JPS6238390Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a color video signal imaging device, and in particular, by arbitrarily shifting the phase of a color burst signal and the phase of a luminance signal by a desired value, the original color can be obtained. To provide an imaging device capable of transmitting and outputting a color video signal having a different brightness and hue in place of the original color video signal, thereby obtaining a color video signal with various special effects applied to the video signal. The purpose is to

Conventional technology and its problems Conventionally, the color signal ( A so-called positive image is obtained by inverting the hue (hue) and luminance signal (brightness). For example, a device for reversing color negative film to a positive image and reproducing it on a color television picture tube was proposed in Japanese Patent Application No. 50-28081.
103727) has been proposed.

However, since this method performs polarity reversal at the stage of the composite color video signal, the color signal becomes a carrier color signal with a band, so it is affected by the transmission characteristics and is particularly sensitive to color signals. Since an (equivalent) delay circuit is included in the transmission path, a phase shift between the luminance signal and the color signal occurs. Therefore, there is a problem in that an adjustment circuit or the like (device) must be newly provided to eliminate this phase shift.

Means for Solving the Problems Therefore, in order to solve the problems of the conventional technology, the present invention photoelectrically converts the light from the object to be imaged and performs predetermined processing to convert the brightness obtained. In a color video signal imaging device that outputs a color video signal by transmitting a signal and a carrier color signal together with a composite synchronization signal and a color burst signal, a phase shift circuit that shifts the phase of the color burst signal by an angle of 180° and its vicinity; an inversion circuit that inverts the polarity of the luminance signal excluding the composite synchronization signal with respect to the original polarity; and either the color burst signal to be transmitted or the color burst signal whose phase has been shifted by the phase shift circuit is transmitted. a first changeover switch configured to transmit the brightness signal excluding the composite synchronization signal to be transmitted, and a second changeover switch configured to transmit either the brightness signal excluding the composite synchronization signal to be transmitted or the output polarity inverted brightness signal of the inversion circuit. and a color burst signal phase-shifted by the phase shift circuit and an output polarity inversion of the inversion circuit in place of either or both of the color burst signal to be transmitted and the luminance signal excluding the composite synchronization signal. The present invention provides a color video signal imaging device characterized in that it can be arbitrarily switched to transmit and output either or both of the luminance signals together with the carrier color signal and the composite synchronization signal.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows a block system diagram of an embodiment of a color video signal imaging apparatus according to the present invention, and particularly shows a block system diagram of a separated brightness dual-tube color television camera as an embodiment.

As described later, this embodiment of the device transmits and outputs the original color video signal containing the color information of the subject as it is (hereinafter referred to as normal mode), and when transmitting and outputting the original color video signal in place of the original color video signal. There is a case where a color video signal obtained by inverting the color burst signal and the luminance signal and then combining them is switched, transmitted, and output (hereinafter, this case is referred to as an inversion mode).

First, in the normal mode, the first and second changeover switches 14 and 27 are connected to the contacts 14a and 27, respectively.
It is connected in conjunction with a. Light from the object to be imaged passes through an optical processing system such as a camera lens, a prism, and a color stripe filter (none of which are shown), and then reaches the photoelectric conversion surface of each of the color signal image pickup tube 1 and the luminance signal image pickup tube 22. It is incident on and forms an image. The output signals of the color signal image pickup tube 1 are processed by a color stripe filter or the like (not shown) placed in front of the image pickup tube 1. Signal B exists as a low frequency component, and red signal R due to red light and blue signal B due to blue light each have different carrier frequencies.
This is a frequency-multiplexed color signal that exists as high-frequency components with _R and _B. After being amplified by a preamplifier 2, this color signal is supplied to a low-pass filter 3 and bandpass filters 4 and 5, respectively. .

The low frequency components extracted by the low frequency filter 3 are supplied to the matrix circuit 6. band filter 4
The high-frequency component of the carrier frequency _R extracted by is supplied to a detector 7, where it is detected and a red signal R is extracted and supplied to a matrix circuit 6 and an RGB process circuit 9, respectively. Further, the high-frequency component of the carrier frequency _B extracted by the band filter 5 is supplied to the detector 8, where it is detected and the blue signal B is extracted, and the matrix circuit 6 and the RGB
It is supplied to the process circuit 9.

The above matrix circuit 6 subtracts the red and blue signals corresponding to 1/2R and 1/2B from the detectors 7 and 8 from the low-frequency components from the low-pass filter 3, extracts only the green signal G, and processes the RGB process. Supplied to circuit 9. RGB process circuit 9 is RGB gamma circuit 1
At the same time, the three primary color signals G, R, and B from the matrix circuit 6 and the detectors 7 and 8 are matrixed to output two color difference signals R-Y and B-Y. Among these, the color difference signal (RY) is waveform-shaped and amplified by a waveform shaper 11 and then supplied to a mixer 12 .

On the other hand, a burst flag, which is, for example, a negative pulse, synchronized with the back porch portion of the horizontal synchronizing signal with a pulse width corresponding to the color burst signal period is extracted from the burst flag generator 13 and sent to the mixer 12 through the changeover switch 14. Supplied. As a result, a signal in which the color difference signal (R-Y) and the burst flag are synthesized in time series is extracted from the mixer 12, and this synthesized signal is supplied as a modulation signal to the balanced modulator 17, where it is
The 3.58MHz carrier wave from the 3.58MHz oscillator 16 is balanced-modulated.

The other color difference signal (B-Y) taken out from the RGB process circuit 9 is sent to the waveform shaping amplifier 18.
After the waveform is shaped and amplified by the balanced modulator 20
supplied to This balanced modulator 20 has 3.58M
Since the 3.58 MHz continuous wave output from the Hz oscillator 16 is delayed in phase by 90 degrees by the 90 degrees phase shifter 19 and is supplied as a carrier wave, the balanced modulator 20 outputs the color difference signal (B-Y). A carrier suppression amplitude modulation signal obtained by balanced modulation of a 3.58 MHz carrier wave is extracted. The carrier suppression amplitude modulation signal obtained by balanced modulation of the 3.58 MHz carrier by the color difference signal (R-Y) from the balanced modulator 17 above and the phase between the burst and flag signal periods shown in FIG.
A time-series composite signal with a 3.58MHz color burst signal aligned with the (B-Y) axis is extracted, and this composite signal and the amplitude modulation signal from the balanced modulator 20 are mixed in a mixer 21, respectively. be done. As a result, the color difference signal (R-
A time-series composite signal of a color burst signal and a carrier color signal having a color subcarrier frequency of 3.58 MHz that has been subjected to quadrature two-phase modulation at Y) and (B-Y) is extracted.

Note that FIG. 2 is a well-known vector diagram showing the relationship between the color burst signal phase (corresponding to the -(BY) axis) of an NTSC color video signal and the phase and saturation of each hue.

On the other hand, the output luminance signal of the luminance signal image pickup tube 22 is amplified by a preamplifier 23, then waveform-shaped and amplified by a waveform shaping amplifier 24, and then further supplied to a luminance signal processing circuit 25, where Y
Gamma correction is performed using the output of the gamma circuit 26. The brightness signal taken out from the brightness signal processing circuit 25 is sent to the changeover switch 2 connected to the contact 27a.
7 to a mixer 29 where the quadrature two-phase modulated carrier color signal and color burst signal from the mixer 21 and the synchronization signal generator 28
After being band-sharing multiplexed with a synchronization signal from each other to form a color video signal, the color video signal is outputted from an output terminal 31 via an output amplifier 30.

The above is the operation in normal mode, and color video signals are transmitted and output as a general color television camera.

Next, the operation in the reversal mode, which is the main part of the device of the present invention, will be explained.
b side, respectively. This allows burst
The burst flag from the flag generator 13 is supplied to the inversion circuit 15 by switching the changeover switch 14, where the polarity is inverted (180° phase shifted) and then supplied to the mixer 12. Therefore, in this mixer 12, the waveform shaping amplifier 11 obtained by performing the same signal processing as in the above normal mode.
The burst flag mixed with the second color difference signal (R-Y) has its polarity inverted in the inversion mode.

The output composite signal of the mixer 12 is sent to the balanced modulator 1.
The amplitude modulated wave whose modulation signal is the color difference signal (R-Y) whose 3.58 MHz carrier wave is suppressed by being balanced modulated and the burst flag whose polarity is inverted, exists during that period and has a phase difference. is extracted as a time-series composite signal with a 3.58 MHz color burst signal that differs by 180 degrees from the normal mode. Therefore, the color burst signal of the composite signal output from the balanced modulator 17 in this inversion mode is as shown at 34 in FIG.
This means that the phase is shifted to the same phase as the Y) axis. Therefore, the conveyed color signal from the mixer 21 is
By reversing the polarity of the color burst signal, it becomes a carrier color signal whose hue is complementary to the primary color.

On the other hand, by switching the changeover switch 27 to the contact 27b, the luminance signal obtained by the same operation as in the normal mode is transferred to the luminance signal processing circuit 27.
5 to the clamp circuit 32. Now _, as _shown in FIG.
Assuming that the waveform is composed of a ₂ and a ₄ , the horizontal blanking portions a ₁ and a ₃ are separated by the clamp circuit 25.
is clamped to the white level and extracted as a luminance signal with a waveform as shown in FIG. Here, in FIG. B, b ₁ and b ₃ indicate horizontal blanking sections clamped to the white level, and b ₂ and b ₄ indicate video signal sections.

The luminance signal having the waveform shown in FIG. 3B taken out from the clamp circuit 32 is supplied to the inverting circuit 33, where its polarity is inverted by, for example, a transistor, and at the same time, the horizontal blanking section is clamped to the pedestal level. Then, a polarity-inverted luminance signal having a waveform as shown in FIG.
Note that, in C of the same figure, c ₁ and c ₃ indicate horizontal blanking sections clamped to the pedestal level, and c ₂ and c ₄ indicate video signal sections whose polarities have been inverted. This inversion circuit 33
The polarity-inverted luminance signal having the waveform shown in FIG.
Here, the carrier color signal and polarity-inverted color burst signal from the mixer 21 described above and the composite synchronization signal from the synchronization signal generator 28 are multiplexed, respectively. Therefore, the output signal of the mixer 29 is converted into a color video signal having a waveform as shown in FIG. In Fig. 3D, d ₁ and d ₄ are horizontal synchronizing signals, d ₂ and d ₅ are polarity inverted color burst signals, and d ₃ and d ₆ are band sharing multiplexed carrier color signals and polarity signals. The video signal portions of the inverted luminance signal are shown respectively.

In this way, by using the above-mentioned inversion mode, it is possible to obtain a color video signal that is complementary to the color of the subject and whose brightness is the exact opposite of that of the subject. It is possible to obtain a color image with the same hue and brightness as the original subject of the color negative film. In addition, even when forming captions, which was conventionally done by writing white letters on a black mount, by using the above-mentioned inversion mode, it is easier to create captions such as writing black letters on a white mount and other types of captions. It is possible to create color images with other special effects.

In addition, in the above embodiment, the changeover switches 14, 2
7 are interlocked to simultaneously invert the polarity of the color burst signal and the luminance signal, but these switches are made independent of each other to selectively invert the polarity of only one of them. Also good. In addition, although this embodiment has been explained using a separated luminance two-tube color television camera based on the NTSC system, it can also be implemented in the same way for a PAL system, and it can also be implemented using a single-tube type, three-tube type, or a solid-state color television camera. Of course, it can also be implemented as a color television camera using an imaging plate (such as a CCD).

Furthermore, in the above embodiment, the color burst signal is
Although the phase shift is 180°, even a phase shift of around 180° can be corrected by taint correction on the monitor receiver side, so it is included in the device of the present invention.

Effects of the Invention As described above, the color video signal imaging device of the present invention photoelectrically converts light from an object to be imaged, performs predetermined processing, and converts the obtained luminance signal and carrier color signal into a composite synchronization signal and a color signal. In a color video signal imaging device that outputs a color video signal by transmitting it together with a burst signal, a phase shift circuit that shifts the phase of the color burst signal by an angle of 180° and its vicinity, and a polarity of the luminance signal excluding the composite synchronization signal. an inverting circuit that inverts the original polarity of the color burst signal relative to the original polarity; and a first changeover switch that switches the color burst signal to be transmitted or the color burst signal whose phase has been shifted by the phase shift circuit to be transmitted. , a second changeover switch configured to transmit either the luminance signal excluding the composite synchronization signal to be transmitted or the polarity-inverted luminance signal output from the inverting circuit; Either or both of the color burst signal whose phase is shifted by the phase shift circuit and the output polarity inverted luminance signal of the inverting circuit is used in place of either or both of the signal and the luminance signal excluding the composite synchronization signal. Since it can be arbitrarily switched to be transmitted and output together with the carrier color signal and the composite synchronization signal, it is possible to transmit and output a color video signal that produces a special effect color image, and the phase shift of the color burst signal can be changed by 180 degrees.゜ (polarity inversion), for example, when photographing a so-called color negative film through photographic development, it is possible to transmit a color video signal with the original hue and brightness of the subject of the color negative film, and it is possible to easily form various captions. By switching the switch between the original standard color video signal and the color video signal with special effects, you can obtain a color video signal with special effects at any time, and at a low cost. This method can be constructed with a simple circuit, and it has been a problem in conventional cases where the phase of the carrier color signal is reversed by inverting the polarity at the stage of the composite color video signal. It has the advantage that it is possible to eliminate the phase shift between the luminance signal and the color signal due to the influence of the transmission characteristics, and therefore there is no need for an adjustment circuit or the like (device) to correct this phase shift.

[Brief explanation of the drawing]

Figure 1 is a block system diagram showing an embodiment of the color video signal imaging device of the present invention, and Figure 2 is
A vector diagram showing the relationship between the color burst signal phase of the NTSC color video signal and the phase of each hue, as well as the inverted color burst signal phase in the device of the present invention. FIGS. 3A to 3D are signal waveforms for explaining the operation of FIG. 1, respectively. It is a diagram. 1... Color signal image pickup tube, 9... RGB process circuit, 13... Burst flag generator, 14...
...First changeover switch, 15,33...Inverting circuit, 17,20...Balanced modulator, 27...Second changeover switch, 31...Color video signal output terminal, 32...White level clamp circuit ,3
4...Vector of polarity inverted color burst signal.

Claims (1)

[Scope of utility model registration request] In a color video signal imaging device that outputs a color video signal by photoelectrically converting light from an object to be imaged and transmitting a luminance signal and a carrier color signal obtained through predetermined processing together with a composite synchronization signal and a color burst signal. , the color burst signal is 180
a phase shift circuit that shifts the phase of the luminance signal at and near the angle; an inversion circuit that inverts the polarity of the luminance signal other than the composite synchronization signal with respect to the original polarity; and the color burst signal to be transmitted and the phase shift circuit. a first changeover switch for switching between the luminance signal excluding the composite synchronization signal to be transmitted and the output polarity-inverted luminance signal of the inversion circuit; a second changeover switch for switching so that either one of the color burst signals to be transmitted and the luminance signal excluding the composite synchronization signal is transferred by the phase shift circuit in place of one or both of the color burst signal to be transmitted and the luminance signal excluding the composite synchronization signal; It is characterized in that it can be arbitrarily switched to transmit and output either or both of the phased color burst signal and the output polarity inverted luminance signal of the inversion circuit together with the carrier color signal and the composite synchronization signal. Color video signal imaging device.