JPH0767030A - Telecine device - Google Patents

Abstract

PURPOSE:To prevent image distortion without using any expensive lens by storing an output from a CCD when there is no deviation in the arrangement when the light of a film image is optically deviated or not deviated by a selecting means. CONSTITUTION:Under the control of a CPU 34, a film driving circuit 37 intermittently scrapes off a film 14. On the other hand, a shutter driving circuit 38 drives a shutter 17 under the control of the CPU 34. During a telecine converting term after the film 14 is scraped off, a shutter 27 is twice opened, and CCD 23r, 25g and 27b are twice exposed. During the latter half of this term, an optical axis is shifted for a 1/2 pitch. Therefore, the respective outputs of the CCD become the output for which the optical axis is not shifted and the output for which the optical axis is shifted. Those outputs are written in a frame memory 29 and continuously written in a frame 30. Then, while it is written in one frame memory, the output is read from the other frame memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telecine device suitable for application to, for example, a so-called telecine device for picking up an image of a film and taking out an image of the film as a video signal.

[0002]

2. Description of the Related Art Conventionally, so-called telecine (telecine) for converting image information of a film such as a movie into a television signal (video signal).
As an example of a device for combining words and cinema, there is one shown in FIG.

The telecine device shown in FIG. 9 has a projector 1 having a lens system 2 including a scraping mechanism (not shown) for intermittently feeding the photographed 35 mm film or the like frame by frame and an anamorphic lens. , This projector 1
A shutter 4 for blocking light supplied from the lens system 2 through a lens system 2, and a motor 5 for driving the shutter 4.
And a spectroscopic system path 3 having a dichroic mirror (not shown) for splitting the light from the projector 1 into red component light (R), green component light (G) and blue component light (B). Red, green and blue component light (R, G and B) from the spectroscopic system path 3
Image pickup tubes 6r, 6 such as a Sachicon for photoelectrically converting the
g and 6b, with respect to the outputs from the preamplifiers 7r, 7g and 7b, and the preamplifiers 7r, 7g and 7b, which perform processing so that the photoelectric conversion outputs from the respective image pickup tubes 6r, 6g and 6b have a high S / N ratio. Process amplifier 8 for performing various processes such as blanking mixing, black clip, gain control, pedestal adjustment, shading correction, and gamma correction.
r, 8g and 8b.

Next, the operation of the telecine device shown in FIG. 9 will be described. When a 35 mm film set on the projector 1 is irradiated with light from a light source (not shown), the projector 1
The image information on the 35 mm film is emitted as light through the lens 2 and the emitted light is separated into red, green and blue component lights (R, G and B) by a dichroic mirror (not shown) in the spectroscopic system path 3. .

On the other hand, the film is scraped off by a film scraping mechanism (not shown) of the projector 1 at a rate of, for example, 24 frames per second.
The shutter 4 is driven by this, whereby the image information of the film is supplied to the image pickup tubes 6r, 6g and 6b one frame at a time.

The light of the red, green and blue components respectively supplied to the image pickup tubes 6r, 6g and 6b is supplied to the respective image pickup tubes 6r, 6g and 6b.
Are photoelectrically converted at the preamplifier 7r,
7g and 7b are supplied to process amplifiers 8r, 8g and 8b, respectively.

And process amplifiers 8r, 8g and 8b
In the above, after being subjected to the above-mentioned various processes, it is supplied to a color encoder or the like (not shown) via the output terminals 9r, 9g and 9b, and is output as a video signal of a television system such as an NTSC system.

Since the image recorded on the film is compressed in the horizontal direction, the anamorphic lens described above is used to expand the image twice in the horizontal direction.

The applicant first superimposes characters and figures designating a trimming position at a predetermined position on the film screen and the number of frames on the film screen and records them on a magnetic tape, and then reproduces the magnetic tape. Then, a film editing method is proposed in which data such as the trimming position of the film screen and the number of frames thereof are created, and the trimmed recording tape is obtained by controlling the telecine device based on the data such as the number of frames. (See JP-A-58-182384).

[0010]

However, the above-described conventional telecine apparatus has a disadvantage that a very expensive anamorphic lens must be used in order to expand a horizontally compressed image in the horizontal direction. It was Since the anamorphic lens usually has a cylindrical shape, a special polishing device is used for forming a curved surface, and therefore the price of the anamorphic lens becomes expensive.

When an image on a film is expanded in the horizontal direction by using an anamorphic lens and a CCD is picked up to obtain a video signal, the obtained video signal is displayed on a television monitor. In addition, there is an inconvenience that the image has so-called screen distortion (tal, pin, etc.), and the image after telecine conversion is significantly deteriorated.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a telecine device capable of obtaining a video signal of good image quality without using an expensive anamorphic lens. .

[0013]

The present invention provides a film 14
Of the image of the film 14 at least optically by the CCD 23r, in the telecine device in which the image signals of the images are captured by the CCDs 23r, 25g and 27b.
Selecting means 28a, 28b, 34 for selecting whether or not to shift by 1/2 pitch of the minimum imaging unit of 25g and 27b;
Storage means 29 for obtaining at least one image based on the outputs from the CCDs 23r, 25g and 27b when the light of the image on the film 14 is optically shifted by the selection means 28a, 28b and 34, and when the light is not shifted. Three
0 and at least control means 40 for controlling the storage operation of the storage means 29, 30.

Further, in the above-mentioned invention, the selection means includes:
At least an optical axis shift means 28a for shifting the light of the image of the film 14 by 1/2 pitch, and an optical axis shift control means 28b for controlling whether or not the optical axis shift means 28a performs the optical axis shift, 34 and 34.

Further, in the present invention, in the above description, the optical axis shifting means 28a is an optical system capable of shifting at least the optical axis of the light of the image on the film 14, and the optical system is mechanically
Alternatively, it is configured by electrically driven driving means 28b, 51, 34.

Further, in the present invention described above, the glass plate 52 is used as the optical system, and the glass plate 52 is used as the driving means 51.
The optical axis of the image of the film 14 is shifted by changing the position on the optical axis by driving the optical axis.

Further, the present invention uses the deflecting plate 54, the liquid crystal plate 55 and the crystal plate 56 as an optical system in the above description, and the light of the image on the film 14 is narrowed down to one row in the polarization plane by the deflecting plate 54, and in this one direction. The liquid crystal 5
5 of the light incident on the liquid crystal plate 55 by irradiating the liquid crystal plate 5 and driving the liquid crystal plate 55,
The normal light or the abnormal light is obtained by changing every read cycle of 53, the normal light or the abnormal light is made incident on the crystal plate 56, and the optical axis of the abnormal light is shifted from the optical axis of the normal light. It is a thing.

Further, the present invention has the above-mentioned, at least one CCD 23r, 25g or 27b as a storage means.
Are provided with two frame memories 29 and 30, and the output of the CCD 23r, 25g or 27b obtained by optically shifting by 1/2 pitch is used as one of the frame memories 29 or 3.
The output of the CCD 23r, 25g or 27b, which is obtained by writing the data into 0 and not optically shifting by 1/2 pitch, is written into the other frame memory 30 or 29, and the one and the other frame memory 29 or 30, or 30 or 29.
The image signal for one screen is obtained by alternately reading from the above in units of samples.

Furthermore, the present invention has the above-mentioned, wherein at least one CCD 23r, 25g or 27b is used as a storage means.
Of the CCD 23r, 25g or 27b obtained by optically shifting by 1/2 pitch and the CCD 23r, 25g or 27b obtained by not optically shifting by 1/2 pitch. The output is alternately stored in the frame memory 29 every time the film 14 is scraped off.
Or write to 30 or 30 or 29,
Frame memory 29 or 30, or 30 or 29
The output of the CCD 23r, 25g or 27b written in is alternately read every time the film 14 is scraped off to obtain a video signal.

[0020]

According to the structure of the present invention described above, the film 14
At least optically the light of the image of CCD23r, 25g
And 27b are selected by the selecting means 28a, 28b, 34 for shifting by 1/2 pitch of the minimum imaging unit, and when the light of the image on the film 14 is optically shifted by the selecting means 28a, 28b, 34, And CC when not displaced
Based on the outputs from D23r, 25g and 27b, at least one image is stored in the storage means 29, 30 and the storage operation of the storage means 29, 30 is controlled by the control means 40.

Further in the above, according to the configuration of the present invention,
At least control of whether or not to perform optical axis shift with respect to the optical axis shift means 28a for shifting the light of the image on the film 14 by 1/2 pitch is controlled by the optical axis shift control means 28b and 34.

Further in the above, according to the configuration of the present invention,
At least an optical system capable of shifting the optical axis of the light of the image on the film 14 is mechanically or electrically driven by the driving means 28b, 51, 34.

Further in the above, according to the configuration of the present invention,
By driving the glass plate 52 by the driving means 51, the position on the optical axis is changed to shift the optical axis of the light of the image on the film 14.

Further in the above, according to the configuration of the present invention,
The polarization plane of the light of the image on the film 14 is narrowed down to one row by the deflection plate 54, and the liquid crystal 55 is irradiated with the light having the polarization plane narrowed down in one direction. The polarization plane of the incident light is changed at least at every reading cycle of the CCD 53 to obtain normal light or abnormal light, and the normal light or abnormal light is made incident on the crystal plate 56, and the abnormal light is emitted with respect to the optical axis of the normal light. To shift the optical axis of.

Further in the above, according to the configuration of the present invention,
CCD 23r, 25 obtained by optically shifting by 1/2 pitch
The output of g or 27b is written into one of the frame memories 29 and 30, and the output of the CCD 23r, 25g or 27b obtained without optically shifting by 1/2 pitch is written into the other frame memory 30 or 29, and A video signal for one screen is obtained by alternately reading from the frame memory 29 or 30, or 30 or 29 in units of samples.

Further in the above, according to the configuration of the present invention,
CCD 23r, 25 obtained by optically shifting by 1/2 pitch
The output of g or 27b and the output of the CCD 23r, 25g or 27b obtained without being optically shifted by 1/2 pitch are alternately written into the frame memory 29 or 30, or 30 or 29 each time the film 14 is scraped off, and the frame is written. The output of the CCD 23r, 25g or 27b written in the memory 29 or 30, or 30 or 29 is alternately read every time the film 14 is scraped off to obtain a video signal.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the telecine of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 10 is a projector for performing projection while intermittently feeding a 35 mm film or the like on which an image such as a movie is recorded by scraping operation. The projector 10 has an external lens 11 and an internal projector. An upper sprocket 12 and a lower sprocket 13 for guiding the film 14 wound on a film supply reel and a film take-up reel (not shown), a plate-like member 15 provided with a hole (aperture) for transmitting light, and a perforation of the film 14. A scraping mechanism 17 that intermittently feeds the film 14 by a scraping claw 16 hooked on the like, a shutter 18 connected to a motor (not shown) provided inside the scraping mechanism 16, and a reflecting mirror 20 that reflects light from a light 19. Constitute.

Reference numeral 21 is a light power source, and this light power source 21 turns on the light 19 based on a control signal from the CPU 34. The light of the light 19 is reflected by the reflecting mirror 20 and enters the film 14 through the shutter 18, and after passing through the film 14, enters the lens 11 through an optical axis shifter 28a, which will be described later. It is irradiated to the dichroic part.

The dichroic portion has a dichroic prism 22r having a reflecting surface for red component light (R) and a CCD attached to the dichroic prism 22r.
(Charge-coupled device) 23r, dichroic prism 24g having a reflection surface for green component light (G), CCD (charge-coupled device) 25g attached to this dichroic prism 24g, and reflection for reflecting blue component light (B). It is composed of a dichroic prism 26b having a surface and a CCD (charge coupled device) 27b attached to the dichroic prism 26b.

Here, the CCDs 23r, 25g and 27b
Each have a pixel number corresponding to, for example, a high definition television system, or have an aspect ratio equal to the aspect ratio of a cinemascope size screen. Therefore, when the image on the film 14 is compressed, about 1/2 of the image pickup area of each of the CCDs 23r, 25g and 27b is used.

The optical axis shifter 28a is driven by a drive signal from an optical axis shift drive circuit 28b, which will be described later, and shifts the optical axis of the light from the projector 10. In this example, the optical axis of the light of the image on the film 14 is shifted so that the CCD 23r,
Light incident between pixels of 25 g and 27 b and pixels (arbitrary unit cells and photodiodes of adjacent unit cells adjacent thereto) is made incident on the pixels, that is, the number of pixels in the horizontal direction is doubled. .

Since the image recorded on the film 14 is normally compressed to 1/2 in the horizontal direction, a film called an anamorphic lens is used to form the film 14.
The image is doubled in the horizontal direction, but it is not necessary to use an anamorphic lens by shifting 1/2 pixel as in this example, and as a result, an expensive lens is not used. It is also possible to prevent the screen distortion (tal, pin, etc.) due to the lens from occurring.

Reference numerals 29 and 30 are frame memories for storing the outputs of the CCDs 23r, 25g and 27b of the odd-numbered and even-numbered frames, respectively. For example, the frame memory 29 includes CCDs 23r, 25g and 27 for R, G and B.
The output when the optical axis shift from b is not performed is written by the write signal from the write / read control circuit 40, and the stored data is read by the read signal from the write / read control circuit 40. Here, the read speed by the read signal supplied from the write / read control circuit 40 to each of the frame memories 29 and 30 is, for example, half the write speed by the write signal.

The read speed is 1/2 of the write speed.
The read speed and the write speed may be the same, for example. For example, considering a high definition television system as an example, the number of pixels required for a video signal is 1920 (H) × 1035 (V). Since the pixels are shifted to 1920 (H), 960 (H) × 10
35 (V) CCD or 1920 (H)
It is sufficient to use only half of the × 1035 (V) CCD.

The number of written pixels is 960 (H) × 1035
(V) × 2, and the number of read pixels is 1920 (H) ×
1035 (V), which is equal. That is, assuming that the CCD data is transferred from the top to the bottom and from the right to the left to be output, when 960 pixels are transferred horizontally and one line is transferred vertically, the pixels on the right half of the CCD are transferred. The signal of will be discarded, and the left half signal will be output. The time required to output the signal on the left half of the CCD is also 1/2 of the time required to read all pixels (when the read frequency is the same). In this way, the read and write speeds may be the same.

Further, the frame memory 30 has R, G and B
The read / write control circuit 40 outputs the output from the CCDs 23r, 25g and 27b
From the write / read control circuit 40 to read the stored data.

Here, for example, the output of the CCDs 23r, 25g and 27b stored in the frame memory 29, that is, the pixel data, is obtained when the image light of the film 14 is directly incident on the CCDs 23r, 25g and 27b.
The pixel data stored in the frame memory 30 as the outputs obtained from 23r, 25g, and 27b is the CCD2.
When the optical axis of the light of the image on the film 14 is shifted by 1/2 pixel and incident on 3r, 25g and 27b, the CCD 2
The outputs are 3r, 25g, and 27b.

Therefore, the frame memory 29 stores pixel data corresponding to odd-numbered pixels in the horizontal direction,
This means that the frame memory 30 stores pixel data corresponding to even-numbered pixels in the horizontal direction. These two
The data stored in the one frame memory 29 and the data stored in the frame memory 30 are read out at a half cycle of the write cycle. Then, by switching the outputs of these two frame memories 29 and 30 at the sampling frequency, it is possible to obtain an image which is doubled in the horizontal direction while maintaining the optical resolution.

The data read out for each sample from the frame memories 29 and 30 is supplied to the process processing circuit 31 as a video signal, and in the process processing circuit 31, blanking mixing, black clipping, gain control, pedestal adjustment and shading are performed. After being subjected to processing such as correction and gamma correction, they are respectively supplied to the encoder 32, and after being encoded by the encoder 32 into color television signals of, for example, a high definition television system, an NTSC system, a PAL system, a SECAM system, etc. It is output via the output terminal 33.

The CPU 34 constitutes a microcomputer together with the ROM 35 storing various programs and the work RAM 36, and the write power supply circuit 21, the film drive circuit 37, and the shutter drive circuit 3 described above.
8 and the CCD drive circuit 39 are controlled.

The film drive circuit 37 rotates the take-up reel (not shown) on the basis of the control signal from the CPU 34 to wind the film 14 on the take-up reel,
The shutter drive circuit 38 drives the motor inside the film scraping mechanism 17 to rotate the shutter 18. The CCD drive circuit 39 drives the CCDs 23r, 25g, and 27b based on the control signal from the CPU 34 to read out the stored data in frames.

Here, a configuration example of the optical axis shifter 28 shown in FIG. 1 will be sequentially described with reference to FIGS. 2 and 3.

First, FIG. 2 will be described. In FIG. 2, 5
0 is a fulcrum, 51 is a driving device, 52 is a glass plate, 53 is C
CD (CCD 23r, 25g and 27b in FIG. 1)
Is equivalent to).

That is, the optical axis shifter shown in FIG.
The glass plate 52 is arranged vertically to the optical path indicated by the one-dot chain line in the figure, and a driving device 51 such as a DC motor is connected to the glass plate 52. The optical axis shifter rotates the glass plate 52 around the fulcrum 50 by the drive device 51 to move the glass plate 52 to the position shown by the broken line to obtain a desired angle α, and the original angle α is used to obtain the desired angle α. The light incident between the pixels of the CCD 53 is CC
It is incident on the pixel of D53.

Next, description will be made with reference to FIG. In FIG. 3, 54 is a deflection plate, 55 is a liquid crystal plate, 56 is crystal, and 57.
Is a CCD (in FIG. 1, CCDs 23r, 25g and 27
It corresponds to b).

That is, the optical axis shifter shown in FIG.
The deflection plate 54 and the liquid crystal plate 5 are arranged with respect to the optical path indicated by the alternate long and short dash line in the figure.
5 and the crystal 56 are arranged. This optical axis shifter narrows the polarization plane of light in one direction by the deflecting plate 54,
Further, the polarization plane of the light is rotated by the liquid crystal plate 55, for example, by 90 degrees or not for each frame, so that the normal light and the abnormal light can be selectively obtained.
Alternatively, by making the crystal plate 56 selectively transmit (extraordinary light), C of the light of the image on the film 14
The light that has entered between the pixels of the CD 57 is made to enter the pixels.

FIG. 4 shows a case where normal light is obtained by driving the liquid crystal plate 55. As shown in FIG. 4, the polarization plate of the film 14 whose polarization plane is narrowed in one direction is shown. The image light is incident on the liquid crystal plate 55. At this time, the liquid crystal plate 55 is not driven so that the polarization plane of the incident light is rotated, and therefore the light incident on the liquid crystal plate 55 is transmitted without the polarization plane being rotated, and the crystal plate 56 is transmitted as normal light. To Penetrate.

FIG. 5 shows a case where extraordinary light is obtained by driving the liquid crystal plate 55 so that incident light is rotated. As shown in FIG. The light of the image of the film 14 squeezed enters the liquid crystal plate 55. At this time, the liquid crystal plate 55 is driven so as to rotate the plane of polarization of the incident light by, for example, 90 degrees, and therefore, the light incident on the liquid crystal plate 55 has its plane of polarization rotated by 90 degrees, whereby the liquid crystal plate 55 is rotated. Is emitted as extraordinary light. The emitted extraordinary light is incident on the crystal plate 56, but since the incident light is extraordinary light, the optical axis is shifted by, for example, 1/2 pixel due to the birefringence of the crystal plate 56 and is transmitted. Therefore, this transmitted light is emitted from the CCD 5 shown in FIG.
The light will be incident on the pixel, not between the 7 pixels.

Next, referring to FIG. 6, the light of the image on the film 14 is taken as it is, or the optical axis thereof is shifted to 1/2, and the image is taken by the CCDs 23r, 25g and 27b, and the film 1 is taken.
The process of obtaining the image doubled in the horizontal direction from the image No. 4 will be described.

In FIG. 6, L1 / 2 represents the light of the image of the film whose optical axis is shifted to 1/2, and CCD represents the pixel data P1 obtained by photoelectric conversion of the CCDs 23r, 25g and 27b shown in FIG. , Pn, F1 is the pixel data of the frame memory 29 shown in FIG. 1, F2 is the pixel data of the frame memory 30 shown in FIG. 1, Vout is the final output, that is, of the film 14. Each data P1, P1 ', P2, P2', ... Pn, P of the image obtained by horizontally stretching the image twice
n '(not shown) is shown.

In FIG. 1, the CCDs 23r and 25g are used.
And 27b and three CCDs are used.
Therefore, although the frame memories 29 and 30 shown in FIG. 1 should be described as a total of six for R, G, and B, the frame memories 29 and 30 are replaced by the frame memories 29r, 30r, and 29g for convenience of description. And 30 g,
By considering that it is composed of 29b and 30b,
The description will be given assuming that the CCD 23r, 25g or 27b can be supported.

First, in a period in which the optical axis shift is not performed, the optical axis shift driving circuit 28b is controlled by the control signal from the CPU 34 to cause the optical axis shifter shown in FIGS. 2 and 3 (the optical axis shifter 28a in FIG. 1). ) Is controlled so as not to shift the optical axis of the light of the image on the film 14, and at this time, the light L1, L2, ... Of the image of the film 14 on which the optical axis indicated by the solid arrow in FIG. 6 is not shifted. Ln (not shown) is the CCD 23r, 25g and 27 shown in FIG.
b, respectively, and photoelectrically converted there to input F1 of the frame memory 29, that is, pixel data P1, P2,
... Pn (not shown) is supplied to the frame memory 29, respectively.

Next, in the period for shifting the optical axis,
Optical axis shift drive circuit 2 based on a control signal from the CPU 34
The optical axis shifter shown in FIGS. 2 and 3 (optical axis shifter 28a in FIG. 1) is controlled by 8b so as to shift the optical axis of the light of the image on the film 14 by 1/2 pitch. Sometimes, the light beams L1, L2, ..., Ln of the image on the film 14 whose optical axes are shifted as shown by the broken lines in FIG.
(Not shown) are respectively supplied to the CCDs 23r, 25g and 27b shown in FIG. 1, where they are photoelectrically converted and input F2 of the frame memory 30, that is, pixel data P1 ′,
Pn '(not shown) are supplied to the frame memory 30 respectively.

That is, the frame memory 29 stores the odd-numbered pixel data in the horizontal direction, and the frame memory 30 stores the even-numbered pixel data in the horizontal direction.
The data is read at a double speed, and is alternately switched and output with a signal having a sample frequency (for example, a sample clock or the like).

That is, the pixel data P1, P2, ... Pn are read from the frame memory 29, and the pixel data P1 ', P2', ... From the frame memory 30.
..Pn 'is read out, and these are alternately switched by the signal of the sampling frequency, and P1, P1', P2, P
Data arrays such as 2 '... Pn, Pn', that is, the video output Vout shown in FIG.

Next, referring to the timing chart shown in FIG. 7, the film 14 scraped off at, for example, 24 frames / sec.
A case where a video signal of 60 fields / second is obtained from the image will be described. In the following example, it is assumed that the outputs obtained by shifting the optical axes and the outputs obtained without shifting the optical axes are written in the frame memories 29 and 30, respectively.

In FIG. 6, t1 to t5 (assumed to be tn) are telecine conversion periods, T1 is the scraping timing of the film 14, T2 is the operation timing of the shutter 17, and T3 is the optical axis shift by the optical axis shifter 28a. , CCDout is the output of the CCDs 23r, 25g and 27b, T4 is the write and read timing of the frame memory 29, T5 is the write and read timing of the frame memory 30, and Vout is the video output.

Further, in the figure, c at the timing T2 indicates the closing of the shutter 17, o indicates the opening of the shutter 17, N at the timing T3 indicates that the optical axis is not displaced, S indicates that the optical axis is displaced, and O in the CCDout is. O indicates an even field output, E indicates an even field output, W at timings T4 and T5 indicates writing, R indicates reading, O in the video output Vout indicates an odd field output, and E indicates an even field output. Show.

Under the control of the CPU 34, the film drive circuit 37 intermittently scrapes off the film 14 at timing T1 in FIG. At the timing T1, the high level “1” period is the film scraping period. On the other hand, the shutter drive circuit 38 drives the shutter 17 under the control of the CPU 34. This drive timing is timing T2 in FIG. 6, and this timing T
2, the high level “1” indicates that the shutter 17 is closed, and the low level “0” indicates that the shutter 17 is open.

After the film 14 is scraped off, in the low level "0" period at the timing T1,
As can be seen from the timing T2, there are a period in which the shutter 17 is opened twice and a period in which the shutter 17 is opened three times.
This indicates that the telecine conversion is performed by the well-known method called 2-3 pulldown.

First, in the telecine conversion period t1,
The shutter 17 is opened twice by the shutter drive circuit 38 under the control of the CPU 23.
23r, 25g and 27b are exposed twice. In the first half of this period t1, the optical axis shift is not performed, and in the latter half, the optical axis shift drive circuit 28b drives the optical axis shifter 28a under the control of the CPU 34, and the optical axis is shifted by 1/2 pitch. .

Therefore, the CCDs 23r, 23g and 27b
The output CCDout of is the outputs O and E of the odd and even fields whose optical axes are not shifted, and the outputs O ′ and E ′ of the odd and even fields whose optical axes are shifted.

The outputs O, E, O'and E'are stored in the frame memory 29 shown in FIG.
It is written at the timing shown in FIG. Subsequently, in the telecine conversion period t2, the shutter 17 is opened three times by the shutter drive circuit 38 under the control of the CPU 23, whereby the CCDs 23r, 25g, and 27b are opened three times.
It is exposed twice. The optical axis shift is not performed in the first period of the period t2, and the optical axis shift is performed next. During this period, the output O of the odd field
(O + O ') is read twice.

Therefore, these outputs are sent to the frame memory 3
It is written in 0 at the timing indicated by the timing T5.
On the other hand, while the frame memory 30 is being written, as shown at a timing T4, the frame memory 2
Reading is performed from 9.

As a result, the video output Vout becomes outputs O and E stretched in the horizontal direction. Here, it is assumed that the output O shown as the video output Vout is composed of the outputs O and O'in the CCD output CCDout, and the output E shown in the video output Vout is composed of the outputs E and E'in the CCDout.

Next, in the telecine conversion period t3,
The shutter 17 is opened twice by the shutter drive circuit 38 under the control of the CPU 23.
23r, 25g and 27b are exposed twice. In the first half of the period t3, the optical axis shift drive circuit 28b drives the optical axis shifter 28a under the control of the CPU 34, and the optical axis is shifted by 1/2 pitch.

Therefore, the CCDs 23r, 23g and 27b
The output CCDout of is the outputs O ′ and E ′ of the odd and even fields whose optical axes are offset, and the outputs O and E of the odd and even fields whose optical axis is not offset.

These outputs O'and E ', O and E are written in the frame memory 29 shown in FIG. 1 at the timing T4. On the other hand, in this period, as shown at timing T5, the outputs O and E written in the frame memory 30 in the previous cycle,
O'and E'are read. Therefore, the video output Vou
As shown by t, outputs corresponding to the telecine conversion period t2, that is, outputs O, E and O stretched in the horizontal direction.
Is output.

Subsequently, in the telecine conversion period t4,
Under the control of the CPU 23, the shutter 17 is opened three times by the shutter drive circuit 38, and the optical axis is shifted in the first period of the period t4, whereby the CCDs 23r, 25g, and 27b are exposed three times and output. O'and E ', O and E, and O'and E'are obtained.

Therefore, among these outputs, the outputs O'and E ', O and E are sent to the frame memory 30 at the timing T5.
It is written at the timing shown by. On the other hand, while writing to the frame memory 30, the timing T
As shown in FIG. 4, reading is performed from the frame memory 29. As a result, the video output Vout becomes the outputs E and O stretched in the horizontal direction.

Subsequently, in the telecine conversion period t5,
The shutter 17 is opened twice by the shutter drive circuit 38 under the control of the CPU 23, and the optical axis shift is not performed in the first period of the period t5, and the optical axis shift is performed after this period.
r, 25g and 27b are exposed twice and outputs O and E,
O'and E'are obtained.

These outputs O and E, O'and E'are written in the frame memory 29 shown in FIG. 1 at timing T4. On the other hand, as shown at the timing T5, the C written from the frame memory 30 before that is written.
Outputs O'and E ', O and E from the CDs 23r, 25g and 27b are read out and output as a video output Vout corresponding to the telecine conversion period t4, that is, outputs E, O and E. During this period, the output E (E + E ') of the even field is read twice. After that, the film 1 is sequentially processed by the 2-3 pull-down method as described above.
The image of No. 4 is picked up and taken out as a video signal.

When the processing is performed as described above, CC
The frame frequency of D23r, 25g, and 27b is double that of the conventional one, but as described above, the CCD 23r, 25g
Since only 1/2 of the image pickup surface of 27 and 27b needs to be used, the number of pixels in one line is 1/2, and therefore the driving frequency is the same as the conventional one.

Further, it is assumed that the reading is frame reading as described above, and the exposure timing does not cross the sensor gates of the odd and even fields. Further, in the above-mentioned case, the case where the video signal is obtained from the image compressed in half in the horizontal direction has been described. However, when the video signal is obtained by capturing the image of the cinemascope size, of course, C
The use range of the imaging surfaces of the CDs 23r, 25g, and 27b is the entire range.

Here, with reference to FIG. 8, an explanation will be given with reference to an example of processing in the case where an image of the compressed film 14 is electronically expanded by shifting by 1/2 pixel to obtain an image of a cinemascope size or the like. .

First, as shown in step S1, odd-numbered field output, that is, pixel data O is written in the frame memories 29 and 30 shown in FIG. 1, and then even-numbered field output, as shown in step S2. That is, the pixel data E is written.

In step S2, the pixel data is interpolated later by one pixel data in the horizontal direction (interpolated with pixel data O'and E'of odd and even fields obtained by shifting by 1/2 pixel). O
And O are considered to be vacant by one pixel, and pixel data E are also considered to be vacant by one pixel.

In step S3, pixel data O'obtained by shifting by 1/2 pixel is given to the vacant portion shown in step S2 and the position corresponding to the odd field, and further, in step S4, it is shown in step S2. Pixel data E'obtained by shifting by 1/2 pixel is given to each of the empty portions and the positions corresponding to the even fields.

Therefore, as shown in step S4, 1 /
An image having twice the number of pixels in the horizontal direction can be obtained with respect to the image obtained without shifting the two pixels. Each pixel data of the image thus obtained is sequentially output in the order of odd lines and even lines, as shown in step S5.

As described above, in this example, the image compressed to 1/2 in the horizontal direction is transferred to the CCDs 23r, 25g and 2
When the image signal is obtained by capturing with 7b, the outputs O and E of the CCDs 23r, 25g, and 27b when the optical axis of the light of the compressed image is not shifted are obtained, and these outputs O and E are stored in the frame memory 29. CCD 23r, 25g, and 27b when the optical axis of the light of the written and compressed image is shifted
Outputs O'and E'of the frame memory 30
And read from the frame memories 29 and 30 at 1/2 speed of writing, respectively, and output O or E from the frame memory 29 and output O ′ or E ′ from the frame memory 30 in each field.
Are output alternately and used as a video signal, so without using an expensive lens such as an anamorphic lens, image distortion caused by using an anamorphic lens is prevented, and a good video signal is obtained. be able to.

Further, in the present example, it is 1/2 in the horizontal direction.
When the images compressed by the CCD 23r, 25g and 27b are imaged and the telecine conversion is performed, the outputs O and E of the CCDs 23r, 25g and 27b when the optical axis of the light of the compressed image is not shifted, and the compressed images are compressed. The outputs O'and E'of the CCDs 23r, 25g, and 27b when the optical axes of the light of the image are shifted are obtained, these are written in the frame memories 29 and 30, and read from the frame memories 29 and 30, respectively. Therefore, it is possible to obtain a good video signal without using an expensive lens such as an anamorphic lens and preventing image distortion caused by using the anamorphic lens.

The above embodiment is an example of the present invention.
It goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0084]

According to the present invention described above, the light of the image on the film is at least optically set to one of the minimum image pickup units of the CCD.
/ 2 pitches are selected by the selecting means, and at least one image is stored based on the output from the CCD when the light of the image on the film is optically shifted by the selecting means and when the light is not shifted. Since it is stored in, and the storage operation of the storage means is controlled by the control means, without using an expensive lens such as an anamorphic lens, the image distortion caused by using the anamorphic lens is prevented, A good video signal can be obtained.

Further, according to the present invention described above, the optical axis shift control means controls whether or not the optical axis shift is performed with respect to the optical axis shift means that shifts the light of the image on the film by 1/2 pitch. Since it did so, in addition to the above-mentioned effect, one image data can be satisfactorily obtained.

Further, according to the present invention described above, at least the optical system capable of displacing the optical axis of the light of the image on the film is mechanically or electrically driven by the driving means. In addition, the configuration of the device can be simple and inexpensive.

Further, according to the present invention described above, the position on the optical axis is changed by driving the glass plate by the driving means to shift the optical axis of the light of the image on the film. In addition, the configuration of the device is simple,
In addition, the cost can be reduced.

Further, according to the present invention described above, the polarization plane of the light of the image on the film is narrowed down to one row by the deflecting plate, and the light having the polarization plane in this one direction is irradiated to the liquid crystal panel, and By driving, the polarization plane of the light incident on the liquid crystal plate is changed at least every CCD reading cycle to obtain normal light or abnormal light, and the normal light or abnormal light is incident on the crystal plate, and the normal light Since the optical axis of the extraordinary light is shifted with respect to the axis, in addition to the above-mentioned effect, there is no mechanical control, so the precision of pixel shifting is further increased,
It is possible to obtain better image data.

Further, according to the present invention described above, the output of the CCD obtained by optically shifting by 1/2 pitch is written in one frame memory, and the output of the CCD obtained by not optically shifting by 1/2 pitch is obtained. Since the video signal for one screen is obtained by writing to the other frame memory and alternately reading from the one and the other frame memories in sample units, in addition to the above effects, the configuration of the device can be simplified. At the same time, the cost can be reduced.

Further, according to the present invention described above, the output of the CCD obtained by optically shifting by 1/2 pitch and the output of the CCD obtained by not optically shifting by 1/2 pitch are alternated every time the film is scraped. In addition to writing to the frame memory, the output of the CCD written in the frame memory is alternately read every time the film is scraped off to obtain a video signal. Therefore, in addition to the above-mentioned effects, a simple and inexpensive structure is provided. Telecine processing can be performed well.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a telecine device of the present invention.

FIG. 2 is a configuration diagram showing an example of a main part of an embodiment of a telecine device of the present invention.

FIG. 3 is a configuration diagram showing an example of a main part of an embodiment of a telecine device of the present invention.

FIG. 4 is an explanatory diagram for explaining the principle of 1/2 pixel shift, which is used for describing an embodiment of the telecine device of the present invention.

FIG. 5 is an explanatory diagram for explaining the principle of 1/2 pixel shift, which is used for describing an embodiment of the telecine device of the present invention.

FIG. 6 is an explanatory diagram for explaining a flow of processing of pixel data obtained by ½ pixel shift, which is used for explaining an embodiment of the telecine device of the present invention.

FIG. 7 is a timing chart for explaining an embodiment of the telecine device of the present invention.

FIG. 8 is an explanatory diagram for explaining an example of reading pixel data for explaining an embodiment of the telecine apparatus of the present invention.

FIG. 9 is a configuration diagram showing an example of a conventional telecine device.

[Explanation of symbols]

 23r, 25g, 27b, 53, 57 CCD 28a Optical axis shifter 28b Optical axis shift drive circuit 29, 30 Frame memory 34 CPU 40 Write / read control circuit 51 Drive device 52 Glass plate 54 Deflection plate 55 Liquid crystal plate 56 Quartz plate

Claims (7)

[Claims] 1. A telecine device adapted to obtain a video signal by capturing an image of a film with a CCD, wherein the light of the image of the film is at least optically converted to the CC.
Selection means for selecting whether or not to shift by 1/2 pitch of the minimum image pickup unit of D, and output from the CCD when the light of the image of the film is optically shifted by the selection means and when it is not shifted. A telecine device comprising: a storage unit for obtaining at least one image based on the above; and a control unit for controlling at least the storage operation of the storage unit. 2. The selection means controls at least an optical axis shift means for shifting the light of the image on the film by 1/2 pitch, and controls whether or not the optical axis shift means performs the optical axis shift. The telecine device according to claim 1, wherein the telecine device comprises an optical axis shift control means for performing the shift. 3. The optical axis shifting means is composed of at least an optical system capable of shifting the optical axis of the light of the image on the film, and a driving means for mechanically or electrically driving the optical system. The telecine device according to claim 2, wherein: 4. A glass plate is used as the optical system, and the glass plate is driven by the driving means to change the position on the optical axis to shift the optical axis of the light of the image of the film. The telecine device according to claim 3, wherein 5. A polarizing plate, a liquid crystal plate, and a quartz plate are used as the optical system, and the polarization plane of the light of the image of the film is narrowed down to one row by the polarizing plate. By irradiating the liquid crystal plate and driving the liquid crystal plate, the plane of polarization of the light incident on the liquid crystal plate is changed at least every reading cycle of the CCD to obtain normal light or abnormal light. 4. The telecine device according to claim 3, wherein abnormal light is incident on the crystal plate to shift the optical axis of the abnormal light with respect to the optical axis of the normal light. 6. At least one C as the storage means
Two frame memories are provided for the CD, and the output of the CCD obtained by optically shifting by 1/2 pitch is written into one frame memory, and the output of the CCD obtained without optically shifting by 1/2 pitch. 2. The telecine device according to claim 1, wherein a video signal for one screen is obtained by writing the data into the other frame memory and reading from the one and the other frame memories alternately on a sample-by-sample basis. 7. At least one C as the storage means
Two frame memories are provided for the CD, and the output of the CCD obtained by optically shifting by 1/2 pitch and the CCD obtained by not optically shifting by 1/2 pitch
Output is alternately written to the frame memory each time the film is scraped, and the output of the CCD written to the frame memory is alternately read every time the film is scraped to obtain a video signal. The telecine device according to claim 1.