JPH1079950A - Television camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television camera device which controls the iris of an image pickup lens by outputting an iris control signal corresponding to a luminance signal constituting a video signal and a hue signal from a CPU to make the luminance of hue that is designated in a designated area constant and makes the luminance of an object constant even when the background illuminance of a prescribed object is changed. SOLUTION: A television camera device which keeps the output level of a video signal almost constant by controlling an iris has an area designating circuit 14 which outputs a video signal of a designated area, a hue adapting circuit 16 which outputs a hue signal that is compared and operated and a hue designating circuit 15 which outputs a video signal of a designated area and a designated hue when the video signal of the designated area coincides with a signal which is acquired by comparing the hue signal that is compared and operated and designated hue data and keeps the output level of a video signal almost constant by controlling an iris by means of an iris control signal corresponding to the level changes of the designated area and designated hue.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera device, and more particularly, to a television camera device which is designed to prevent the luminance of a subject in an output image from changing even if the background illuminance of the subject changes during imaging.
The present invention relates to a television camera device that controls an iris of an imaging lens.

[0002]

2. Description of the Related Art Generally, a television camera device is provided with a control means for maintaining a video signal output level substantially constant even when an incident light amount changes due to a change in illuminance of a subject. As a control unit of the television camera device, a control unit for controlling an iris of an imaging lens, a control unit for controlling a gain of a video signal amplifying circuit, and the like have been put to practical use. The control means for controlling the iris of the imaging lens often includes a means for detecting a change in the video signal level due to a change in the amount of light incident on the television camera apparatus from the subject and automatically controlling the iris based on the detection signal. Have been.

FIG. 2 is a block diagram of a conventional television camera apparatus, and means for controlling an iris of an imaging lens will be described. FIG. 2 shows an imaging lens provided with a remotely controllable iris, a color separation prism, red (hereinafter, referred to as R), green (hereinafter, referred to as G), and blue (hereinafter, referred to as B). 1 is an example of a color television camera device provided with each imaging device for use, for example, a solid-state imaging device CCD. FIG. 2 mainly illustrates a circuit relating to iris control, and the other components are omitted. In a television camera device, incident light from a subject that has passed through an imaging lens 22 provided with an iris enters a color separation prism 23 and is separated into three primary colors of R, G, and B. Light is CCD21G, B
Light enters each of the CCDs 21B. Each CCD 21
R, 21G, and 21B photoelectrically convert the incident light of the three primary colors of R, G, and B into video signals, respectively, and perform multiple CDS (CoS) operations.
rrelated Double Sampling: Output to the LPF 24. Each CDS circuit / LPF24
Reduces thermal noise, 1 / f noise, and the like included in the input R, G, and B video signals, and outputs the reduced signals to a plurality of preamplifier circuits 25. Each preamplifier circuit 25 amplifies each of the input R, G, and B video signals with reduced noise to a predetermined level,
Output to a plurality of gain control amplifier circuits 26. Each of the gain control amplifier circuits 26 controls the gain of the input predetermined R, G, B video signals so that the required levels of R, G, B video signals are obtained, and provides a plurality of pre-γ circuits 27 and a NAM circuit. 31 and output.

On the other hand, each pre-γ circuit 27 performs a predetermined gamma correction on each of the input R, G, and B video signals of a required level, and outputs the resulting signals to a plurality of A / D conversion circuits 28. Each A / D conversion circuit 28 converts the input R, G, and B video signals, which have been subjected to predetermined gamma correction, from analog signals to digital signals, and converts the signals into a plurality of DSPs (Digital Signal Processors).
ssor: digital signal processing). Each D
The SP circuit 29 applies detail correction, gamma correction, masking, and the like to the input digital R, G, and B video signals.
It performs digital signal processing such as hue detection and outputs the result to a plurality of D / A conversion circuits 30. Each D / A conversion circuit 30 receives digital R, G,
The B video signals are converted to analog R, G, and B video signals and output.

The other NAM circuit 31 performs non-additive mixing of the input required R, G, and B video signals, and
Among the R, G, and B video signals, a video signal whose signal level is only the maximum value is formed, and the V SAW / HPARA circuit 32
Output to The V SAW / HPARA circuit 32 weights a video signal having an input signal level of only the maximum value with a sawtooth waveform in the vertical direction and a parabolic waveform in the horizontal direction, and outputs the weighted signal to the CPU (control circuit) 33. CPU33
Forms an iris control signal corresponding to the input video signal with the required weighting, and outputs it to the iris of the imaging lens 4. At this time, the CPU 33 sets the V SAW /
The imaging lens 2 is controlled so that the signal level of the required weighted video signal output from the HPARA circuit 32 is constant.
The iris of the camera 2 is controlled to adjust the amount of incident light from the subject.

In this television camera device, for example, when an image of a certain subject is picked up, the iris of the image pickup lens is generated by R, G, and B video signals generated by the illuminance of incident light from both the subject portion and the background portion. Is determined by the signal level of the video signal that has been subjected to the non-additive mixing. Therefore, for example, the illuminance of the subject does not change,
When the illuminance of the background portion increases, the signal level of the video signal subjected to the non-additive mixing increases. In this case, the CPU 33 sends the V SAW / H PARA circuit 32
The iris control signal is output so that the signal level of the video signal with the required weight outputted by the camera becomes constant, and the iris of the imaging lens is squeezed. As a result,
If the background illuminance increases compared to before the increase,
A video signal in which the luminance level of the subject portion is further reduced is output from the television camera device.

[0007]

In a television camera device according to the prior art, an iris of an imaging lens is controlled by an iris control signal output from a CPU so that a video signal output from a NAM circuit becomes a constant level. Therefore, for example, when a person's face is imaged as a subject and the background becomes bright, the video signal level output from the NAM circuit increases. Therefore, the CPU controls to reduce the iris in order to lower the level of the video signal output from the NAM circuit. As a result, there is a disadvantage that a person's face becomes dark. The present invention, in order to solve the above drawbacks, so that the luminance of the specified hue is constant in the specified area,
An iris control signal corresponding to a luminance signal and a hue signal constituting the video signal is output from the CPU to control the iris of the imaging lens. An object of the present invention is to provide a television camera device in which luminance does not change.

[0008]

In order to achieve the above object, a television camera device according to the present invention comprises:
An imaging lens with an iris that can be controlled remotely, a color separation optical device that separates incident light into red, green, and blue light, and a photoelectric signal that converts each of red, green, and blue light into a video signal A plurality of image sensors, a NAM circuit that performs non-additive mixing of red, green, and blue video signals and outputs a video signal having a maximum signal level only, and a signal corresponding to a level change of a video signal having only a maximum value A control circuit that outputs an iris control signal to control the iris, and controls the iris of the imaging lens according to the level change of each of the red, green, and blue video signals so that the video signal output level is substantially constant In the television camera device, the required area is designated by the area designation signal to the video signal of only the maximum value from the NAM circuit, and the area signal for outputting the video signal of the designated area is designated. A circuit, a hue adaptation circuit that outputs a calculated hue signal by comparing the signal levels of the red, green, and blue video signals from the plurality of imaging elements, and a video signal of a specified area from the area specifying circuit, When the signal obtained by comparing the hue data designated by the hue signal and the hue designation signal calculated by comparing the signal levels of the red, green, and blue video signals from the hue adaptation circuit matches, A designated area according to the level change of the video signal of only the maximum value,
A hue specifying circuit for outputting a video signal of a specified hue, wherein the imaging lens is controlled by an iris control signal corresponding to a specified area of the video signal of only the maximum value from the NAM circuit and a level change of the specified hue. The iris provided is controlled to keep the video signal output level substantially constant.

The operation of the present invention will be described. In the television camera device of the present invention,
In the video signal of only the maximum value from the NAM circuit, a required area is designated by an area designation signal, and a video signal of the designated area is output. In the hue adaptation circuit, red, green, A hue signal calculated by comparing the signal levels of the blue video signals is output, and in the hue specifying circuit, the video signal of the specified area from the area specifying circuit and the red, green, and blue video signals from the hue adapting circuit are output. When the hue signal calculated by comparing the signal level of the signal and the signal obtained by comparing the hue data specifying the required hue with the hue specification signal match, the specification according to the level change of the video signal of only the maximum value A video signal of a specified hue is output, and the imaging lens is output by an iris control signal according to a change in the level of the specified hue, in a specified area of a video signal of only the maximum value from the NAM circuit. Held substantially constant video signal output level to control the iris with the.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television camera device according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a television camera device having an iris control circuit corresponding to a luminance signal and a hue signal according to the present invention. FIG. 1 mainly illustrates a circuit relating to iris control, and the other components are omitted. In FIG. 1, reference numeral 2 denotes an imaging lens having an iris that can be remotely controlled, and 3 denotes a color separation optical device that separates incident light from a subject incident from the imaging lens 2 into R, G, and B primary colors, for example, color separation. Prism, 1 denotes a plurality of image sensors, for example, a plurality of CCDs, 1R denotes a CCD that photoelectrically converts R light, 1G denotes a CCD that photoelectrically converts G light, 1
B is a CCD for photoelectrically converting B light, 4 is a CCD 1R, 1
A plurality of CDS circuits and LPFs 5 for removing noise of R, G, and B video signals output from G and 1B are used to reduce the R, G, and B video signals input from each CDS circuit / LPF 4 to a predetermined level. A plurality of preamplifier circuits 6 for amplifying a plurality of gain control amplifier circuits for amplifying and controlling each of the predetermined levels of R, G, B video signals inputted from each preamplifier circuit 5 to a required level, and 7 a respective gain control amplifier circuit A plurality of pre-γ circuits for performing predetermined gamma correction on each video signal inputted from 6;
Are a plurality of A / D conversion circuits for converting each analog video signal inputted from each pre-γ circuit 7 into each digital video signal, and 9 are each digital video signal inputted from each A / D conversion circuit 8. For multiple digital signal processing such as detail correction, gamma correction, masking, hue detection, etc.
SP circuits 10 are a plurality of D / A conversion circuits for converting each digital video signal inputted from each DSP circuit 9 into each analog video signal, and 11 is each video signal inputted from each gain control amplification circuit 6 NAM circuit that performs non-additive mixing of
Reference numeral 12 denotes a V SAW / HPARA for weighting the video signal input from the NAM circuit 11 in the horizontal and vertical directions.
An area designating circuit 14 for performing an area designation by a region designation signal from the CPU 13 on the weighted video signal input from the V SAW / HPARA circuit 12 and using the area as a designated weighted video signal; Each DSP
A hue adaptation circuit 15 which performs an operation in accordance with the signal level of each digital video signal inputted from the circuit 9 to generate a hue signal; 15 a video signal inputted from the area designating circuit 14 and a hue inputted from the hue adaptation circuit 16 Signals and CP
A hue specifying circuit for generating a video signal whose area and hue are specified by the hue specifying signal from U13, and a CPU 13 for outputting an iris control signal corresponding to the video signal input from the hue specifying circuit.

In a television camera device, incident light from a subject passing through an imaging lens 2 having an iris that can be controlled remotely enters a color separation prism 3,
The light is separated into three primary colors of R, G, and B, and the R light is CCD1R,
The G light enters the CCD 1G and the B light enters the CCD 1B. Each of the CCDs 1R, 1G, and 1B receives incident R, G, and B
Performs photoelectric conversion of each of the three primary colors of light into a video signal,
The R, G, and B video signals are output to a plurality of CDS circuits / LPFs 4. Each CDS circuit / LPF4 receives the input R,
The thermal noise, 1 / f noise, and the like included in each of the G and B video signals are reduced and output to a plurality of preamplifier circuits 5. Each preamplifier circuit 5 amplifies the input R, G, and B video signals with reduced noise to a predetermined level, and outputs predetermined levels of R, G, and B video signals to a plurality of gain control amplifier circuits 6. I do. Each gain control amplifier circuit 6 controls the gain of the inputted R, G, B video signal of a predetermined level, and amplifies the R, G, B video signal amplified to a required level into a plurality of pre-γ circuits 7 and a NAM circuit 11. Output to

Each of the pre-γ circuits 7 performs a predetermined gamma correction on the input R, G, and B video signals of a required level, and converts the gamma-corrected R, G, and B video signals into a plurality of video signals. Output to the A / D conversion circuit 8. Each A / D conversion circuit 8 converts the input analog, gamma-corrected R, G, and B video signals into digital signals, and converts the digital R, G, and B video signals to a plurality of DSP circuits 9. Output. Each DSP circuit 9 performs digital signal processing such as detail correction, gamma correction, masking, and hue detection on the input digital R, G, and B video signals, and performs R, G, and B digital signal processing. A plurality of D / A conversion circuits 10 and a hue adaptation circuit 1
Output to 6. Each D / A conversion circuit 10 converts the input R, G, and B video signals that have been subjected to the digital signal processing into analog signals, and outputs the analog R, G, and B video signals to other circuits. .

The other NAM circuit 11 performs non-additive mixing of the input required R, G, and B video signals, and
A video signal whose signal level is only the maximum value among R, G, and B video signals (hereinafter, referred to as a NAM1 signal) is formed,
The NAM1 signal is output to the V SAW / HPARA circuit 12. The V SAW / HPARA circuit 12 receives the input N
The required weighting is performed by a sawtooth waveform in the vertical direction of the AM1 signal and a parabolic waveform in the horizontal direction, and the weighted N
The AM1 signal is output to the area specifying circuit 14. The area designating circuit 14 adds CW to the input weighted NAM1 signal.
The area is specified by an area specifying signal that specifies a required area of the image separately input from the PU 13, and the NAM1 signal of only the specified area is output to the hue specifying circuit 15. In addition,
As shown in FIG. 3, the area specifying circuit 14 includes counters 51 and 52, comparing circuits 53 and 54, flip-flops 55 and 56, an adding circuit 57, and an AND circuit 58. A horizontal drive signal and a vertical drive signal are input as a reset signal, a horizontal gate signal and a vertical gate signal are generated by an area designating signal from the CPU 13, added to form a gate signal, and a video signal (NA
M1 signal) and outputs a video signal of a designated area.

The hue designating circuit 15 calculates a hue data value based on the input NAM1 signal of only the designated area, a hue designating signal inputted by designating a required hue by the CPU 13 separately, and a hue signal calculated and inputted by the hue adapting circuit 16. A NAM1 signal (hereinafter, referred to as a NAM2 signal) is output to the CPU 13 only when the comparison value obtained by comparing the hue values obtained by the above-described methods matches each other. Note that the hue adaptation circuit 16 is configured as shown in FIG.
It comprises a comparator 61, a subtraction circuit 62, and a synthesis operation circuit 63. The R, G, and B video signals from the DSP circuit 9 are compared, and a color signal having a maximum value, an intermediate value, and a minimum value is extracted. And (maximum value signal) − (intermediate value signal) = (primary color signal)
And (intermediate value signal) − (minimum value signal) = (complementary color signal)
, And calculates and outputs a hue signal by a combination operation of the value of the primary color signal and the value of the complementary color signal. The hue specifying circuit 15
As shown in FIG. 5, a comparator 71 and an AND circuit 72 are provided. This circuit ANDs the NAM1 signal of only the designated area from the designation circuit 14 and outputs a NAM2 signal of the hue designated by the hue signal. The CPU 13 forms an iris control signal according to the input NAM2 signal, and outputs the iris control signal to a remotely controllable iris of the imaging lens 2. At this time, CPU
Reference numeral 13 controls the iris of the imaging lens 2 so that the signal level of the NAM2 signal output from the hue specifying circuit 15 becomes constant, and adjusts the amount of incident light.

[0015]

According to the present invention, an iris control signal corresponding to a luminance signal and a hue signal constituting a video signal is output from a CPU so that the luminance of a designated hue is constant in a designated area. In addition, it is possible to provide a television camera apparatus in which the iris of the imaging lens is controlled so that the luminance of the subject does not change even when the illuminance of the background of the predetermined subject changes.

[Brief description of the drawings]

FIG. 1 is a block diagram of a television camera device according to the present invention.

FIG. 2 is a block diagram of a television camera device according to the related art.

FIG. 3 is a block diagram of an area specifying circuit used in the television camera device according to the present invention.

FIG. 4 is a block diagram of a hue adaptation circuit used in the television camera device according to the present invention.

FIG. 5 is a block diagram of a hue specifying circuit used in the television camera device according to the present invention.

[Explanation of symbols]

1, 21: imaging element, 2, 22: imaging lens with iris, 3, 23: color separation optical device, 4, 24: CDS
Circuit / LPF, 5, 25: Preamplifier circuit, 26: Gain control amplifier circuit, 7, 27: Pre-gamma circuit, 8, 28: A /
D conversion circuit, 9, 29 ... DSP circuit, 10, 30, ... D /
A conversion circuit, 11, 31,... NAM circuit, 12, 32,.
SAW / H PARA circuit, 13, 33 CPU, 14
... Area designating circuit, 15 ... Hue designating circuit, 16 ... Hue adapting circuit, 51, 52 ... Counter, 53,54,61,71
... comparison circuit, 55, 56 ... flip-flop, 57 ... addition circuit, 58, 72 ... AND circuit, 62 ... subtraction circuit, 6
3. Synthesis operation circuit.

Claims (3)

[Claims] At least an imaging lens having an iris that can be controlled remotely, a color separation optical device that separates incident light into three color lights of red, green, and blue, and three color lights of red, green, and blue, respectively A plurality of image pickup elements for performing photoelectric conversion and outputting video signals, a NAM circuit for performing non-additive mixing of red, green, and blue video signals and outputting a video signal having only a maximum signal level;
A control circuit that outputs an iris control signal by a signal corresponding to a level change of the video signal of only the maximum value and controls the iris, and the imaging lens is provided according to a level change of each of red, green, and blue video signals. In the television camera device which controls the iris to keep the video signal output level substantially constant, the video signal of only the maximum value from the NAM circuit specifies a required area by an area specifying signal, and specifies the area. An area designating circuit that outputs a video signal of the selected area; a hue adaptation circuit that outputs a calculated hue signal by comparing signal levels of red, green, and blue video signals from the plurality of imaging devices; and the area designating circuit. The hue signal and the hue designation signal calculated by comparing the signal levels of the red, green, and blue video signals from the hue adaptation circuit with the video signal of the designated area from A hue specification circuit that outputs a video signal of a specified hue and a specified area according to a level change of a video signal of only the maximum value when a signal obtained by comparing hue data specifying a phase matches. The iris included in the imaging lens is controlled by an iris control signal corresponding to a specified area of a video signal having only the maximum value from the NAM circuit and a level change of a specified hue to make the video signal output level substantially constant. A television camera device characterized in that it is held. 2. The counter according to claim 1, wherein the area designating circuit resets the clock signal with a horizontal drive signal and outputs a counted clock signal, and resets and counts the clock signal with a vertical drive signal. A counter that outputs a clock signal; a comparator circuit that compares the clock signal reset and counted by the horizontal drive signal with the area designation signal and outputs a horizontal set signal; a clock signal that is reset and counted by the vertical drive signal and an area A comparison circuit that compares with a designated signal and outputs a vertical set signal, a flip-flop that sets with a horizontal set signal and resets with a region designation signal and outputs a horizontal gate signal, and a flip-flop that is set with a vertical set signal and designated with a region designation signal A flip-flop that resets and outputs a vertical gate signal, and a horizontal gate signal and a vertical gate signal And an AND circuit that gates the video signal of only the maximum value with the gate signal and outputs a video signal of a specified area. Television camera device. 3. A hue specification circuit according to claim 1, wherein the hue specification circuit compares the signal levels of the red, green, and blue video signals and calculates the hue data by specifying the required hue by the hue specification signal. And a comparison circuit that outputs a specified hue signal, and an AND circuit that outputs a video signal of the specified area and the specified hue when the video signal of the specified area matches the specified hue signal. A television camera device, comprising: