JPH1146368A - Television camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the focus of a lens without being affected by visual errors by showing the maximum value of an outline correction signal of a prescribed hue on a viewfinder in a prescribed video area and then quantitatively showing the best point in the lens focus. SOLUTION: R, G and B signals outputted from a DSP circuit 8 are inputted to an outline correction circuit 12, and an outline correction signal 12a is inputted to the circuit 8 and also to a peak detection circuit 15. The circuit 15 outputs a maximum value according to the level change of the signal 12a to a CPU 16 as a peak signal 15a. The CPU 16 outputs a character generation signal 16a to a character generator 17, in response to the peak value shown by the signal 15a. The generator 17 outputs a character signal 17a in response to the signal 16a. The signal 17a is combined with a Y-signal and inputted to a peaking circuit 19 contained in a viewfinder 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a focus of an image pickup lens to the best point so that the focus of the image pickup lens is determined to be the best point. The present invention relates to a television camera device that quantitatively displays feature amounts on a viewfinder.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing an example of a block configuration of a television camera device according to the prior art, and means for displaying an amount relating to the best focus of an imaging lens on a viewfinder will be described.

FIG. 2 shows an image pickup lens 2 having a controllable focus, a color separation prism 3 and red (hereinafter referred to as R), green (hereinafter referred to as G), and blue (hereinafter referred to as B). ), Each imaging device, for example, C which is a solid-state imaging device.
1 shows a block configuration example of a color television camera device provided with CDs 1R, 1G, and 1B. FIG. 2 mainly shows a circuit for realizing the best focus display function.

In this television camera device, incident light from a subject that has passed through an imaging lens 2 having focus enters a color separation prism 3 and is divided into R, G, and B light components.
The color is separated into primary colors, R light is CCD1R, G light is CCD1
The G and B lights respectively enter the CCD 1B. Each CCD1
R, 1G and 1B photoelectrically convert the incident light of the three primary colors of R, G and B into video signals, respectively, and perform CDS (Correlated Doubling).
ble Sampling: Correlated double sampling) ・ LPF circuit 4
Output to

The CDS / LPF circuit 4 receives the input R,
The noise signal level due to thermal noise, 1 / f noise, and the like included in each of the G and B video signals is reduced, and the reduced R, G, and B video signals are output to the amplifier circuit 5. The amplification circuit 5 amplifies the input R, G, and B video signals and outputs the amplified video signals to the γ circuit 6. The pre-γ circuit 6 receives the predetermined levels of R, G,
B Each video signal is subjected to a predetermined gamma correction,
/ D conversion circuit 7.

The A / D conversion circuit 7 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 digital signals (DSP).
Processor: digital signal processing).
The DSP circuit 8 performs digital signal processing such as detail processing, gamma correction, masking, and hue detection on the input digital R, G, and B video signals, and outputs the resulting signals to the D / A conversion circuit 9.

The D / A conversion circuit 9 D / A converts the input digital R, G, B video signals subjected to digital signal processing, and converts the analog R, G, B video signals into an encoder circuit. Output to 10 The encoder circuit 10 performs matrix processing on the input analog R, G, and B video signals to generate and output a Y signal, an RY signal, and a BY signal.

On the other hand, the contour correction circuit 12 receives the R, G, and B video signals output from the DSP circuit 8 and outputs a contour correction signal 12a to the DSP circuit 8.

On the other hand, the character character generator 17 has a CPU
A character character signal 17a is generated and output based on the character character generation signal 16a output from the character signal generator 16a. The character signal 17a is combined with the Y signal and input to the peaking circuit 19 in the viewfinder 18. In the peaking circuit 19, the peaking signal generated according to the peaking frequency is superimposed on the Y signal in which the character character signal 16a is synthesized, and is output to the video amplifier 20. Thereafter, a Y signal, a peaking signal, and character characters are displayed on the CRT 21 of the viewfinder 18 based on the signal input to the video amplifier 20.

In this device, for example, when a certain subject is photographed, the focus of the lens is adjusted by the viewfinder 1.
8 is manually controlled to maximize the peaking signal displayed on the CRT 21. Here, since the presence or absence of the peaking signal amount displayed on the CRT 21 of the viewfinder 18 is left to visual determination, the focus state of the lens 2 is quantitatively correctly determined if there is an error in the determination. The focus cannot be set to the best point. As a result, the focus of the subject may shift in the output signal.

[0011]

In the above-mentioned prior art,
By displaying the best point of the lens focus of the television camera on the viewfinder as a peaking signal, the focus is controlled so that the peaking signal is visually at the maximum level.
There are cases where the focus cannot be set quantitatively to the best point.

In order to solve the above-mentioned drawback, the present invention displays the maximum value of a contour correction signal of a predetermined hue in a predetermined image area on a viewfinder and quantitatively displays the best lens focus point. An object of the present invention is to provide a television camera device capable of performing lens focus control without being affected by visual errors.

[0013]

In order to achieve the above object, a television camera device according to the present invention comprises at least an imaging lens having a controllable focus,
A color separation optical device that separates incident light into three color lights of red, green, and blue, and a plurality of image pickup elements that photoelectrically convert the three color lights of red, green, and blue output from each image pickup element and output a video signal And a contour correction circuit that outputs a contour correction signal from red, green, and blue signals, a combining circuit that combines a video signal and a character character signal, and a viewfinder that displays the video signal and the character character signal. By displaying the character character signal on the viewfinder according to the peak signal which is the maximum value of the contour correction signal of each of the red, green and blue video signals,
In a television camera device capable of adjusting the focus of a lens to the best point, a peak detection circuit that outputs a maximum value according to a level change of a contour correction signal as a peak signal, and outputs a character character corresponding to the peak signal And a character character generating circuit for displaying the character character signal on a view finder.

Further, the television camera device according to the present invention is an area designating circuit for designating a predetermined area by an area designating signal in the contour correcting signal from the contour correcting circuit and outputting a contour correcting signal of the designated area. And a hue adaptation circuit that compares the signal levels of the red, green, and blue video signals from the plurality of image sensors and outputs a calculated hue signal, and signals of the red, green, and blue video signals from the hue adaptation circuit A hue designating circuit that outputs a contour correction signal when a hue signal designated by a predetermined hue is compared with a hue signal calculated and a hue designation signal is compared with the hue signal designated by the hue designation signal, and the hue designation circuit is designated in the designated area. By displaying a character character signal corresponding to the peak signal corresponding to the maximum value of the contour correction signal of the hue on the viewfinder, the focus of the imaging lens can be minimized. It is obtained so as to retain such substantially constant focus control by quantitatively displaying the point.

As a result, the best lens focus point of the subject can be quantitatively displayed on the viewfinder, so that the focus can be controlled so that the focus of the subject becomes constant, and the focus can be maintained even if a foreign object is inserted in front of the subject. Does not change, the lens focus of the subject can be kept constant.

[0016]

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 a best focus value display circuit according to the present invention.
Note that, similarly to FIG. 2, the circuit relating to the display of the best focus point is mainly described, and the other components are omitted.

In FIG. 1, reference numeral 2 denotes an imaging lens having a controllable focus, and 3 denotes a color separation optical device which separates incident light from a subject incident on the imaging lens 2 into three primary colors of R, G, and B. , For example, a color separation prism, 1R, 1B,
1G is an image sensor, for example, a CCD, 1R is a CCD for photoelectrically converting R light, and 1G is a CC for photoelectrically converting G light.
D, 1B are CCD, CDS / LPF for photoelectrically converting B light
The circuit 4 reduces the noise signal level due to thermal noise, 1 / f noise, etc., contained in the input R, G, B video signals, and the reduced R, G, B video signals are sent to the amplifier circuit 5. Is output.

The amplifying circuit 5 amplifies the input R, G, B video signals and outputs them to the pre-γ circuit 6. Pre-γ circuit 6
Performs predetermined gamma correction on each of the input R, G, and B video signals, and outputs the resulting signals to the A / D conversion circuit 7. A / D
The conversion circuit 7 converts the input analog, gamma-corrected R, G, and B video signals into digital signals.
Output to SP circuit 8.

The DSP circuit receives the input digital R,
Detail processing, correction gamma correction,
Performs digital signal processing such as masking and hue detection,
It outputs to the D / A conversion circuit 9 and the contour correction signal 12.

The D / A conversion circuit 9 D / A converts the input digital R, G, B video signals subjected to digital signal processing, and converts the analog R, G, B video signals into an encoder circuit. Output to 10 The encoder circuit 10 performs matrix processing on the input analog R, G, and B video signals to generate and output a Y signal, an RY signal, and a BY signal.

On the other hand, the R, G, B output from the DSP 8
The signal is input to a contour correction circuit 12 and a contour correction signal 12a
Is input to the DSP circuit 8 and the peak detection circuit 1
5 is output. The peak detection circuit 15 outputs the maximum value according to the level change of the contour correction signal to the CPU 16 as a peak signal 15a. In the CPU 16, the peak signal 15
Character character generation signal 16 corresponding to the peak value indicated by a
a is output to the character character generator 17.

The character character generator 17 outputs a character character signal 17a corresponding to the character character generation signal 16a. The character signal 17a is combined with the Y signal and input to the peaking circuit 19 in the viewfinder 18. In the peaking circuit 19, the peaking signal is superimposed on the Y signal according to the peaking frequency, and the video amplifier 2
Output to 0. Then, the Y signal, the peaking signal and the character are displayed on the CRT 21 of the viewfinder 18 after being input to the video amplifier 20.

Next, another embodiment of the present invention will be described. In FIG. 3, an area designating circuit is added to FIG. In this figure, a contour correction circuit 12 outputs a contour correction signal 12a to a region specifying circuit 13. The area specifying circuit 13 outputs an area specifying signal 16 output from the CPU 16.
Only the contour correction signal 13a in the area designated by b is output.

As shown in FIG. 5, the area designating circuit 13 comprises counters 31, 32, a comparing circuit 33, flip-flops 35, 36, an AND circuit 37, and an analog switch circuit 38. A horizontal drive signal and a vertical drive signal are input as reset signals thereof, and a horizontal gate signal and a vertical gate signal are generated by an area designating signal from the CPU 16 and are converted into an analog switch signal through an AND circuit. Change the switch. By this switching, the contour correction signal of the designated area is output.

Further, another embodiment will be described. FIG. 4 is obtained by adding a hue application circuit and a hue designation circuit to FIG. In the area designating circuit 13, a hue designating circuit 14 outputs an outline correction signal 13a corresponding to the area designating signal 16b.
Output to On the other hand, the hue adaptation circuit 11 compares the signal levels of the red, green, and blue video signals output from the DSP 8 and outputs a calculated hue signal 11a. Hue designating circuit 14
When the hue designation signal 16c output from the CPU 16 matches the hue signal 11a output from the hue adaptation circuit 11, the contour correction signal 14a is output to the peak detection circuit 15.

The hue adaptation circuit 11 comprises a comparator 41, a subtractor 42, and a synthesis operation circuit 43 as shown in FIG. 6, and compares the R, G, and B video signals from the DSP circuit 8. , 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 a subtraction process of a signal value such that (intermediate value signal)-(minimum signal) = (complementary color signal) is performed, and further, a hue signal is calculated by a composite operation of the value of the primary color signal and the value of the complementary color signal and output Circuit.

As shown in FIG. 7, the hue designating circuit 14 comprises a comparator 51 and an analog switch 52. When the hue designating signal from the CPU 16 matches the hue signal from the hue adapting circuit, Analog switch 5
2 is a circuit for outputting a contour correction signal of a hue designated by a hue signal when the switch 2 is turned on. CPU1
6 forms a character character generation signal according to the peak signal corresponding to the maximum value of the contour correction signal output from the peak detector 15 and outputs the character character generation signal to the character character generation circuit 17.

The synthesizer 22 synthesizes the Y signal output from the encoder circuit 10 and the character signal output from the character character generation circuit, and outputs the synthesized signal to the peaking circuit 19 in the viewfinder 18. The peaking circuit 19 amplifies the peaking frequency component in the Y signal output from the encoder circuit 10, superimposes the peaking frequency component on the Y signal as a peaking signal, and outputs the signal to the video amplifier 20. The video amplifier 20 converts a signal obtained by combining the Y signal, the peaking signal, and the character signal output from the peaking circuit 19 into a signal that can be received by the CRT 21 and outputs the signal.

[0029]

According to the present invention, the function of quantitatively displaying the maximum value of the contour correction signal of the designated hue as the best point of the lens focus in the designated area on the viewfinder can be realized. Therefore, the lens iris can be easily controlled so that the focus of the subject becomes constant.

[Brief description of the drawings]

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

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

FIG. 3 is a diagram showing a block configuration of another embodiment of the television camera device according to the present invention.

FIG. 4 is a diagram showing a block configuration of still another embodiment of the television camera device according to the present invention.

FIG. 5 is a diagram showing an example of a block configuration of an area specifying circuit used in the television camera device according to the present invention.

FIG. 6 is a diagram showing an example of a block configuration of a hue application circuit used in the television camera device according to the present invention.

FIG. 7 is a diagram showing a block configuration of a hue specifying circuit used in the television camera device according to the present invention.

[Explanation of symbols]

1. imaging device, 2. imaging lens with focus 3. color separation optical device, 4. CDS circuit and LPF,
5. Amplifier 6. Pre-gamma circuit, 7. A / D converter,
8. DSP circuit 9. D / A converter, 10. Encoder circuit, 11.
・ Hue adaptation circuit 12 ・ ・ Contour correction circuit, 13 ・ ・ Area designation circuit, 14 ・
・ Hue specification circuit 15 ・ ・ Peak detection circuit, 16 ・ ・ CPU circuit, 17 ・
・ Character character generation circuit, 18 ・ ・ Viewfinder 19 ・ ・ Aperture circuit, 20 ・ ・ Video amplifier, 2
1. CRT, 22 Synthesizer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 5/232 H04N 9/09 A 9/09 G06F 15/64 325F

Claims (3)

[Claims] At least an imaging lens having a controllable focus, a color separation optical device for separating incident light into red, green, and blue light, and a photoelectric separation device for red, green, and blue light, respectively. A plurality of image sensors for converting and outputting video signals, an outline correction circuit for outputting an outline correction signal from red, green, and blue signals output from each of the image sensors, and an arithmetic processing device for outputting a character character generation signal And a character character generating circuit for outputting a character character, a synthesizing circuit for synthesizing a video signal and a character character signal, and a television camera device having a viewfinder for displaying the video signal and the character character signal. It has a peak detection circuit that outputs the maximum value according to the level change as a peak signal. A television camera device characterized by displaying a character character signal corresponding to a seek signal on a viewfinder. 2. The television camera device according to claim 1, wherein a predetermined area is specified by an area specifying signal in the outline correction signal from the outline correction circuit, and only the outline correction signal of the specified area is detected by the peak detection. A television camera device comprising an area designating circuit for outputting to a circuit, a character character signal corresponding to a peak signal corresponding to a maximum value of a contour correction signal of a designated area is displayed on a viewfinder. 3. A hue for outputting a hue signal obtained by comparing and calculating respective signal levels of red, green, and blue video signals from the plurality of image pickup devices according to the television camera device according to claim 2. A hue specifying circuit for outputting an outline correction signal when the hue signal and the hue specification signal match with the adaptation circuit, and a peak signal corresponding to the maximum value of the outline correction signal of the video signal of the specified area and the specified hue A television camera device characterized by displaying a character character signal corresponding to the image on a viewfinder.