KR100662413B1 - The display device for offering movie modes and method for controlling the same - Google Patents

Abstract

A video device supporting a movie mode and a control method thereof are provided to display a movie signal in the movie mode or a general video mode according to whether text broadcasting is displayed, thereby removing a problem that a caption of the text broadcasting trembles. A video device(301) supporting a movie mode comprises the following: a window generator(306) for setting a predetermined area of a display screen as a text window area; a storage(307) for storing video data of the text window area set by the window generator(306); a text broadcasting determiner(311) which compares the stored video data and determines whether signals related with text broadcasting are applied; and a controller(312) which converts the video signal from the movie mode to a general video mode so as to be displayed if the signals related with text broadcasting are applied.

Description

The video device supporting the movie mode and its control method {The display device for offering movie modes and method for controlling the same}

1 is a diagram illustrating an embodiment of configuring a general movie mode screen

2 is a diagram illustrating a display screen of a video device supporting a movie mode according to the related art.

3 is a block diagram showing a configuration of a video device supporting a movie mode according to the present invention;

4 is a diagram illustrating a display screen of a video device supporting a movie mode according to the present invention;

5 is a diagram illustrating a process of character broadcasting determination unit of a video device supporting a movie mode according to the present invention.

6 is a flowchart (flow chart) showing a control method of a video device supporting a movie mode according to the present invention.

7 is a flowchart (flow chart) showing a control method for determining whether a signal related to text broadcasting is received by a video device according to the present invention.

* Explanation of symbols for main parts of drawings *

301: Video device 302: Movie signal discrimination unit

303: Image memory section 304: De-interlacer section

305: display unit 306: window generation unit

307: storage unit 308: character broadcasting determination unit

309: white image detection unit 310: phase difference comparison unit

311: character broadcasting judgment output unit 312: control unit

The present invention relates to an image device, and more particularly, to an image device supporting a movie mode and a control method thereof.

1 is a diagram illustrating an embodiment of configuring a general movie mode screen. Hereinafter, an embodiment of displaying a movie mode screen by a 3: 2 pull-down function will be described with reference to FIG. 1.

The film shot at the film shop is a 24Hz video. In order to transmit the 24Hz movie image information to the 60Hz interlace, if each chapter of the movie is made of 60Hz interlace of 3 and 2 sheets, the movie image can be transmitted and received by TV broadcasting.

FIG. 1B is a sequence of movie sources transmitted by a broadcasting station and received by a video device such as a TV. A 60 Hz interlaced analog television without general memory can deflect and display the image in (b).

Recently, however, video devices that can display such as (c) have been released. Such a display function is called a 3: 2 pull-down function.

More specifically, the 3: 2 pull-down function means three fields 1T, 1B, and 1T in the first frame, two fields 2B and 2T in the second frame, and three fields 3B in the third frame. , 3T, 3B, and in the fourth frame, the process of outputting two fields 4T and 4B is repeated to replace 24 frames with 60 fields. In other words, it converts two 24Hz frames into five 60Hz fields, which means that one field is repeated in the first frame to make three fields, and two fields are made in the second frame.

However, the above-described video apparatus that supports the conventional movie mode has the following problems.

When a movie signal is applied to a video device and a signal related to text broadcasting is simultaneously received from a broadcasting station, the movie is displayed on a screen converted to a 3: 2 method, but the text broadcasting at the bottom of the screen is a movie mode such as the 3: 2 method. Is displayed in normal video mode.

At this time, due to the de-interlacer (or progressive) operation, the odd and even fields of the field are mixed, and thus, there is a problem that the text broadcasting is momentarily shaken.

That is, as shown in FIG. 2, there is a problem in that the characters of the text broadcasting displayed on the lower portion of the movie screen are displayed in an incomplete state such as shaking or blurring.

The present invention is to solve the above problems, an object of the present invention is to display a movie signal in the movie mode (for example 3: 2 pull-down), or to the normal video mode depending on whether the text broadcast is displayed The present invention provides a video device that supports a movie mode capable of eliminating the shaking of a subtitle of a text broadcast by displaying a movie signal, and a control method thereof.

In order to achieve the above object, the present invention provides a video device that can be displayed in the movie mode when the video signal received by the video device is a movie signal, the window generating unit for setting a predetermined area of the display screen to the character window area A storage unit for storing video data of the text window area set by the window generating unit, a text broadcasting determination unit comparing the stored video data, and determining whether a signal related to text broadcasting is applied; When a signal related to a text broadcast is applied, the control unit for controlling to display the video signal from the movie mode to the normal video mode to provide a video device supporting a movie mode, characterized in that configured.

The movie mode converts two 24Hz frames into five 60Hz fields, repeats one field in the first frame to create three fields, and two fields in the second frame to create a 3: 2 pull-down. down) mode is preferred.

The predetermined area of the display screen is generally the lower end of the display screen on which the text broadcast is displayed.

The signal related to the text broadcasting may include signals related to text information such as news, weather, and living information, except for movie caption subtitles.

Preferably, the storage unit separately stores video data changed for each field.

The character broadcasting determination unit compares a white image detection unit for detecting whether each pixel of the video data stored in the storage unit is a white image, compares the white image detected by the white image detection unit for each field, and calculates a field phase value. And a phase difference comparator and a character broadcast determination output unit for determining that a signal related to text broadcast is applied when the field phase value calculated by the phase difference comparator is equal to or greater than a predetermined reference value.

Preferably, the white image detection unit detects whether the white image is a white image using only the Y signal among the Y / Cb / Cr signals.

The phase difference comparator sets an absolute constant value gradually increasing in the progress direction of the text broadcasting for each pixel, sets a zero value to a pixel for which a white image is not detected, and sets a previous field at an absolute constant value set for the pixel of the current field. It is preferable to calculate a difference for each pixel by subtracting the absolute constant value set for each pixel of P, and to calculate a field phase value that sums all the difference values calculated for each pixel.

It is preferable that the said predetermined reference value is positive.

In order to achieve the above object, the present invention provides a method of determining whether a video signal received by a video device is a movie signal, and when the video signal received by the video device is a movie signal, displaying the video signal in a movie mode. And determining whether a signal related to text broadcasting is received by the video apparatus, and when the signal relating to text broadcasting is received by the video apparatus, converting the video signal from a movie mode to a general video mode. It provides a control method of a video device supporting a movie mode, characterized in that comprising the step of displaying by.

The movie mode converts two 24Hz frames into five 60Hz fields, repeats one field in the first frame to create three fields, and two fields in the second frame to create a 3: 2 pull-down. down) mode is preferred.

The step of determining whether the signal related to the text broadcast is received by the video device comprises the steps of setting a predetermined area of the display screen as a text window area, storing video data of the set text window area, and And comparing the stored video data to determine whether a signal related to text broadcasting is applied.

The predetermined area of the display screen is generally the lower end of the display screen on which the text broadcast is displayed.

The signal related to the text broadcasting may include signals related to text information such as news, weather, life information, etc., except for movie caption subtitles.

In the storing of the video data of the set text window region, it is preferable to separately store video data changed for each field.

The comparing of the stored video data and determining whether a signal related to a text broadcasting is applied may include detecting whether each pixel of the stored video data is a white image, and detecting the detected white images for each field. And comparing, calculating a field phase value, and determining that a signal related to text broadcasting is applied when the calculated field phase value is equal to or greater than a predetermined reference value.

The detecting of each pixel of the stored video data may be a white image using only a Y signal among Y / Cb / Cr signals.

Comparing the detected white images for each field and calculating a field phase value may include setting, for each pixel, an absolute constant value that gradually increases in a progress direction of a text broadcast, and zero for a pixel for which a white image is not detected. setting a value of zero), calculating a difference for each pixel by subtracting the absolute constant value set for the pixel of the current field from the absolute constant value set for the pixel of the current field, and adding up the difference values calculated for each pixel. It is preferable to include the step of calculating the field phase value.

It is preferable that the said predetermined reference value is positive.

Therefore, according to the present invention, according to the presence or absence of the text broadcasting, it is possible to automatically switch from the movie mode to the normal video mode, there is an effect that can eliminate the phenomenon that the subtitles of the text broadcasting shaking.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

3 is a block diagram showing the configuration of a video device supporting a movie mode according to the present invention. Referring to Figure 3, the signal flow between the components of the video device supporting the movie mode according to the present invention will be described.

As shown in FIG. 3, the main components of the present invention are illustrated, and basic components and signal flows for receiving and displaying a general broadcast signal in a video device are omitted. However, even if the illustration and detailed description of the basic components are omitted, those skilled in the art can understand the video device that supports the film mode of the present invention through FIG.

The imaging device 301 is a device in which the present invention is implemented and includes components to be described later. However, the video device 301 is not particularly limited, and preferably, may include a movie mode display function or a 3: 2 pull-down function.

The movie signal determination unit 302 determines whether the applied video signal is a movie signal or a general video signal.

The image memory unit 303 stores an applied video signal and is used to execute the movie signal determination and de-interlacer unit 304.

The de-interlacer 304 combines the final video signal according to the characteristics of the signal determined by the movie signal determination unit 302.

The display unit 305 controls and outputs an RGB signal or an YPbPr signal for outputting a video signal.

The window generating unit 306 receives control data from the control unit 312 to extract the area where the text broadcasting is output from the image memory unit 303, and selects a specific pixel * line in the text window. Can be set as an area.

The storage unit 307 is a memory used to determine the presence or absence of a text broadcast. The storage unit 307 may extract and store only video data of an area set by the window generator 306 from the image memory unit 303.

The text broadcasting determining unit 308 is a comparator, and compares the video data of the front and rear fields of the storage unit 307 to determine the presence or absence of text broadcasting, and transmits the determined information to the control unit 312.

The controller 312 may include the movie signal determination unit 302, the image memory unit 303, the de-interlacer unit 304, the display unit 305, the window generator 306, the storage unit 307, And it controls the text broadcasting determination unit 308.

The movie signal determination unit 302 determines whether the applied video signal is a general video source or a movie source. As a specific method, the data of the current field and the previous field are stored, and the movements are compared with each other. If the same phase (motion) of the field is repeated for a predetermined period of 3 and 2, it is determined as a movie signal.

On the other hand, if the phase of the field is detected with a different value every time, it is determined as a general video signal.

As a result of the determination of the movie signal determining unit 302, when the applied video signal is a movie signal, the controller 312 controls the de-interlacer unit 304 so that the video signal is displayed in the movie mode. To control. For example, the 3: 2 pull-down function can be executed.

The window generator 306 sets the predetermined area of the display screen as the text window area under the control of the controller 312.

However, as shown in FIG. 4, it is preferable that the predetermined area is generally the lower end of the display screen on which text broadcasting is displayed. Here, the text broadcasting may include broadcasting related to text information, such as news, weather, and life information, except for movie caption subtitles.

For example, when the display screen of the video device is 720 pixels * 480 lines, the predetermined area may be set to 720 pixels * 50 lines. However, the above numerical values are merely examples, and the scope of the present invention is not limited to the above numerical values.

The signal for the set area is transmitted to the image memory unit 303, and the image memory unit 303 transmits video data of the set area to the storage unit 307.

In this case, the storage unit 307 may store video data of the text window area set by the window generation unit 306. More preferably, video data changed for each field may be stored separately. For example, data of the current field may be stored in the second storage and data of the previous field may be stored in the first storage.

The text broadcasting determining unit 308 compares the data of the previous field and the data of the current field stored in the storage unit 307 to determine whether the text broadcasting is received and displayed by the video device 301. Can be.

More specifically, the text broadcasting determining unit 308 includes a white image detecting unit 309, a phase difference comparing unit 310, and a text broadcasting determining output unit 311.

The white image detector 309 may detect whether the pixels of the video data of the previous field and the current field stored in the storage unit 307 are white images. Each of the pixels is composed of Y / Cb / Cr. When only the Y signal is detected and the Y signal has a large signal amount, the white image can be detected by using a high data point. For example, if the video data is 8-bit ADC (Analogue to Digital Converter) processed, it can represent the Y signal in the range of 256 (= 2 ^ 8), and because the character broadcast is mostly close to the white data, about 180 (8 The higher value can be detected as a white image. However, the above figures are only examples.

The phase difference comparator 310 may compare the white images detected by the white image detector 309 by the previous field and the current field, and calculate a field phase value. Detailed description thereof will be described later with reference to FIG. 5.

5 is a diagram illustrating a process of character broadcasting determination unit of a video device supporting a movie mode according to the present invention. Referring to Figure 5, the role of the phase difference comparator 310 of the character broadcast determination unit 308 will be described in detail as follows.

As illustrated in FIG. 5, the phase difference comparator 310 may set an absolute constant value that gradually increases in the progress direction of the text broadcast for each pixel, but may set a zero value to a pixel where a white image is not detected. have.

For example, if the direction of the text broadcast is from right to left as shown in Fig. 5, "1" for the rightmost pixel, "3" for the next left pixel, "5" for the next left pixel, etc. + You can set the value in increments of two. However, a pixel for which a white image is not detected may be regarded as "0". Of course, the scope of the present invention is not limited to the above numerical values, but is merely an example.

FIG. 5A illustrates a value set for the pixel of the current field, and FIG. 5B illustrates a value set for the pixel of the previous field.

The phase difference comparator 310 may calculate a difference obtained by subtracting the absolute constant value set in the pixel of the previous field from the absolute constant value set in the pixel of the current field. This may be calculated for each pixel. For example, when (a) is the current field and (b) is the previous field, the field phase difference, which is the calculated difference value, may be calculated as shown in (c) of FIG. 5. .

The phase difference comparator 310 may sum all the difference values calculated for each pixel, and the sum of all the difference values will be defined as a field phase value. That is, it can be seen that the field phase value in FIG. 5 is 19 + 19 + 19 + 19-17-17-13-13 + 5 + 5 + 5 + 5-3-3-3-3 = 24.

When the calculated field phase value is greater than or equal to a predetermined reference value, the text broadcasting determination output unit 311 determines that a signal related to text broadcasting is being applied, and transmits the determined signal to the controller 312.

In general, when the display direction of the character broadcast moves from the right side to the left side as viewed from the user's point of view, the predetermined reference value is preferably positive. In addition, a positive value of a specific numerical value may be set in consideration of the amount, speed, frequency, text color, and the like of the text broadcasting.

For example, when the display screen is 720 pixels * 480 lines, the predetermined reference value may be set to 500.

The controller 312 receiving the signal determined to be the signal related to the text broadcasting controls the de-interlacer 304 and the display 305 to control the video signal in the movie mode. You can switch to normal video mode to display.

6 is a flowchart (flow chart) showing a control method of an image device supporting a movie mode according to the present invention. Referring to Figure 6, the control method of the video device supporting the movie mode according to the present invention will be described.

It may be determined whether the video signal received by the video device is a movie signal (S601).

As a result of the determination (S601), if it is not a movie signal, the video signal can be displayed in the normal video mode (S605).

As a result of the determination (S601), in the case of a movie signal, the video signal may be displayed in a movie mode (S602). However, the movie mode converts two 24Hz frames into five 60Hz fields, repeats one field in the first frame to create three fields, and creates two fields in the second frame, in a 3: 2 pull-down mode. It is preferable to include.

In operation S603, it may be determined whether a signal related to text broadcasting is received by the video apparatus. Here, the signal related to the text broadcasting may include signals related to text information such as news, weather, and living information, except for movie subtitles.

As a result of the determination (S603), if a signal related to text broadcasting is not received, the process repeats from step S602.

However, when the determination result (S603), when a signal related to text broadcasting is received, the video signal can be displayed by switching the movie mode to a normal video mode (S604).

However, the step S603 will be described in more detail with reference to FIG. 7 as follows. In addition, step S603 includes steps S603-1, S603-2, S603-3, S603-4, and S603-5.

A predetermined area of the display screen may be set as the text window area (S603-1).

However, it is preferable that the predetermined area of the display screen is generally the lower end of the display screen on which text broadcasting is displayed. This can be understood by those skilled in the art through the description of FIG. 4 and the aforementioned FIG. 4 and the description of the window generator.

Video data of the set text window area may be stored (S603-2).

However, in step S603-2, it is preferable to separately store video data changed for each field. This can be understood by those skilled in the art through the above description of the storage unit.

In operation S603-3, it may be detected whether each pixel of the stored video data is a white image.

However, in the step S603-3, it is preferable to detect whether the image is a white image using only the Y signal among the Y / Cb / Cr signals. This can be understood by those skilled in the art through the above-described description of the white image detector.

The detected white images may be compared for each field, and a field phase value may be calculated (S603-4).

However, the step S603-4 corresponds to the function of the phase difference comparator, and can be understood by those skilled in the art through the above-described phase difference comparator.

If the calculated field phase value is equal to or greater than a predetermined reference value, it may be determined that a signal related to text broadcasting is applied (S603-5).

In general, when the display direction of the character broadcast moves from the right side to the left side as viewed from the user's point of view, the predetermined reference value is preferably positive. In addition, a positive value of a specific numerical value may be set in consideration of the amount, speed, frequency, text color, and the like of the text broadcasting.

For example, when the display screen is 720 pixels * 480 lines, the predetermined reference value may be set to 500.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The effects of the video device and the control method supporting the movie mode according to the present invention described above are as follows.

The present invention can prevent the problem that the subtitles of the text broadcasting is incompletely output when receiving a signal related to the movie broadcast, and displayed in the movie mode, it is possible to provide a clearer screen to the user of the video device It works.

Claims (19)

In the video device that can be displayed in the movie mode, if the video signal received by the video device is a movie signal, A window generator configured to set a predetermined area of the display screen as a text window area; A storage unit which stores video data of a text window area set by the window generator; A text broadcasting determining unit which compares the stored video data and determines whether a signal related to text broadcasting is applied; And And a control unit for controlling the video signal to be displayed by switching the video signal from the movie mode to the normal video mode when the signal related to the text broadcast is applied. The method of claim 1, The movie mode, It converts two 24Hz frames into five 60Hz fields, repeats one field in the first frame to create three fields, and creates two fields in the second frame, creating a 3: 2 pull-down mode. Imaging device that supports the movie mode, characterized in that it comprises a. The method of claim 1, The predetermined area of the display screen is In general, the video device that supports the movie mode, characterized in that the lower portion of the display screen on which the text broadcast is displayed. The method of claim 1, The signal related to the text broadcast, A video device supporting a movie mode, including a signal related to text information such as news, weather, and living information, except for movie subtitle subtitles. The method of claim 1, The storage unit, Imaging device that supports the movie mode, characterized in that for storing the video data to be changed for each field separately. The method of claim 1, The character broadcast determination unit, A white image detector for detecting whether each pixel of the video data stored in the storage unit is a white image; A phase difference comparison unit comparing the white images detected by the white image detection unit for each field and calculating a field phase value; And And a character broadcast determination output unit configured to determine that a signal related to a character broadcast is applied when the field phase value calculated by the phase difference comparison unit is equal to or greater than a predetermined reference value. The method of claim 6, The white image detection unit, A video device supporting a movie mode, wherein the Y / Cb / Cr signal detects whether the image is a white image using only the Y signal. The method of claim 6, The phase difference comparison unit, Set an absolute constant that increases gradually in the direction of the text broadcast for each pixel, Set a zero value to pixels for which no white image is detected. Calculate the difference for each pixel by subtracting the absolute value set for the pixel of the current field from the absolute value set for the pixel of the previous field, and And a field phase value obtained by adding up the difference values calculated for each pixel. The method of claim 6, The predetermined reference value is Imaging device that supports the movie mode, characterized in that the positive number. Determining whether the video signal received by the video device is a movie signal; If the video signal received by the video device is a movie signal, displaying the video signal in a movie mode and simultaneously determining whether a signal related to text broadcasting is received by the video device; And And when the signal related to the text broadcast is received by the video device, converting the video signal from the movie mode to the normal video mode and displaying the video signal. . The method of claim 10, The movie mode, Converts two 24Hz frames into five 60Hz fields, repeats one field in the first frame to create three fields, and the second frame creates two fields in 3: 2 pull-down mode. Control method of a video device supporting a movie mode, characterized in that it comprises a. The method of claim 10, Determining whether the signal related to the text broadcast is received by the video device, Setting a predetermined area of the display screen as a text window area; Storing video data of the set text window area; And And comparing the stored video data to determine whether a signal related to a text broadcast is applied or not. The method of claim 12, The predetermined area of the display screen is In general, the method of controlling a video device supporting a movie mode, characterized in that the lower portion of the display screen on which the text broadcast is displayed. The method of claim 10, The signal related to the text broadcast, A control method of an image apparatus supporting a movie mode, including a signal related to text information such as news, weather, and living information, except for movie dialogue subtitles. The method of claim 12, The storing of the video data of the set text window area may include: Control method of a video device supporting a movie mode, characterized in that for storing the video data changed for each field separately. The method of claim 12, Comparing the stored video data, determining whether a signal related to a text broadcast is applied, Detecting whether each pixel of the stored video data is a white image; Comparing the detected white images for each field and calculating a field phase value; And And determining that a signal related to a text broadcast is applied when the calculated field phase value is equal to or greater than a predetermined reference value. The method of claim 16, Detecting whether each pixel of the stored video data is a white image, A control method of a video device supporting a movie mode, characterized in that the Y / Cb / Cr signal, using only the Y signal to detect whether the white image. The method of claim 16, Comparing the detected white image for each field, and calculating a field phase value, Setting an absolute constant value that gradually increases in the progress direction of the text broadcasting for each pixel; Setting a zero value to a pixel for which a white image is not detected; Calculating a difference for each pixel by subtracting the absolute constant value set for the pixel of the current field from the absolute constant value set for the pixel of the current field; And And calculating a field phase value obtained by adding up the difference values calculated for each pixel. The method of claim 16, The predetermined reference value is Control method of a video device supporting a movie mode, characterized in that the positive number.

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