JPS61107889A - Color image pick-up device - Google Patents

Abstract

PURPOSE:To generate a good color picture by detecting a phase difference of a start edge part index signal and a finish edge part index signal which occur respectively in the output signal of the image pick-up tube, and obtaining a frequency in the electronic beam. CONSTITUTION:By using an index signal generated respectively in correspondence to the pattern for generating the index signal installed at a start edge part and a finish edge part and both edge parts in the horizontal direction in a photo-electric converting part 4 of the image pick-up tube 2, frequency information in the electronic beam scanning and initial phase information for respective horizontals scanning periods are obtained. By using frequency information in the electronic beam scanning and initial phase information for respective horizontal scanning periods, on the basis of an information signal stored in a memory device MA and one side signal out of the output signals of the image pick-up tube 2, the controlling is executed so that a variation mode on the time base of other signal may be made consistent.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a color television (hereinafter abbreviated as TV) imaging device, in particular, to a color separation striped filter to the photoelectric conversion surface of an imaging tube. The present invention relates to a color imaging device configured to be provided in an optical path.

(Prior art) A color-separating striped filter is provided in the optical path up to the photoelectric conversion surface of the image pickup tube, and a striped color-separated image of the object to be imaged is applied to the photoelectric conversion surface of the image pickup tube. It is well known that various types of color imaging devices that generate multiplexed signals have been known for a long time, but most of them are configured according to the so-called general phase separation method. Even if it is configured according to the so-called general frequency separation method, there are various problems, so the applicant company has decided to use the conventional general phase separation method. In order to provide a color imaging device that does not have the problems of those configured according to the separation method and those configured according to the general frequency separation method, Japanese Patent Publication No. 53-34
We proposed a color imaging system as disclosed in Japanese Patent Application No. 854, and as an improvement thereof, we proposed a color imaging device as disclosed in Japanese Patent Application Laid-open No. 59-153392, each having a predetermined width. It consists of repeating a specific arrangement pattern of a plurality of types of color strips, and the phase of the fundamental wave component of the image pickup tube output signal, which is determined corresponding to the repetition of the arrangement pattern, changes depending on the color of the light. A color separation striped filter, in which the colors of multiple types of color strips are set, is provided in the optical path to the photoelectric conversion section of the image pickup tube, so that the optical image of the object to be imaged is colored in the color separation stripe pattern. A constitutive pipe is provided for transmitting the image through a filter to a photoelectric conversion section of the picture tube, and a storage device capable of arbitrarily storing an information signal corresponding to at least one frame period of the output signal from the picture tube. and prior to imaging, capture an image of any specific color, and store an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device, and store the information signal in the storage device. In a color imaging device, a reference signal for color signal demodulation is obtained based on an information signal stored in a storage device, and a predetermined color signal is demodulated from an output signal of an image pickup tube by synchronous detection or the like. One of the two signals, the information signal obtained by reading out the information signal obtained by reading the information signal and the output signal of the image pickup tube, is used as a reference, and the change mode of the other signal on the time axis is used as the reference. A color imaging device has been completed which is equipped with means for controlling the signal so as to match the manner in which the signal changes on the time axis.

By implementing this, we have achieved many results.

(Problems to be solved by the invention) However, in the color field image device disclosed in the above-mentioned Japanese Patent Laid-Open No. 59-153392, it is difficult to read the information signals stored in the storage device as described above. One of the two signals, the obtained information signal and the output signal of the image pickup tube, is used as a reference, and the change mode of the other signal on the time axis is set to the above-mentioned t & quasi. In order to perform control to match the change pattern on the time axis, index signals corresponding to scanning state signal generation patterns provided near the start end and near the end of the horizontal scanning period are included. Since the initial phase information for each horizontal scanning period in electron beam scanning obtained from the output signal of the image pickup tube is used, the frequency information in electron beam scanning described above is obtained throughout the period including the video period. It has become something like this.

However, the signals generated during the video period.

Depending on the conditions of the incident light, the carrier wave in the color multiplexed signal may not be generated. Therefore, as in the conventional color imaging device described above, frequency information in electron beam scanning is obtained throughout the period including the image period. When there is no incident light in the video period and no carrier wave is generated in the color multiplexed signal, a means is required to prevent the influence of the carrier wave from occurring in the color multiplexed signal, and also from the viewpoint of stability. The problem was that it wasn't enough.

(Means for Solving the Problem) The present invention corresponds to the repetition of the above-mentioned arrangement pattern, which consists of repeating a specific arrangement pattern of a plurality of types of colored strips each having a predetermined strip inside. The color separation striped filter, in which the colors of each of the plurality of color strips are set, is applied to the photoelectronic tube of the image pickup tube so that the phase of the fundamental wave component of the image pickup tube output signal determined by the color changes depending on the color of the light. A constitutive piping provided in the optical path to the conversion section so that the optical image of the object to be imaged is given to the photoelectric conversion section of the image pickup tube via the color separation striped filter, and a conduit for transmitting the output signal from the image pickup tube. A storage device capable of arbitrarily storing information signals corresponding to at least one frame period is provided.

Prior to imaging, any specific color is imaged, and an information signal corresponding to at least one frame period of the image pickup tube output signal is stored in the storage device, and the information signal stored in the storage device is In a color imaging device, a reference signal for color signal demodulation is obtained based on the image pickup tube's output signal, and a predetermined color signal is demodulated from the output signal of the image pickup tube by synchronous detection. A signal generation pattern that can generate an index signal that corresponds to the mode of scanning by the electron beam when scanning with the electron beam is installed both near the start end and near the end of the image pickup tube up to the photoelectric conversion section of the image pickup tube. The means provided in the optical path and the signal generation patterns provided in the horizontal direction vicinity of the photoelectric conversion section of the image pickup tube and near the terminal end in the horizontal direction respectively correspond to the output signal of the image pickup tube. Means for detecting the phase information of each of the starting end index signal and the ending end index signal occurring in each of the signals, and the phase information of the starting end index signal occurring in the output signal of the image pickup tube, respectively. means for obtaining initial phase information for each horizontal scanning period in electron beam scanning based on the phase information of one of the index signal and the phase information of the end index signal; and an output of the Wfft tube. The above-mentioned information is obtained using the phase information of the start-end index signal and the phase information of the end-end index signal respectively occurring in the signal.

A means for obtaining frequency information in electron beam scanning based on the phase difference between both index signals, and initial phase information for each horizontal scanning period in electron beam scanning and frequency information in electron beam scanning are used to store information in a storage device. an information signal obtained by reading out a stored information signal;
The output signal of the image pickup tube is set to one of the two signals, and the change mode of the other signal on the time axis is made to match the change mode of the one signal on the time axis, which is the reference signal. The present invention provides a color imaging device provided with a means for controlling the color image capturing apparatus.

(Example) Hereinafter, specific contents of the color imaging device of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are block diagrams of different embodiments of the color imaging device of the present invention, in which 0 is the object to be imaged, 1 is the imaging lens, 2 is the imaging tube, 3 is the deflection yoke, and 4 is a photoelectric conversion unit (target having a photoelectric conversion surface) of the image pickup tube 2, F is an optical color separation striped filter (color separation striped filter), 5 is a front plate of the image pickup tube 2, PrA is a preamplifier, t, pFy, LPF 12 is a low-pass filter (low-pass filter), and BPF is a bandpass filter. Note that if an electrostatic deflection type image pickup tube is used as the image pickup tube 2,
Needless to say, the deflection yoke 3 is unnecessary.

In the color imaging apparatus shown in FIGS. 1 to 4, an optical image of an object 0 is transmitted through a color separation striped filter F to an imaging tube 2
When applied to the photoelectric conversion unit 4, a color multi-carrier wave having a DC component and a specific repetition frequency is output from the bone tube 2 corresponding to the optical image of the imaging object 0 (amplitude 2 phase by number a). The output signal of the image pickup tube 2 containing the modulated wave is output, but in the color imaging device of the present invention, the horizontal starting end and the ending point of the photoelectric conversion section 4 of the image bone canal 2 are outputted. A signal generation pattern capable of generating an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam is provided on both ends of the photoelectric conversion unit 4 of the image pickup tube 2. Since the output signal of the image pickup tube 2 is provided in the optical path of the image pickup tube 2, the optical conversion section 4 of the image pickup tube 2 is provided at both ends in the horizontal direction, the starting end and the ending end. The index signals generated in correspondence with the respective index signal generation patterns are included.

In the color imaging device of the present invention.

Using index signals generated in correspondence with the index signal generation patterns provided at both the horizontal start end and end end of the optical conversion section 4 of the image pickup tube 2 described above, Frequency information in electron beam scanning and initial phase information for each horizontal scanning period are obtained, and using the frequency information in electron beam scanning and initial phase information for each horizontal scanning period described above, As shown in FIG.
Using one of the two signals as a reference, the change mode of the other signal on the time axis is controlled so as to match the change mode of the one signal on the time axis, which is the reference signal. It is.

As described above, as the pattern for generating the index signal that should be provided in the optical path up to the photoelectric conversion section 4 of the image pickup tube 2, for example, the pattern of the color separation striped filter F described above can also be used. You can also do it like this,
In that case, in order to generate an index signal from the pattern of the color separation striped filter F, light of an arbitrary specific color is used as bias light in the horizontal scanning direction of the color separation striped filter F. What is necessary is to irradiate both ends of .

Further, as another example of the above-described index signal generation pattern that should be provided in the optical path up to the photoelectric conversion unit 4 of the above-mentioned image pickup tube 2, there is 1, for example, the horizontal scanning direction of the above-mentioned color separation striped filter F. A black and white pattern may be provided on both ends of the photoelectric conversion section 4 of the image pickup tube 2.
A pattern may be formed on both ends in the horizontal scanning direction of the image pickup tube 2, or a vine-like member that generates a predetermined index pattern may be placed in the optical path to the image pickup tube 2, and the pattern provided on the member may be An optical image may be formed on the photoelectric conversion section 4 of the image pickup tube 2, and an index signal may be generated when the photoelectric conversion section 4 is scanned with an electron beam.

FIG. 5 shows an index signal generation pattern to be provided in the optical path up to the photoelectric conversion section 4 in the image pickup tube 2 as described above in the color imaging device of the present invention, that is, a pattern for generating an index signal in the photoelectric conversion section 4 of the image pickup tube 2. At both the starting end and the ending end in the horizontal scanning direction, there is a setting area for a signal generation pattern that generates an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam. FIG. 5 illustrates and explains an example of setting the range of electron beam scanning performed on the photoelectric conversion unit 4 of the image pickup tube 2 and what relationship should be used.

The square frame on the outer periphery indicates the range of electron beam scanning performed on the photoelectric conversion unit 4 of the image pickup tube 2, and the diagonally shaded area in Figure 1 indicates the setting area of the index signal generation pattern. The horizontal direction in the figure is the horizontal scanning direction.

Now, the one-color separation striped filter F is, for example, shown in (a) in FIG.
As shown, red (R), green (G).

consisting of strips of each color of blue CB) arranged in a predetermined repeating order, or
As shown in FIG. 6(b), the strips of green (G), cyan (Cy), and golden light (W) are arranged and heated in a predetermined repeating order. In addition, those consisting of repeating specific arrangement patterns of arbitrarily selected plurality of colored strips are used.

The color stripes of each color whose color components are to constitute the striped filter F should be set in consideration of brightness characteristics and color reproducibility, and the strips and colors should be set, for example: In Figure 6 (
In the color separation striped filter F illustrated in a), (in the green color strip)〉(in the red color strip)〉(in the blue color strip) The figure shows an example in which the strip middle of each color strip is determined as shown in (Strip middle).

1 to 4, the output signal from the image pickup tube 2 (
The color multiplexed signal) is a DC component and a color separation striped filter F.
The repetition period T of the set of color strips in ((a) of Fig. 6)
, a signal in the form of a signal including a single carrier wave having a frequency shown as the reciprocal of T) in (b'') and a modulated wave whose amplitude is one-phase modulated by a plurality of color information. Therefore, the color multiplexed signal is divided into a DC component and a fundamental wave component of the carrier wave, and a predetermined signal is applied to each of the fundamental wave components of the carrier wave, which are amplitude-7 phase modulated by the plurality of color information mentioned above. By performing synchronous detection using a reference signal that has a phase.

Each predetermined color signal can be demodulated individually, but when demodulating each of the above-mentioned color signals, reference signals each having a predetermined phase are required.

The phase of the fundamental wave component of the single carrier wave in the output signal of the image pickup tube of the color image pickup device described above is determined for each color of the plurality of types of color stripes that constitute the color separation striped filter F. Therefore, if light of any specific color is imaged through a one-color separation striped filter prior to the start of imaging by a color imaging device, the fundamental wave component of the carrier wave appearing in the output signal of the image pickup tube at that time can be detected. The phase is determined in correspondence with the above-mentioned arbitrary specific color of light, and the phase is determined by the carrier and transmission that appear in the output signal of the image pickup tube in correspondence with the above-mentioned arbitrary specific color of light. The phase of the fundamental wave component of the transmitted wave that appears in the output signal of the image pickup tube in correspondence with each color other than the color corresponding to any specific color of light is the phase of the fundamental wave component of the transmitted wave can be used as a standard.

Therefore, as mentioned above, prior to the start of imaging by the color imaging device, light of any particular color is imaged through the color separation striped filter, and the single color obtained at that time in the output signal of the imaging tube is The fundamental wave component of the carrier wave is stored in a storage device, and during the imaging operation in the color m-image device, the fundamental wave component of the carrier wave stored in the storage device is read out, and based on it, each predetermined phase is set. By generating a reference signal having , it is possible to generate a desired color video signal using the color imaging device having the above-described configuration.

By the way, if the scanning mode of the electron beam in the illumination tube 2 is always constant, the signal created based on the signal read out from the storage device as described above will always be the fundamental wave in the output signal of the image pickup tube 2. However, the deflection circuit and deflection yoke in color imaging devices are not sufficiently stable, and the scanning mode by the electron beam also changes depending on the external magnetic field. Even if you read out an information signal stored in advance in a storage device and create a signal that is the same as the fundamental wave in the output signal of the image pickup tube 2 based on it, it is not always possible to obtain the correct signal. There is no limit.

Therefore, in the color imaging device of the present invention, an image pickup tube output signal is formed by repeating a specific arrangement pattern of a plurality of types of color stripes each having a predetermined stripe, and is determined in correspondence with the repetition of the arrangement pattern. A color separation striped filter F in which the colors of each of the plurality of color stripes are set so that the phase of the fundamental wave component changes depending on the color of the light.
is provided in the optical path to the photoelectric conversion section 4 of the image pickup tube 2.

Constituent piping that allows an optical image of the object to be imaged to be given to the photoelectric conversion unit 4 of the image pickup tube 2 via the color separation striped filter F, and at least one frame period of the output signal of the tjk image tube bone tube etc. A memory group that can arbitrarily store information signals corresponding to
MA is provided, which images any specific color prior to imaging, stores an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device MA, and stores the information signal corresponding to at least one frame period of the image sensor output signal in the storage device MA; [A color imaging device that obtains a reference signal for color signal demodulation based on the information signal stored in the MA, and demodulates a predetermined color signal from the output signal of the image pickup tube 2 by synchronous detection or the like. , the image pickup tube 2
A signal generation pattern capable of generating an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam both near the start end and near the end in the horizontal scanning direction in the photoelectric conversion unit 4 of Image tube 2
means provided in the optical path up to the photoelectric conversion unit 4 in the above-mentioned image pickup tube 2, corresponding to the signal generation butterfly provided near the horizontal start end and near the end of the photoelectric conversion unit 4 of the image pickup tube 2, respectively. means for detecting phase information of each of the starting end index signal and the ending end index signal occurring in the output signal of the image pickup tube 2;

Each horizontal scan in electron beam scanning is performed based on the phase information of one of the index signal phase information of the starting end index signal and the phase information of the trailing end index signal respectively occurring in the output signal of the image pickup tube 2 described above. Means for obtaining initial phase information for each period, and the phase information obtained by using the phase information of the start end index signal and the phase information of the end end index signal respectively occurring in the output signal of the image pickup tube 2. means for obtaining frequency information in electron beam scanning based on the phase difference between both index signals, and initial phase information and frequency information in electron beam scanning for each horizontal scanning period in the electron beam scanning repeater described above. Using one of the two signals, the information signal obtained by reading out the information signal stored in the device iMA and the output signal of the image pickup tube, as a reference, the change mode of the other signal on the time axis is calculated. The above-mentioned problem is solved by a simple configuration in which a control means is provided to match the variation pattern of one of the reference signals on the time axis.

In FIGS. 1 to 4, the output signal (multiplexed color signal) of the image pickup tube 2 output from the preamplifier PrA is passed through the low-pass filters LPFy, LPF Q and the bandpass filter BP.
The output signals from the low-pass filters i and pFy (direct wave three-color mixture signal), whose cutoff frequency is illustrated as fy in FIG. 6 is output. Song 1LPFy in Figure 7
is an example of the pass-regression characteristic of the low-pass filter LPFy, and the curve LPF Q in FIG.

BPFI etc. are examples of passband characteristics of a low-pass filter LPF ffi and a bandpass filter BPFI, respectively.6 The above-mentioned low-pass filter whose cut-off frequency is illustrated as fA in FIG. The output signal from the filter LPF Ω is supplied to the matrix circuit MTX as a narrowband luminance signal S2 used for creating a color signal, and the bandpass filter BPF divides the space defined by the repeating pattern of the filter strips in the color separation striped filter F. A modulated color signal based on the fundamental wave existing around the frequency fl is extracted and supplied to the following channels.

That is, the modulated color signal based on the fundamental wave described above is the first
In the circuit piping of the embodiment shown in FIGS. 2 and 4, respectively, the synchronous detectors 5DETI, 5
In the circuit piping of the embodiment shown in the third diagram, the modulated color signal by the fundamental wave is supplied to the synchronous detector 5DETI via the variable delay circuit VDL.
, 5DET2. Furthermore, in the circuit piping of the embodiments shown in FIGS. 1, 2, and 4, the modulated color signal by the fundamental wave described above is supplied to the phase detection circuit PDET. However, after passing the modulated color signal based on the fundamental wave through the variable delay circuit VDL, the phase detection circuit PDET in the circuit piping shown in FIG. Provided as input.

As the other input to the phase detection circuit PDET described above, in the circuit piping of the embodiment shown in FIGS. 1 to 3, the output signal of the memory bag [MA] is supplied, and The phase detector POET in the circuit piping shown in FIG. 4 is supplied with a signal obtained by converting the output signal of the storage device 1MA in frequency by the frequency conversion circuit FCONV2 as the other input. Further, in the circuit piping of the embodiment shown in FIG. 4, the modulated color signal by the fundamental wave is as follows.

It is also supplied to the frequency conversion circuit FCONVI.

The output signal from the phase detection circuit PDET described above is as follows.

The signal is supplied to the gate circuit GPI and the gate circuit GP2, and one of the two gate circuits GPI and GP2 detects the image pickup tube 2 in each horizontal scanning period according to the index pattern described above. A phase detection circuit PDE at a time position where one of the above-mentioned index signals appearing in the output signal is present.
The other gate circuit GP2 of the two gate circuits GPI and GP2 detects the output of the image pickup tube 2 in each horizontal scanning period according to the index pattern described above. It is designed to extract the phase detection output of the phase detection circuit PDET at the time position where the other one of the above-mentioned index signals appearing in the signal exists.

For this purpose, the two gate circuits GPI and GP2 described above are connected to a synchronizing signal generator S provided in the color imaging device.
Based on the HD pulse generated by G, the gate signal generation circuits GSpl and GSp2 are supplied with gate signals Sp1 and Sp2 generated at predetermined timings, respectively, so that the gate circuit Gpl outputs the output signal of the image pickup tube 2. From among them, extract the phase detection output at the time position where one of the index signals described above that appears in the output signal of the image pickup tube 2 exists in the output signal of the image pickup tube 2 every horizontal scanning period according to the index pattern described above, Further, the gate circuit Gp2 described above extracts the phase detection output at the time position according to the index pattern described above.

The phase detection output output from the gate circuit 4P1 described above is held by the capacitor C1 and is supplied to the subtracter SOB as one input thereof, and also The output signal from the gate circuit GPI is also supplied to the access signal generator 05Ca in the storage device MA,
Further, the output signal from the gate circuit GPI in the circuit piping of the embodiment shown in the second diagram is also supplied to the deflection circuit DHFC, and further, the output signal from the gate circuit GPI in the circuit piping of the embodiment shown in the third diagram is The output signal from the circuit GPI is also supplied to the variable delay circuit VDL, and the output signal from the gate circuit GPI described above in the circuit piping of the embodiment shown in FIG.
It is also supplied to the one-shot multivibrator ■ in 5C.

Further, the phase detection output outputted from the gate circuit GP2 described above is held by the capacitor C2, and
It is supplied as the other input to the subtracter SOB mentioned above.

The phase detection output output from the gate circuit GPI described above is the initial phase information for each horizontal scanning period in electron beam scanning, and is also the phase detection output from the gate circuit GP1 and the phase detection output from the gate circuit GP2. Since the output signal from the subtraction circuit SUB that outputs the difference signal is frequency information in electron beam scanning,
In the circuit piping of each embodiment shown in the figure, initial phase information for each horizontal scanning period in electron beam scanning obtained as described above and frequency information in electron beam scanning are used to store Based on one of the two signals, the information signal obtained by reading out the information signal stored in the device HA and the output signal of the image pickup tube,
Control is performed so that the manner of change of the other signal on the time axis matches the manner of change of one signal on the time axis, which is used as a reference.

Now, the storage device MA shown in each of FIGS. 1 to 4 described above stores a small number of images of an image pickup tube obtained by capturing an arbitrary specific color before the color image pickup device starts color imaging. Both stores an information signal corresponding to one frame period,
Further, in a state after the color imaging device starts an imaging operation, the color imaging device is configured to perform an operation that can send out the stored information signal as a signal in a continuous state on the time axis. This is what is used. The storage element used in the storage device iMA may be a digital memory or an analog memory.

The memory devices shown in FIGS. 1 to 3, respectively [
In MA, it is assumed that a digital memory is used as a storage element. In the figure, ADC is an analog-to-digital converter, DM is a digital memory, DAC is a digital-to-analog converter, osCa is an address signal generator, and 05Cc is a clock. It is a signal generator. Although the specific configuration of the storage device HA shown in FIG. 4 is not shown, in any case, the storage device HA to be used in the circuit piping shown in FIGS. is information corresponding to at least one frame period of the fundamental wave component (signal component that has passed through the IF bandpass filter BPF) in the output signal of the image pickup tube obtained by imaging an arbitrary specific color prior to imaging the object to be imaged. We need something that can store the signal.

An information signal of at least one field period or more of the fundamental wave component (the signal component that has passed through the IF band filter BPF) in the output signal of the image pickup tube that is to be sent to the storage device MA prior to imaging the object to be imaged. The storage operation is started by operating a predetermined operation button on an operation section (not shown) provided on the color imaging device.

That is, when a predetermined operation button on the operation unit provided in the color imaging device is operated, light of an arbitrary specific color is automatically copied to the image pickup tube, for example, and the storage device HA is configured to store the image. As a mode, at least one frame period of the signal component of the output signal of the image pickup tube 2 that has passed through the bandpass filter BPF is stored in the memory of the storage device.

Memory device 5! The information signal to be stored in the MA is (
b) As mentioned above, the fundamental wave component in the image pickup tube output signal (b)
A signal obtained by dividing the fundamental wave component in the image pickup tube output signal, (c)
Any signal obtained by beating down the fundamental wave component in the image pickup tube output signal with a frequency converter (this can be implemented by using a frequency converter circuit as in the circuit piping of the embodiment shown in FIG. 4) can be used.

In the circuit piping shown in FIGS. 1 to 3, the analog-to-digital converter ADC performs an AD conversion operation using a sampling pulse given from a pulse source (not shown), supplies a digital signal to a digital memory, and opens the digital memory. stores the digital signal applied to it. Storage of sequential digital signals in the digital memory DM is as follows:
Needless to say, this is performed by the address signal generated by the address signal generator 05Ca.
It is operated by a clock signal generated by 5Cc.

The storage device i! MA is put into memory mode.

When the information signal corresponding to one frame period has been stored in the digital memory DH, the storage device MA is put into the read mode, and the information signal stored corresponding to one frame period is output from the digital memory DM. is repeatedly read out, converted into an analog signal by a digital-to-analog converter DAC, and then output from the storage device MA.
The output signal from the storage device MA is supplied to a reference signal generator SSG.

The reference signal generator SSG described above generates a synchronous detector 5DETI based on the signal supplied from the storage device MA.

It generates continuous reference signals each having a predetermined phase required when demodulating the color signal in 5DET2 and supplies them to the synchronous detectors 5DETI and 5DET2, which includes, for example, a phase-locked loop. The synchronous oscillator may be composed of a synchronous oscillator and a phase shifter.

Further, in the circuit piping of the embodiment shown in FIG.

When the storage device WMA is placed in the storage mode prior to the imaging operation, the information signal corresponding to a period of one frame period or more to be stored in the memory of the storage device MA changes the output signal of the image pickup tube to a frequency. It is a signal whose frequency has been converted by the conversion circuit FCONVI, and it is also a signal whose frequency has been converted by the conversion circuit FCONVI.
After the above-mentioned signal has been stored in A, when the storage device MA is put into the read mode and the information signal stored therein is repeatedly read out from the memory, the information signal output from the storage device MA undergoes one frequency conversion. The signal to be stored at A in the storage device is frequency-converted by the circuit FCONV2, restored to a signal in the same frequency band as the output signal of the image pickup tube, and then supplied to the reference signal generator SSG. , and the signal read from the storage device MA are different from the embodiments shown in FIGS. 1 to 3 in that each signal has been subjected to frequency conversion.

Now, in the color imaging device shown in FIG. Each component operates in a related manner so that the output signal that is output from the image pickup tube changes in accordance with the manner in which the output signal changes on the time axis. In the circuit piping shown in FIG. , each component operates in a related manner so that the modulated color signal by the fundamental wave actually output from the image pickup tube changes on the time axis during the imaging operation; In the illustrated circuit piping, the memory bag fi! The mode of change on the time axis of the information signal obtained by converting the frequency of the information signal read from the HA by the frequency conversion circuit FCONV2 is the change on the time axis in the output signal actually output from the image pickup tube during imaging operation. First, the color imaging device of the embodiment shown in the first figure is put into the imaging mode and the storage device is changed. When the information signal is read out from M'A, the output signal from the bandpass filter BPF, that is, the color signal modulated by the fundamental wave in the output signal of the image pickup tube is sent to the synchronous detector 5DETI.

5DET2 and the phase detection circuit PDET.

On the other hand, at that time, the signal read from the digital memory D^ of the storage device MA and converted into an analog signal by the digital-to-analog converter DAC, that is, the storage device ! A signal in which the fundamental wave in the output signal of the image pickup tube, which has been previously stored in the MA, is converted into a reference signal by the reference signal generator SSG is supplied to the synchronous detectors 5DETI and SDEτ2, and is also used for the above-mentioned imaging. A restored signal of the fundamental wave in the output signal of the image pickup tube, which has been previously stored in the storage device MA, is supplied to the phase detection circuit PnET.

The above-mentioned phase detector PDET has two signals applied thereto, that is, a color signal modulated by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF;
A phase error signal corresponding to the phase difference between the output signal of the image pickup tube and the restored signal of the fundamental wave, which is stored in advance in the storage device HA prior to imaging, is output.

Since the phase error signal output from the phase detector PDET described above is supplied to the gate circuits GPI and GP2, the phase error signal extracted by the gate circuits GPI and GP2 is transmitted to the photoelectric sensor of the image pickup tube 2 as described above. These are the portions in which index signals generated in correspondence with the index signal generation patterns provided at the horizontal start and end portions of the converter 4 are interposed.

The phase error signal extracted by the gate circuit GPI is
It is used to reset the address signal generator 03Ca in the memory bag HMA, but the address signal generator 05
By resetting Ca, the initial phase in horizontal scanning of the electron beam is set correctly, so that correct centering is performed.

Furthermore, since the signal obtained by subtracting the phase error signals extracted by the gate circuits GPI and GP2 by the subtraction circuit SOB is the frequency information of electron beam scanning,
The clock signal generator 05C in the storage device MA
The period of the clock signal generated by the clock signal generator 05Cc is changed in the direction in which the frequency difference between the two signals described above becomes zero.

As a result, the period of the clock signal output from the clock signal generator 05Cc is changed, so that the signal supplied from the storage device MA is filtered by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF. This shows a time axis variation similar to that of the modulated color signal.

Next, the color imaging device of the second illustrated embodiment is put into the imaging mode and the storage device! HA (Memory bag [MA is terminal 7
The bandpass filter is equipped with an address signal generator 05Ca that is reset by a reference synchronization signal supplied to the address signal generator 05Ca (the same applies to the memory bag HMA in FIG. 3, which will be described later). The output signal from the BPF, that is, the color signal modulated by the fundamental wave in the output signal of the image pickup tube, is supplied to the synchronous detectors 5DETI and 5DET2 and the phase detection circuit PDET, and in this state, the above-mentioned phase detection Since the circuit PDET is supplied with the information signal read from the storage device 1iMA, the phase detector PDET uses the two signals applied thereto, that is, the bandpass filter BPF.
The modulated color signal by the fundamental wave in the image pickup tube output signal output from the image pickup tube and the storage device l! prior to imaging. A phase error signal corresponding to the phase difference between the output signal of the image pickup tube and the restored signal of the fundamental wave, which is stored in advance in A, is output.

Since the phase error signal output from the phase detector PDET described above is supplied to the gate circuits GPI and GP2, the phase error signal extracted by the gate circuits GPI and GP2 is transmitted to the photoelectric sensor of the image pickup tube 2 as described above. These are the portions where index signals generated corresponding to the index signal generation patterns provided at the horizontal start and end portions of the converter 4 exist.

The phase error signal extracted by the gate circuit GPI is
By being supplied to the deflection circuit DHFC, deflection is performed so that the initial phase of the horizontal scanning of the electron beam is set correctly, so that correct centering is performed.

Furthermore, since the signal obtained by subtracting the phase error signals extracted by the gate circuits GPI and GP2 by the subtraction circuit 5LIB is the frequency information of electron beam scanning, by supplying it to the deflection circuit DHFC, 2 The frequency difference between the signals is controlled to be changed toward zero.

In the example shown in the second figure, it is assumed that an electromagnetic deflection type is used as the image pickup tube 2, but in practice, an electrostatic deflection type may be used as the image pickup tube 2. In that case, it goes without saying that the deflection circuit used will also be changed accordingly.

In the color imaging device shown in the second figure, the deflection circuit DHFC is configured to perform a deflection operation at predetermined horizontal and vertical deflection frequencies during imaging of any specific color performed prior to imaging the imaging target. It is natural that this is being done.

In the embodiment shown in FIG. 2, the deflection operation is controlled by the output signal from the gate circuit GPI so as to achieve good centering as described above.

In addition, the deflection frequency of the electron beam is changed by the output signal from the subtracter SUB, so that the bandpass filter B
The modulated color signal based on the fundamental wave in the image pickup tube output signal output from the PF is stored in the storage device by the reference signal generator S.
The output signal of the reference signal generator SSG exhibiting a time axis variation similar to the time axis variation of the output signal of the storage device to MA supplied to the SG, that is, the time axis variation similar to the time axis variation of the reference signal. It becomes a signal indicating .

Next, when the color imaging device of the embodiment shown in the third figure is put into the imaging mode and the information signal is read out from the storage device MA, the output signal from the bandpass filter BPF, that is, the output signal from the bandpass filter BPF The modulated color signal based on the fundamental wave in the output signal of the image pickup tube obtained through The signal converted into an analog signal by A, that is, the restored fundamental wave signal in the output signal of the image pickup tube, which has been stored in the storage device A in advance before imaging, is sent to the reference signal generator SSG. and phase detection circuit PO
ET, and the above-mentioned phase detection circuit PDET is supplied with a signal that has passed through the variable delay circuit VDL. The reference signal generated by the reference signal generator SSG mentioned above is supplied to the synchronous detectors 5DETI and 5DET2.

In the phase detection circuit PDET described above, the two signals given to it, that is, the modulated color signal by the fundamental wave in the image pickup tube output signal output from the variable delay circuit VDL, and the color signal A to be stored in the storage device prior to imaging. A phase error signal corresponding to the phase difference between the prestored output signal of the image pickup tube and the restored signal of the fundamental wave is output.

Since the phase error signal output from the phase detector PDET described above is supplied to the gate circuits GPI and GP2, the phase error signal extracted by the gate circuits GPI and GP2 is transmitted to the photoelectric sensor of the image pickup tube 2 as described above. These are the portions where index signals generated corresponding to the index signal generation patterns provided at the horizontal start and end portions of the converter 4 exist.

The phase error signal extracted by the gate circuit GPI is
By being supplied to the variable delay circuit VDL, the delay amount of the variable delay circuit VDL is controlled so that the initial phase in horizontal scanning of the electron beam is correctly set and correct centering is performed.

Furthermore, since the signal obtained by subtracting the phase error signals extracted by the gate circuits GPI and GP2 by the subtraction circuit SOB is the frequency information of electron beam scanning, it is supplied to the variable delay circuit VDL. , the delay amount is controlled so that the frequency difference between the two signals described above is changed to zero.

As described above, the color signal modulated by the fundamental wave in the image pickup tube output signal output from the IF bandpass filter BPF is
By controlling the delay amount by the variable delay circuit VDL, the modulated color signal by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF is transferred to the storage device HA.
This shows a time axis variation similar to that of the signal supplied to the reference signal generator SSG.

Next, in the embodiment shown in FIG. 4, the modulated color signal output from the bandpass filter BPF is supplied to the synchronous detectors 5DETI and 5DET2 and the one-phase detection circuit PDET, respectively.

The frequency conversion circuit FCONVI described above is provided with a carrier wave for frequency conversion from the oscillator O5C. The same oscillator O, also known as the oscillator O5, supplies a carrier wave for frequency conversion to the frequency conversion circuit FCONV2.
A carrier wave for frequency conversion is supplied from the SC.

The signal output from the frequency conversion circuit FCONVI described above is stored in the storage side IA when the storage table [MA is put into the write mode, and is stored in the storage device i! When the iMA is placed in read mode, its stored contents are repeatedly read. If the signal stored in the storage device iMA as described above is a signal obtained by beating down the original signal by the frequency conversion operation in the frequency conversion circuit FCONVl, then the storage capacity will be reduced. Little storage device! ! The advantage is that it allows the use of MA.

The above storage table [MA is put into storage mode].

When the information signal corresponding to a suitable period of one frame period or more has been stored therein, the storage device i! The MA is then put into read mode and the information signals stored in it are repeatedly read out from the storage device MA and sent to the frequency conversion circuit FCON.
Supplied to V2.

The frequency conversion circuit FCONV2 includes an oscillator OSC.
A carrier wave for frequency conversion is supplied from the frequency conversion circuit FCONV2, and the output signal from the frequency conversion circuit FCONV2 is frequency-converted by the single frequency conversion circuit FCONV2.The output signal from the frequency conversion circuit FCONV2 is supplied to the reference signal generator SSG and at the same time, is also supplied to the single phase detection circuit PDET. has been done.

Furthermore, the above-mentioned phase detection circuit PDETP is also supplied with a modulated color signal based on the fundamental wave in the output signal of the image pickup tube outputted from the above-mentioned bandpass filter BPF.
In the phase detector PDET, the two signals applied thereto, that is, the modulated color signal by the fundamental wave in the image pickup tube output signal output from the bandpass filter BPF, and the storage device MA before imaging. A phase error signal corresponding to the phase difference between the output signal of the image pickup tube and the restored fundamental wave signal stored in advance is output.

Since the phase error signal output from the phase detector PDET described above is supplied to the gate circuits GPI and GP2, the phase error signal extracted by the gate circuits GPI and GP2 is transmitted to the photoelectric sensor of the image pickup tube 2 as described above. These are the portions where index signals generated corresponding to the index signal generation patterns provided at the horizontal start and end portions of the converter 4 exist.

The phase error signal extracted by the gate circuit GPI is used to control the phase of the oscillation wave of the oscillator O3C.

Further, the signal obtained by subtracting the phase error signals extracted by the gate circuits GPI and GP2 by the subtraction circuit SUB is frequency information of electron beam scanning, which is used to control the frequency of the oscillation wave of the oscillator O5C described above. used for.

Therefore, by subjecting the oscillator O5C to the above-described frequency control and phase control, the frequency and phase of the oscillation wave are automatically controlled, so that the output signal of the frequency conversion circuit FCONV2 ( The reference signal generator SSG, which is supplied with a reference signal (reference signal), generates the reference signal necessary for synchronously detecting the output signal of the bandpass filter BPF with the correct phase, thereby making it possible to synchronize the output signal of the image pickup tube and the frequency. The control system described above is operated so that the change mode on the time axis matches the output signal (reference signal) from the conversion circuit FCONV2.

As described above, an example of the configuration of the oscillator O5C in which the angular frequency of the oscillating wave is controlled by the output signal from the subtracter 5tlB and the phase of the oscillating wave is controlled by the output signal from the gate circuit GPI is as follows. One example is the oscillator O5C shown in FIG.

The oscillator O3C shown in FIG. 4 is an older shot multivibrator, and vC
O is a resettable voltage controlled oscillator, and the resettable voltage controlled oscillator vCO has its oscillation frequency controlled by the voltage of the output signal of the subtracter SOB, and the timing for starting its oscillation is as follows. It is controlled by the output signal of the one-shot multivibrator H.

In other words, the one-shot multivibrator mentioned above ■
is H supplied to terminal 7 from synchronization signal generator SG.
It outputs a pulse with a time width from the time position of the leading edge of the D pulse to the time position of the trailing edge of the output pulse of the gate circuit GPI.
Since the one-shot multivibrator described above starts oscillating at a specific oscillation phase when the reset pulse output from the circuit disappears, the single oscillator OSC performs frequency control operation and phase control as described above. The frequency and phase of the oscillation wave are automatically controlled by the operation, and the output signal of the 1-frequency conversion circuit FCONV2 (
From the reference signal generator SSG to which the reference signal) is supplied,
A reference signal is generated that is necessary for synchronously detecting the output signal of the bandpass filter BPF in the correct phase.

The output signals from the synchronous detectors 5DETI and 5DBT2 and the output signal from the low-pass filter LPF Q are as follows.
Matrixed in the matrix circuit MTX,
Predetermined primary color signals are output to terminals 8-10, respectively.

(Effects of the Invention) As is clear from the above detailed explanation, the color imaging device of the present invention is made up of a repetition of a specific arrangement pattern of a plurality of types of color strips, each having a predetermined width. A color in which the colors of each of the plurality of color strips are set such that the phase of the fundamental wave component of the image pickup tube output signal, which is determined in accordance with the repetition of the arrangement pattern, changes depending on the color of the light. A constitutive piping system comprising a separation stripe filter in the optical path up to the photoelectric conversion section of the image pickup tube so that an optical image of an object to be imaged is given to the photoelectric conversion section of the image pickup tube via the color separation stripe filter. , a storage device capable of arbitrarily storing information signals corresponding to at least one frame period of the output signal from the image pickup tube, and prior to imaging, an arbitrary specific color is imaged and the image pickup tube output is An information signal corresponding to at least one frame period of the signal is stored in the storage device, a reference signal for color signal demodulation is obtained based on the information signal stored in the storage device, and the image pickup tube is thereby In a color imaging device in which a predetermined color signal is demodulated from the output signal of the image pickup tube by synchronous detection, etc., when scanning with an electron beam, there is a A signal generation pattern capable of generating an index signal that corresponds to the mode of scanning by an electron beam is provided in the optical path to the photoelectric conversion section of the image pickup tube in the horizontal direction in the photoelectric conversion section of the image pickup tube. Regarding the starting end index signal and the ending end index signal generated in the output signal of the image pickup tube corresponding to the signal generation patterns provided near the starting end and near the ending end, respectively,
The phase information of each of these signals is detected, and one of the phase information of the start end index signal and the phase information of the end end index signal respectively generated in the output signal of the image pickup tube is detected. The initial phase information for each horizontal scanning period in electron beam scanning is obtained based on the phase information of the starting edge index signal and the ending edge index generated in the output signal of the image pickup tube. Frequency information in electron beam scanning is obtained based on the phase difference with the phase information of the signal, and is stored using the initial phase information for each horizontal scanning period in electron beam scanning and the frequency information in electron beam scanning. An information signal obtained by reading out an information signal stored in the device and an output signal from the image pickup tube.
Using one of the two signals as a reference, the change S in the other signal on the time axis is made to match the change in the time axis of one of the two signals as a reference. Therefore, according to the color imaging device of the present invention, both the vicinity of the start end and the vicinity of the end in the horizontal scanning direction in the 1wl image tube bone tube electrical conversion section correspond to the mode of scanning by the electron beam during scanning by the electron beam. In addition to obtaining initial phase information for each horizontal scanning line from one of the index signals generated based on a signal generation pattern capable of generating an index signal such as The color imaging system of the present invention obtains frequency information in electron beam scanning by detecting the phase difference between the two index signals, a starting edge index signal and a trailing edge index signal, respectively occurring in the output signal. In the apparatus, there is no need to provide a special pattern for generating frequency information in electron beam scanning.

In addition, since the frequency information in electron beam scanning is created in a part other than the video period, the drawbacks that were encountered in the conventional example described above do not occur, and according to the present invention, it is easy to achieve stable and good results at all times. Accordingly, it is possible to provide a highly stable color imaging device that can easily generate color images.

[Brief explanation of drawings]

1 to 4 are block diagrams of embodiments of the color imaging device of the present invention, FIG. 5 is a diagram showing a pattern area for index signal generation, and FIG. 6 is a diagram showing the color imaging device of the present invention. FIG. 7 is a diagram showing an example of the configuration of the color separation striped filter used, and FIG. 7 is a diagram showing an example of the frequency distribution of the output signal of the image pickup tube. 0...wl image object, 1...imaging lens, 2...
Image tube. 3... Deflection yoke, 4... Photoelectric conversion unit of image pickup tube (target having a photoelectric conversion surface), F... Color separation striped filter, 5... Front plate of image pickup tube, 6-10. ...Terminal. PrA...Preamplifier, LPyF, LPFQ...
・Low pass filter (low pass filter), BPF...Band pass filter (band pass filter), VDL...Variable delay circuit,
MA...Memory device. PIIET...phase detection circuit, DHFC...deflection circuit, MTX...matrix circuit, OSC...oscillator, VCO...resettable voltage controlled oscillator, M
A... Storage device, ■... One-shot multivibrator, 51) ETl, 5DET2... Synchronous detection circuit, FCONVI, FCONV2... Frequency conversion circuit,
SSG...Reference signal generator, SG...Synchronization signal generator, GPI, GP2...Gate circuit, GSPI, G
SP2...gate signal generation circuit, SUB...subtraction circuit. Akira 5 Drawing procedure amendment (spontaneous) November 23, 1980 Patent Application No. 2211r ll) i No. 2, Title of invention Color imaging device 3, Relationship with the amended person case Patent Applicant Location: 3-12 Moriya-cho, Kanayō-ku, Yokohama, Kanagawa Prefecture Name (43)
2) Japan Victor Co., Ltd. 4, Agent address: Tokyo Parts and Design 3-4-19-915 No. 6, Detailed explanation of the invention in the specification subject to amendment 7, Contents of the amendment

Claims (1)

[Claims] The phase of the fundamental wave component of the image pickup tube output signal is determined by repeating a specific array pattern of multiple types of color strips, each having a predetermined strip width, and the phase of the fundamental wave component of the image pickup tube output signal is determined in accordance with the repetition of the array pattern. A color separation striped filter, in which the colors of the plurality of color strips are set so as to change depending on the color, is provided in the optical path to the photoelectric conversion section of the image pickup tube, and the light of the object to be imaged is Constituent piping that allows an image to be applied to a photoelectric conversion section of an image pickup tube via a color separation striped filter, and a memory capable of arbitrarily storing an information signal corresponding to at least one frame period of an output signal from the image pickup tube. A device is provided, which images an arbitrary specific color prior to imaging and stores an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device; In a color imaging device, a reference signal for color signal demodulation is obtained based on the information signal stored in the image pickup tube, and a predetermined color signal is demodulated from the output signal of the image pickup tube by synchronous detection or the like. A signal generation pattern is provided near the start end and near the end in the horizontal scanning direction of the photoelectric conversion section of the photoelectric conversion unit, which can generate an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam. A means provided in the optical path up to the photoelectric conversion section of the image pickup tube, and a signal generation pattern provided in the vicinity of the horizontal start end and the end of the photoelectric conversion section of the image pickup tube, respectively, for image pickup. Means for detecting the phase information of each of the starting end index signal and the ending end index signal occurring in the output signal of the imaging tube, respectively, and the starting end occurring in the output signal of the imaging tube, respectively. means for obtaining initial phase information for each horizontal scanning period in electron beam scanning based on phase information of one of the index signal of the end index signal and the phase information of the end index signal; Frequency information in electron beam scanning is obtained based on the phase difference between the two index signals, which is obtained using the phase information of the starting end index signal and the phase information of the trailing end index signal, which are respectively generated in the output signal of the image pickup tube. an information signal obtained by reading out an information signal stored in a storage device using the initial phase information for each horizontal scanning period in the electron beam scanning and the frequency information in the electron beam scanning; Using one of the two signals, which is the output signal of the image pickup tube, as a reference, the change mode of the other signal on the time axis is made to match the change mode of the one signal on the time axis, which is the reference signal. A color imaging device comprising means for controlling the