JPH02295366A - Image pickup/reproducing system - Google Patents

Abstract

PURPOSE:To improve resolution by arranging the picture element of another charge coupling element (CCD) in an intermediate position in addition to the horizontal and vertical positions of picture elements in one CCD and making a display system corresponding to an image pickup system. CONSTITUTION:When an picture element interval between CCDs 4 and 5 is defined as X, for the optical arrangement of the CCDs 4 and 5, the difference of position X/2 is horizontally provided and the difference of position Y/2 is vertically provided. The CCD 4 is driven by a clock oscillator 6 (frequency fc) and connected to an (a) terminal of an electronic switcher 9. The output of the clock oscillator 6 is displaced by tau/2(tau=1/fc) in a tau/2 delay device 7 and the CCD 5 is driven by such a clock. For a CRT 14, an wobbling coil 15 is used for deflection in a vertical direction and the CRT 14 is driven by an wobbling drive signal 16 of cos2pifct. Then, on the screen of the CRT, a scanning line is displaced in the vertical direction for Y/2 in the CCD. Thus, a high fidelity picture can be obtained by using a monochromatic CCD which is presently used.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a charge-coupled device (hereinafter referred to as COD).
It is abbreviated as ) relates to an imaging/reproduction system that uses an imaging device consisting of [Summary of the invention] Two CCDs with a small number of pixels are arranged at a pixel interval of 1/2 of X.
horizontally and vertically displaced by . For example, the light beam exiting the imaging lens is divided into two by a half mirror, and the CCD is arranged in the above relationship with respect to the light beam. Scanning of two CCDs is done with one as a reference and the other as X/2.
Scan by shifting the Display the image as follows using the output. (1) The output of cco is expressed as 2fC (fC; CC
D clock frequency), and at the same time the display system, the cathode ray tube (hereinafter referred to as CR).
It is abbreviated as T. ) is wobbling with fC, and one COD is displayed on the screen.
The scanning position of the output of the other CCD should be in the middle of the scanning line of the other CCD. A CRT with short afterglow is used. (2) The outputs of the two CCDs in (1) are switched in vertical synchronization units or frame unit pulses and displayed on a CRT with long afterglow. and add additional pulses to the vertical deflection so that the scan of the output of one COD is intermediate between the scan lines of one COD.

(3) Set the scanning clock frequency of the two CODs to 2f
C, one line of one COD is scanned at twice the frequency, and then one line of the other COD is scanned. The outputs of both CODs are added together and supplied to the display system CRT.
The horizontal deflection is set to a frequency of 2fH, which is twice the normal frequency.

[Prior art] In an image sensor with a fixed number of pixels, such as a COD,
Its spatial resolution is determined by the number of pixels. Therefore, in order to capture images with 7rE definition, it is necessary to develop elements such as CCDs with a large number of pixels. [Problems to be solved by the invention] Such devices have the disadvantage of being relatively expensive because they are developed separately from the devices that are currently widely used. Also, C
As the density of OD pixels increases, the manufacturing technology also requires advanced technology, and the yield tends to decrease. [Object of the invention] The object of the invention is. Monochrome CC used for Ilt
The purpose of the present invention is to provide an imaging/reproduction system that makes it possible to obtain high-definition images using D. First imaging according to the present invention/
The playback system consists of an image pickup device consisting of two CCDs, a means for shifting the output of one of them by X/2 in the horizontal and vertical directions with respect to the output of the other, and a short afterglow type. A cathode ray tube and the above two COs
D output is alternately selected at 2fC and supplied to the short afterglow type cathode ray tube, and the vertical deflection of the cathode ray tube is set to f0.
The gist is to include means for wobbling. A second invention according to the present invention includes an image pickup device consisting of two CCDs, and a means for shifting the output of one of them by X/2 in the horizontal and vertical directions with respect to the output of the other, with the pixel interval of the COD being different. And, afterglow type cathode ray tube,
It consists of a means for switching the above two CCD outputs in units of vertical synchronization or in units of frames and supplying them to the above long afterglow cathode ray tube. Furthermore, a third invention according to the present invention is a method for converting an image into a first COD.
means for forming an image on a second CCD; means for scanning the first COD and the second CCD alternately line by line at 2fC to obtain two COD outputs; and means for alternately selecting the two CCD outputs and supplying them to a CRT having a horizontal deflection frequency of 2fH.
[Operation] FIG. 2 shows an equivalent pixel arrangement according to the present invention.

The pixel spacing is X in the horizontal direction and Y in the vertical direction, and as in the conventional case, if there are only pixels shown by solid lines, the effective area used for photoelectric conversion of the pixels is a2XY (aperture ratio a2) on the COD surface. The spatial frequency at is f = 1/2X
It is clear from the sampling theorem that up to the maximum amount of time is reproduced on the display device as a video signal.

As can be seen from FIG. 2, according to the present invention. (1), (
Between the pixels 2), (3)..., that is, X/2 horizontally and Y/2 vertically with respect to the pixel (1)
By placing (1') at a shifted position, it is possible to reproduce up to twice the overall spatial frequency, f = 1/X.

[Examples] The present invention will be explained in more detail below using examples with reference to the drawings, but these are merely illustrative and various modifications and improvements can be made without going beyond the scope of the present invention. Of course it is possible.

Figure 1 is an example of a system diagram in which wobbling is used in a CRT. In the figure, 1 is an imaging lens, 2 is a half mirror, 3 is a reflecting mirror, 4 and 5 are CODs, and 6 is a clock oscillator (fC). , 7 is τ/2 delay device, 8 is 2f
C generator, 9 is electronic switcher, 10 is horizontal synchronization (
HD). 11 is COD 4 drive signal, 12 is τ/2
Delay unit 13 represents a CCD 5 drive signal, 14 represents a display monitor (CRT), 15 represents a wobbling coil (deflection), and 16 represents a wobbling drive signal.

The operation of the above embodiment will be explained below. The light passing through the imaging lens 1 is a half mirror (semi-transparent mirror)
2 is imaged on CCD 4 , and the transmitted light from half mirror 2 is imaged on CCD 5 by reflecting mirror 3 .
In order to equalize the amount of incident light on the CODs 4 and 5, the amount of light transmitted through the half mirror 2 and the amount of incident light are made equal.

Also, in Figure 1, due to the principle of the configuration, an image of COD 4.5 and one reflection is formed on the COD, but if the reflection is made an even number of times, the image of the COD is directly formed by lens 1. The result is a normal image with the left-right relationship equal to that of the left-right image (in the case of Figure 1, it is a left-right inverted image). The optical arrangement of CCDs 4 and 5 is x/2 horizontally and Y vertically as shown in Figure 2.
/2 position difference. CCD 4 is driven by clock oscillator 6 (frequency fC) and connected to terminal a of electronic switcher 9. The output of the clock oscillator 6 is converted to τ/2 (
τ = 1 / f c ) CC with the displaced clock
Drive D5. That is, CCD 5
The output of CCD 4 generates a signal delayed by τ/2. The output of CCD 5 is connected to electronic switcher 9.
Connect to the b terminal. The electronic switcher 9 switches the outputs of the CCDs 4 and 5 by a 2fC multiplier circuit 8 driven by the fC of the clock oscillator 6, and changes the outputs of the CCDs 4 and 5 by C every τ/2.
Supply to RT14. The CRT 14 uses a wobbling coil 15 for vertical deflection, and the cos
It is driven by a wobbling drive signal 16 of 2πfCt to vertically displace the scanning line by Y/2 in COD on the CRT screen. Figure 1 (7) HDIO is a case where COD 4.5 is driven by HD, and CCD 4 is driven by HD direct output 11.
The CCD 5 is driven by the output 13 delayed by τ/2 by the τ/2 delay device 12.

FIG. 3 shows the output signal of the electronic switcher 9, where the solid line is the output of the CCD 4 and the broken line is the output of the CCD 5. It consists of a time series with an interval τ/2. The signal shown in FIG. 3 becomes the screen shown in FIG. 4 on the screen of the CRT 14 by driving fC of the wobbling drive signal 16. (1), (2), (3), (4) when not wobbling
) becomes the scanning line (1) due to wobbling. (1
'), (2), (2')... It becomes a meandering line, (1'), (2'). (3') is exactly in the middle of the two scanning lines. Since the display in Figure 4 corresponds to the CCD arrangement in Figure 2, the resolution is twice that of the original COD both horizontally and vertically. FIG. 5 is a block diagram showing the configuration of another embodiment of the present invention, in which reference numbers common to those in FIG. 1 represent the same or corresponding parts as in FIG. 17 is an electronic switch (clock supply switching), 18 is a τ/4 delay device, 19 is a 2f
u generator, 20 represents a horizontal deflection circuit. The point that the optical image is separated by the half mirror 2 and focused on the COD 4.5 is the same as in Fig. 1. In FIG. 5, CCDs 4 and 5 are driven by a 2fC clock and are alternately switched at H/2 (H: one line length of normal scanning). That is, 2fC generator 8
The 2fC clock signal is obtained by the electronic switch 17 from the HDIO and the 2fu generation circuit 19.
/2 period switching pulse H/2 period p CCD
Drives 4 and 5. Note that CCD 5 uses a τ/4 delay circuit 18 to start driving τ/4 later than CCD 4. electronic switcher 9
Also, switching is done in H/2 units, and CRT 14
However, the horizontal scanning frequency of the CRT 14 is 2fH. That is, CCD 4 is 1
The line is scanned at H/2, then the CCD 5 is scanned at H/2, and the CRT also corresponds to the COD output. FIG. 6(a) shows a signal of normal scanning (CCD), and FIG. 6(b) shows the case of FIG. 5 in which one line is scanned at H/2. Figure 7 is a reproduction on the CRT screen, (1)
, (2), (3), etc., and the outputs of the CCD4 (1'), (2'). (3')・・・・・・・・・
The outputs of the CCDs 5 are arranged alternately in the vertical direction. Figure 8 is a block diagram showing the configuration of an imaging/playback system using a long-time afterglow CRT.
(Vertical synchronous dual frequency fv). 22.23 is a flip-flop, 24 is a switch pulse selection switch, 25
represents a vertical deflection adder, and 26 represents a vertical deflection sawtooth wave.

The inputs a and b of the electronic switcher 9 are the same as those shown in FIG. 1, and are scanned at the clock frequency fC of the clock oscillator 6, and the electronic switcher 9 alternately switches the outputs of a and b. Period 2/f with flip-flop 22
generate a switch pulse of v, select it with the switch 24,
Drive electronic switcher 9. The output of the switch 24 is added to the vertical deflection sawtooth wave 26 by a vertical deflection adder 25 to deflect and scan the CRT 14. Switch 24 adds Y/2 of COD on the screen.
is the deflection voltage of the displacement corresponding to . This is fine for sequential scanning. In the case of interlaced scanning, the output of the flip-flop 23 (cycle 4
/ f v ). The CRT screen has the same scanning pattern as shown in Figure 7. The optical system also includes relay lenses 27 and 28 as shown in Figure 9.
Set up. A reflective optical path may be provided between them, or a 10th
As shown in the figure, the transmitted light of half mirror 2 is captured by CCD 5.
The reflected light from the half mirror 2 may be reflected by the reflecting mirror 3 and input to the CCD 4. FIG. 10 has the advantage that image reversal does not occur.

[Effect of the invention] There are other CODs in the middle both horizontally and vertically of one COD pixel.
D pixels are arranged, and the display system is compatible with the imaging system, so the resolution is improved. (1), (2), and (3) mentioned in the section of the summary of the invention depend on the characteristics of the display system used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a first imaging/playback system (wobbling display) according to the present invention, and FIG.
FIG. 3 is a diagram showing the signal sequence of the electronic switcher in the device shown in FIG. 1, FIG. 4 is an explanatory diagram of display by wobbling, and FIG. A block diagram showing the configuration of the second imaging/playback system (using standard afterglow CRT), Figure 6 is
An explanatory diagram of signal generation of two CODs in the device shown in the figure,
FIG. 7 is a diagram showing the display screen of the CRT in the apparatus shown in FIG. The figure is a layout diagram of an optical system using a relay lens.
Figure 0 is another arrangement diagram of the half mirror and the reflecting mirror. 1...Imaging lens, 2...
・Half mirror 3・・・・・・Reflector, 4, 5・
・・・・・・・・・CCD, 6・・・・・・・・・Clock oscillator (fC), 7・・・・・・τ/2 delay device, 8・・・・・・・・・... 2fC generator, 9...
...Electronic switcher, 10...
Horizontal synchronization (HD). 11・・・・・・CCD 4
Drive signal, 12...... τ/2 delay device,
13......CCD 5 drive signal, 14
・・・・・・Display monitor (CRT). 15...
...Wobbling coil (deflection), 16...
...Wobbling drive signal, 17...
...Electronic switch (clock supply switching), 18...
...... τ/4 delay device, 19...
・2fH generator. 20......Horizontal deflection circuit, 21...VD (vertical synchronous dual frequency fv), 22.23...Flip-flop, 24... ......Switch pulse selection switch, 25...Vertical deflection adder, 26.
・・・・・・Vertical polarization sawtooth wave, 27, 28...
...Relay lens. Patent applicant Clarion Co., Ltd.

Claims (3)

[Claims] (1) An imaging device consisting of two charge-coupled devices, a means for shifting the output of one of the charge-coupled devices by X/2 in the horizontal and vertical directions relative to the output of the other, where the pixel interval of the charge-coupled devices is X, and a short residual. An imaging device characterized by comprising: a light-type cathode ray tube; and means for alternately selecting the two charge-coupled device outputs at 2f_C and supplying the short-afterglow type cathode ray tube to the short-afterglow type cathode ray tube, and wobbling the vertical deflection of the cathode ray tube at f_C. /Reproduction system. (2) An imaging device consisting of two charge-coupled devices, a means for shifting the output of one of the charge-coupled devices by X/2 in the horizontal and vertical directions with respect to the output of the other, where the pixel interval of the charge-coupled devices is X; An imaging/reproduction system comprising: an optical cathode ray tube; and means for switching the outputs of the two charge-coupled devices in units of vertical synchronization or in units of frames and supplying the same to the long afterglow cathode ray tube. (3) means for forming an image on a first charge-coupled device; means for forming the image on a second charge-coupled device; and alternating the first charge-coupled device and the second charge-coupled device line by line. to 2
means for scanning at f_C and obtaining two charge-coupled device outputs;
and means for alternately selecting the two charge-coupled device outputs and supplying them to a cathode ray tube having a horizontal deflection frequency of 2f_H.