JPS6247390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system for displaying recorded images in a two-dimensional scanning manner by electrically scanning the image of each frame while continuously feeding a frame-by-frame image recording body. The present invention relates to an image conversion device that converts an image signal, that is, a TV signal.

A device having such a function is conventionally generally called a tele-cinema device, but in the conventionally known tele-cine device, a flying spot tube is used to scan a recorded image, that is, a film image. Two-dimensional scanning devices, such as cameras and color image pickup tubes, were used. The drawbacks of these conventional devices are that the two-dimensional scanning devices are expensive and that the film is fed intermittently. In order to eliminate the noise and vibration caused by intermittent film feeding, there is a method that rotates a prism in synchronization with film feeding to keep the scanned image relatively still. It was difficult to avoid such upsets.

The present invention eliminates all such conventional drawbacks,
As this type of image conversion device, an inexpensive one-dimensional optical sensor can be used without using an especially expensive secondary scanning device.
The combination of an array and an optical scanning means is more advantageous than scanning the recorded image of each frame two-dimensionally while continuously feeding a frame-by-frame recording medium and converting it into an image signal for two-dimensional scanning display. This device was developed with the aim of providing a type of device that is unique to the recording medium, and is characterized by an optical system that images and illuminates the recording medium with light from a light source in a relationship perpendicular to the feeding direction of the recording medium. an optical polarizer placed in the illumination optical path of the illumination optical system for moving the line image illumination; and a primary polarizer for electrically scanning in a direction along the illumination line image by the illumination optical system. An illumination line image on the recording medium by the original optical sensor array and the illumination optical system is formed onto the optical sensor array so that an imaging relationship is established in the scanning direction of the optical sensor array. and an imaging optical system that continuously converts images by moving the imaged line image illumination by the optical deflector in the same direction or in the opposite direction to the feeding direction of the recording medium. It is in what you have done that you can do.

Embodiments of the image conversion device according to the present invention will be described above with reference to the accompanying drawings.

First of all, FIGS. 1 to 3 show a first embodiment of the present invention. In these figures, a light beam from a point light source 1 is transmitted through a condenser lens 2 and a pin hole in a pin hole plate 3. 3a and collimating lens 4, it becomes a parallel light beam A, which is reflected by a rotating polyhedral reflector (hereinafter referred to as
It is written as polygon mirror. )5. A light beam B reflected by one reflecting surface 51 of the polygon mirror 5 passes through a cylindrical lens system 6 and is incident on a film F that has been photographed frame by frame. The cylindrical lens system 6 has a light condensing property only in the longitudinal direction of the film F, and the film F is placed at the focal point of the cylindrical lens system 6. Therefore, the polygon mirror 5 The reflected light beam B from the reflecting surface 51 is focused only in the vertical direction by the cylindrical lens system 6, and is imaged on the film F as a line image _IH . The light beam C that has passed through the film F enters the photodetector 9 via the cylindrical lens 7 and the spherical lens 8, which have a condensing property in a direction perpendicular to the cylindrical lens system 6. At this time, lens 7
and 8, the illumination image on the film F and the projected image on the photodetector 9 are arranged only in the direction perpendicular to the running direction of the film F, that is, in the horizontal direction in the figure.
It is assumed that an imaging relationship is established. At this time, the light beam diffracted by the image on the film at the point P _H in the line image I _H is detected by the photodetector 9 as shown by the broken line in the figure.
A line image I _V is formed on the top. On the other hand, the light beam B' reflected by another reflective surface 51' adjacent to the reflective surface 51 of the polygon mirror 5 passes through the cylindrical lens system 6 and forms a line image on the film F.
After reaching I′ _H , the light passes through the cylindrical lens 7 and the spherical lens 8 and enters the photodetector 9.

The photodetector 9 includes three one-dimensional optical sensor arrays 10RR, 10G, and 10B, and each optical sensor array.
Filters 11R, 11G, and 11B with mutually different spectral transmittance distributions placed immediately before the array
It consists of For example, filter 11R,1
1G and 11B transmit red, green, and blue light, respectively, from the optical sensors in each optical sensor array 10R, 10G, and 10B corresponding to the line image I _V , a point on the film F is transmitted. A signal representing the intensity of the red, green, and blue light components of P _H will be obtained. Therefore, the optical sensor array 10R, 10
When G and 10B are electrically scanned at the same time, the signals obtained become electrical signals of the red, green, and blue color components obtained by scanning the line image I _H on the film F. Here, the point P _H on the film F is out of focus with respect to the photodetector 9. The amount of defocus needs to be such that the vertical spread of the line image I _V on the photodetector 9 sufficiently covers the size of the photodetector 9 in the vertical direction. Further, the reflecting surface 51 of the polygon mirror 5 and the light receiving surface of the photodetector 9 are approximately in an imaging relationship. As a result, the polygon mirror 5 rotates in the direction of the arrow in FIG.
1 from the position indicated by 51 ₁ in Figure 3 to 51 ₂
Even if the line image I _H on the film F moves from the position I _H1 to the position I _H2 in FIG. will be illuminated continuously.

Next, a description will be given of how an image on film F is converted into a television image signal in the apparatus shown in FIGS. 1 to 3. First, set the frame feed speed of film F to p
frames per second, and the number of scanning fields per unit time of television is q fields/second. In this embodiment, in order to use the signal obtained by electrically scanning the photodetector 9 as a television signal without using a special memory, the scanning time of the photodetector 9 must be equal to the horizontal scanning of the television. It is necessary to make it equal to the time. Furthermore, a necessary condition is that one frame of film F be scanned in the vertical direction in 1/q seconds in which one field of the television is scanned.

In this embodiment, since the film F moves by p/q frames in 1/q seconds, the line image I on the film F
_H needs to move on film F by the remaining (1-p/q) frames. Furthermore, in order to prevent harmful fluctuations from occurring in the television signal obtained by continuously feeding the film F, it is necessary that the line image I _H move on the film F at a constant speed. In order to satisfy this condition, the cylindrical lens system 6 needs to have the well-known f-θ characteristic, that is, the characteristic that the height of the image is proportional to the angle of incidence of the incident light beam. Of course, this f-θ characteristic is f
- It is also possible to obtain it by other methods without using the θ lens. For example, as shown in Figure 4, the film F
A line image I generated on the film F by moving it curvedly along a suitable curved surface such as a part of a cylinder.
The position of _H may be made proportional to the angle of incidence of the incident light beam. Incidentally, at this time, the image plane determined by the lenses 7 and 8 must also match the curved surface formed by the film F.

In this way, when the f-θ relationship is satisfied, a set of light beams reflected by adjacent surfaces of the polygon mirror 5 maintain a constant distance from each other when the polygon mirror 5 rotates at a constant speed. They become a set of line images moving at a constant speed. If the focal length of the cylindrical lens system 6 is appropriately determined in _FIG . The line image I' _H can be made exactly equal to the pitch of the image frames of the film F. In this case, line image I _H and line image I' _H are frames of film F.
The same position of f ₁ and frame f ₂ will be illuminated, and from the sensor corresponding to the line image I _V on the photodetector 9, the frame will be illuminated.
Information from point P _H on f ₁ and point P' _H on piece f ₂ will be read out in a superimposed manner. That is, since information from two frames is read out in a superimposed manner, it is possible to automatically convert the number of frames without fluctuations in brightness (flicker) when converting the number of frames. According to the above explanation, image conversion is performed in which the film F is continuously fed at a speed of p frames/second, and the line image I _H is scanned at a speed of (qp) frames/second in the opposite direction to the feeding direction of the film F. It is clear that by rotating the polygon mirror 5 at a predetermined speed, frame number conversion and vertical scanning of the screen can be performed simultaneously.

In the above embodiments, a rotating polyhedral reflecting mirror is used as the optical deflector, but it is also possible to use a well-known transmission prism as the optical deflector. A second embodiment of the present invention using this transmission type prism is shown in FIG. In the figure, a light beam emitted from a point light source 1 is condensed by a condenser lens 2, passes through a pinhole 3a of a pinhole plate 3, and then becomes a parallel beam by a collimating lens 4. Cylindrical
The light enters the lens system 12. Since the cylindrical lens system 12 has a light focusing ability only in the vertical direction, the parallel light beam forms a slit image extending in the horizontal direction. The rotating polyhedral prism 13 is placed between the cylindrical lens system 12 and the film F, and the light flux incident from the surface 131 of the prism 13 is refracted by the prism 13 to the surface 132.
The line image I _H is formed. One side 13
The light beam incident from 1' is refracted by prism 13 and exits from surface 132', forming a line image _I'H . As is conventionally known in tele-cinema devices using high-speed cameras and transmission prisms, when the prism 13 is rotated in the direction of the arrow in the figure, line images I _H , I' _H
moves on the film F at approximately constant speed. Therefore, by designing the prism 13 to an appropriate size and making the interval between the line images I _H and I' _H equal to the interval between the frames, the number of frames can be converted using the same procedure as in the first embodiment described above. and scanning are performed simultaneously,
Image information compatible with the television signal is read out.

In the above description, the cylindrical lens system 6 or 12, the cylindrical lens 7, and the spherical lens 8 may be arranged in any manner as long as the same effect can be obtained.
The lens 7 and the spherical lens 8 can also be configured as a single lens system.

In addition, in FIG. 5, the transmission prism 13 is not limited to the simple configuration shown in the figure, but can be of any configuration conventionally used for the purpose of aberration correction in high-speed cameras and telecine equipment. It is also possible to use For example, Journal of S.
MPTE Vol. 86, pages 431-438 (1977
All of the many ideas introduced in 2003 can be used in the present invention.

In addition, in the embodiment, the photodetector 9 includes three optical sensor arrays 10R, 10G, 10B,
Although a combination of color filters 11R, 11G, and 11B is shown, any known technique can be used as long as it can electrically perform one-dimensional scanning and obtain color signals. For example, in addition to this color filter, yellow,
Combinations such as white and cyan are also possible, and color stripes and
It is also possible to use a combination of filters or a known three-color separation system.

In particular, FIG. 6 shows an example of preventing fluctuations in the balance of the amount of light incident on three optical sensor arrays. In FIG. 6, immediately before two of the three optical sensor arrays 10Y, 10W, 10C are filters 11Y having yellowish and cyan spectral transmittances, 11C, and three optical sensor arrays 10Y, 10W, and 10C are configured to detect yellow, white, and cyan color information, respectively. And filters 11Y, 11C
A lenticular lens 14 continuous in the horizontal direction is placed immediately in front of the lenticular lens 14, so as to stretch the images formed on each of the optical sensor arrays 10Y, 10W, and 10C in the vertical direction. As a result, even if there is uneven light intensity between the respective optical sensor arrays 10Y, 10W, and 10C before placing the lenticular lens 14, the lenticular lens 14
4 makes the amount of light uniform. In addition, since the lenticular lens 14 has no function in the horizontal direction, the film F
This has no effect on the decomposition and detection of the above image.

As explained above, the present invention continuously feeds a recording medium in which frame photography is taken, and obtains a television signal by electrically scanning an inexpensive one-dimensional optical sensor array.
This is a very useful method for this type of image conversion device.

In particular, in the present invention, the light from the light source is imaged on the recording medium in a relationship perpendicular to the feeding direction thereof, two linear illuminations are formed by a rotatable regular polygonal columnar optical deflector, and the linear illumination is Since the interval is made equal to the frame interval of the recording medium, illumination efficiency can be increased when performing electrical scanning of the line sensor, and as shown in Fig. 1, two line image illumination Because the information of images at the same position on two frames is read out in a superimposed manner, when converting the number of frames, it is possible to automatically convert the number of frames without fluctuations in brightness (flicker) and to obtain a signal with a good signal-to-noise ratio. You can get it.

Furthermore, in the first embodiment of the present invention, since a rotating polyhedral reflecting mirror is used as the optical deflector,
It has the advantage that chromatic aberration, astigmatism, etc. do not occur at all, and in particular, in this case, it also has the advantage that it can be constructed at a low cost because any material such as aluminum or iron can be freely selected as the material for the rotating polyhedral reflecting mirror. Also,
The second embodiment of the present invention also has the advantage that it is easy to correct aberrations because it is sufficient to simply create linear illumination and aberrations in the longitudinal direction can be ignored.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the arrangement of main parts of a first embodiment of the present invention, and FIGS. 2 and 3 are views of the main parts of the arrangement shown in the first diagram from above and from the side, respectively. FIG. 4 is a diagram showing a modified example of the first embodiment of the present invention, and FIG. 5 is a perspective view showing the arrangement of main parts of the second embodiment of the present invention. FIG. 6 is a diagram showing an improved example of a photodetector applicable to the present invention. In the figure, F is a continuously fed film, f ₁ and f ₂ are image frames on film F, I _H and I' _H are illumination line images on film F, 1 is a point light source, and 3 is a pinhole plate. ,
4 is a collimating lens, 5 is a rotating polyhedral reflector, and 6 and 13 are f-θ cylindrical lenses for illumination.
Lens system, 7 is a cylindrical lens for imaging,
8 is a spherical lens for imaging, 9 is a photodetector, 10R,
10G, 10B and 10Y, 10W, 10C are optical sensor arrays, 11R, 11G, 11B and 1
1Y and 11C are color filters, and 14 is a transmission type rotating polyhedral prism.

Claims (1)

[Claims] 1. An image converting device that continuously feeds a recording medium containing frame-by-frame images, and at this time scans the image of each frame and converts it into an image signal for two-dimensional scanning display; an illumination optical system that forms an image of the light from the light source in a relationship perpendicular to the feeding direction and illuminates the line image; and an illumination optical system placed in the illumination optical path of the illumination optical system to form and move the two line image illuminations. a rotatable regular polygonal prism optical deflector; a one-dimensional optical sensor array that performs electrical scanning in a direction along an illumination line image by the illumination optical system; and an illumination image on the recording medium by the illumination optical system. an imaging optical system that forms an image on the optical sensor array in such a way that an imaging relationship is established with respect to the scanning direction of the sensor array; rotating at a predetermined speed, the movement direction of the two imaged line image illuminations due to the rotation is the same direction or the opposite direction to the feeding direction of the recording body, and the interval between the line image illuminations is adjusted. An image conversion device characterized in that image conversion can be performed continuously by making the image conversion equal to the frame spacing of a recording medium.