KR101133133B1 - Apparatus and method for processing digital image - Google Patents

Abstract

The present invention relates to a digital image processing apparatus and method, and more particularly, to digital image processing for automatically adjusting the brightness of an iris lens by appropriately amplifying the image signal within the apparatus without directly adjusting the brightness level of the iris lens. An apparatus and method are provided. The control method of the digital image processing apparatus includes comparing a luminance signal of an image signal input through an iris lens and a third reference luminance signal, and attenuating or increasing compensation of the luminance of the image signal according to a result of the comparison to compensate for the compensation. And controlling the opening and closing operations of the iris to adjust the amount of light input through the iris lens by the image signal.

Description

Apparatus and method for processing digital image}

1 is a block diagram showing a configuration of a digital image processing apparatus including a conventional video driving iris lens.

2 is a block diagram illustrating a configuration of a digital image processing apparatus according to an exemplary embodiment.

3 is a flowchart illustrating an operation of a digital image processing method according to an embodiment of the present invention.

The present invention relates to a digital image processing apparatus and method, and more particularly, to digital image processing for automatically adjusting the brightness of an iris lens by appropriately amplifying the image signal within the apparatus without directly adjusting the brightness level of the iris lens. An apparatus and method are provided.

The iris lens used in the digital image processing apparatus is a lens that adjusts the amount of light as an aperture, and can be largely divided into a video driving iris lens and a DC iris lens.

FIG. 1 is a block diagram showing a configuration of a digital image processing apparatus including a conventional video driving iris lens, and includes a lens unit 110, a charge coupled device (CCD) 120, and a correlated double (CDS) having an iris lens. a sampler 130, an amplifier 170, an ADC 150, an image processor 160, a 2CH DAC 170, and a Y / C mixer 180.

Referring to FIG. 1, the CCD 120 accumulates an amount of light input from an external light source, processes an image captured by the lens unit 110 by the image processor 160 according to the accumulated light amount, and outputs the image according to a synchronization signal. do. The CDS 130 and the amplifying unit 140 amplify the image and light amount signals output from the CCD 120 and feed back to the lens unit 110. The ADC 150 converts the image and light quantity analog signals output from the CCD 120 into digital outputs. The image processor 160 separates the digitally processed image and the light quantity signal into a luminance signal Y and a color signal C, and processes the digitally processed image and light signal into a displayable signal. The 2CH DAC 170 converts the image-processed luminance signal Y and the color signal C into analog image signals, and the Y / C mixing unit 180 converts 1 Vp from the analog luminance signal Y and the color signal C. -p Generates a composite video signal that can be connected to a monitor (not shown) for display.

In the digital image processing apparatus using the video driving iris lens shown in FIG. 1, the lens is automatically adjusted by using 1Vp-p of the image signal. The disadvantage is that the lens unit 110 is expensive because it includes a control circuit (not shown) for controlling the iris. In terms of installation, if the user wants to adjust the brightness of the camera to adjust the brightness of the lens VR (110, 111) directly. However, in order to adjust the brightness, additional tools are needed, and in order to check the desired image, various inconveniences occur because the adjustment is made while communicating with the monitoring place. In order to overcome this problem, a DC iris lens has been devised, but when it is difficult to control and the characteristics of the camera and the lens do not match, there is a problem of unstable operation.

The technical problem to be achieved by the present invention is to provide a digital image processing apparatus and method for automatically adjusting the brightness of the iris lens by appropriately amplifying the image signal within the device without directly adjusting the brightness level of the iris lens.

According to an aspect of the present invention, there is provided a method of controlling a digital image processing apparatus, the method including: (a) comparing a luminance signal of a video signal input through an iris lens with a third reference luminance signal; And (b) attenuating or increasing compensation of the brightness of the video signal according to the comparison result to control opening and closing operations of the iris to adjust the amount of light input through the iris lens by the compensated video signal. It is preferred to include the step.

The method of the present invention may further include testing whether the iris lens can be controlled to adjust the brightness of the image signal input before the step (a).

In the present invention, the step may include comparing the luminance signal of the image input after the aperture opening with a first reference luminance signal; Comparing the luminance signal of the image input after closing the iris with a second reference luminance signal; And if the luminance signal of the image is larger than the first reference luminance signal and smaller than the second reference luminance signal, determining that the iris lens is operating normally.

In the present invention, if the luminance signal of the image input through the lens is smaller than a third reference luminance signal, the image signal is compensated for by reducing the aperture to open the aperture, and the luminance signal of the image input through the lens is The image signal is increased and compensated to close the aperture when the third reference luminance signal is larger than the third reference luminance signal.

In the present invention, when the luminance signal of the image input through the lens is the same as the third reference luminance signal, the aperture is operated without a reduction or increase compensation of the image signal.

According to an aspect of the present invention, there is provided a digital image processing apparatus including: a lens unit configured to receive and adjust a light amount of an input image signal according to whether an aperture is opened or closed; A controller for comparing a luminance signal of the image signal input through the lens unit with a third reference luminance signal and outputting a compensation signal to compensate for the brightness of the image signal; And a compensation unit configured to control the aperture opening and closing operation of the lens unit by reducing or increasing compensation of the image signal by the brightness compensation signal.

In one embodiment of the present invention, the control unit compares the luminance signal of the image input after the aperture opening with a first reference luminance signal and a second reference luminance signal, so that the luminance signal of the image is larger than the first reference luminance signal, If it is smaller than the second reference luminance signal, it is determined that the lens unit is operating normally.

In the present invention, if the luminance signal of the image input through the lens is smaller than the third reference luminance signal, the control unit outputs a compensation signal for opening the aperture to the compensation unit, the image input through the lens If the luminance signal is greater than the third reference luminance signal, characterized in that for outputting a compensation signal for closing the aperture to the compensation unit.

In the present invention, when the compensator receives a compensation signal for opening the aperture from the control unit, the compensator controls the opening operation of the aperture by reducing and compensating the image signal, and receives a compensation signal for closing the aperture from the control unit. When the image signal is increased and compensated for, the closing operation of the iris is controlled.

In the present invention, the controller outputs a compensation control signal that does not compensate for the image signal when the brightness of the image signal input through the lens unit is equal to the third reference brightness.

The compensation unit may receive the compensation signal from the controller and operate the aperture without compensating for the decrease or increase of the video signal.

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

The level setting of the video driving iris lens according to the present invention allows the image signal to be properly amplified and operated. Therefore, even if the iris lens levels 204 and 205 are set automatically, if the signal is automatically generated to compensate for this, the iris lens can maintain a constant screen brightness at all times and the brightness desired by the user can be set to the iris lens level 204. 205 can be adjusted in the camera without direct adjustment.

2 is a block diagram showing the configuration of a digital image processing apparatus according to an embodiment of the present invention. The lens unit 200 and the CCD including the iris lens 201, the aperture 202, and the aperture driver 203 are illustrated in FIG. Charge Coupled Device (210), ADC 220, Image Processor 230, DAC 240, Y / C Mixer 250, Correlated Double Sampler (CDS) 260, Controller 270, Compensator 280, an amplifying unit 290.

The lens unit 200 receives light from an external light source and processes an image. The iris lens 201 provided in the lens unit 200 adjusts the amount of light (light amount) incident upon the degree of opening and closing of the aperture 202. In this case, the aperture driver 203 opens and closes the aperture 202 according to the amplified image signal output from the amplifier 290.

The CCD 210 accumulates the amount of light input through the lens unit 200 and outputs an image captured by the lens unit 200 according to the accumulated light amount in accordance with the vertical synchronization signal.

The ADC 220 converts an analog image signal output from the CCD 210 into a digital signal.

The image processor 230 performs a signal processing to display a digitally converted image signal, and outputs the luminance signal Y and the color signal C separately, and the 2CH DAC 240 performs the processed luminance signal Y and The color signal C is converted into an analog video signal again.

The Y / C mixing unit 250 generates a 1 Vp-p composite video signal from the analog luminance signal Y and the color signal C to be connected to a monitor (not shown) for display.

The CDS 260 uses a sampling hold preset (SHP) and a sampling hold data (SHD: sampling hold data) to determine a reference level in order to remove noise generated during readout from the pixel. The pure signal level is obtained from the difference between the two values and input to the compensator 280.

The controller 270 performs luminance compensation control by comparing the luminance signal of the image output from the image processor 230 with the third reference luminance signal. The third reference luminance signal may be set according to a user's preference, and may be set to a desired value by bringing up a menu. In general, when the brightness is set to 100 IRE in the NTSC standard, the screen is expressed in white. When the brightness is set to 7.5 IRE, the screen is represented in black. Therefore, the user can set the desired third reference brightness within 30 IRE to 90 IRE. Can be set.

As a result of the comparison by the controller 270, when the luminance signal of the image is smaller than the third reference luminance signal, the first control signal is output to the compensator 280. The first control signal output to the compensator 280 is a control signal for further opening the stop 202. The compensator 280 compensates for the image signal output from the CDS 260 by the first control signal output from the controller 270. The compensator 280 may adjust, for example, an image signal level input from -6 dB to +6 dB, and the controller 270 outputs a first control signal of a voltage level or a PWM signal to the compensator 280. do. From the comparison result, the compensator 260 compensates for reducing the level of the video signal output from the CDS 260 to open the diaphragm 202.

As a result of the comparison by the controller 270, when the luminance signal of the image is greater than the third reference luminance signal, the second control signal is output to the compensator 280. The second control signal output to the compensator 280 is a control signal for further closing the stop 202. The compensator 280 compensates for the image signal output from the CDS 260 by the second control signal output from the controller 270. From the comparison result, the compensator 260 compensates for increasing the level of the image signal output from the CDS 260 to close the aperture 202.

The amplifier 290 amplifies the attenuation compensation or incrementally compensated image signal output from the compensator 280 and outputs the amplified compensation signal to the aperture driver 203.

The aperture driver 203 performs the opening / closing operation of the aperture 202 by using the amplified image signal, and adjusts the amount of light incident through the iris lens 201 according to the opening / closing operation of the aperture 202.

In addition, when the user wants to adjust the brightness of the camera, as in the conventional method, the brightness of VRs 204 and 205 for adjusting the brightness of the lens may be directly adjusted, and may be adjusted through an OSD (not shown) provided by the controller.

Subsequently, as a result of the comparison of the controller 270, when the luminance signal of the image and the third reference luminance signal are the same, the controller 270 may output the image signal output from the CDS 260 to the amplifier 290 without being compensated. To control.

The controller 270 also tests whether the iris lens 201 is controllable before automatically adjusting the luminance of the iris lens 201. When performing the test, the controller 270 resets the environment of the digital image processing apparatus, and turns off factors such as shutter and gain that affect brightness. Thereafter, the control unit 270 receives the luminance signal of the image after the aperture 202 is opened, compares it with the first reference luminance signal, closes the aperture 202, and receives the luminance signal of the image to receive the second reference signal. Compare with the luminance signal. Here, as an example, the first reference luminance signal may be 90 IRE in which the screen is represented by white, and the second reference luminance signal may be 30 IRE in which the screen is represented by black. As a result of the comparison, when the luminance signal of the received image is larger than the first reference luminance signal and smaller than the second reference luminance signal, it is determined that the iris lens 201 is operating normally.

3 is a flowchart illustrating an operation of a digital image processing method according to an embodiment of the present invention.

The user selects an automatic video brightness adjustment menu using a user manipulation button (not shown) provided outside the digital image processing apparatus (step 300).

Since there is a deviation for each lens, the controller 270 performs a series of operations for testing whether the lens can be controlled.

The controller 270 which receives the automatic video brightness adjustment menu selection resets the environment of the digital image processing apparatus, and turns off the factors affecting the brightness, that is, the shutter and the gain (step 305).

In operation 310, the controller 270 receives the luminance data of the image after opening the diaphragm 202.

It is determined whether the received luminance signal is greater than the first reference luminance signal (step 315). Otherwise, an error message is output (step 320). The first reference luminance signal may be, for example, 90 IRE in which the aperture 202 is completely open and the screen is represented in white.

In operation 325, the controller 270 closes the aperture 202 and receives luminance data of the image.

The controller 270 determines whether the received luminance signal is smaller than the second reference luminance signal (step 330), and if not, outputs an error message (step 320). For example, the second reference luminance signal may be 7.5 IRE in which the aperture 202 is completely closed and the screen is displayed in black.

If the luminance signal received after opening of the iris 202 is greater than the first reference luminance signal, and the luminance signal received after closing of the iris 202 is smaller than the second reference luminance signal, the controller 270 determines that the iris lens 201 It is determined that it is operating normally (step 335).

The controller 270 that determines that the iris lens 201 is operating normally enters the level setting mode of the video driving iris lens.

The controller 270 compares the luminance signal of the input image with the third reference luminance signal to determine whether the luminance signal of the input image is smaller than the third reference luminance signal in step 340. The third reference luminance signal may be set according to a user's preference, and may be set to a desired value by bringing up a menu. In general, when the brightness is set to 100 IRE in the NTSC standard, the screen is expressed in white. When the brightness is set to 7.5 IRE, the screen is expressed in black. Therefore, the user can set the desired third reference brightness within 30 IRE to 90 IRE. Can be set.

If the luminance signal of the input image is smaller than the third reference luminance signal, the controller 270 compensates the image signal by the first control signal to perform the opening operation of the diaphragm 202 (step 345). When the luminance signal of the input image is smaller than the third reference luminance signal, the controller 270 outputs the first control signal for further opening the aperture 202 to the compensator 280. In response to the first control signal, the compensator 280 compensates for reducing the level of the image signal output from the CDS 260 to open the aperture 202. The image signal on which the reduction compensation is performed is amplified by the amplifier 290 and output to the aperture driver 203 so that the aperture 202 is opened.

The controller 270 compares the luminance signal of the input image with the third reference luminance signal to determine whether the luminance signal of the input image is greater than the third reference luminance signal (step 350).

When the luminance signal of the input image is larger than the third reference luminance signal, the controller 270 compensates the image signal by the second control signal to perform the closing operation of the aperture 202 (step 355). When the luminance signal of the input image is greater than the third reference luminance signal, the controller 270 outputs a second control signal for further closing the aperture 202 to the compensator 280. By the second control signal, the compensator 280 compensates for increasing the level of the image signal output from the CDS 260 to close the aperture 202. The image signal subjected to the increase compensation is amplified by the amplifier 290 and output to the aperture driver 203 so that the aperture 202 is closed.

The controller 270 compares the luminance signal of the input image with the third reference luminance signal to determine whether the luminance signal of the input image and the third reference luminance signal are the same (step 360).

If the luminance signal of the input image is the same as the third reference luminance signal, the controller 270 controls the image signal output from the CDS 260 to be output to the amplifier 290 without being compensated and stores the control signal. And exit (step 365).

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, without adjusting the brightness level of the iris lens directly, the image signal is properly amplified in the device to automatically adjust the brightness of the iris lens so that the iris lens is always maintained without a user's intervention. Creates the effect of maintaining brightness.

Claims (11)

As a control method of a digital image processing apparatus,  (a) comparing the luminance signal of the image signal input through the iris lens with the third reference luminance signal; And (b) opening or closing the aperture to adjust the amount of light input through the iris lens by the compensated image signal by decreasing or increasing compensation of the image signal in proportion to the luminance signal of the image signal according to the comparison result. And controlling the closing operation. The method of claim 1, wherein before step (a) And testing whether the iris lens can be controlled to adjust brightness of an input image signal. The method of claim 2, wherein said testing step Comparing the luminance signal of the image signal input after opening the iris with a first reference luminance signal; Comparing the luminance signal of the image signal input after closing the iris with a second reference luminance signal; And Determining that the iris lens is operating normally when the luminance signal of the image signal is larger than the first reference luminance signal and smaller than the second reference luminance signal. Control method. The method of claim 1, wherein in step (b), When the luminance signal of the image signal input through the lens is smaller than the third reference luminance signal, the image signal is compensated for by reducing the aperture to open the aperture, and the luminance signal of the image signal input through the lens is the third reference. And if the luminance signal is larger than the luminance signal, compensating the image signal to close the aperture. The method of claim 1, wherein in step (b), And when the luminance signal of the image signal input through the lens is the same as the third reference luminance signal, operating the aperture without compensating for the decrease or increase of the image signal. A lens unit adjusting and receiving a light amount of an input image signal according to whether the aperture is opened or closed; A controller for comparing a luminance signal of the image signal input through the lens unit with a third reference luminance signal and outputting a compensation signal to compensate for the brightness of the image signal; And And a compensator configured to reduce or increase compensation of the video signal in proportion to the brightness signal of the video signal by the brightness compensation signal to control the aperture opening and closing of the lens unit. The method of claim 6, wherein the control unit The luminance signal of the image signal input after opening the aperture is compared with the first reference luminance signal and the second reference luminance signal, so that the luminance signal of the image signal is greater than the first reference luminance signal and is greater than the second reference luminance signal. If it is small, it is determined that the lens unit is operating normally. The method of claim 6, wherein the control unit When the luminance signal of the image signal input through the lens unit is smaller than the third reference luminance signal, a compensation signal for opening the aperture is output to the compensation unit, and the luminance signal of the image signal input through the lens unit is the second signal. And a compensation signal for closing the iris to the compensator when the reference luminance signal is greater than 3 reference luminance signals. The method of claim 8, wherein the compensation unit When the compensation signal for opening the iris is received from the controller, the video signal is reduced and compensated to control the opening operation of the iris, and when the compensation signal for closing the iris is received from the controller, the video signal is increased and compensated. And controlling the closing operation of the iris. The method of claim 6, wherein the control unit And a compensation signal not compensating for the video signal when the brightness of the image signal input through the lens unit is equal to a third reference brightness. The method of claim 10, wherein the compensation unit And receiving the compensation signal from the controller to operate the aperture without compensating for the decrease or increase in the video signal.

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