JP4673130B2 - TV camera equipment - Google Patents

Description

  The present invention relates to a television camera apparatus, and more particularly to a television camera apparatus provided with an automatic focus system that is not affected by flicker.

  When imaging a subject using a television camera device, it is necessary to adjust the focal length of the lens system of the television camera device. In broadcast and commercial television camera devices, cameramen often make manual adjustments themselves, but for industrial and consumer applications, many autofocus systems that automate focal length adjustments have been announced. This method will be described with reference to FIG.

  FIG. 7 is a block diagram showing a schematic configuration of an autofocus system of the television camera apparatus. In FIG. 7, reference numeral 701 denotes an optical system of a television camera device, and 703 denotes an imaging unit configured by a sensor such as a CCD (Charge Coupled Device), for example, and light 702 from a subject is transmitted through the optical system 701. An image is formed on the imaging unit 703. Needless to say, the imaging unit may be for a monochrome image or a color image. In addition, a single-plate imaging unit or a three-plate imaging unit can be used as the color image imaging unit.

  Reference numeral 704 denotes a signal processing unit. An optical image from a subject is converted into a video signal by the imaging unit 703, and this video signal is supplied to the signal processing unit 704. Here, luminance necessary for transmission of the subsequent video signal is obtained. It is separated into a signal and a color signal and output from an output terminal 705. It is also possible to display a subject image by connecting to a monitor device (not shown).

  On the other hand, the video signal from the imaging unit 703 is supplied to the focus control signal generation unit 706. The focus control signal generation unit 706 includes a filter 707 and a calculation unit 708. The filter 707 is composed of a band-pass filter (band filter) or a high-pass filter (high-pass component passing filter), extracts a high-frequency component of the luminance signal from the video signal from the imaging unit 703, and calculates the extracted high-frequency component. Part 708. The arithmetic unit 708 integrates the high frequency component of the luminance signal, generates a control signal for adjusting the focal length of the optical system 701 from the integrated value, and supplies the control signal to the control unit 709. The control unit 709 drives the optical system driving unit 710 based on the control signal for adjusting the focal length, drives the optical system 701 so that the optical image from the subject is just in focus on the imaging unit 703, and the focus adjustment is performed. Made.

  Here, the operation of the focus control signal generator 706 will be described with reference to FIG. FIG. 8 schematically shows, for example, a signal waveform obtained by passing the luminance signal of the edge portion of the subject through the band-pass filter 707. FIG. 8A shows a signal when the optical image from the subject is just focused on the image pickup unit 703. The amplitude M1 of the signal in this case is integrated by the calculation unit 708, and the integrated value of the value is , Become the maximum. FIG. 8B shows a so-called blurred state where an optical image from a subject is formed on the imaging unit 703 but is not in focus. A value obtained by integrating the amplitude M2 of the signal in this case by the calculation unit 708 is smaller than the amplitude M1. The amplitude M2 varies according to the focus (focus) when an optical image from the subject is projected onto the imaging unit 703. Therefore, the control unit 709 controls the optical system driving unit 710 based on the control signal from the focus control signal generation unit 706 and adjusts the optical system 701 so that the integrated value of the amplitude M2 approaches the integrated value of the amplitude M1. In addition, the auto focus of the TV camera device is realized by feedback control.

  However, television camera devices having such an autofocus function often image a subject in a place where various illuminations are performed. In such a case, illumination light that periodically changes is mixed into the video signal. Flicker phenomenon occurs. This flicker phenomenon greatly affects the convergence of the autofocus function or the accuracy of the autofocus function, which is a problem for the photographing of surveillance cameras and inspection devices.

  Hereinafter, the flicker phenomenon (hereinafter referred to as flicker) will be described with reference to FIGS. When the signal passing through the bandpass filter 707 is integrated by the arithmetic unit 708 as described with reference to FIG. 7, the level of the high-frequency component extracted using the bandpass filter 707 is small, and is affected by flicker caused by a fluorescent lamp, for example. Cheap. When the frequency of the power source of the fluorescent lamp is 50 Hz, the amount of light varies at 100 Hz. FIG. 9 shows this state. In FIG. 9, the vertical axis represents amplitude and the horizontal axis represents frequency. The DC component indicates a DC component that changes in a slow control loop of autofocus, and a signal of 100 Hz indicates a change in light amount when the frequency of the power source of the fluorescent lamp is 50 Hz.

  On the other hand, the field frequency in the television camera device changes at 60 fields / second, that is, 60 Hz in the NTSC system, for example. In this case, the field frequency of 60 fields / second and the light quantity change period of the fluorescent lamp of 100 Hz coincide with each other in increments of 20 Hz. This 20 Hz component is called a flicker component. Considering this in the frequency domain, as shown in FIG. 10, since a 100 Hz signal is sampled at 60 Hz, the 200 Hz folded 20 Hz including the 100 Hz folded 200 Hz folded and the 100 Hz folded 40 Hz folded. Ingredients are generated. FIG. 11 is a diagram for explaining the occurrence of the flicker described above. When the power supply frequency of the fluorescent lamp is 50 Hz as shown in FIG. 11A, the change in the light quantity of the fluorescent lamp is shown in FIG. As shown in B), the frequency is 100 Hz. When the field frequency in the TV camera device is, for example, the NTSC system, the luminance signal level changes every field (16.67 ms) as shown in FIG. 11C, so the change cycle is every 20 Hz, that is, , And an integer multiple of 20 Hz. This is the flicker component.

If there is a flicker component, the focus evaluation value is modulated by the flicker component.
For example, when measuring the focus evaluation value with the focus position fixed and integrating the high frequency component, if there is no motion in the image, there is no problem if the evaluation value is constant, but actually there is flicker due to fluorescent lamps The evaluation value varies depending on the flicker component. The fluctuation component due to the flicker adversely affects the focus convergence and accuracy.

  In addition, a television camera (see, for example, Patent Document 1) describes a technique for obtaining a video signal for performing an autofocus operation with high accuracy.

JP 2001-245198 A

  TV camera devices with an autofocus function often image a subject in a place where various types of illumination are performed. In such a case, flicker from periodically changing illumination light is mixed into the video signal, and The convergence of the focus function or the accuracy of the autofocus function may be greatly affected.

  An object of the present invention is to provide a television camera apparatus that can image a subject without being affected by illumination light of the subject.

  Another object of the present invention is to provide a television camera device with high focus accuracy and focus accuracy of an automatic focus system.

Still another object of the present invention is to provide a television camera apparatus including an automatic focusing system that eliminates flicker caused by illumination light of a subject.

  The television camera device of the present invention includes an optical system, an optical system driving unit that adjusts the focus of the optical system, an imaging unit that converts incident light from the optical system into a video signal, and a video signal from the imaging unit. A signal processing unit that appropriately processes, a focus control signal generation unit that receives a focus video signal from a video signal from the imaging unit, and the optical system based on the focus control signal that is output from the focus control signal generation unit A control unit that controls the drive unit, and when the periodic light amount change is superimposed on the incident light, the focus control signal output from the focus control signal generation unit is based on the periodic light amount change. Thus, it is configured to output via a low-pass filter that removes the flicker component superimposed on the focus control signal.

  In the television camera device of the present invention, when a periodic light amount change is superimposed on the incident light, a flicker component based on the periodic light amount change is calculated in advance, and the low-pass filter is calculated as the calculated flicker. A low-pass filter having a component as a cutoff frequency is configured.

  Further, in the television camera device of the present invention, a signal average calculation unit that calculates an average value of the focus video signal among the video signals from the imaging unit, an output of the signal average calculation unit, and a signal average calculation unit An amplitude calculation unit that calculates a difference between a maximum value and a minimum value between an output and an output that is output via the low-pass filter, and a control unit that controls characteristics of the low-pass filter based on the output of the amplitude calculation unit And a control unit that controls the characteristics of the low-pass filter controls the low-pass filter so that the output of the amplitude calculation unit is maximized. Configured as follows.

  In the television camera device of the present invention, a threshold value is provided for the fluctuation amount of the output of the amplitude calculation unit, and the control unit is configured to provide the low-pass filter so that the fluctuation amount of the output of the amplitude calculation unit is equal to or less than the threshold value. Configured to control the characteristics of the.

  Furthermore, the television camera device of the present invention has a selection unit that switches between the output from the focus control signal generation unit and the output from the signal average calculation unit, and the imaging unit captures a subject without a predetermined movement. In this case, the selection unit selects the output from the signal average calculation unit and outputs it to the low-pass filter, and the subtraction unit outputs the output of the signal average calculation unit and the output of the signal average calculation unit to the low-pass filter. The difference between the maximum value and the minimum value output from the output through the filter is calculated, and the characteristics of the low-pass filter are controlled so that the output of the amplitude calculation unit is maximized. When the moving subject is photographed, the selection unit selects a signal from the focus control signal generation unit, and controls the optical system drive unit via the low-pass filter. Configured to feed.

  As described above, according to the present invention, a television camera apparatus including an autofocus system that eliminates flicker from periodically changing illumination light that significantly affects the convergence of the autofocus function or the accuracy of the autofocus function. Can be realized. Therefore, the subject can be imaged without being influenced by the illumination light of the subject, and there is a feature that a television camera device with high focus accuracy and high focus accuracy can be realized.

  FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention. In FIG. 1, 101 is a signal average calculation unit, 102 is a selection unit, 103 is a low-pass filter, 104 is a subtraction unit, 105 is an amplitude calculation unit, 106 is a control unit, 107 is an operation unit, and 108. The selection unit and 109 are a focus video signal generation unit. In addition, the same code | symbol is attached | subjected to the same thing as FIG. The operation of the embodiment shown in FIG. 1 will be described below.

  First, video signal output will be described. An optical image from the subject is formed on the imaging unit 703 via the optical system 701. This optical image is converted into a video signal by the imaging unit 703, supplied to the signal processing unit 704, subjected to appropriate signal processing, and output from the output terminal 705. This is the same as that shown in FIG.

  As for the automatic focus system, the video signal from the imaging unit 703 is supplied to the filter 707 of the focus control signal generation unit 706 via the focus video signal generation unit 109 described later, and the high frequency component of the focus video signal is extracted. . The extracted high frequency component is supplied to the calculation unit 708, integrates the high frequency component of the focus video signal, generates a control signal for adjusting the focal length of the optical system 701 from the integrated value, and controls the control unit via the selection unit 108. 709. The control unit 709 drives the optical system driving unit 710 based on the control signal for adjusting the focal length, drives the optical system 701 so that the optical image from the subject is just in focus on the imaging unit 703, and the focus adjustment is performed. Made.

  Here, the focus video signal generation unit 109 will be described. First, the camera device includes a monochrome camera device and a color camera device. In the monochrome camera device, the video signal itself is used as the focus video signal. Further, in the color camera device, various focus video signals are used according to the use of the color camera device. The focus video signal generation unit 109 is for generating such a focus video signal. For example, in a camera device such as a home video, the Y signal of equation (1) is generated.

Y = 0.299R + 0.4869G + 0.114B (1)
Here, Y: luminance signal, R, G, and B represent red, green, and blue signal components, respectively.
In addition, in a camera device such as a high-definition camera, a Y signal as shown in equation (2) is generated.

Y = 0.212R + 0.7153G + 0.00723B (2)
On the other hand, in an industrial camera device such as a medical microscope or an inspection device, a color signal, for example, a color signal C as shown in the equations (3) to (5) is generated according to the use, not a luminance signal.

C = 0.5G + 0.25G + 0.25B (3)
C = 0.5G + 0.5R (4)
C = G (5)
Note that the luminance signal Y and the color signal C shown in the above (1) to (5) are examples, and the present invention is not limited thereto. Therefore, the luminance signal Y, the color signal C, and the video signal in the case of black and white used for generating the focus control signal are referred to as a focus video signal. Accordingly, the focus video signal generation unit 109 generates a focus video signal.

  The present invention relates to a flicker removal invention. As the focus video signal, the luminance signal Y and color signal C shown in the above (1) to (5), the video signal in the case of monochrome video, and the like are used. Although it can be used as a focus video signal, in the following description, a case where a luminance signal is used will be described. However, it goes without saying that the present invention is not limited to the case where the luminance signal is used.

  Next, an automatic focus system for removing flicker will be described. In this embodiment, the flicker component of the illumination light is detected in advance. For this purpose, the operator of the television camera apparatus first operates the operation unit 107 to select the terminal a of the selection unit 102 via the control unit 106, and the output of the signal average calculation unit 101 is low-passed via the selection unit 102. The data is supplied to the filter 103 and the subtracting unit 104. At this time, the selection unit 108 does not select any terminal, so that autofocus does not work. In addition, as a subject to be imaged by the sensor 703, a subject (not shown) that hardly moves is prepared and this subject is imaged. In addition, it is assumed that the subject is illuminated with periodically changing illumination light, for example, a fluorescent lamp. In this embodiment, the case where a fluorescent lamp is used as the illumination light that changes periodically will be described. However, the present invention is not limited to the fluorescent lamp, and any illumination light that changes periodically can be used. Needless to say, the present invention can be applied to illumination light.

  When the subject is imaged in this way, the above-described focus video signal is generated by the focus video signal generation unit 109 from the video signal of the subject image formed on the imaging unit 703 via the optical system 701, and the signal average calculation is performed. Supplied to the unit 101. The signal average calculation unit 101 calculates a field average value for the focus video signal from the focus video signal generation unit 109. If the illumination light is constant, for example, if it is illumination light such as an incandescent light source that does not change periodically, the subject to be imaged is an image of a subject with little movement as described above. Therefore, the output signal level from the signal average calculation unit 101 is constant. However, when the subject is illuminated with illumination light that changes periodically, the output signal level of the signal average calculation unit 101 changes as shown in FIG. In FIG. 2, the vertical axis indicates the signal level, and the horizontal axis indicates time. Since the video signal level, for example, the luminance signal level is obtained by capturing an image of a subject that hardly moves as described above, the average video level is substantially constant.

  However, as described above, the phosphor driven by the power source of 50 Hz changes in the light quantity at a cycle of 100 Hz, and is further sampled at the field frequency 60 Hz of the TV camera device. The flicker fluctuation component (shown in FIG. 2) is output. When this is displayed in the frequency domain, it is as shown in FIG. That is, the output signal of the signal average calculation unit 101 changes as an autofocus value in a slow control loop (the frequency is nearly 0), so-called DC component (reference light amount), and 20 Hz. And the 40 Hz component are added. Therefore, if the focus control signal modulated by this output signal (which is referred to as an evaluation value D (f)) is a spectrum (dotted arrow) before and after 20 Hz as a reference, in addition to the DC component D (f). The focus control signal has a spectrum (indicated by dotted arrows) before and after 40 Hz, and the original focus control signal, that is, the focus control evaluation value D (f) is not output accurately. This causes the accuracy of focus control to deteriorate.

  In the present invention, flicker components such as 20 Hz and 40 Hz components are removed, and a DC component D (f) for focusing is taken out. In this embodiment, for the sake of explanation, a known flicker component such as 20 Hz and 40 Hz will be described. However, the configuration of the present invention automatically measures the flicker component when the flicker component is unknown, This automatically sets the characteristics of the filter that removes components. In this embodiment, the NTSC system is described as an example, but the same applies to the PAL system and the SECAM system. This will be described in detail below. The output from the signal average calculation unit 101 is supplied to the low-pass filter 103 and the subtraction unit 104. Here, the low-pass filter 103 will be described.

  FIG. 4 is a block diagram showing a schematic configuration of an embodiment of the low-pass filter used in the present invention. In FIG. 4, reference numeral 401 denotes an input terminal to which the signal average value from the signal average calculation unit 101 is input. Z (+2), Z (+1),... Z (−2) are shift registers, and signals are sequentially shifted every sampling period (field period). Reference numerals 402, 403, and 407 denote multipliers, and K1... K3 denote filter coefficients. These filter coefficients are set by control signals from the control unit 106 that are input to terminals 404, 405, and 406, respectively. Is changed so that the filter characteristics can be changed. Reference numeral 408 denotes an output terminal which is connected to the terminal b of the subtraction unit 104 and the selection unit 108. Note that the low-pass filter shown in FIG. 4 has a total of five stages, two stages before and after Z (0), but may have a three-stage structure and a two-stage structure. Although the number of stages can be increased as much as possible, there is a drawback that the response time becomes slower as the number of stages is increased. When considering the removal of modulation components, the five-stage configuration shown in FIG. 4 is effective.

  FIG. 5 shows a characteristic curve f (w) indicating the characteristics of the low-pass filter shown in FIG. In FIG. 5, the vertical axis represents the gain, and the horizontal axis represents the frequency. For frequencies above 20 Hz, the gain is almost zero, that is, a low-pass filter having a cutoff frequency of 20 Hz. The output of the low-pass filter 103 is supplied to the subtraction unit 104. In the subtracting unit 104, the output of the low-pass filter, that is, the output of 20 Hz or less shown in FIG. 5 is subtracted from the signal average value from the signal average calculation unit 101 and becomes almost zero, but in the band of 20 Hz or more, the signal The signal average value component from the average calculation unit 101 is output and supplied to the amplitude calculation unit 105. In other words, the low-pass filter 103 and the subtracting unit 104 constitute a high-pass filter. As an output of the subtracting unit 104, a signal from which the DC component in FIG. 3 is removed, that is, a flicker component is supplied to the amplitude calculating unit 105. The

  The amplitude calculation unit 105 calculates the difference between the maximum value and the minimum value of the signal from the subtraction unit 104 and applies the signal to the control unit 106. This determines the optimum low-pass filter characteristics. The determination of the optimum low-pass filter characteristics will be described below. The control unit 106 controls band switching of the low-pass filter 103. As described above, the low-pass filter 103 shown in FIG. 4 has been described so that the characteristics of the low-pass filter can be changed by changing the filter coefficients K1 and K3. Therefore, the characteristics of the low-pass filter change when the set values of the filter coefficients K1... K3 are appropriately changed by the control signals from the control unit 106 input to the terminals 404, 405, and 406, respectively. FIG. 6 shows a characteristic curve showing the change of the cutoff frequency when the coefficients K1 · K3 of the filter of the low-pass filter 103 are changed. In FIG. 6, CF1, CF2, and CF3 indicate cutoff frequencies of 10 Hz, 20 Hz, and 30 Hz, respectively, and indicate that the cutoff frequency changes in the direction of the arrow by changing the filter coefficients K1 and K3. Yes. The coefficients K1... K3 for switching the frequency characteristics of the low-pass filter 103 are experimentally obtained in advance, for example, stored in a ROM or the like, and realized by selecting a predetermined coefficient by operating the operation unit 107. it can.

  With the above configuration, the high frequency component from the subtraction unit 104 changes when the characteristics of the low-pass filter 103 change, so the amplitude calculation unit 105 calculates the difference between the maximum value and the minimum value of the subtraction unit 104 output. The control unit 106 switches the band of the low-pass filter 103, obtains the band where the difference of the amplitude calculation unit 105 is the minimum and the band where it is the maximum, and obtains the optimum value of the characteristic of the low-pass filter 103 based on the result. That is, when the band is narrowed, that is, when the cut-off frequency is lowered, the flicker component is removed and the fluctuation is reduced. Further, when the cut-off frequency is increased, a flicker component is introduced and the amount of fluctuation increases. Accordingly, first, the maximum value of the fluctuation is obtained from the calculation result of the amplitude calculation unit 105, and the band of the low-pass filter 103 in which the fluctuation is 10% or less (this is referred to as a threshold T) is obtained. What is necessary is just to obtain | require the optimal zone | band of the low-pass filter 103. FIG. Note that the threshold value T can be appropriately set in consideration of the flicker state, the focus accuracy, and the like.

  When the optimum characteristic of the low-pass filter 103 is determined as described above, the control unit 106 fixes the low-pass filter 103 to the optimum characteristic. That is, the filter coefficients K1 and K3 are fixed. Then, by operating the operation unit 107, the b terminal of the selection unit 102 and the b terminal of the selection unit 108 are selected via the control unit 106, and imaging of the television camera apparatus is started. Focus control in such a configuration will be described. An optical image 702 obtained by imaging the subject is formed on the imaging unit 703. In this case, the subject (generally a moving object) is an actual broadcasting or commercial imaging target, but this subject is illuminated with illumination light whose light amount changes periodically such as a fluorescent lamp. ing. The output of the imaging unit 703 is supplied to the signal processing unit 704 and the focus video signal generation unit 109. The focus video signal from the focus video signal generation unit 109 is supplied to the focus control signal generation unit 706. The focus control signal generated by the focus control signal generation unit 706 is supplied to the low-pass filter 103 via the terminal b of the selection unit 102. Since the low-pass filter 103 is fixed to the low-pass filter characteristic that removes the flicker component caused by the fluorescent lamp as described above, the low-pass filter 103 generates the fluorescence from the focus control signal generated by the focus control signal generator 706 in the low-pass filter 103. The flicker component due to the lamp is removed and supplied to the control unit 709 via the b terminal of the selection unit 108. As a result, only a focus control signal necessary for autofocus is supplied to the control unit 709, and the control unit 709 drives the optical system driving unit 710 based on the focus control signal to perform focusing of the optical system 701. Therefore, even with illumination in which the amount of light of the light source that illuminates the subject changes periodically, it is possible to perform high-precision and favorable focus control with the flicker component removed.

  In the above embodiment, the method of automatically detecting the flicker component when it is unknown and fixing the filter characteristic of the low-pass filter 103 has been described. However, the change in the field period of the television camera device and the light amount of the illumination device is previously described. When the period is known, the filter characteristics of the low-pass filter 103 can be determined based on the calculation in advance, so that the operation unit 107 is operated and the coefficients K1 and K3 shown in FIG. For example, the low-pass filter 103 capable of removing the flicker component due to the illumination light can be realized. Therefore, in such a case, since the filter characteristics of the low-pass filter 103 can be set in advance, as described above, in order to obtain the flicker component, the subject is made in advance and the flicker is automatically detected. Steps are unnecessary.

  Further, when the illumination light is illumination light such as an incandescent lamp or sunlight, no flicker component is generated. Therefore, the operation unit 107 is operated to select the a terminal of the selection unit 108 and the focus control signal generation unit 706 performs focus control. By supplying a signal directly to the control unit 709 via the selection unit 108, autofocus can be realized.

  Although the present invention has been described in detail above, the present invention is not limited to the embodiments of the television camera apparatus described herein, and can be widely applied to television camera apparatuses with various flicker phenomena other than those described above. Needless to say, you can do it.

It is a block diagram which shows schematic structure of one Example of this invention. It is a figure for demonstrating the flicker component of this invention. It is a figure for demonstrating the flicker component of this invention based on a frequency. It is a block diagram which shows schematic structure of one Example of the low-pass filter used for this invention. It is a figure which shows the filter characteristic of the low-pass filter shown in FIG. It is a figure which shows the cut-off frequency characteristic of the low-pass filter used by this invention. It is a block diagram for demonstrating schematic structure of the conventional focus control apparatus. It is a figure for demonstrating the principle of the conventional focus control apparatus. It is a figure for demonstrating the light quantity change by illumination light. It is a figure for demonstrating the flicker phenomenon by illumination light. It is a figure for demonstrating the principle of a flicker phenomenon.

Explanation of symbols

  101: signal average calculation unit, 102, 108: selection unit, 103: low-pass filter, 104: subtraction unit, 105: amplitude calculation unit, 106, 709: control unit, 107: operation unit, 109: focus video signal generation unit, 401: input terminal 402, 403, 407: multiplier, 404, 405, 406: coefficient input terminal, 408, 705: output terminal, 701: optical system, 702: light from the subject, 703: sensor, 704: signal Processing unit, 706: focus control signal generation unit, 707: filter, 708: calculation unit, 710: optical system drive unit.

Claims (1)

An optical system; an optical system driving unit that adjusts the focus of the optical system; an imaging unit that converts incident light from the optical system into a video signal; and a signal processing unit that appropriately processes the video signal from the imaging unit; A focus control signal generation unit that receives a focus video signal from a video signal from the imaging unit, and a first control unit that controls the optical system driving unit based on a focus control signal output from the focus control signal generation unit. A control unit, a signal average calculation unit that calculates an average value of a focus video signal among video signals from the imaging unit, a low-pass filter, a subtraction unit, an output of the signal average calculation unit, and a signal average calculation unit An amplitude calculation unit for calculating a difference between a maximum value and a minimum value between an output and an output output through the low-pass filter; and the low-pass filter based on an output of the amplitude calculation unit. A second control unit that controls the characteristics of the light source, a selection unit that switches an output from the focus control signal generation unit and an output from the signal average calculation unit, and a periodic light amount change is superimposed on the incident light. If it is, the focus control signal outputted from the focus control signal generating unit, and outputs through the low-pass filter to remove the flicker component superimposed on the focus control signal based on the periodic change in light amount When the imaging unit captures a subject that does not have a predetermined movement, the second control unit controls the low-pass filter so that the output of the amplitude calculation unit is maximized, and the selection unit It selects the output from the average calculator, and outputs to the subtracting unit outputs to the low pass filter, the subtraction unit, output and the signal average calculation of the signal average calculation unit An output from the output parts is output via the low-pass filter is subtracted, and a highpass filter with a low-pass filter and the subtraction unit, a flicker component output to the amplitude calculating unit as the output of the subtraction unit, When the imaging unit captures a subject having a predetermined movement, the selection unit selects a signal from the focus control signal generation unit, and controls the optical system driving unit via the low-pass filter . A television camera apparatus, characterized by being supplied to a control unit.

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