JP4611787B2 - Television receiver and vertical position adjustment method - Google Patents

Description

  The present invention relates to a television receiver having an auto-wide function and a vertical position adjusting method.

  In recent television receivers, not only can you select your preferred screen size by manual operation, but you can also set the screen size to automatically switch depending on the content of the received broadcast or externally input video software. It can be done.

  Here, the screen size includes “normal” for displaying an image of a normal TV screen (4: 3 size) as it is, “cinema” for displaying Sineseco or 16: 9 size video software on the entire screen, and 16: 9. There are two types: “full”, where the video compressed to 4: 3 is restored to the original 16: 9 and projected to the full screen, and “wide”, where normal 4: 3 video is projected to the full screen.

  In addition, such a television receiver has an auto-wide function for automatically setting a screen size by identifying a video screen size control signal. Examples of the auto-wide function include a video discrimination function, an S2-compatible function, a D terminal identification function, and the like.

  The video discriminating function is a function that automatically sets the screen size to “cinema” when there are black bands above and below the received broadcast or externally input software video. Here, “cinema” is a display mode in which, as described above, the image is enlarged to the left and right of the screen without losing the aspect ratio of the input signal.

  The S2-compatible function automatically optimizes the optimal screen size when a video containing a screen size control signal (full mode control signal or letterbox control signal) is input when a DVD player or the like is connected with an S video cable. Is the display mode.

  The D terminal identification function automatically optimizes the screen when a video with a screen size control signal (full mode control signal or letterbox control signal) is input when a DVD player or the like is connected with a D terminal cable. This is the display mode for size.

  Here, the full mode control signal and the letterbox control signal are signals indicating that the video (screen size) has an aspect ratio of 16: 9. The full mode is a mode in which the original 16: 9 video is displayed on the entire screen, and the letterbox is displayed on the 16: 9 video included in the 4: 3 screen in the full screen. Mode.

  By the way, of the above-described auto-wide functions, for example, in the video discrimination function, when the screen size is automatically set to “cinema”, the video end position (video last line in the horizontal scanning line) and subtitle end position (horizontal scanning line) The vertical position of the screen was adjusted by determining the presence or absence of subtitles from the difference from the subtitle final line.

  That is, for example, as shown in FIG. 6, when the caption final line (b) is larger than the video final line (a), the lower part of the video is displayed as the caption display area 1. In this case, the video final line (a) and the caption final line (b) are detected several times, and the respective positions are set as definite values.

  Here, when discriminating between the video final line (a) and the caption final line (b), for example, a histogram of the video signal for each horizontal scanning line is generated, and the characteristics of the video part and the caption part are found from the histogram, In some cases, a method of determining the last line of the first line is used.

  That is, the video part has a distribution that spreads over the entire luminance level and does not have a characteristic distribution, but the subtitle part has a feature that the distribution of the luminance level is high because the background is a dark part. From this, the final line of each is determined.

  By the way, depending on the video, a dark region may be displayed by the telop display 3 or the like below the video display region 2 surrounded by a dotted line. In such a case, if the brightness level distribution at the position of the dark area becomes high, the position may be recognized as the final video line and the final caption line (c), and there is no caption. In some cases, it is determined that there is a caption, and the lower part of the video is displayed as the caption display area 1.

Incidentally, in Patent Document 1, in a television receiver provided with a horizontally long display, vertical enlargement means, and reduction display means, when the input video signal is video software, the input video signal is output by the vertical enlargement means. Is displayed in the blanking period (non-image area) by reducing the vertical period and displaying the period near the subtitles in the video signal in the vertical direction. However, it has proposed a technology that enables powerful display without missing subtitles.
Japanese Patent Laid-Open No. 07-154712

  By the way, in Patent Document 1, it is effective to prevent subtitles from being missing from video software in which the subtitles are in the blanking period (no-image portion).

  However, since such a technique does not include means for determining the presence or absence of subtitles from the positions of the video final line and the subtitle final line, as described above, the telop display 3 or the like below the video display area 2. If a dark area is displayed, the position of the dark area is recognized as the final video line and the final caption line (c), and it is determined that there is no caption even though there is no caption. Therefore, the lower part of the video may be erroneously displayed as the subtitle display area 1.

  The present invention has been made in view of such a situation. An auto that causes the lower part of the video to be displayed as a subtitle display area by determining that the subtitle is present even though there is no subtitle. It is an object of the present invention to provide a television receiver and a vertical position adjustment method that can reliably prevent erroneous determination that causes erroneous display in a wide function.

The television receiver of the present invention is a television receiver having an auto-wide function, and a video processing means for performing video processing related to screen size adjustment according to at least an aspect ratio with respect to a video signal, and video processing. Display means for displaying an image based on the received signal, and determining the presence or absence of a black band from the video signal, and if there is a black band, between the frames before and after the video signal, Line discriminating means for discriminating the position with the last caption line, and control means for controlling video processing relating to at least screen size adjustment in the video processing means in accordance with a discrimination result by the line discriminating means, the line discriminating means Compares the luminance level with the reference level for each horizontal scanning line of the video signal and the horizontal scanning line at the time of comparison A horizontal line luminance discriminating unit that counts the position; a video final line detection circuit that detects the video final line from the luminance level of each of the compared horizontal scanning lines; and the luminance level of each of the compared horizontal scanning lines. A subtitle final line detection circuit for detecting a subtitle final line, and after the match between each of the detected video final line and the subtitle final line is confirmed several times, the detected video final line and subtitle final line are A memory for storing at least one frame of the video signal as a confirmed video line and a confirmed subtitle line with the values counted when compared in the horizontal line luminance discriminating unit, and the previous frame stored in the memory The value of the confirmed video line is compared with the value of the confirmed subtitle line of the current frame, and the comparison result is sent to the control means. The display means based on the aspect conversion data for determining the size of the video according to the comparison result of the line comparison circuit output from the control means. The display means based on the vertical position adjustment data for determining the vertical position of the video according to the comparison result of the line comparison circuit output from the control means and the aspect conversion circuit for determining the size of the video to be projected on A vertical position conversion circuit that determines a vertical position of a video to be projected on the display, and the control means determines that the position of the final video line and the final caption line are the same based on the determination result of the line determination means Or if the position of the final caption line is smaller than the final video line, the aspect conversion data and vertical position adjustment By not outputting data, the vertical position of the video is not adjusted .
In such a configuration, when the auto-wide function is executed, the line discriminating unit determines the presence or absence of a black band from the video signal, and if there is a black band, between the frames before and after the video signal, The positions of the video final line and the caption final line in the horizontal scanning line are determined, and the screen size is adjusted by the control means in accordance with the determination result of the determined position of the video final line and the caption final line.
Accordingly, for example, when a dark area is displayed below the video display area by telop display or the like, and it is determined that the position of the dark area is, for example, the video final line and the caption final line, the position of the caption final line is incorrect. It can be recognized as a determination.
In addition, when the position of the video final line and the caption final line are the same as a result of the discrimination by the line discrimination means, or when the position of the caption final line is smaller than the video final line, the control means transfers the aspect conversion circuit to the aspect conversion circuit. Since the aspect conversion data and the vertical position adjustment data are not output to the vertical position conversion circuit, appropriate display can be performed according to the presence or absence of subtitles.
Further, the horizontal line luminance discriminating unit compares the luminance level with the reference level for each horizontal scanning line of the video signal, and the horizontal scanning line position at the time of comparison is counted and compared by the video final line detection circuit. The final video line is detected from the luminance level for each horizontal scan line, and the final caption line is detected from the compared luminance level for each horizontal scan line by the caption final line detection circuit. Then, after the coincidence between the detected final video line and the final caption line is confirmed several times, the line is compared with the counted value in the memory as a final video line and a final subtitle line. Thus, the stored value of the confirmed video line is compared with the value of the confirmed subtitle line, and the comparison result is output to the control means, so that the video final line and the subtitle final line between the previous and subsequent frames are Position comparison can be performed reliably.
The vertical position adjustment method of the present invention is a vertical position adjustment method in a television receiver having an auto-wide function, and a video processing step for performing video processing related to screen size adjustment according to at least an aspect ratio for a video signal And a display step of displaying video based on the video-processed signal, and the presence or absence of a black band from the video signal. If there is a black band, a horizontal scanning line is inserted between frames before and after the video signal. A line discriminating step for discriminating the positions of the video final line and the subtitle final line, and a control step of controlling video processing related to at least the screen size adjustment according to the result of the discriminating , For each horizontal scanning line, the luminance level is compared with the reference level, and the horizontal line that counts the position of the horizontal scanning line at the time of comparison is counted. A luminance determining step; a video final line detecting step for detecting the final video line from the luminance level for each of the compared horizontal scanning lines; and a subtitle final line from the luminance level for each of the compared horizontal scanning lines. After the subtitle final line detection step and the coincidence between the detected video final line and the subtitle final line are confirmed several times, the detected video final line and the subtitle final line are determined by the horizontal line luminance determination unit. A storage step of storing at least one frame of the video signal as a confirmed video line and a confirmed subtitle line with the values counted when compared, and the stored value of the confirmed video line one frame before, A comparison result output step of comparing the value of the confirmed subtitle line of the current frame and outputting the comparison result; An aspect conversion step for determining the size of the video to be projected based on the aspect conversion data for determining the size of the video according to the comparison result, and a vertical position for determining the vertical position of the video according to the comparison result A vertical position converting step for determining a vertical position of the video to be projected based on the adjustment data, and from the result of determining the position of the video final line and the caption final line, the video final line and the caption final line If the positions of the subtitles are the same, or if the position of the subtitle final line is smaller than the video final line, the aspect conversion data and the vertical position adjustment data are not output, thereby adjusting the vertical position of the video. It is characterized by not being.
In such a configuration, when the auto-wide function is executed, the presence or absence of a black band is determined from the video signal, and if there is a black band, the video on the horizontal scanning line is between the frames before and after the video signal. The positions of the final line and the closed caption final line are determined, and the screen size is adjusted according to the determined determination result of the position of the determined final video line and closed caption final line.
Accordingly, for example, when a dark area is displayed below the video display area by telop display or the like, and it is determined that the position of the dark area is, for example, the video final line and the caption final line, the position of the caption final line is incorrect. It can be recognized as a determination.
In addition, if the position of the video final line and the subtitle final line are the same, or if the position of the subtitle final line is smaller than the video final line, the aspect conversion data and the vertical position adjustment data are not output. Appropriate display can be performed according to the presence or absence of subtitles.
In addition, the luminance level is compared with the reference level for each horizontal scanning line of the video signal, the position of the horizontal scanning line at the time of comparison is counted, and the final video line is detected from the compared luminance level for each horizontal scanning line. The final caption line is detected from the compared luminance levels for each horizontal scanning line. Then, when the determined video line and the determined subtitle line are stored in the memory in the same manner as described above, the stored determined video line value is compared with the determined subtitle line value, Since the comparison result is output, it is possible to reliably compare the positions of the final video line and the final caption line between the previous and subsequent frames.

  According to the television receiver and vertical position adjustment method of the present invention, the line discriminating unit discriminates the presence or absence of a black band from the video signal, and if there is a black band, between the frames before and after the video signal. Since the position of the final video line and the final caption line in the horizontal scanning line is determined, and the screen size is adjusted by the control means according to the determination result of the determined position of the final video line and the final caption line. For example, if a dark area is displayed below the video display area by telop display or the like, and it is determined that the position of the dark area is, for example, the video final line and the caption final line, the position of the caption final line is erroneously determined. It can be recognized that there is no subtitle, but it is determined that there is subtitles, so that the lower part of the video is displayed as a subtitle display area. The erroneous determination result in erroneous display in the auto wide function as put away can be reliably prevented.

  In the present embodiment, the line discriminating means discriminates the presence or absence of a black band from the video signal, and if there is a black band, the video final line and subtitle final in the horizontal scanning line between the frames before and after the video signal. The position of the line is discriminated, and the control means adjusts the screen size in accordance with the discriminated result of the position of the discriminated final video line and the final caption line. For example, a telop is displayed below the video display area. For example, if a dark area is displayed and the position of the dark area is determined to be, for example, the final video line and the final caption line, the position of the final caption line is recognized as an erroneous determination, and there is no caption. Regardless of this, it is possible to display errors in the auto-wide function that cause the lower part of the video to be displayed as the caption display area by determining that captions are present. Las misjudgment was to be able to reliably prevented.

Embodiments of the present invention will be described below.
FIG. 1 is a block diagram showing an embodiment of a television receiver of the present invention, FIG. 2 is a block diagram showing details of a video processing circuit and a line discriminating circuit in FIG. 1, and FIGS. It is a figure for demonstrating the vertical position adjustment method in the television receiver of this.

  As shown in FIG. 1, the television receiver includes an AV selector 10, a decoder 20, a video processing circuit 30, a liquid crystal display 40, a line determination circuit 50, a microcomputer 60, and a ROM 70.

  The AV selector 10 selects a video to be viewed from one of the input systems of the tuner 11 and the external input devices 12 and 13. The decoder 20 converts any analog video signal selected by the AV selector 10 into a digital video signal.

  The video processing circuit 30 as the video processing means includes a scaler 31 that performs video-related processing relating to at least screen size adjustment on the digital video signal from the decoder 20. The liquid crystal display 40 as a display means displays a video based on the video processed signal from the video processing circuit 30.

  A line discriminating circuit 50 as a line discriminating unit discriminates the presence / absence of a black band from the digital video signal from the decoder 20, and when there is a black band, the line in the horizontal scanning line between the frames before and after the digital video signal. The position of a video final line (d) and a caption final line (e), which will be described later, is determined, and details thereof will be described later.

  The microcomputer 60 as a control unit has an auto-wide function, and outputs aspect conversion data and vertical position adjustment data to the scaler 31 of the video processing circuit 30 according to the determination result from the line determination circuit 50 and the like. The ROM 70 stores at least aspect conversion data and vertical position adjustment data.

  Here, as the auto-wide function, “normal” which displays an image of a normal television screen (4: 3 size) as it is, “cinema” which displays Sinesco or 16: 9 size image software in a full screen, 16: There is "full" that displays the video compressed from 9 to 4: 3 back to the original 16: 9 and fills the screen, and "wide" that projects normal 4: 3 video to fill the screen. One of them is set in accordance with.

  Next, details of the video processing circuit 30 and the line determination circuit 50 will be described.

  As shown in FIG. 2, the scaler 31 of the video processing circuit 30 includes an aspect conversion circuit 32 and a vertical position conversion circuit 33.

  The aspect conversion circuit 32 determines the size of an image to be displayed on the liquid crystal display 40 based on the aspect conversion data from the microcomputer 60.

  The vertical position conversion circuit 33 determines the vertical position of the video to be displayed on the liquid crystal display 40 based on the vertical position adjustment data from the microcomputer 60.

  The line determination circuit 50 includes a horizontal line luminance determination unit 51, a video final line detection circuit 54, a caption final line detection circuit 55, a memory 56, and a line comparison circuit 57.

  The horizontal line luminance determination unit 51 includes a comparator 52 that compares the luminance level of the digital video signal with a reference level for each horizontal scanning line, and a counter 53 that counts the position of the horizontal scanning line at the time of comparison. Here, the luminance level can be expressed in a range of “black (0) to halftone to white (255)”.

  The video final line detection circuit 54 shows the final line of the horizontal scanning line having a distribution of low luminance, intermediate luminance, and high luminance from the luminance level for each horizontal scanning line determined by the horizontal line luminance determining unit 51, as shown in FIG. Thus, it detects as a video last line (d).

  The subtitle final line detection circuit 55 calculates the final line of the horizontal scanning line having a low luminance and high luminance distribution without intermediate luminance from the luminance level for each horizontal scanning line determined by the horizontal line luminance determining unit 51, as shown in FIG. As shown in Fig. 4, it is detected as the last caption line (e).

  Therefore, when the subtitle final line detection circuit 55 detects the subtitle final line (e), the microcomputer 60 determines that there is a subtitle, and the vertical position of the video is the subtitle final line (e) as shown in FIG. ) So that it can be expanded.

  On the other hand, when the video final line (d) detected by the video final line detection circuit 54 and the caption final line (e) detected by the caption final line detection circuit 55 are equal, the microcomputer 60 determines that there is no caption. Then, as shown in FIG. 4, the vertical position of the video is not adjusted, and the video reaches the final video line (d).

  The memory 56 stores the video final line (d) detected by the video final line detection circuit 54 and the caption final line (e) detected by the caption final line detection circuit 55. Note that the video final line (d) and the caption final line (e) stored in the memory 56 may be at least one frame of the video signal. Further, the video final line (d) and the caption final line (e) can be identified by the count value of the counter 53.

  The line comparison circuit 57 compares the video last line (d) of the previous frame stored in the memory 56 with the caption final line (e) of the current frame detected by the caption final line detection circuit 55, and compares the comparison. The result is given to the microcomputer 60.

  Then, based on the comparison result from the line comparison circuit 57, the microcomputer 60 determines that there is a caption when the caption final line (e) is larger than the video final line (d), and the aspect conversion circuit 32 and the vertical conversion circuit 32 The aspect conversion data and the vertical position adjustment data are output to the position conversion circuit 33, and control is performed so that a normal 4: 3 image is displayed on the entire screen.

  On the other hand, based on the comparison result from the line comparison circuit 57, the microcomputer 60 determines that the position of the final video line (d) and the final caption line (e) are the same, or the final caption line (e) position is the video. If it is smaller than the position of the final line (d), it is determined that there is an error in the position of the final caption line (e), and the aspect conversion data and vertical position adjustment data to the aspect conversion circuit 32 and the vertical position conversion circuit 33 are determined. Is not output.

Next, a method for adjusting the vertical position of the video will be described.
In the following, when the auto-wide function is set according to an instruction from the user and the line discriminating circuit 50 determines that the digital video signal output from the decoder 20 has a black band, the microcomputer 60 described above. It is assumed that the auto wide function in the “cinema” mode is executed.

  First, as shown in FIG. 5, when the auto-wide function is set by the microcomputer 60 (step S1), the video signal of an arbitrary frame is determined based on the determination result from the horizontal line luminance determination unit 51 of the line determination circuit 50. Whether or not there is a black belt is determined (step S2).

  When it is determined that the video signal has a black belt, the video final line detection circuit 54 calculates the distribution of low luminance, intermediate luminance, and high luminance from the luminance level for each horizontal scanning line determined by the horizontal line luminance determining unit 51. The final horizontal scanning line is detected as the final video line (d) shown in FIG.

  The final video line (d) is recorded as a final video line in the memory 56 when the final horizontal scanning line coincides several times (step S3). Here, “matching several times” means confirming the position of the last line of the horizontal scanning line over several frames.

  Then, the aspect conversion data is output from the microcomputer 60 to the aspect conversion circuit 32, and switching to the “cinema” mode is performed (step S4).

  Next, the presence / absence of subtitles is determined (step S5). Here, the final line of the horizontal scanning line having low luminance and high luminance distribution without intermediate luminance from the luminance level for each horizontal scanning line determined by the horizontal line luminance determining unit 51 by the caption final line detection circuit 55 is obtained. It is detected as the caption final line (e) shown in FIG.

  The caption final line (e) is recorded as a confirmed caption line in the memory 56 when the final line of the horizontal scanning line is matched several times (step S6). Here, “matching several times” means confirming the position of the last line of the horizontal scanning line over several frames. Also, each video final line (d) and caption final line (e) are identified by a count value by the counter 53.

  Next, the line comparison circuit 57 compares the confirmed video line stored in the memory 56 with the confirmed subtitle line (step S7).

  Then, when the confirmed subtitle line is larger than the confirmed video line based on the comparison result from the line comparison circuit 57, the microcomputer 60 determines that there is a caption, and sends the aspect conversion data to the aspect conversion circuit 32 and the vertical position conversion circuit 33. Then, by outputting the vertical position adjustment data, the vertical position of the video is adjusted as shown in FIG. 3 (step S8).

  On the other hand, if the positions of the confirmed video line and the confirmed subtitle line are the same by the comparison in (Step S7), or if the position of the confirmed subtitle line is smaller than the position of the confirmed video line, the microcomputer 60 Therefore, it is determined that there is an error in the detection position of the caption final line (e), and the aspect conversion data and the vertical position adjustment data are not output to the aspect conversion circuit 32 and the vertical position conversion circuit 33, as shown in FIG. As such, the vertical position of the image is not adjusted.

  In the comparison between the confirmed video line stored in the memory 56 and the confirmed subtitle line in (Step S7), the number of frames for confirming the position of the final line of the horizontal scanning line in order to increase the accuracy of comparison. Is preferably increased to some extent.

  As described above, in this embodiment, the line determination circuit 50 determines the presence or absence of a black band from the video signal, and if there is a black band, the video on the horizontal scanning line between the frames before and after the video signal. The positions of the final line and the final caption line are determined, and the microcomputer 60 adjusts the screen size in accordance with the determination result of the determined position of the final video line and the final caption line. When a dark area is displayed below by a telop display or the like, and it is determined that the position of the dark area is, for example, the final video line and the final caption line, the position of the final caption line may be recognized as an erroneous determination. Auto, which displays the lower part of the video as a subtitle display area by determining that there is subtitles even though there are no subtitles The erroneous determination result in erroneous display of id functions can be reliably prevented.

  Further, in the present embodiment, when the determination result in the line determination circuit 50 indicates that the position of the video final line and the caption final line are the same, or the position of the caption final line is smaller than the video final line, the microcomputer 60 Since the aspect conversion data to the aspect conversion circuit 32 and the vertical position adjustment data to the vertical position conversion circuit 33 are not output, appropriate display can be performed according to the presence or absence of subtitles.

  In the present embodiment, the horizontal line luminance discriminating unit 51 compares the luminance level with the reference level for each horizontal scanning line of the video signal, counts the position of the horizontal scanning line at the time of comparison, and detects the final video line detection. The circuit 54 detects the final video line from the luminance level for each horizontal scanning line compared, and the subtitle final line detection circuit 55 detects and detects the final caption line from the luminance level for each horizontal scanning line compared. After the match between the final video line and the final caption line is confirmed several times, the memory 56 stores the determined video line and the final subtitle line as counted values. The stored value of the confirmed video line is compared with the value of the confirmed subtitle line, and the comparison result is sent to the microcomputer 60. Since the force, it is possible to reliably compare the positions of the picture last line and subtitle final line between the front and rear frames.

  The present invention can be applied not only to a television receiver but also to a device that displays an image such as a computer display.

It is a block diagram which shows one Embodiment of the television receiver of this invention. FIG. 2 is a block diagram illustrating details of a video processing circuit and a line determination circuit in FIG. 1. It is a figure for demonstrating the vertical position adjustment method in case the subtitles exist in the television receiver of FIG. It is a figure for demonstrating the vertical position adjustment method in the case of no subtitles in the television receiver of FIG. 3 is a flowchart for explaining a vertical position adjustment method in the television receiver of FIG. 1. It is a figure for demonstrating the vertical position adjustment method in the conventional television receiver.

Explanation of symbols

10 Selector
11 Tuner
12, 13 External input device
20 Decoder
30 Video processing circuit
31 Scaler
32 Aspect conversion circuit
33 Vertical position conversion circuit
40 Liquid crystal display 50 Line discrimination circuit
51 Horizontal line brightness discriminator
52 Comparator
53 counter
54 Video last line detection circuit
55 Subtitle final line detection circuit
56 memory
57 Line comparison circuit
60 microcomputer
70 ROM

Claims (2)

A television receiver having an auto-wide function,
Video processing means for performing video processing related to screen size adjustment according to at least the aspect ratio of the video signal;
Display means for displaying video based on the video processed signal;
Line discriminating means for discriminating the presence or absence of a black belt from the video signal and, when there is a black belt, discriminating the positions of the video final line and the caption final line in a horizontal scanning line between frames before and after the video signal When,
Control means for controlling video processing related to at least screen size adjustment in the video processing means in accordance with the discrimination result by the line discrimination means ,
The line discriminating means
A horizontal line luminance determination unit that compares the luminance level with a reference level for each horizontal scanning line of the video signal and counts the position of the horizontal scanning line at the time of comparison,
A video final line detection circuit for detecting the video final line from the luminance level of each of the compared horizontal scanning lines;
A caption final line detection circuit that detects the caption final line from the luminance level of each of the compared horizontal scanning lines;
It is counted when the detected video final line and subtitle final line are compared in the horizontal line luminance discriminating unit after the coincidence of the detected video final line and subtitle final line is confirmed several times. A memory for storing at least one frame of the video signal as a confirmed video line and a confirmed subtitle line, respectively,
A line comparison circuit that compares the value of the confirmed video line of the previous frame stored in the memory with the value of the confirmed subtitle line of the current frame and outputs the comparison result to the control means;
The video processing means includes
An aspect conversion circuit for determining a size of a video to be displayed on the display unit based on aspect conversion data for determining a size of a video according to a comparison result of the line comparison circuit output from the control unit;
A vertical position conversion circuit for determining a vertical position of an image to be displayed on the display means on the basis of vertical position adjustment data for determining a vertical position of an image according to a comparison result of the line comparison circuit output from the control means And
The control means, from the determination result in the line determination means, if the position of the video final line and the caption final line are the same, or if the position of the caption final line is smaller than the video final line, The television receiver , wherein the vertical position of the video is not adjusted by not outputting the aspect conversion data and the vertical position adjustment data . A vertical position adjustment method in a television receiver having an auto-wide function,
A video processing step for performing video processing related to screen size adjustment according to at least the aspect ratio of the video signal;
A display process for displaying video based on the video processed signal;
A line determination step of determining presence / absence of a black band from the video signal and determining a position of a video final line and a caption final line in a horizontal scanning line between frames before and after the video signal when there is a black band. When,
A control process for controlling video processing related to at least the screen size adjustment according to the result of the determination of the position ,
A horizontal line luminance determination step for comparing the luminance level with a reference level for each horizontal scanning line of the video signal and counting the position of the horizontal scanning line at the time of comparison,
A video final line detection step of detecting the video final line from the luminance level for each of the compared horizontal scanning lines;
A closed caption final line detecting step of detecting the closed caption final line from the luminance level of each of the compared horizontal scanning lines;
It is counted when the detected video final line and subtitle final line are compared in the horizontal line luminance discriminating unit after the coincidence of the detected video final line and subtitle final line is confirmed several times. A storage step of storing at least one frame of the video signal as a confirmed video line and a confirmed subtitle line, respectively,
A comparison result output step of comparing the stored value of the final video line one frame before and the final caption line value of the current frame and outputting the comparison result;
Further, based on the aspect conversion data for determining the size of the video according to the comparison result, an aspect conversion step for determining the size of the video to be projected,
A vertical position converting step for determining a vertical position of an image to be projected based on vertical position adjustment data for determining a vertical position of the image according to the comparison result;
When the position of the video final line and the subtitle final line are the same, or the position of the subtitle final line is smaller than the video final line, based on the determination result of the positions of the video final line and the caption final line. The vertical position adjustment method is characterized in that the vertical position of the video is not adjusted because the aspect conversion data and the vertical position adjustment data are not output .

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