JPH0117319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a color television camera (hereinafter referred to as
This relates to a self-diagnosis result display method that self-diagnoses the color balance, registration adjustment status, and malfunction of each part of a camera (camera), and then displays the result on a video monitor such as a viewfinder as a numerical value converted into a unit that can be determined. be.

In conventional cameras with automatic adjustment function, when the adjustment error is outside the allowable range or when a failure occurs in any part, this is indicated by lighting up an indicator light, etc., and the adjustment error is detected. It is not possible to know the degree of damage and failure status in concrete numbers, and in order to know the concrete numbers, measurements must be performed using various measuring instruments, so it is necessary to prepare a large number of expensive measuring instruments. In addition, it requires time and effort to measure, and has disadvantages such as the inability to immediately obtain specific numerical values.

In the present invention, the camera itself performs self-diagnosis, and the error value obtained as a result is converted into a unit that can be determined and then displayed as characters on the video monitor, and the error value is automatically converted into a specific numerical value. The present invention provides an extremely effective method for displaying self-diagnosis results for a color television camera, in which results equivalent to those obtained by incorporating a measuring device into the camera can be obtained by displaying the results.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

FIG. 1 is a block diagram showing the related parts of the present invention, and shows the camera's color channels R (red), G (green), and B.
(blue) is selected by selector SEL ₁ , and then sent to the differential amplifier DA via selector SEL ₂ .
At the same time, only the color channel G is also applied to the other input of the differential amplifier DA via the selector _SEL3 .

Furthermore, from each video amplifier in the camera, the output levels L ₁ to _{L o} of each part are given to the selector SEL ₄ , and the voltages V ₁ to V _o and control pulse P of each part are also given to the selector SEL ₄ . These are individually selected by selector SEL ₄ , and
It is applied to one input of the differential amplifier DA via the selector _SEL2 .

Note that depending on selector SEL ₃ , the processor
A reference signal S _S indicating a reference value from the CPU is selected,
This is applied to the other input of the differential amplifier DA.

Therefore, selectors SEL ₁ to SEL ₄ are
Differential amplifier is controlled by CPU as appropriate.
DA includes color channel G and reference signal S _S , color channel R or B and color channel G, and output level.
Each combination of L ₁ to L _o , voltages V ₁ to _{V o} , and control pulses P with the reference signal S _S is given, and a comparison with the reference signal S _S is performed, and the color channel S is set to the reference value. A comparison is made with the color channel R or B, the result of which is obtained as an error value from the output of the differential amplifier DA.

This error value is converted into a digital signal by an analog-to-digital converter (hereinafter referred to as ADC) and then given to a processor CPU such as a microprocessor, which responds to instructions stored in advance in a fixed memory ROM. Processor CPU
As a result of the operation, each error value is sequentially stored in the variable memory RAM.

The processor CPU stores each error value in variable memory.
After sequentially reading data from RAM, calculations are performed according to the type of error, and each error value is converted into a unit that can be determined artificially, similar to when actually measured with a measuring instrument, and the result is determined in advance. After determining whether it is within the specified tolerance range, a signal indicating the value converted into a unit that can be determined is given to the character generator CG, which generates a character signal indicating the error value in the measurement unit. , and send it to the mixer MIX.

The mixer MIX receives the video signal S _V to be monitored.
A video monitor VM such as a viewfinder or the like is provided with the two mixed together.

Therefore, the video signal is detected by the video monitor VM.
The _SV image is displayed, and each error value detected through self-diagnosis is displayed as a number along with a symbol indicating the unit of judgment and a symbol indicating the type of error.

FIG. 2 is a flowchart showing the control and calculation operations of the processor CPU. After "START", the color channel first enters "G detection mode".
After selecting YES for “G detection mode?” selector SEL ₁ ~
Send control signal to SEL ₃ “SEL ₁ -G, SEL ₂ -
G, SEL ₃ - _{S S} selection" and the reference signal S _S corresponding to the video signal level of color channel G.
After sampling the level of the part corresponding to the detection point from the video signal of color channel G by "detection point sampling of registration and color balance error value",
ADC “Stores A/D output to RAM”.

For sampling, use selector SEL ₁ or
This is done by turning SEL ₂ on or off or by selecting the input acceptance point of the processor CPU.

If you execute "G detection mode" as above,
After YES for “G detection mode?”, the color channel becomes “R detection mode” and “G detection mode?” “NO”
sends out a control signal through the selector, and now the selector
Double control SEL ₁ and “SEL ₁ ―R _pr B, SEL ₁ ―
The video signal level of color channel R is compared with color channel G as a reference, and after "detection point sampling of registration and color balance error value" is performed, ADC "A/
Store the D output in RAM and execute "R detection mode".

Next, select NO and “R” for “G detection mode?”
Detection mode? Color channel “B” through “YES”
Shift to "detection mode", compare the video signal level of color channel B with respect to color channel G as described above, and then select ADC "store A/D output to RAM".
This will end the registration and color balance self-diagnosis.

However, each of the above operations is performed on the premise that a standard pattern is imaged by a camera or a standard pattern provided in a lens system of a camera is imaged.
“G detection mode?” and “R detection mode?”
If NO, the mode shifts to "failure detection mode" and all selectors SEL ₁ are turned off, control signals are sent to selectors SEL ₂ to _{SEL 4} , and "SEL ₂ -
SEL ₄ , SEL ₃ -S _S selection" and "SEL ₄ -L ₁ ~P
"successive selection" is performed, and a reference signal S _S of a value corresponding to the successive selection of selector SEL ₄ is sent out.

For this reason, the output levels L ₁ to L _o , voltages V ₁ to _{V o} , and the peak values or phase values of the control pulse P are successively compared with the corresponding reference signal S _S , and the “fault detection point sampling”
The time-lapse portion that is particularly noteworthy is extracted, and the ADC “A/D output” is adjusted accordingly.
"Storing to RAM" is performed.

Also, since the above operations are performed sequentially for output level L ₁ to control pulse P, "proceeding the detection mode to the next" is done via NO in "End all detection modes?", and the detection of control pulse P When this is completed, "End all detection mode?" becomes YES, and the process moves to the calculation of "converting the contents stored in the RAM into μsec or %" in the variable memory, thereby converting into the unit of determination.

The conversion result is given to the character generator CG by "select conversion value to CG" and converted into a character signal, which is displayed on the video monitor VM as described above.

Therefore, the registration and color balance adjustment error values between each color channel R, G, and B are displayed as numerical values in the judgment unit, and each signal such as the output level L ₁ to _{Lo and} the control pulse P, Since the error value between each voltage such as voltage V ₁ to V _o and the reference value is displayed as a percentage, you can immediately know the diagnostic results of each part inside the camera numerically without using a measuring device, and also check the status of this. can be judged.

However, in addition to the time difference μsec and deviation rate %, the displayed units are voltage value V, phase angle rad or degrees,
The present invention can be modified in various ways, such as using a comparator or a subtracter in place of the differential amplifier DA, and the configuration of each diagram can be arbitrarily selected depending on the conditions. It is free.

As is clear from the above explanation, according to the present invention, the operating status and adjustment status of each part of the camera are immediately and automatically displayed as numerical values with units without using a measuring instrument. Required equipment investment and measurement effort are omitted, and remarkable effects can be obtained in cameras for various uses.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the processor in FIG. SEL ₁ to SEL ₄ ...Selector, DA...Differential amplifier,
A/D...ADC (analog-digital converter),
CPU...Processor, CG...Character generator, VM...Video monitor.

Claims (1)

[Claims] 1. Compare the output of each color channel of the color television camera and the signals and voltages of each part with a reference value to obtain an error value, convert it into a digital signal, and convert the error value into a unit that can be determined based on the digital signal. and then convert it to a character signal,
A self-diagnosis result display method for a color television camera, characterized in that the character signal is applied to a video monitor and displayed.