JPH04369185A - Film picture input device - Google Patents

Abstract

PURPOSE:To make the size of a film picture input device small and to reduce the cost by which a developed still photo film is picked up and displayed on a video monitor. CONSTITUTION:The picture of a developed still photo film 20 is projected on a light receiving face of an image pickup element 24 according to principles of shadow picture. That is, a collimated light radiates to the developed still photo film 20 from a spot light source 10 through a condenser lens 14 and the collimated light passing through the developed still photo film 20 is made incident in the light receiving face of the image pickup element 24. Thus, the image forming optical system is omitted and the small sized device is realized inexpensively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film image input device, and more particularly, it captures an image of a developed still photographic film using an imaging means, converts it into an image signal, and outputs the image signal to a video monitor. The present invention relates to a film image input device for reproducing images on a video monitor.

0002

2. Description of the Related Art Conventionally, a film image input device for reproducing an image of a developed still photographic film on a video monitor is known from USP. 4,482,924, USP. 4,48
5,406, U.S.P. 4,506,300, WO9
0/04301 etc. is publicly known. This type of film image input device includes a film feeding system including a supply reel and a take-up reel for feeding developed still photographic film, an illumination unit for illuminating the film, an imaging optical system consisting of a photographic lens, and a CCD. It consists of an image sensor and an image signal processing circuit.

The film is fed frame by frame between the illumination unit and the photographic lens. The image on the film is illuminated by illumination light from an illumination unit, and the illuminated film image is photographed by a photographing lens and formed on a CCD. As a result, the film image is converted into an image signal by the CCD, subjected to signal processing by the image signal processing circuit, and then outputted as a video signal to the video monitor and reproduced on the video monitor.

FIG. 2 is a diagram showing an example of an imaging section of a conventional film image input device. As shown in the figure, the imaging section of this film image input device is composed of an illumination unit 1 consisting of a fluorescent lamp and a diffusion plate, an imaging optical system 3 including an aperture 2, and an imaging device (CCD) 4. . Note that 5 is a developed still photographic film that is illuminated by the illumination light from the illumination unit 1.

[0005] Here, a specific example of the imaging optical system 3 is shown in Table 1.

[0006]

[Table 1] In Table 1 above, R is the radius of curvature, D is the surface spacing, and N
d is the refractive index with respect to the spectral d-line (587.56 nm), νd is the dispersion, and Nd and νd indicate optical properties specific to each glass.

According to the imaging optical system 3, the object-image distance
202 mm (distance between film and CCD light receiving section) Magnification -1.0 Effective Fno 4.4.

[0008]

By the way, the imaging optical system 3 of the conventional film image input device described above requires a distance of 202 mm between the film 5 and the light receiving section of the CCD 4. Furthermore, as an application example of the imaging optical system, a method of bending the optical path with a mirror can be considered, but there is a problem that the basic total optical path remains the same and becomes more complicated due to the mirror. As a result, the size of the imaging optical system has increased, leading to an increase in cost.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a small and inexpensive film image input device by omitting an imaging optical system.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an illumination means that generates parallel illumination light, and an image pickup device arranged so that the illumination light is perpendicularly incident on a light receiving surface. and means for setting a developed still photographic film between the illumination means and the image pickup device so that the illumination light is incident perpendicularly to the film surface, and an image signal indicating the film image converted by the image pickup device. an image signal processing means for performing predetermined signal processing on the signal and then outputting the signal to a video monitor;
It is characterized by having the following.

[0011]

According to the present invention, a film image is projected onto the light-receiving surface of the image pickup device using the principle of shadow photography. That is,
The developed still photographic film is illuminated by an illumination means that generates parallel illumination light, and the parallel light transmitted through the developed still photographic film is guided to the light receiving surface of the image pickup device. This allows the imaging optical system to be omitted, resulting in a compact and inexpensive device.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the film image input device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a diagram showing an embodiment of an imaging section of a film image input device according to the present invention. As shown in the figure, the imaging section of this film image input device mainly consists of a point light source such as a halogen lamp.
0, a condenser lens 14 for converting the diverging light from the point light source 10 into parallel light, and an imaging device (CCD)
It consists of 24.

Note that 12 is a cold filter for preventing heat, and is made of, for example, a glass plate coated with an infrared reflective film or heat-absorbing glass. Further, 16 and 18 are respectively polarizing filters, and the polarizing filter 16 is fixedly disposed,
The polarizing filter 18 is rotatably arranged, and the amount of light can be adjusted by rotating the polarizing filter 18 to an appropriate rotational position. Furthermore, 20 is a developed still photographic film, and 22 is an optical low pass filter (OLPF).

The film 20 is set electrically or manually using a film feeding means (not shown) or the like so as to be perpendicular to the parallel light. The film 20 is preferably set at a position closest to the CCD 24, as shown in FIG. Further, the effective area of the CCD 24 is 1 of the film 20.
The same area as the top (for example, 24 x 36 mm) is used.

Next, the operation of the imaging section having the above configuration will be explained. Divergent light from a point light source 10 enters a condenser lens via a cold filter 12, where it is converted into parallel light. This parallel light is transmitted through polarizing filters 16, 1
After the light amount is adjusted through the OLPF 22, the developed still photographic film 20 is irradiated with the parallel light. This incident light is converted by each sensor on the light receiving surface of the CCD 24 into an amount of signal charge corresponding to the intensity of the light. These signal charges are sequentially read out and applied to an image signal processing circuit (not shown).

The image signal processing circuit includes a known sample hold circuit, white balance circuit, gamma correction circuit, matrix circuit, encoder circuit, etc. After performing predetermined signal processing by these circuits, an image representing a film image is generated. The signal is output to a video monitor (not shown). As a result, the image of the film 20 is displayed on the video monitor.

When the film 20 is a negative film, the image signal processing circuit also performs signal processing for negative/positive inversion. Furthermore, by narrowing the signal readout area within the effective area of the CCD 24, it is possible to electronically enlarge the image. Furthermore, by using a film printed smaller than the original plate, mass-produced CCDs of, for example, 1/3 inch size can also be applied.

Note that a Fresnel lens may be used instead of the condenser lens 14 of this embodiment, and with this, the imaging section can be further downsized. Further, instead of the polarizing filters 16 and 18, filters whose amount of transmitted light can be controlled by voltage may be used.

[0019]

[Effects of the Invention] As explained above, according to the film image input device according to the present invention, since an image is created on the imaging surface based on the principle of shadow puppetry, an imaging optical system can be omitted. It is possible to reduce the size and cost of the device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of an imaging section of a film image input device according to the present invention.

FIG. 2 is a diagram showing an example of an imaging section of a conventional film image input device.

[Explanation of symbols]

10...Point light source 14...Condenser lens 16, 18...Polarizing filter 20...Developed still photographic film 24...Image sensor (CCD)

Claims (2)

[Claims] Claim 1: Illumination means for generating parallel illumination light;
an imaging device disposed so that the illumination light is incident perpendicularly to the light receiving surface; and a developed still photographic film is placed between the illumination means and the imaging device so that the illumination light is incident perpendicularly to the film surface. and an image signal processing means for performing predetermined signal processing on an image signal representing a film image converted by the image pickup device and outputting the resultant to a video monitor. Device. 2. A film image input device according to claim 1, wherein said illumination means comprises a point light source and a lens for converting diverging light from said point light source into parallel light.