KR20090071775A - Method and appratus for controlling (an) image of projector - Google Patents

Abstract

An image adjustment device and a method of projector are provided to automatically adjust image data depending on the input image and the watching conditions. According to the sensed value from an optical sensor, a peripheral environment recognition unit senses the surrounding environment. An analysis unit(120) determines the image mode by analyzing the inputted image signal. An operation unit(140) regulates the image depending on the inputted signal from the recognition unit and the analysis unit and control signal for a iris and lamp. An image regulation unit implements a best suited image according to the output of the operation unit.

Description

Image control apparatus and method of a projector {Method and appratus for controlling (an) image of projector}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus, and more particularly, to an image adjusting apparatus and a method of a projector for automatically adjusting an image according to an input image and viewing conditions in a projector.

In general, a projector is a kind of advanced light exchanger that displays a video image magnified through a lens by receiving signals from various video devices such as TV, VCR, DVD player, PC, camcorder, etc.

Unlike the three-tube projectors called beam projectors, current LCP and DLP projectors have the ability to automatically display the optimal screen simply by connecting various video devices without the need for settings. In recent years, corporate presentations and home ghaTLdjxj It is rapidly spreading for dragons.

To be called a data projector, it must have a panel resolution of at least XGA (1024 * 768) or higher, and its brightness must also be such that the screen is not dark in a medium-sized or larger conference room.

In particular, data projectors will be mainly used for PC presentations, so compatibility with PC input is very important, and additional functions such as enlarging a portion of the screen will be more convenient. Such projectors include PRT (CRT) projectors, LCD projectors, and DLP projectors.

When watching the current projector, user's setting is done by surrounding environment or input image mode (sport, movie, music, etc.), and the adjustment of the image selected by user's setting is performed by internal circuit. To display.

However, there is a hassle for the user to set one by one according to the surrounding environment and the image mode, and the signal output corresponding to the image mode selected by the user is adjusted by adjusting the contrast or brightness block in the circuit system. Noise may occur due to reduced reproduction and resolution, resulting in the failure to display an optimal image.

Hereinafter, an image adjusting method of a projector according to the prior art will be described with reference to the accompanying drawings.

1 is a graph illustrating a method of controlling an image signal when a conventional image mode is changed, and FIG. 2 is a flowchart illustrating a method of changing an image mode of a projector according to the prior art.

1 is a view illustrating a method of controlling a video signal when changing a conventional melting mode. As an example of changing a preset image setting value according to an image mode selected by a user, an example of changing contrast and brightness in an image block is shown. It is shown.

That is, as shown in FIG. 1, the brightness is changed at a specific input level to correspond to the image mode, but the black level due to the change in the brilliance is increased, and the resolution is reduced due to the change in contrast, and the overall brightness is also reduced. Falls.

In addition, there is a problem in that the image expression is unnatural and the signal noise is also generated due to the reduction of the gray scale ability of the image.

Referring to FIG. 2, a method of changing a video mode of a projector according to the prior art first determines a video mode setting state before powering off when a power-on command is input by a user (S11).

Then, the image adjustment value is set to the read value of the identified image adjustment circuit block (S12).

Subsequently, it is determined whether the user image mode is changed (S13).

As a result of the determination (S13), if there is a change in the image mode from the user, image adjustment data corresponding to the selected image mode is read (S14).

After setting the read image adjustment data, image adjustment is performed (S15).

Therefore, it reads the video mode at power-off at power-on and checks whether the video mode is changed by the user in the state of adjusting the video. If there is no change, the current video is displayed. Reads the previously stored image data control value for the mode and sets the image to display on the screen.

The conventional method is a manual method that can be changed only by the user's video mode setting. The conventional method does not provide optimal video display in a manner that does not take into consideration the user's inconvenience and does not take into account current viewing conditions (eg, ambient light). There was a downside.

The present invention has been made to solve the above problems, and an object thereof is to analyze an input video signal and to automatically select a video mode according to the corresponding video signal.

In addition, the present invention has another object to analyze the current viewing environment of the user to automatically select the optimal image quality conditions accordingly.

In order to achieve the above object, the apparatus for automatically adjusting an image of a projector according to the present invention is a projector having an optical sensor, an aperture, and a lamp. A recognition unit, an analysis unit for determining an image mode by analyzing the input image signal, and outputting a signal for controlling an image and controlling driving of the iris and lamp according to signals input through the environment recognition unit and analysis unit And an image adjusting unit for implementing an optimal image according to the output of the calculating unit.

According to an aspect of the present invention, there is provided a method for automatically adjusting an image of a projector, the method including adjusting an image mode according to an input image signal, the method including: Recognizing the surrounding environment according to the detected value detected by the sensor, performing image adjustment according to the determined image mode and the surrounding environment, and according to the determined image mode and the surrounding environment It is characterized by including the step of controlling the driving at the same time.

The apparatus and method for automatically adjusting image of a projector according to the present invention has the following effects.

First, image quality deterioration does not occur by performing image adjustment using the lamp and the aperture of the projector.

Second, the video mode is automatically set by analyzing the video signal input by the user without any setting input.

Third, it is possible to provide the user with the best image quality by automatically analyzing the video mode and the surrounding environment by grasping the surrounding viewing conditions.

Fourth, as the image adjustment is performed using the lamp and the aperture constituting the projector, a separate image adjustment apparatus is not required, so the maximum effect can be obtained at a minimum cost.

Hereinafter, an apparatus and method for controlling an image of a projector according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating an image adjusting apparatus of a projector according to the present invention, and FIG. 4 is a block diagram illustrating an image adjusting method of a projector according to the present invention.

As shown in FIG. 3, the apparatus for adjusting an image of a projector according to the present invention recognizes an ambient environment and illuminance according to an optical sensor 100 for detecting light and light detected through the optical sensor 100. A first environmental environment recognition unit 110 for receiving an image signal analysis unit 120 for analyzing the input image signal, and an output of the ambient environment recognition unit 110 and the image signal analysis unit 120 A first operation unit 140 for performing an operation, an image adjustment unit 130 for performing image adjustment by receiving an analysis result of the image signal analysis unit 120 and an operation result of the first operation unit 140, and the According to the output of the second operation unit 150 and the output of the second operation unit 150 for receiving the calculation result of the first operation unit 140 to perform operations for controlling the driving of the lamp 190 and the aperture 170. Aperture driving unit 160 for driving the aperture 170 and exit of the second operation unit 150 Depending on is configured to include a lamp driving unit 180 for driving the lamp (190).

Here, the video signal analyzer 120 analyzes a histogram of the input video signal and accordingly analyzes the video mode through the first analyzer 121 and the first analyzer 121. And a second analyzer 122 for analyzing the parameter according to the analyzed image mode.

Referring to the operation of the image adjustment device of the projector according to the present invention configured as described above are as follows.

First, when an image signal is input, it is input to the first analyzer 121, and the first analyzer 121 observes an image form of a certain period of time, that is, contrast, brightness and gain, as shown in FIG. Determining the mode of the input image signal, the second analysis unit 122 analyzes the parameter according to the image mode determined by the first analysis unit 121 and outputs to the first operation unit 140.

Meanwhile, the ambient light is sensed through the optical sensor 100, and the illuminance and surroundings currently sensed by converting the analog data input as digital data into the digital data as it is transmitted to the ambient environment recognition unit 110 are compared with preset data. The parameter value optimal for the environment is calculated and output to the first calculator 140.

Accordingly, the first calculating unit 140 receives the parameter analyzed by the second analyzing unit 122 and the parameter calculated by the surrounding environment recognition unit 110, and the dimming of the lamp 190 and the By calculating a parameter for controlling the aperture 170 and outputting it to the second calculating unit 150, and outputting to the image adjusting unit 130, the auto gain 131, auto contrast 132, auto brightness 133, the auto gamma 134 is set automatically, and then the optimum image is output.

In addition, the second calculator 150 outputs a control signal for controlling the driving of the aperture 170 to the aperture driver 160 according to the parameter control value output from the first calculator 140. An operation signal for dimming the lamp 190 and a driving signal for driving the lamp 190 are output to the lamp driver 180.

Then, the aperture 170 and the lamp 190 are controlled to be suitable for the image mode and the surrounding environment according to the driving signals of the aperture driver 160 and the lamp driver 180.

In the image adjusting apparatus of the projector according to the present invention configured as described above, as an example of the configuration for determining the mode of the input image signal, it will be output through the frame average level calculator 200 as described with reference to FIG. A signal characteristic determination unit 210 which receives an average frame signal level and determines signal characteristics, calculates a frame average level of a video signal of one frame received through the signal characteristic determination unit 210, and sets a predetermined high In addition to determining the contrast and brightness characteristics of the image through the distribution of the level signals, the input image mode may be determined by storing and comparing a signal of a predetermined amount of frame units.

Accordingly, the signal characteristic determination unit 210 determines an average signal level in one frame of the input image signal (211), extracts the white region and the black region (212) (213), and extracts the contrast characteristic. (214).

In addition, the storage unit 221 for storing the frame in which the characteristic is determined as described above, and compares the data stored in the storage unit 221 with a predetermined value by comparing within a predetermined period of time to compare the contrast, brightness and gain value The video mode of the currently input video signal may be determined by comparing the calculated data calculator 222 and the data calculated by the calculator 222 with a preset reference value.

That is, the current video mode can be determined by comparing with a preset value as shown in the following table.

mode sports movie ... news Contrast 100 90 ... 70 Brightness 40 45 ... 45 ... ... ... ... Gain 1.2 One ... 0.9

An example of a method of reducing and extending the dynamic range of the projector according to the present invention will be described with reference to FIG. 5. As shown in FIG. 5A, the signal gain is maximized in the image content expressed in 25% of the image dynamic range. In this case, the signal can be expressed in the entire signal region as shown in (b) of FIG. 5, but for some input signals, a saturated portion may occur and the signal level becomes too high.

Also, as shown in Fig. 6A, the output can be increased by changing the brightness, but the black level is increased. Therefore, as shown in (b) of FIG. 6, by restoring the signal by dimming the aperture and the lamp, the black level is reduced and the margin for the output is prevented, thereby preventing signal saturation. Accurate signal gray representation and noise can be reduced accordingly.

An example of a method for determining an automatic mode of an image signal through the first analyzer 121 illustrated in FIG. 3 will be described with reference to FIG. 7 again. In displaying 1080 * 720P, one block is 128 pixels. The brightness comparison of each block is set to an arbitrary level and if it is higher than it, it is set to white if it is lower than it, and if it is lower than it, it is set to black. The brightness of the video signal input through the linear section can be determined.

Meanwhile, the ambient illuminance and the surrounding environment detected through the optical sensor 100 shown in FIG. 3 are automatically sensed, and the detected signal is input to the surrounding environment recognition unit 110 as shown in FIG. The second calculation unit 150 receives a signal recognized by the surrounding environment recognition unit 110 and changes a gamma curve to a user as shown in FIG. 8B. It can improve the contrast according to the characteristics of the human eye.

In addition, the gamma curve is adjusted according to the surrounding environment detected by the surrounding environment recognition unit 110, the image is output, and the aperture is controlled by the aperture driver 160 and the lamp driver 180. By outputting a signal to operate in conjunction with it can provide a better picture quality.

That is, as shown in FIG. 9, in controlling the diaphragm 170 and the lamp 190, the minimum and maximum values for dimming the lamp 190 as shown in FIG. 9A, and FIG. By selecting the minimum, maximum opening and closing of the aperture 170 as shown in (b) of FIG. 9, the dimming and the aperture amount can be determined in the linear section of the minimum and maximum sections. It becomes a graph form like c).

Therefore, it automatically selects the image mode based on contrast, brightness and gain based on the input image signal, and also resets the image adjustment data so that an optimum image can be output by investigating the surrounding environment. At the same time, the amount of ramp dimming and iris can be varied according to the input image source, so that the image can be displayed without distortion of the signal, and the input signal is analyzed in real time according to the state stored as a sufficient experimental value in advance. By analyzing the, distortion of the screen generated during the switching can be prevented in advance.

1 is a graph illustrating a method of controlling a video signal when a conventional video mode is changed.

2 is a flowchart illustrating a method of changing an image mode of a projector according to the prior art.

3 is a block diagram showing an image adjusting apparatus of a projector according to the present invention.

Figure 4 is a block diagram showing an image adjusting method of a projector according to the present invention.

5 is a diagram illustrating an example of a method of reducing and extending a dynamic range of a projector according to the present invention;

6 to 9 are graphs for explaining the image adjusting method of the projector according to the present invention.

<Description of Main Parts of Drawings>

100: light sensor 110: ambient environment recognition unit

120: image signal analysis unit 130: image adjustment unit

140: first operation unit 150: second operation unit

160: aperture 170: lamp drive unit

180: lamp

Claims (10)

In a projector having an optical sensor, an aperture and a lamp, Surrounding environment recognition unit for recognizing the surrounding environment according to the detection value detected by the optical sensor; An analyzer for determining an image mode by analyzing an input image signal; An operation unit for outputting a signal for adjusting an image and controlling driving of the iris and a lamp according to a signal input through the environment recognition unit and the analysis unit; And, And an image adjusting unit for realizing an optimal image according to the output of the calculating unit. The method of claim 1, The analysis unit A projector comprising a first analyzer for analyzing a histogram of an input image signal and analyzing a video mode, and a second analyzer for analyzing a parameter according to an analysis result analyzed by the first analyzer Video controller. The method of claim 1, The calculation unit A first operation unit which calculates and outputs a control value corresponding to an optimal image of an input image signal according to the parameter value analyzed by the analysis unit and the surrounding environment recognized by the surrounding environment recognition unit, and a calculation result of the first calculating unit And a second calculator configured to receive a second output unit and output a control value for optimal driving of the iris and the lamp. The method of claim 3, wherein The first calculator receives a parameter value according to an image mode and a parameter value according to the surrounding environment recognized by the surrounding environment recognition unit, and calculates a parameter for controlling the lamp dimming and the iris through the analyzing unit. And adjusting the gain, contrast, brightness, and gamma setting coefficients according to the optimal display conditions and transmitting the gains, contrasts, brightness, and gamma setting coefficients to the corresponding area of the image adjusting unit. The method of claim 3, wherein The second calculating unit And receiving a parameter value generated by the first calculator to output a signal for operation and driving for controlling the iris and the lamp. The method of claim 1, And an aperture driver controlling the driving of the aperture according to the operation signal of the second calculator and a lamp driver controlling the driving of the lamp. In the image adjusting method of a projector having an optical sensor, an iris and a lamp, Determining an image mode according to an input image signal; Recognizing the surrounding environment according to the detected value detected by the optical sensor; Performing image adjustment according to the determined image mode and the surrounding environment; And, And controlling driving of the iris and the lamp simultaneously according to the determined image mode and the surrounding environment. The method of claim 7, wherein The determining of the video mode Calculating an average level for each frame of the input video signal, extracting a white region and a black region of the calculated average level, extracting contrast characteristics according to the extracted white region and black region; And determining the corresponding image mode by comparing the extracted characteristic with a preset reference value. The method of claim 7, wherein Performing the image adjustment is And automatically adjusting gain, contrast, brightness and gamma value according to the determined image mode. The method of claim 7, wherein The controlling of the aperture and the lamp drive is Calculating a parameter according to the determined image mode and a parameter according to the recognized surrounding environment, and controlling dimming of the aperture and the lamp according to the calculated value. How to adjust the image of the projector.

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