KR0134291B1 - Reference value auto setting apparatus for iris contool - Google Patents

Abstract

The present invention relates to a reference value automatic setting device for adjusting the aperture. The apparatus of the present invention comprises a signal detection unit for detecting the magnitude of the signal obtained by imaging gray scale chart and registration chart in one field unit at an initial state, and a constant ratio for each chart with respect to the signal size obtained when the aperture is opened at maximum. Compared with the standard constant value memory unit, which previously stores the value of as a standard constant value, and the magnitude of the standard constant value and the detected value, and the comparison unit that changes the current aperture driving value by the basic change amount according to the comparison result. The aperture control unit controls the amount of the aperture according to the aperture driving value received from the unit, and the reference value storage unit receives and stores the detected value when the two values are the same as the comparison result as the reference value.

Therefore, the present invention does not require a separate waveform measuring instrument when setting the aperture reference value, and provides convenience to the user because the user does not have to set it manually.

Description

Aperture adjustment standard setting device

Figure 1 is a block diagram showing a general aperture control reference value setting device.

2 is a grayscale and registration chart of the apparatus of FIG.

3 is a display state diagram on a waveform instrument in the apparatus of FIG.

4 is a block diagram showing a device for automatically setting a reference value for controlling aperture according to a preferred embodiment of the present invention.

FIG. 5 is a detailed view of the signal detector in the apparatus of FIG. 4; FIG.

* Explanation of symbols for main parts of the drawings

50: signal detection unit 60: standard constant value storage unit

70: comparison unit 80: aperture control unit

90: reference value storage

The present invention relates to an aperture control apparatus for automatically adjusting the exposure of a subject so as to shoot the brightness of the subject in an optimal state in the broadcast camera, in particular the present invention to automatically set the reference value for the aperture adjustment before shooting A reference value automatic setting device for adjusting the iris.

In general, a broadcast camera having a function of automatically adjusting exposure in response to an image signal obtained from an image pickup device automatically adjusts the exposure of a subject based on the brightness of the projectile based on an aperture control reference value.

The open value of the iris is proportional to the signal size. If the amount of light of the image to be captured is too much or too little, the camera adjusts the aperture by the automatic exposure machine to receive an appropriate amount of light. At this time, the aperture value should start at a certain reference point. In addition, it is possible to designate the range of the signal to be used by placing the maximum light intensity range of the signal. Therefore, the reference value of the aperture is initially set. Prior art for setting the reference value for aperture adjustment is PANASONIC's AJ-D310 Service Manual. It is described briefly because it is described in P4-N16. A device for setting a conventional aperture control reference value is shown in FIG.

FIG. 1 is a block diagram illustrating a general aperture control reference value setting device, and a waveform monitor 30 is connected to an output terminal of the video camera 20. The video camera 20 picks up a special chart as shown in FIG. This special chart is composed of a Grayscale CHART of FIG. 2 (a) and a Registration CHART of FIG. 2 (b). The gray scale chart of FIG. 2 (a) is a table showing the lightness from white to black step by step. The registration chart in FIG. 2 (b) is used as a test pattern for a TV, a broadcast, or a business camera. A signal obtained by capturing such a chart at 2000LX is applied to an imaging device made of a charge-coupled device (CCD) or the like through a lens and an aperture in the camera 20. The image pickup device photoelectrically converts an applied optical signal to generate an electrical signal. This signal is output to the waveform measuring instrument 30 through the camera output terminal after the necessary signal processing process in the signal processor. The waveform measuring instrument 30 displays the waveform of the signal supplied from the camera 20 as shown in FIG. 3 so that the user can observe it. The amount of aperture is adjusted so that the waveform size of the gray scale chart displayed on the waveform measuring instrument used as shown in FIG. 3 (a) becomes 100% of the total waveform size. The user also adjusts the amount of aperture so that the magnitude of the waveform for the registration chart displayed on the waveform measuring instrument as shown in FIG. 3 (b) is 70% of the total waveform size. The amount of aperture for the signal generated through this process is set as the reference value for adjusting the aperture.

As described above, in setting the reference value for adjusting the aperture, the user manually adjusts and sets the aperture while watching the waveform displayed on the waveform measuring instrument. Therefore, there is a problem inconvenient the user because not only time consumption but also need to be reset every time.

Accordingly, an object of the present invention is to provide an automatic aperture control reference value setting device that can automatically set the aperture control reference value that has been set manually so as to solve the above problems.

The apparatus for automatically adjusting the aperture value according to the present invention for achieving the above object is an apparatus for setting the aperture value for adjusting the aperture for automatically adjusting the exposure of the aperture in response to an image signal applied through the image pickup device of the broadcasting camera. In the present invention, a gray scale chart, a registration chart, a signal detector for detecting a signal obtained by imaging the two charts, respectively, and a predetermined ratio for each chart with respect to the signal size obtained when the aperture is opened to the maximum. Compares the value of the standard constant value storage unit, which previously stores the value of the value as a standard constant value, with the magnitude of the standard constant value applied from the standard constant value storage unit and the detection value applied from the signal detection unit, and compares the two values. If it does not match, reset the current aperture control value by the basic change amount of the aperture. And a comparison unit for determining the detected value as a reference value for adjusting the aperture when the two values match, an aperture control unit for adjusting exposure of the aperture in response to the aperture adjustment value reset by the comparison unit, and the comparison unit And a reference value memory for storing the detected value determined as the reference value.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing a device for automatically setting a reference value for adjusting aperture according to the present invention. As shown, the video camera according to the present invention comprises an image pickup device comprising a charge-coupled device (CCD) or the like through a lens 41 and an aperture 43 that capture a signal of a special chart in an initial state. 45). The signal photoelectrically converted by the image pickup device 45 is applied to the signal processor 47. The video camera of the present invention is provided with a signal detector (50) for detecting the magnitude of the signal processed by the signal processor (47). The signal size detected by the signal detector 50 is input to the comparator 70. The other input terminal of the comparator 70 is connected to a standard constant value storage unit 60 which pre-stores, as standard constant values, magnitudes of constant ratios among the maximum sizes of the chart signals obtained when all the apertures are opened. The comparison unit 70 obtains the aperture control value by comparing the values through the two input terminals. This adjustment value is supplied to the aperture control unit 80. The aperture control unit 80 adjusts the aperture in response to the input adjustment value. The comparison unit 70 is configured to be stored in the reference value storage unit 90 using the value when two values are the same as the aperture adjustment reference value.

The operation of the aperture control reference value automatic setting device according to the present invention configured as described above will be described in more detail with reference to FIG.

The gray scale chart and the registration chart as shown in FIG. 2 are respectively imaged in the current aperture state. The captured image signal is input to the signal processor 47 to undergo a necessary signal processing. The output signal of the signal processor 47 is input to the signal detector 50 before being output to the output terminal of the camera. A detailed operation of the signal detector 50 will be described first with reference to FIG. 5.

5, the image pickup signal of the special chart applied from the signal processor 47 is input to the brightness information extractor 51. In FIG. The brightness information extractor 51 extracts the brightness information about the input signal in units of fields. The brightness information is represented by a magnitude value of an input signal. The brightness information extractor 51 accumulates and sums each sampling value Vi of the signal input for one field as shown in Equation 1 below, divides the data by the number of samplings N for one field, and averages the signal size during one field. Will print

In this case, a signal size value of a predetermined interval or range may be detected and integrated for one field using a sub-sampling method, and then averaged. The magnitude of the detected signal is proportional to the amount of open of the iris. The signal size of one field extracted by the brightness information extractor 51 is input to the second contact b of the switch 53. The signal size of the previous field is input to the first contact a of the switch 53. The switch 53 switches the signal size applied to the second contact b when the signal input from the signal processor 47 is a vertical blanking section, and switches the first contact a. The latch 55 is connected to the output terminal of the switch 53, and the signal size value switched to the comparator 70 is supplied through the latch 55.

4 again, the standard constant value storage unit 60 sets the value when the aperture is closed to 0 and the value when the aperture is opened to 200, when the user wants to adjust the amount of light in 100 steps. The default aperture control change is two. In this case, the standard constant value storage unit 60 sets the standard constant value to 200, which is 100% of the size of the image of the grayscale chart when the aperture is opened to the maximum, and the size of the signal of the registration chart. Is previously stored at 140, which is 70% of the size when the aperture is opened to the maximum, as a standard constant value. The standard constant value corresponding to the current imaging chart stored in the standard constant value storage unit 60 is supplied to the comparison unit 70. The comparator 70 receives the standard constant value B of the currently captured chart from the standard constant value memory 60 and the signal size average value A for one field detected by the signal detector 50. Compare it. When the detected value A is greater than the standard constant value B, the comparator 70 resets the current aperture control value by decreasing the basic change amount of the aperture. On the other hand, if the detected value (A) is smaller than the standard constant value (B) (AB), the comparator 70 increases the current aperture adjustment value by a basic change amount and resets it. The comparison unit 70 further stores the current aperture adjustment value in the reference value storage unit 90 when the detected value A is equal to the standard constant value B (A = B). The comparison unit 70 applies the reset aperture control value to the aperture control unit 80. The aperture control unit 80 adjusts the amount of opening of the aperture by driving the aperture driving motor (not shown) in response to the input aperture adjustment value. The image pickup signal input through the adjusted aperture is repeatedly performed until the reference value is stored in the reference value storage unit 90. The reference value storage unit 90 stores the current position of the aperture when the standard constant value and the detected signal size are the same through the comparison result of the comparison unit 70. This stored value makes it possible to appropriately adjust the magnitude of the video signal obtained at the time of shooting.

As described above, the present invention relates to a device for automatically setting a reference value for diaphragm adjustment. When setting a reference value of an aperture in an initial state, a waveform meter is required separately, and a user must manually set the reference value of the aperture by looking at the waveform meter. Compared with the related art, the present invention does not require a waveform measuring instrument and automatically sets a reference value of an aperture, thereby providing convenience to a user.

Claims (8)

An apparatus for setting an aperture control reference value for automatically adjusting exposure of an aperture in response to an image signal applied through an image pickup device of a broadcasting camera, comprising: a gray scale chart; Registration chart; A signal detector for detecting a signal obtained by imaging the two charts, respectively, in a predetermined unit; A standard constant value storage unit which pre-stores a value of a constant ratio for each chart with respect to the magnitude of the signal obtained when the aperture is opened to the maximum; Compare the magnitude of the standard constant value applied from the standard constant value storage unit and the detected value applied from the signal detection unit, and if the two values do not match as a result of the comparison, change the current aperture adjustment value by the basic change amount of the aperture and reset it. And a comparison unit determining the detected value as the aperture control reference value when the two values match. An aperture control unit for adjusting the exposure of the aperture in response to the aperture adjustment value reset by the comparison unit; And a reference value memory for storing the detected value determined as the reference value by the comparison unit. The apparatus of claim 1, wherein the signal detector comprises a brightness information extractor for extracting brightness information of a signal input in units of one field and outputting the average value of the signal size of the field. The brightness information extractor according to claim 2, wherein the brightness information extractor accumulates and sums each sampling value Vi of a signal input for one field as follows, dividing by the sampling number N for the field to obtain an average value for one field. A reference value automatic setting device for adjusting the iris, characterized in that the output as the average signal size. The apparatus of claim 2, wherein the brightness information extractor detects a signal size value of one field through a subsampling method. The apparatus of claim 4, wherein the brightness information extractor integrates the obtained signal size value through an integration method and detects the average value of the signal size for one field. 2. The image recording apparatus according to claim 1, wherein the standard constant value storage section sets a value at which the magnitude of the signal photographing the gray scale chart becomes 100% with respect to the size when the aperture is opened to the maximum, and photographs the registration chart. A reference value automatic setting device for diaphragm adjustment, characterized in that a value of 70% of the size of one signal at the maximum aperture is stored as a standard constant value. The method of claim 2 or 6, wherein the comparison unit when the comparison between the standard constant value and the detection value is larger than the standard constant value, if the detection value is larger than the standard constant value by reducing the current aperture adjustment value by the basic change amount of the aperture, characterized in that for resetting Automatic setting device for iris adjustment. The reference value for diaphragm adjustment according to claim 7, wherein the comparison unit resets the current aperture control value by a basic change amount of the aperture when the detected value is smaller than the standard constant value when comparing the standard constant value and the detected value. Auto setting device.