JP2005203933A - Video-reproducing apparatus and video-reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the nonconformity wherein a magnification/reduction ratio is sometimes changed, depending on the presence/absence of caption display, independently of the display size of the main video image and a caption display part is sometimes missing, due to wrong detection of caption display and wrong setting of the magnification/reduction rate accompanied by a delay in detection processing, in automatic zooming. <P>SOLUTION: A video-reproducing apparatus detects a black stripe part of a reproduction source, depending on the luminance of a main video image, calculates the magnification/reduction ratio depending on the black stripe part and a display area of a display apparatus, applies magnification reduction processing only to the main video image, adds a sub video image to the main video image at its post stage and provides an output of the result so that change in the magnification/reduction ratio due to the presence/absence of caption display is not produced, easy-to-see image can be displayed and missing in a caption accompanying the magnification/reduction is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a video playback apparatus that plays back video data in which sub-video data such as subtitles is incorporated in a recording medium or transmission communication.

  In a display that displays video, the output display area of the received video signal and the display area of the display do not always match. If they do not match, it is possible to display a video that shows the entire display at the expense of being partially clipped, or at the expense of having to output a small video that does not use the entire display. There are two options for video output to display complete video information. This selection depends on the viewer's preference or can be preprogrammed. If the user chooses to display an image showing the entire display, an effective display portion of the image signal to be displayed is obtained, and a process of zooming (enlarging) in the vertical and horizontal directions as necessary is required. Currently, television receivers generally have a function of obtaining an effective video signal area from the input video signal and zooming in the vertical and horizontal directions in accordance with the output display (patent). Reference 1).

  FIG. 8 is a block diagram of the television receiver with a zoom function. In FIG. 8, 800 is a TV main body with a zoom function, 801 is an antenna input, 802 is an external input input, 803 is a tuner, 804 is a video switch, 805 is a video enlargement / reduction processor, and 806 is a display screen. A broadcast signal is received from the antenna input 801 by the tuner 803, converted into a video signal, and input to the video switch 804. A video signal from a video playback device such as a DVD or a video is input to the video switch 804 via the external input 802. The video signal to be displayed on the screen is selected by the viewer using the video switch 804, and the selected video signal is subjected to enlargement / reduction processing so as to be applied to the display screen by the video enlargement / reduction processor 805. An image is displayed at 806.

In such a configuration, when a video playback signal from a video playback device such as a DVD that displays subtitles in a letterbox area of a wide screen material such as a movie is input from an external input and displayed, the subtitles are displayed irregularly. However, there is a problem that the magnification of the displayed video changes frequently due to the presence or absence of subtitle display, and it is very difficult to see, and there are false detection of subtitle display and delay of detection processing. There is a problem that the subtitle display is cut off from the display area.
Japanese National Patent Publication No. 10-513015

  The problem to be solved is that the enlargement / reduction ratio changes frequently depending on the presence or absence of subtitle display regardless of the display size of the main video, and the enlargement / reduction ratio due to false detection of subtitle display or detection processing delay This means that the subtitle display part due to incorrect setting is lost.

  The present invention reproduces video data in which sub-video data such as subtitles such as a DVD is incorporated in order to eliminate the change in the enlargement ratio of the display video with or without subtitle display and prevent the subtitles from being cut off from the display area. In the video reproducing apparatus, the main feature is to enlarge / reduce only the main video.

  The video playback apparatus of the present invention detects the black band portion of the playback material based on the luminance of the main video before the addition of the main video and the sub video, and enlarges / reduces by the display area of the display to display the black band portion. The ratio is calculated, the enlargement / reduction process is performed only on the main video, and the sub-video is added to the main video and output at the subsequent stage. There is an advantage that subtitles are not lost due to enlargement / reduction. In addition, by continuously processing black band detection by luminance for each frame of the main video, the enlargement / reduction ratio is automatically changed according to changes in the time axis of the video playback material without user setting. There is also an effect that can be made.

  The invention described in claim 1 has a main video decoding means and a sub video decoding means, and adds and outputs the main video signal output from the main video decoding means and the sub video signal output from the sub video decoding means. In the playback device, black band portion detecting means for detecting the black band portion of the main video from the luminance of the main video signal, the picture quality of the reproduction material, the display quality of the display, and the black band output from the black band portion detecting means. An enlarged value reduction value calculating means for calculating a ratio of enlargement / reduction of the main video based on the information of the part, a horizontal enlargement / reduction means for the main video, and a vertical enlargement / reduction means for the main video, the enlarged value reduction value Based on the horizontal enlargement / reduction value and the vertical enlargement / reduction value obtained by the calculation means, the horizontal enlargement / reduction means and the vertical enlargement / reduction means adjust the enlargement / reduction of the main video so that the black band portion is not displayed on the display. Sea urchin was constructed.

  According to the second aspect of the present invention, the main video to be reproduced is divided into three areas by two boundary lines in the vertical direction, and the maximum luminance value, the average luminance value, and the minimum luminance value of each of the three areas are calculated. The boundary position of the area in which the maximum luminance value, the average luminance value, and the minimum luminance value are the same value, and the calculated maximum luminance value, average luminance value, and minimum luminance value are smaller than the luminance value determined to be a black belt portion Is detected while moving the two boundary lines up and down, and a portion other than the area sandwiched between the two boundary lines at the detected boundary position is determined as a black belt portion.

  The invention described in claim 3 has black belt detecting means for detecting a black band portion by the method described in claim 2.

  According to the fourth aspect of the present invention, the initial positions of the two boundary lines that are moved up and down for the detection of the black belt portion detection are determined based on the picture information of the reproduction material.

  According to the fifth aspect of the present invention, the main video to be reproduced is divided into three areas in the vertical direction by two boundary lines, and the maximum luminance value, the average luminance value, and the minimum luminance value of each of the three areas are calculated. The boundary position of the area in which the maximum luminance value, the average luminance value, and the minimum luminance value are the same value, and the calculated maximum luminance value, average luminance value, and minimum luminance value are smaller than the luminance value determined to be a black belt portion The two boundary lines are detected while moving up and down, and of the two boundary lines at the detected boundary position, m lines above the boundary line located above and n lines above the boundary line located below The lower part from the bottom (m and n are integers) is determined as the black belt part.

  The invention described in claim 6 has black band detecting means for detecting a black band part by the method described in claim 5.

  According to the seventh aspect of the present invention, after the black belt portion is once detected, the luminance K of the upper k line and the luminance L of the lower l line of the boundary line positioned on the two boundary lines dividing the area. And the luminance M of the upper m-th line and the luminance N of the lower n-line of the lower boundary line are calculated, and the value of the luminance K or the luminance N is greater than the luminance value determined as the black belt portion. When it becomes larger and when the value of the luminance L or the luminance M becomes smaller than the luminance value determined as the black belt portion, the black belt portion detection is restarted.

  According to the eighth aspect of the present invention, the maximum luminance Kmax, the average luminance Kave, and the minimum luminance Kmin of the area from the boundary line located above the two boundary lines that divide the area to the upper end after the black belt portion is once detected. And the maximum brightness Lmax, average brightness Level, and minimum brightness Lmin of the area from the upper boundary line to the lower l line, and the maximum brightness of the area up to the m line above the boundary line positioned below the two boundary lines Mmax, average luminance Mave, minimum luminance Mmin, maximum luminance Nmax from the lower boundary line to the lower end, average luminance Nave, and minimum luminance Nmin are calculated, and Kmax, Kave, and Kmin are not equal, or the black belt portion The luminance value determined when Nmax, Nave, and Nmin are not equal or the black band portion is determined to be greater than the determined luminance value. Mmax and Kmax, Kave, and Kmin are equal to each other and smaller than the luminance value determined to be the black band portion, and Lmax, Lave, and Lmin are equal to and smaller than the luminance value determined to be the black band portion. When Mave and Mmin are equal and smaller than the luminance value determined as the black band portion, and Nmax, Nave and Nmin are equal and smaller than the luminance value determined as the black band portion, the black band portion detection is restarted.

  The invention described in claim 9 has black band detecting means for detecting a black band part by the method described in claim 7.

  The invention described in claim 10 has black band detecting means for detecting a black band portion by the method described in claim 8.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 shows the black band portion of the main video detected from the luminance of the main video signal in the embodiment of the present invention, and based on the picture quality of the playback material, the picture quality of the display to be displayed, and the detected black band part information. FIG. 2 is a block diagram of a video reproducing apparatus configured to output a video signal so as to be enlarged and reduced in a horizontal direction and a vertical direction so that a black belt portion is not displayed on the display.

  In FIG. 1, 100 is a main video decoding means, 101 is a horizontal enlargement / reduction means, 102 is a vertical enlargement / reduction means, 103 is a video signal addition means, 104 is an enlarged value reduction value calculation means, 105 is a black belt portion detection means, 106 is Sub-picture decoding means.

  FIG. 2 is an internal block diagram of the black belt portion detecting means in the video reproduction apparatus of FIG.

  In FIG. 2, reference numeral 200 denotes a video area dividing unit, 201 denotes an area 1 maximum luminance calculating means, 202 denotes an area 1 average luminance calculating means, 203 denotes an area 1 minimum luminance detecting means, 204 denotes an area 2 maximum luminance calculating means, and 205 denotes an area 2 average brightness calculation means, 206 is area 2 minimum brightness calculation means, 207 is area 3 maximum brightness calculation means, 208 is area 3 average brightness calculation means, 209 is area 3 minimum brightness calculation means, 210 is black belt boundary determination means is there.

  FIG. 3 shows the relationship between the decoded main image and the boundary lines and areas for detecting the black belt portion. In FIG. 3, 300 is a boundary line a, 301 is a boundary line b, 302 is a region A sandwiched by the boundary line a300 from the upper end, 303 is a region B sandwiched by the boundary line a301 from the boundary line a300, and 304 is a boundary line Regions C and 305 sandwiched at the lower end from b301 are the luminance calculation boundary line a within region B, and 306 is the luminance calculation boundary line b within region B.

  4 (a), 4 (b), and 4 (c) are flowcharts showing the black belt portion detection procedure and the movement of the boundary line a300. In FIG. 4A, FIG. 4B, and FIG. 4C, reference numerals 401 to 415 denote processing steps and determination steps for moving the black line detection process and the accompanying boundary line a300.

  FIG. 5A, FIG. 5B, and FIG. 5C are flowcharts showing the black belt portion detection procedure and the movement of the boundary line b301. In FIG. 5A, FIG. 5B, and FIG. 5C, reference numerals 501 to 515 denote processing steps and determination steps for moving the black line detection process and the accompanying boundary line a300.

  FIGS. 6A and 6B are flowcharts showing the determination until the black belt portion of the area A to be displayed is changed and the black belt portion detection processing is restarted. In FIG. 6A and FIG. 6B, reference numerals 601 to 611 denote processing steps until the black band portion change determination to be displayed and the black band portion detection process are restarted.

  FIGS. 7A and 7B are flowcharts showing the determination until the black belt portion of the area C to be displayed is changed and the black belt portion detection process is restarted. In FIG. 7A and FIG. 7B, reference numerals 701 to 711 denote processing steps until the black belt portion change determination to be displayed and the black belt portion detection processing are restarted.

  First, an outline of video data decoding processing steps in the video playback apparatus will be described. The separated main video data and sub-video data are respectively decoded by the main video decoding unit 100 and the sub-video decoding unit 106 to generate a main video signal and a sub-video signal, respectively. Thereafter, the video signal adding means 103 at the final stage adds the main video signal and the sub video signal while synchronizing them in time, and outputs it as a video signal for display on a display or the like. Video data is allocated as the main video data, and there are several wide patterns such as “Vista size” and “Cinemascope size” for movie material and the like for the reproduction material image data. On the other hand, sub-picture data is mainly assigned to caption data.

  Here, by adding a horizontal enlargement / reduction means 101 and a vertical enlargement / reduction means 102 between the main video decoding means 100 and the video signal adding means 103, the enlargement / reduction processing of the main video signal can be performed independently of the sub-video signal. It becomes possible. Further, a black band part detecting unit 105 is incorporated to detect a black band part of the main video signal, and the black band part detecting unit includes a video area three-dividing unit 200, a region A maximum luminance calculating unit 201, and a region A average luminance. Calculation means 202, area A minimum brightness calculation means 203, area B maximum brightness calculation means 204, area B average brightness calculation means 205, area B minimum brightness calculation means 206, area C maximum brightness calculation means 207, area C average brightness calculation means 208, a region C minimum luminance calculating unit 209, and a black belt boundary determining unit 210.

  With respect to the main video signal output from the main video decoding unit 100, the black band detection unit 105 detects the main video black band portion as time elapses. The entire screen of the video (field or frame) to be output is taken into the video area dividing means 200. The captured video data is divided into three areas, area A302, area B303, and area C304, in the vertical direction. In area A302, the maximum luminance of area A302 is calculated by area A maximum luminance calculation means 201, and area A average luminance is calculated. The average brightness of the area A302 is calculated by the calculation means 202, the minimum brightness of the area A302 is calculated by the area A minimum brightness calculation means 203, and the maximum brightness of the area B303 is calculated by the area B maximum brightness calculation means 204 in the area B303. The area B average luminance calculating means 205 calculates the average luminance of the area B303, the area B minimum luminance calculating means 206 calculates the minimum luminance of the area B303, and similarly, in the area C304, the area C maximum luminance calculating means 207 calculates the area The maximum luminance of C304 is converted into the average luminance of region C304 by the region C average luminance calculating unit 208 and the region C minimum luminance calculating unit 209. It calculates the minimum luminance of the region C304. Each of the above-described luminance detection means can calculate each luminance value of the entire region, and can also detect each luminance in a specified range in each region.

  Next, the black belt boundary determination process will be described with reference to FIGS.

  Based on the maximum luminance value, average luminance value, and minimum luminance value of each area obtained, the black band boundary determining unit 210 determines a black band boundary line of the main video. First, a threshold value T of luminance for black portions is determined (step 401). The initial position of the boundary line a300 is set as the upper end of the decoded main video (step 402). While the boundary line a300 is shifted downward, the boundary position of the portion where the maximum luminance value, the average luminance value, and the minimum luminance value of the area A302 are equal and smaller than the predetermined threshold value T is detected (step 403, step). 404, step 405). After the detection, a boundary line a300 is set at the boundary position, and it is confirmed that the boundary position does not fluctuate continuously for the period of the video t1 frame (t1 is an arbitrary integer) (step 406, step 407, step 408, step 409, step 410, step 411, step 412). This confirmation processing is performed under the condition that the maximum luminance value, the average luminance value, and the minimum luminance value of the area A302 surrounded by the boundary line a300 set from the upper end of the video are equal and smaller than the threshold value T, and the area B303. The maximum luminance value, the average luminance value, and the minimum luminance value of a region (l is an arbitrary integer) sandwiched between the region B luminance calculation boundary line a305 existing in the lower l line from the boundary line a300 existing in The process is performed under two conditions of the threshold value T or more (step 410). When it is confirmed that the two conditions are satisfied, the region A302 sandwiched by the boundary line a300 from the upper end is determined as the black belt portion. If the two conditions are not satisfied, the boundary line a300 is moved up and down again to continue the black band detection process. If the maximum luminance value, the average luminance value, and the minimum luminance value of the area A302 are not equal or greater than or equal to the threshold value T, the boundary line a300 is moved upward (steps 413 and 415), and the area A302 and the boundary line a300 are moved. Both the area (l is an arbitrary integer) sandwiched by the luminance calculation boundary line a305 in the area B existing in the lower l line from the threshold value T is equal to the maximum luminance value, the average luminance value, and the minimum luminance value. Is smaller, the boundary line a300 is moved downward (steps 413 and 414), and the black belt portion boundary position processing is continued.

  Similarly, the initial position of the boundary line b301 is set as the lower end of the decoded main video (step 502). While the boundary line b301 is shifted upward, the boundary position of the portion where the maximum luminance value, the average luminance value, and the minimum luminance value of the region C304 are equal and smaller than the predetermined threshold value T is detected (step 503, step). 504, step 505). After the detection, a boundary line b301 is set at the boundary position, and it is confirmed that the boundary position does not fluctuate continuously for the period of the video t1 frame (t1 is an arbitrary integer) (step 506, step 507, step 508, step 509, step 510, step 511). This confirmation processing includes a condition that the maximum luminance value, the average luminance value, and the minimum luminance value of the region C304 surrounded by the boundary line b301 set from the lower end of the video are equal and smaller than the threshold value T, The maximum luminance value, the average luminance value, and the minimum luminance value of a region (m is an arbitrary integer) sandwiched by the luminance calculation boundary line b306 in region B existing in the upper m lines from b301 are not equal to or greater than the threshold T (Step 510). When it is confirmed that the two conditions are satisfied, a region C304 sandwiched by the boundary line b301 from the lower end is determined as a black belt portion. If the above two conditions are not satisfied, the boundary b301 is moved up and down again to continue the black band detection process. If the maximum luminance value, the average luminance value, and the minimum luminance value of the region C304 are not equal or equal to or greater than the threshold value T, the boundary line b301 is moved downward (step 513, step 514), and the region C304 and the boundary line b301 are displayed. Both of the regions (m is an arbitrary integer) sandwiched by the luminance calculation boundary line b 306 in the region B existing in the m line below from the threshold value T are equal in maximum luminance value, average luminance value, and minimum luminance value. Is smaller, the boundary line b301 is moved upward (steps 513 and 514), and the black belt portion boundary position processing is continued.

  Next, a process for determining that the black belt boundary has changed after the black belt boundary has been once determined using FIGS. 6 (a), 6 (b), 7 (a), and 7 (b). explain. Once the black belt boundary is determined, the region a302 and the region between the boundary line a300 existing in the region B303 and the region B luminance calculation boundary line a305 existing in the lower l line (l is an arbitrary Integer), a region (m is an arbitrary integer) sandwiched between the region B luminance calculation boundary line b306 existing m lines above the boundary line b301, and the maximum luminance value, average luminance value, and minimum of each region C304 The calculation of the luminance value is continued (Step 601, Step 602, Step 603, Step 604, Step 605, Step 701, Step 702, Step 703, Step 704, Step 705). After the black belt boundary is determined, the maximum luminance value, the average luminance value, and the minimum luminance value of the area A302 or the area C304 are not equal or equal to or greater than the threshold value T for a period of t2 frames (t2 is an arbitrary integer). If the condition is satisfied, the black border boundary determination process is resumed (step 602, step 603, step 604, step 606, step 607, step 608, step 609, step 610, step 611). In this case, if the maximum brightness value, the average brightness value, and the minimum brightness value are not equal or greater than or equal to the threshold value T in the area A302, the boundary C300 is moved upward (step 611), and the area C304 has the maximum brightness value. If the average luminance value and the minimum luminance value are not equal or greater than or equal to the threshold value T, the black line boundary detection process is restarted while moving the boundary line b301 downward (step 610). In FIG. 4A showing a part of the black band detection processing flow, the process of step 402 is skipped when the black band boundary detection process is resumed.

  Further, after the black belt boundary is determined, it is sandwiched between the area A302 and the area B luminance calculation boundary line a305 existing in the lower l line from the boundary line a300 continuously for the period of t3 frame (t3 is an arbitrary integer). The areas (l is an arbitrary integer) both have the same maximum luminance value, average luminance value, and minimum luminance value and are smaller than the threshold value T, or exist in the upper m lines from the area C304 and the boundary line b301. The condition that the maximum brightness value, the average brightness value, and the minimum brightness value are both equal and smaller than the threshold value T is generated in the area (m is an arbitrary integer) sandwiched between the brightness calculation boundary line b 306 in area B In this case, the black band boundary detection process is resumed (step 702, step 703, step 704, step 706, step 707, step 708, step 709, step 710). Step 711). In this case, both the area A302 and the area (l is an arbitrary integer) sandwiched between the area B luminance calculation boundary line a305 existing on the lower l line from the boundary line a300 are the maximum luminance value, the average luminance value, and the minimum When the luminance values are equal and smaller than the threshold value T, the boundary line a300 is moved downward (step 711), and the luminance calculation boundary line b306 in the region B existing in the upper m lines from the boundary line b301. When the maximum luminance value, the average luminance value, and the minimum luminance value are equal and smaller than the threshold value T in both of the regions (m is an arbitrary integer), the boundary line b301 is moved upward (step 710) The black belt boundary detection process is performed again. Note that in FIG. 5A showing a part of the black band detection processing flow, when the black band boundary detection process is resumed, the process of step 502 is skipped.

  After the black band portion determination processing, the enlargement ratio reduction value calculation unit 104 detects the black band portion information of the main video detected by the black band portion detection unit 105, the picture quality information of the main video material, and the display to be displayed. Based on the information of the display area, an enlargement / reduction ratio optimal for eliminating the upper and lower black belt portions is calculated.

  The calculated enlargement / reduction ratio is set in the horizontal enlargement / reduction unit 101 and the vertical enlargement / reduction unit 102. Based on the set values, the horizontal enlargement / reduction process and the vertical enlargement / reduction process of the main video are performed. After that, the video signal adding means 103 adds the sub video and outputs it as a video output signal.

  Conventionally, the display screen zoom has been affected by the subtitle display whose output status frequently changes, but in this way, the main video is scaled independently of the sub video, and then the main video and sub video are added. By doing so, enlargement / reduction is performed only on the display size of the main video, and it is possible to realize an easy-to-view zoom function without affecting the display screen zoom by the caption display. In addition, it is possible to avoid missing subtitles on the display screen due to a delay in zoom processing or the like.

  In addition, regarding the detection of the black belt portion, which is a precondition for calculating the enlargement / reduction ratio, the effect of increasing the detection accuracy is obtained by using three values of the maximum luminance value, the average luminance value, and the minimum luminance value of the detection area. . By continuously processing the black band detection by luminance at every shell frame t of the main video, the enlargement / reduction (zoom) can be automatically changed according to the change of the time axis of the video reproduction material.

  The video playback apparatus according to the present invention reproduces data on broadcast and communication transmissions having a video data structure in which main video and sub-video are played back separately and added at the final output stage by scaling only the main video. It can also be applied to a video playback device that performs the above.

Block configuration diagram of a video playback device in an embodiment of the present invention Block configuration diagram of black belt portion detection means in the embodiment of the present invention Schematic diagram showing the relationship between the main video and the boundary line and region for detecting the black belt portion in the embodiment of the present invention Flow chart of main image and black belt part detection procedure and associated boundary movement in the embodiment of the present invention Flow chart of main image and black belt part detection procedure and associated boundary movement in the embodiment of the present invention Flowchart from the embodiment of the present invention until the black belt portion of the area A to be displayed is changed and the black belt portion detection process is restarted. Flowchart from the embodiment of the present invention until the black band portion of the region B to be displayed is changed and the black band portion detection process is restarted. Schematic diagram showing a conventional method for enlarging and reducing video

Explanation of symbols

100 Main video decoding means 101 Horizontal enlargement / reduction means 102 Vertical enlargement / reduction means 103 Video signal addition means 104 Enlarged value reduction value calculation means 105 Black belt part detection means 106 Sub-picture decoding means 200 Video area tri-section means 201 Area A maximum luminance calculation Means 202 Area A average brightness calculation means 203 Area A minimum brightness calculation means 204 Area B maximum brightness calculation means 205 Area B average brightness calculation means 206 Area B minimum brightness calculation means 207 Area C maximum brightness calculation means 208 Area C average brightness calculation means 209 Area C minimum luminance calculation means 210 Black belt boundary determination means

Claims (10)

In a video playback apparatus that has a main video decoding means and a sub video decoding means and adds and outputs the main video signal output from the main video decoding means and the sub video signal output from the sub video decoding means, the luminance of the main video signal Based on the information on the black belt portion output from the black belt portion detection means for detecting the black belt portion of the main video, the picture quality of the playback material, the display quality of the display and the black belt portion detection means. An enlargement / reduction value calculation means for calculating the enlargement / reduction ratio of the main image, a main image horizontal enlargement / reduction means, and a main image vertical enlargement / reduction means,
Based on the horizontal enlargement / reduction value and the vertical enlargement / reduction value obtained by the enlargement / reduction value calculation means, the horizontal enlargement / reduction means and the vertical enlargement / reduction means prevent the black band portion from being displayed on the display. A video reproducing apparatus configured to adjust enlargement / reduction. The main video to be reproduced is divided into three areas by two boundary lines in the vertical direction, and the maximum luminance value, the average luminance value, and the minimum luminance value of each of the three areas are calculated. The two boundary lines are moved up and down the boundary position of an area where the minimum luminance value is the same and the calculated maximum luminance value, average luminance value, and minimum luminance value are smaller than the luminance value determined to be a black belt portion. A video playback method for detecting a portion other than an area sandwiched between two boundary lines at a detected boundary position as a black belt portion. 3. A video reproducing apparatus according to claim 1, further comprising black band detecting means for detecting a black band portion by the method according to claim 2. 3. The video reproduction method according to claim 2, wherein the initial position of two boundary lines that are moved up and down for detection of black belt portion detection is determined based on picture quality information of the reproduction material. The main video to be reproduced is divided into three areas by two boundary lines in the vertical direction, and the maximum luminance value, the average luminance value, and the minimum luminance value of each of the three areas are calculated. The two boundary lines are moved up and down the boundary position of an area where the minimum luminance value is the same and the calculated maximum luminance value, average luminance value, and minimum luminance value are smaller than the luminance value determined to be a black belt portion. Among the two boundary lines at the detected boundary position, m lines above the boundary line located above and n lines below the boundary line located below (m and n are integers). A video reproduction method for determining a lower portion as a black belt portion. 6. A video reproducing apparatus according to claim 1, further comprising black band detecting means for detecting a black band portion by the method according to claim 5. Once the black belt portion is detected, the luminance K of the upper k line of the boundary line located above the two boundary lines that divide the area, the luminance L of the lower l line, and the lower boundary line The brightness M of the upper m line and the brightness N of the lower n line are calculated, and when the brightness K or the brightness N value is larger than the brightness value determined as the black belt portion, the brightness L 6. The video reproduction method according to claim 2, wherein the black band portion detection is restarted when the value of the luminance M becomes smaller than a luminance value determined to be a black belt portion. Once the black belt portion is detected, the maximum luminance Kmax, the average luminance Kave, the minimum luminance Kmin of the area from the boundary line to the upper end located on the two boundary lines dividing the area, and the upper boundary line Maximum luminance Lmax, average luminance Lave, and minimum luminance Lmin of the area up to the lower l line, and maximum luminance Mmax, average luminance Mave, and minimum luminance Mmin of the area up to m lines above the boundary line located below the two boundary lines Then, the maximum luminance Nmax, the average luminance Nave, and the minimum luminance Nmin from the lower boundary line to the lower end are calculated, and Kmax, Kave, and Kmin are not equal or larger than the luminance value determined as the black belt portion. A case where Nmax, Nave, and Nmin are not equal, or a luminance value that is determined to be a black band portion, and When max, Kave, and Kmin are equal and less than the luminance value determined to be a black band portion, and Lmax, Lave, and Lmin are equal and smaller than the luminance value determined to be a black band portion, Mmax, Mave, and Mmin are equal to the black band portion. 6. The video according to claim 2, wherein black band portion detection is restarted when the luminance value is smaller than a luminance value determined as a portion and Nmax, Nave, and Nmin are equal and smaller than a luminance value determined as a black belt portion. Playback method. 8. A video reproducing apparatus according to claim 1, further comprising black band detecting means for detecting a black band portion by the method according to claim 7. 9. A video reproducing apparatus according to claim 1, further comprising black band detecting means for detecting a black band part by the method according to claim 8.

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