in FIG. 1B, the diffusing plate 5 has an elliptical directivity, so that the light source device 1 is not inserted between the light source device 1 and the light receiving device 6 when the film 9 is not inserted.
Further, the light that is incident on the image pickup lens 7, that is, the diffused light 5a from the diffusion plate 5 is weaker than the light that is not incident on the image pickup lens 7, that is, the diffused light (5b) in the optical axis direction.

As shown in FIG. 1A, the light source device 1
The film 9 can be transferred at a predetermined speed so that the film 9 is orthogonal to the optical axis 6a of the light receiving device 6 between the light receiving device 6 and the light receiving device 6.
Otherwise, the configuration is the same as the conventional one.

Since the film image reading apparatus according to the present embodiment is constructed as described above, when the film 9 has no scratches 9a, the diffused light 5a from the diffuser plate 5 of the light source device 1 is imaged through the film 9. It is supplied to the CCD line sensor 8 via the lens 7, and image data is obtained from this CCD line sensor 8.

In this case, since the image data is obtained by the diffused light 5a, the graininess of the film 9 is less likely to occur, and the S / N ratio is reduced.
Image data of good quality can be obtained.

As shown in FIG. 2, in the portion of the film 9 having the scratch 9a, the diffused light 5a from the diffuser plate 5 of the light source device 1 is obtained.
Light 5 in the direction of the imaging lens 7 of scattered light due to the scratches 9a
a ₀ and diffused light 5 from the diffuser plate 5 of the light source device 1 in the optical axis direction
The light 5a ₀ + 5b _{0 obtained} by adding the light 5b _{0 in the} direction of the image pickup lens 7 of the light scattered by the scratch 9a of the image pickup lens 7b
The light amount reduced by the scratch 9a of the diffused light 5a can be compensated for by the light 5b ₀ of the scattered light 5b of the diffused light 5b in the optical axis direction due to the scratch 9a of the diffused light 5a toward the imaging lens 7. As a result, only the portion of the flaw 9a does not become dark, and the same image data as in the state without the flaw 9a can be obtained.

In this case, since the diffusivity of the diffuser plate 5 may be relatively small, the efficiency of the light source 2 of the light source device 1 can be relatively high.

FIG. 3A shows another embodiment of the present invention. To explain this FIG. 3A, in FIG.
The parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

The light source device 1 of the example of FIG. 3A has a light source 2 composed of a halogen lamp or the like, a condenser lens 3 for directing a light beam from the light source 2 inward, an infrared cut filter 4 for cutting infrared rays, and a cylindrical lens 12. And a diffusion plate 11 having a diffusion portion formed in a slit shape.

Further, the light receiving device 6 is an image pickup lens 7 arranged along the optical axis 1a of the light source device 1 and a CC which is a photoelectric conversion element on which the image pickup light from the image pickup lens 7 is incident.
It is composed of a D line sensor 8.

As the diffusion plate 11 of this light source device 1, for example, as shown in FIG. 3B, a slit-shaped diffusion portion 1 is formed on transparent glass.
The one provided with 1a is used. The diffusing plate 11 is formed by subjecting transparent glass to a frost process of sandblasting in a slit shape so that the slit-shaped portion 11a has a diffusing effect.

In this example, the cylindrical lens 12 and the diffusing plate 11 allow the slit-shaped diffusing portion 11a of the diffusing plate 11 to pass through when the film 9 is not inserted between the light source device 1 and the light receiving device 6. Diffused light 11
b is made incident on the image pickup lens 7, and the light 11c passing through the transparent portion of the diffusion plate 11 is made not made incident on the image pickup lens 7.

In this case, the diffused light 11b passing through the diffusing portion 11a of the diffusing plate 11 is weaker (the amount of light is smaller) than the light 11c passing through the transparent portion.

Further, as shown in FIG. 3A, this light source device 1
Between the light receiving device 6 and the light receiving device 6, the film 9 can be transferred at a predetermined speed so as to be orthogonal to the optical axis 1a of the light source device 1 and the optical axis 6a of the light receiving device 6, respectively. Otherwise, the configuration is the same as the conventional one.

Since the film image reading device as shown in FIG. 3A is constructed as described above, when the film 9 has no scratches 9a, it passes through the slit-shaped diffusing portion 11a of the diffusing plate 11 of the light source device 1. The diffused light 11b that has passed through the film 9 is supplied to the CCD line sensor 8 via the imaging lens 7, and the CCD line sensor 8 obtains image data.

In this case, since the image data is obtained by the diffused light, the graininess of the film 9 is unlikely to occur, and the image data having a good S / N can be obtained.

Further, in the portion of the scratch 9a of the film 9, as shown in FIG.
As shown in FIG. 3, the scattered light 11b from the slit-shaped diffusing portion 11a of the diffusing plate 11 of the light source device 1 is scattered by the scratch 9a in the direction of the imaging lens 7 and the film 9 passing through the transparent portion of the diffusing plate 11 On the other hand, the light obtained by adding the light 11c from the oblique direction to the light in the direction of the imaging lens 7 which is the scattered light due to the scratches 9a is supplied to the imaging lens 7, and the diffused light 11b from the slit-shaped diffusing section 11a is supplied. The amount of light reduced by the scratch 9a can be compensated for by the scattered light of the light 11c that has passed through the transparent portion, and the image data does not show only the scratch 9a.
The same image data can be obtained as when there is no.

In this case, since the diffusivity of the slit-shaped diffusing portion 11a of the diffusing plate 11 may be relatively small, the light source device 1
The efficiency of the light source 2 can be made relatively high.

In the embodiment of FIG. 3A, a diffuser plate 5 may be provided between the cylindrical lens 12 and the diffuser plate 11 if necessary.

FIG. 4 shows still another embodiment of the present invention. 4 will be described. In FIG. 4, parts corresponding to those in FIGS. 5 and 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

The light source device 1 of the example of FIG. 4 includes light sources 2a and 2b composed of two halogen lamps and the like, a condenser lens 3 for directing the light flux from the two light sources 2a and 2b to the inside, and an infrared ray cut. The infrared cut filter 4 and the diffusion plate 5 are provided. As the diffusion plate 5, a transparent glass is subjected to a frost treatment by sandblasting so as to have a diffusion effect, and one having an elliptical directivity is used.

The light receiving device 6 is composed of an image pickup lens 7 and a CCD line sensor 8 which is a photoelectric conversion element on which the image pickup light from the image pickup lens 7 is incident.

In the present example, as shown in FIG. 4, the two light sources 2a and 2b of the light source device 1 are arranged symmetrically with respect to the optical axis 6a of the light receiving device 6 as viewed from above, and the two light sources 2a and 2b are arranged symmetrically. The lights b ₁ and b _{2 in} the optical axis directions of the light sources 2a and 2b are prevented from entering the image pickup lens 7, and the diffused light 5a from the diffusion plate 5 enters the image pickup lens 7.

In this case, when the film 9 is not inserted between the light source device 1 and the light receiving device 6, the light incident on the imaging lens 7 from the light source device 1, that is, the diffused light 5a from the diffusion plate 5 is used.
Is weaker (the amount of light is smaller) than the light not incident on the image pickup lens 7, that is, the light b ₁ and b _{2 in} the optical axis direction of the light sources 2a and 2b.

Further, as shown in FIG. 4, the film 9 can be transferred at a predetermined speed between the light source device 1 and the light receiving device 6 so as to be orthogonal to the optical axis 6a of the light receiving device 6.
Otherwise, the configuration is the same as the conventional one.

Since the film image reading apparatus according to the example of FIG. 4 is constructed as described above, the film 9 has a scratch 9a.
When there is no diffused light 5a from the diffuser plate 5 of the light source device 1
The light transmitted through the film 9 of the CC through the imaging lens 7
The CCD line sensor 8 is supplied to the D line sensor 8.
More image data can be obtained.

In this case, since the image data is obtained by the diffused light, the graininess of the film 9 is unlikely to occur, and the image data having a good S / N can be obtained.

Further, in the portion of the scratch 9a of the film 9, as shown in FIG.
As shown in FIG. 5, the scattered light 5a from the diffusion plate 5 of the light source device 1 is scattered by the scratches 9a and is the light 5a in the direction of the imaging lens 7.
_0, the light source device 1 of the two light sources 2a and the optical axis of the light b ₁ and b ₂ of the light scattered by the scratches 9a imaging lens 7 direction of light and the addition light imaging lens than 2b 7 The light amount reduced by the scratch 9a of the diffused light can be compensated for by the scattered light of the scratches 9a of the lights b ₁ and b _{2 in} the optical axis direction. Only the portion does not become dark, and the same image data as in the state without the scratch 9a can be obtained.

In this case, since the two light sources 2a and 2b are arranged symmetrically, the symmetry of this correction has a good advantage, and the diffusion rate of the diffusion plate 5 can be relatively small.
The efficiency of the light sources 2a and 2b of the light source device 1 can be made relatively high.

The present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0044]

According to the present invention, the image pickup lens 7 is provided at the scratch 9a portion of the film 9 when the film 9 is not inserted.
The light in the direction of the image pickup lens 7 of the scattered light due to the scratches 9a of the light incident on the light is added to the light of the relatively strong light not entering the image pickup lens 7 in the direction of the image pickup lens 7 of the scattered light due to the scratches 9a. Since it is incident on the imaging lens 7,
The decrease in the amount of light at the scratch 9a portion of the film 9 is compensated for,
There is an advantage that only the portion of the scratch 9a does not become dark and the same image data as when there is no scratch 9a can be obtained.

[Brief description of drawings]

FIG. 1A is a top view showing a configuration of an embodiment of a film image reading apparatus of the present invention. 1B is an enlarged view of a main part of FIG. 1A.

FIG. 2 is a diagram for describing the present invention.

FIG. 3A is a top view showing the configuration of another embodiment of the present invention. 3B is a front view showing an example of the main part of FIG. 3A. FIG.

FIG. 4 is a top view showing the configuration of another embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of an example of a conventional film image reading device.

FIG. 6 is a top view of the example of FIG.

FIG. 7 is a diagram for explaining FIG. 5;

[Explanation of symbols]

1 light source device, 2, 2a, 2b light source, 3 condenser lens, 4 infrared cut filter, 5, 11 diffuser plate,
6 light receiving device, 7 imaging lens, 8 CCD line sensor, 9 film, 9a scratch, 12 cylindrical lens

Claims (4)

[Claims] 1. A film image reading device in which a film is inserted between a light source device and a light receiving device having an imaging lens and a photoelectric conversion element, and an image of the film is read, when the film is not inserted. The film image reading apparatus according to claim 1, wherein the light incident on the imaging lens from the light source device is weaker than the light not incident on the imaging lens. 2. The film image reading apparatus according to claim 1, wherein the light source device is tilted so that the optical axis light does not enter the imaging lens when the film is not inserted. apparatus. 3. The film image reading apparatus according to claim 1, wherein the diffuser plate of the light source device has a slit shape and a cylindrical lens is provided, and light passing through the slit diffuser plate is provided when the film is not inserted. A film image reading device, characterized in that only the light enters the imaging lens. 4. The film image reading device according to claim 1, wherein two light sources of the light source device are provided and optical axis light of the two light sources does not enter the imaging lens when the film is not inserted. A film image reading device characterized in that