JP5232744B2 - Display device, method and program for displaying summary content - Google Patents

Description

  The present invention relates to a technique for displaying digital broadcast content including video and subtitle character strings. In particular, the present invention relates to a technique for recording content distributed to a terrestrial digital broadcasting service and reproducing the summary content.

  According to the digital terrestrial broadcasting service, subtitle information (closed caption) is simultaneously distributed in addition to video. The caption information is a character string such as a conversation or a dialogue about the video. The broadcast receiving terminal reproduces the video data and audio data in the received broadcast data, and superimposes the caption information data in the broadcast data on the video data being reproduced. The broadcast receiving terminal is not limited to a home television receiver, and may be, for example, a personal computer or a mobile phone terminal. In particular, as a terrestrial digital broadcasting service for mobile phones, there is “1 seg” technology defined by the standard of ARIB (Radio Industry Association). According to this technology, the user can understand the content from the video being reproduced and the caption information that is always displayed without listening to the sound.

  Some broadcast receiving terminals have a function of recording received broadcast data in a storage device such as a hard disk device. By increasing the capacity of the storage device, the viewer can record the broadcast content for a long time and reproduce the broadcast content at any time.

  At this time, the viewer may play back one broadcast content from the beginning to the end, or may play back only a part thereof. In particular, the viewer often desires to view only the outline of the broadcast content in a short time due to time constraints. In this case, the viewer views only the portion of the scene he / she wants to see by normal playback while playing back in fast-forward.

  There is a technique for generating summary content in order for a viewer to understand the outline of the broadcast content in a short time. The summary content includes, for example, one obtained by concatenating partially extracted video data from the original content, and one obtained by generating an animation from a partially extracted still image.

  For example, in order to generate an animation image, there is a technique in which image processing for extracting only the outline is performed on a cut out still image, and an image group obtained by synthesizing them is continuously switched (see, for example, Patent Document 1).

  In addition, there is a technique for switching and displaying the display of a still image cut out from video data together with the display of subtitle character strings included in digital broadcast content (for example, see Patent Document 2).

JP 2007-006308 A JP 2009-076970 A

  According to the technique described in Patent Document 1, a line drawing animation image is generated, so that the viewer cannot feel the original content image. On the other hand, according to the technique described in Patent Document 2, since the still image cut out from the video data is directly used, it is easy to feel the original content image. In addition, according to this technique, since the still image switching timing is determined based on the caption character string, the readability of the caption character string displayed simultaneously with the still image is improved.

  However, in this technique, there is only one set of still images and subtitle character strings displayed during browsing, and these sets are switched and displayed. In this case, the viewer cannot understand a plurality of still images and subtitle character strings in the flow with time. Of course, it is also possible to display a plurality of still images and subtitle character strings before and after the passage of time with a focus on still images and subtitle character strings to be noted.

  However, when moving the display of a still image and a caption character string with the passage of time, if the still image is switched based on the display time based on the caption character string, only fragmental display switching can be performed. That is, the still image cannot be moved smoothly. In this case, when viewed from the viewer, the switching of the fragmentary display is unnatural and causes visual fatigue.

  Therefore, according to the present invention, summary content including a still image and a subtitle character string can be viewed from the viewer, and the readability of the subtitle character string can be improved and the display of the still image can be switched visually and naturally. It is an object to provide a display device, a method, and a program.

According to the present invention, a display device for displaying summary content based on digital broadcast content including video and subtitle character strings,
Subtitle character string extraction means for extracting a subtitle character string unit from digital broadcast content;
Video extraction means for extracting video from digital broadcast content in units of subtitle character strings;
Image extracting means for extracting one still image from video based on a unit of subtitle character string;
Display time determining means for determining the display time of a still image according to the number of characters for each unit of subtitle character string;
The still image is slidably moved in the traveling direction as time passes, and is passed through the display center range designated by the length L in the traveling direction of about one still image in the display area. Display control means for displaying a still image of the temporal future behind the traveling direction of
With respect to the display control means , the moving speed in the traveling direction is a value obtained by dividing the length L of the display center range by the display time of the still image that has entered the display center range from the rear in the traveling direction. And

  According to another embodiment of the display device of the present invention, it is also preferable that the display time determination means determines the display time to be at least a predetermined minimum time when the number of characters is equal to or less than a predetermined number.

According to another embodiment of the display device of the present invention,
When the still image displayed in the display central range of the display area is switched from the first image to the second image, the display control means includes a predetermined end time range in the display time of the first image, The first moving speed based on the display time of the first image is variably controlled from the first moving speed based on the display time of the first image to the second moving speed based on the second display time within a predetermined start time range in the display time of the second image. It is also preferable.

  According to another embodiment of the display device of the present invention, the display control means visually highlights the second still image and the caption character string displayed in the display center range of the display area by highlighting. It is also preferable to display.

  According to another embodiment of the display device of the present invention, the display control means includes the first still image, the subtitle character string, the third still image, and the subtitle character string displayed outside the display center range of the display area. It is also preferable to display the image so as not to be visually noticeable by reducing the contrast.

According to the present invention, there is provided a program for causing a computer mounted on a display device that displays summary content based on digital broadcast content including video and subtitle character strings to function.
Subtitle character string extraction means for extracting a subtitle character string unit from digital broadcast content;
Video extraction means for extracting video from digital broadcast content in units of subtitle character strings;
Image extracting means for extracting one still image from video based on a unit of subtitle character string;
Display time determining means for determining the display time of a still image according to the number of characters for each unit of subtitle character string;
The still image is slidably moved in the traveling direction as time passes, and is passed through the display center range designated by the length L in the traveling direction of about one still image in the display area. Display control means for displaying a still image of the temporal future behind the traveling direction of
For the display control means , the moving speed in the traveling direction is a value obtained by dividing the length L of the display center range by the display time of the still image that has started to enter the display center range from the rear in the traveling direction. > It is characterized by making the computer function as follows.

According to the present invention, there is provided a display method for displaying summary content on a display device based on digital broadcast content including video and subtitle character strings,
A first step of extracting a subtitle character string unit from the digital broadcast content;
A second step of extracting video from digital broadcast content for each unit of subtitle character string;
A third step of extracting one still image from the video based on the unit of the subtitle character string;
A fourth step of determining a display time of a still image according to the number of characters for each subtitle character string unit;
The still image is slidably moved in the traveling direction as time passes, and is passed through the display center range designated by the length L in the traveling direction of about one still image in the display area. And a fifth step of displaying a still image of the temporal future behind the traveling direction of
For the fifth step, the moving speed in the traveling direction is a value obtained by dividing the length L of the display central range by the display time of the still image that has started to enter the display central range from the rear in the traveling direction. It is characterized by that.

  According to the display device, method, and program of the present invention, a summary content including a still image and a subtitle character string is viewed from the viewer, the readability of the subtitle character string is improved, and still image display is visually natural. You can switch to

It is a 1st display image in this invention. It is a 2nd display image in this invention. It is a functional block diagram of the display apparatus in this invention. It is explanatory drawing showing the correspondence of a still image and a caption character string. It is a display image in the 1st time and the 2nd time. It is a display image in 3rd time and 4th time. It is a display image in 5th time and 6th time. It is a display image in 7th time and 8th time.

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

  FIG. 1 is a first display image in the present invention.

  The display device 1 receives digital broadcast data through an antenna or a communication interface. The display device 1 includes a display for a user, and may be a personal computer, a mobile phone, or a mobile terminal. Digital broadcast data includes terrestrial / satellite digital broadcast via broadcast waves, IP broadcast via the Internet, and the like. The digital broadcast data includes video data, audio data, and caption information data.

  The display device 1 according to the present invention generates summary content from the received digital broadcast data, and displays the summary content on a display. The summary content in the present invention is content obtained by extracting one still image for each unit of subtitle character string from the original broadcast content. According to the present invention, when a still image is displayed on a display, a subtitle character string corresponding to that portion is also displayed simultaneously.

  A browser screen is displayed on the display of the display device 1. In the browser screen, still images and subtitle character strings are arranged in the first direction, and the still images are displayed slidably moved in the second direction as time progresses.

  According to FIG. 1, a still image and a subtitle character string are arranged in the vertical direction (first direction), and the still image is slidably displayed in the left-right direction (second direction) as time progresses. (Smooth scroll). The plurality of still images flow and move from right to left as time progresses. The subtitle character string also moves from right to left along the flow of the image.

  According to FIG. 1, the image and subtitle character string that should be noticed by the viewer are displayed near the center of the browser screen and displayed with a highlight frame. This makes it easier for the viewer to recognize the image and subtitle character string to be noted.

  The subtitle character string corresponding to the still image to be noticed may be displayed at the center and jumped to move. Also. It may be one that moves smoothly in parallel with a still image.

  The moving speed of the still image is also preferably displayed on the browser screen so that it can be confirmed by the viewer.

  FIG. 2 is a second display image in the present invention.

  According to FIG. 2, the still image and the subtitle character string are arranged in the left-right direction (first direction), and the still image moves slidably in the up-down direction (second direction) as time progresses. Is displayed. A subtitle character string corresponding to the image is displayed on the right side of one still image. In addition, the plurality of still images flow and move from the bottom to the top as time progresses. The subtitle character string also moves from bottom to top along the flow of the image. Of course, the still image and the subtitle character string may move in the direction from top to bottom.

  FIG. 3 is a functional configuration diagram of the display device according to the present invention.

  According to FIG. 3, the display device 1 includes a broadcast receiving unit 101, a demodulating unit 102, a video decoding unit 103, a caption information decoding unit 104, an audio decoding unit 105, a recording management unit 106, and a content storage unit. 107.

  The broadcast receiving unit 101 receives a digital broadcast signal through an antenna or a communication interface, and outputs a broadcast signal of one channel to the demodulation unit 102. Channel selection is based on viewer selection. The demodulator 102 demodulates the broadcast signal. The video data is output to the video decoding unit 103, the caption information data is output to the caption information decoding unit 104, and the audio data is output to the audio decoding unit 105. The video decoding unit 103 decodes video data, the subtitle information decoding unit 104 decodes subtitle information data, and the audio decoding unit 105 decodes audio data. The decoded video data, caption information data, and audio data are output to the recording management unit 106. The recording management unit 106 stores the video data, caption information data, and audio data as one content in the content storage unit 107. The content storage unit 107 is a large-capacity recording device such as a hard disk device.

  The functional components 101 to 106 described above are not essential components in the present invention. According to the present invention, the content storage unit 107 needs to store at least one broadcast content including video data and caption information data in order to generate summary content.

  Further, according to FIG. 3, the display device 1 includes a subtitle character string extraction unit 111, a video extraction unit 112, an image extraction unit 113, a display time determination unit 114, a summary content storage unit 115, and a display control unit. 121 and a display unit 122. These functional components other than the display 121 are realized by executing a program that causes a computer mounted on the display device to function. In addition, the functional configuration unit described below is represented in time series as a display method in a display device that displays summary content.

  FIG. 4 is an explanatory diagram showing the correspondence between still images and subtitle character strings. In the following, FIG. 4 is described in conjunction with FIG.

  The subtitle character string extraction unit 111 acquires one broadcast content from the content storage unit 107 and extracts a unit of the subtitle character string. FIG. 4B shows a unit of a caption character string. The subtitle character string may be detected by video data having a short interval of about 2 seconds, or may be detected by video data having a long interval of 10 seconds or more.

  The video extraction unit 112 acquires one broadcast content from the content storage unit 107 and inputs the detection timing of the subtitle character string from the subtitle character string extraction unit 111. FIG. 4A shows a frame of video data. The video extraction unit 112 detects the relationship shown in FIGS. 4 (a) and 4 (b).

According to FIG. 4, the subtitle character string C ₁ is detected when the frame F ₁ is reproduced, and then the subtitle character string C ₂ is detected when the frame F ₇ is reproduced. In this case, a plurality of frames F _{1 to} F ₆ are associated with one caption character string C ₁ . To the viewer, the display, during playback of a plurality of frames F ₁ to F _6, and displays the superimposed subtitle string C _1. According to FIG. 4, the following likewise, the display, during the playback of a plurality of frames F ₇ to F _13, and displays the superimposed subtitle string C _2.

  The image extraction unit 113 extracts one image from a frame of video data based on a subtitle character string unit. In general, a subtitle character string is displayed at a timing slightly earlier than the progress of a video. However, in live broadcast programs, subtitle character strings may be displayed later than video. For this reason, the progress of the video and the progress of the subtitle character string do not necessarily match. In order to extract a still image as appropriate as possible for the subtitle character string, the middle image is selected according to FIG. 4C. Of course, for example, the first image may be selected or may be selected at random.

The display time determination unit 114 determines the display time of the corresponding still image according to the number of characters for each subtitle character string unit. According to the present invention, the display time is represented by the following equation.
Display time (seconds) = number of subtitle characters x S + B
S: Display time per character (for example, 0.1 seconds per character)
B: Minimum display time (minimum time to be displayed even when the number of subtitle characters is 0: 2 seconds, for example)
The minimum display time B prevents visual discomfort caused by the display time being too short when viewed from the viewer.

  The display control unit 121 arranges the still image and the caption character string in the first direction, and slides and displays the still image in the second direction as time progresses (smooth scrolling). The display control unit 121 displays at least three or more still images and subtitle character strings while sliding in the second direction as time progresses. The second still image and the caption character string are displayed in the display center range of the display area, the first still image and the caption character string in the past in time are displayed in front of the display center range, and behind the display center range. The third still image and subtitle character string of the temporal future are displayed. Here, the second still image and the caption character string displayed in the display center range of the display area mean “focus image” and “focus caption”.

  The display control unit 121 visually highlights and displays the focus image and the focus subtitle displayed in the display center range of the display area. For example, it is also preferable to display a conspicuous frame color (for example, orange).

  Conversely, the display control unit 121 visually reduces the first still image, subtitle character string, and third still image and subtitle character string displayed outside the display center range of the display area by reducing the contrast. You may display so that it may not stand out. For example, it is also preferable to display the first still image and subtitle character string and the third still image and subtitle character string with “contrast: −40%” and “blur: 2.5 points”. In the subtitle character string, it is also preferable to display characters in a light color.

  The display control unit 121 variably controls the moving speed in the second direction so that each still image is displayed within the display center range L of the display area for the display time. The moving speed in the second direction is determined by dividing by the display time from the distance in the display center range of the display area.

  5 to 8 show display images over time, and a still image column and a subtitle character string column are displayed side by side. A plurality of images flow and move from right to left as time progresses. The subtitle character string also moves from right to left along the flow of the image.

The display area is represented a display center range L around the center x ₀ of the display area. The focus image moves in the display center range L during the display time.
Display center range L: x ₀ + L / 2 <-x _0- > x ₀ -L / 2

  The display center range L is represented by the number of pixels. Since the screen size is fixed, the number of pixels D is a fixed value programmatically. When the screen resolution is 1820 × 1080, D = 360 (pixels) is appropriate. On the other hand, for example, when the JPEG size is 240 × 180 at the maximum, the focus image is preferably enlarged to 1.4 times the size 336 × 252.

The moving speed of the display center range L is expressed by the following equation.
Movement speed (pixel / second) = display center range D (pixel) / display time (second)

  In addition, when the image displayed in the display center range of the display area is switched from the first image to the second image, the end predetermined time range in the display time of the first image, and the second image The first moving speed based on the display time of the first image is variably controlled from the first moving speed based on the display time of the first image within a predetermined start time range in the display time.

Furthermore, it is preferable that the display time is expressed by the following equation depending on the desired setting of the viewer.
Display time (seconds) = F. (Number of subtitle characters x S + B)
F: Acceleration / deceleration constant (for example, 0.5 to 1.5)
The acceleration / deceleration constant F is set to 1 or less, for example, when the viewer wants to browse summary content at high speed. Conversely, when the viewer wants to browse the summary content slowly, it is set to 1 or more.

  FIG. 5 is a display image at the first time and the second time.

According to a first time t _1, the still image F ₃ is displayed on the display center range L. The display time of the still image F ₃ is determined as T ₁ = 3 seconds based on the number of subtitle characters. At this time, the moving speed at which the sequence of still images moves from right to left is controlled by the following equation.
Movement speed (pixels / second) = number of pixels in the display center range D / display time T ₁
In this case, the subtitle character string corresponding to the still image F ₃ are also displayed in the display center range L.

When the number of pixels D in the display center range is 360 pixels, the moving speed is as follows.
Movement speed = D / T ₁
= 360 pixels / 3 seconds
= 120 pixels / second

According to the second time t _2, it is assumed that the sequence of still images has moved and the still image F ₃ has reached a predetermined end time range to be displayed in the display center range L (for example, the end 10% of the display time). .
End predetermined time range = display time T ₁ × predetermined ratio (10%)
= 3 seconds x 10%
= 0.3 seconds

For the end predetermined time range of 0.3 seconds, the moving speed is variably controlled as follows.
Movement speed = D / T _1- > (D / T ₁ + D / T ₂ ) / 2
Column of the still image, the moving speed with respect to the display time of the still image F _3, the moving speed with respect to the display time of the still image F _11, are decelerated. When the center of the still image F ₃ coincides with the outer boundary of the display center range L, the moving speed becomes (D / T ₁ + D / T ₂ ) / 2. In the end the predetermined time range, subtitle character string corresponding to the still image F ₃ is displayed on the display center range L.

According to FIG. 5, the display time of the still image F ₃ is T ₁ = 3 seconds, and the display time of the still image F ₁₁ is T ₂ = 4 seconds. At this time, the moving speed is decelerated as follows.
Movement speed = D / T _1- > (D / T ₁ + D / T ₂ ) / 2
= 120-> (360/3 + 360/4) / 2
= 120 pixels / second-> 105 pixels / second

  FIG. 6 shows display images at the third time and the fourth time.

According to a third time _{t 3,} the center _{x 0} of the center _{x 0,} and the still image _{F 11} in the still image _{F 3} matches the outer boundary of the display central region L. At this time, the moving speed at which the sequence of still images moves from the right to the left is controlled by the following equation.
Movement speed = (D / T ₁ + D / T ₂ ) / 2
= 105 pixels / sec at this time, still, subtitle character string corresponding to the still image F ₃ is displayed in the display center range L.

According to a fourth time t _4, the column of the still image is moved, the still image F ₁₁ is, and reaches the display center range L start a predetermined time range to be displayed (for example, 10% beginning at display time) .
End predetermined time range = display time T ₂ × predetermined ratio (10%)
= 4 x 10%
= 0.4 seconds

At this time, the moving speed of the sequence of still images is variably controlled as follows for a predetermined start time range of 0.4 seconds.
Movement speed = (D / T ₁ + D / T ₂ ) / 2-> D / T ₂
Column of the still image, the moving speed with respect to the display time of the still image F _3, the moving speed with respect to the display time of the still image F _11, are decelerated. In the end the predetermined time range, subtitle character string corresponding to the still image F ₃ is displayed on the display center range L.

According to FIG. 5, the display time of the still image F ₃ is T ₁ = 3 seconds, and the display time of the still image F ₁₁ is T ₂ = 4 seconds. At this time, the moving speed is decelerated as follows.
Movement speed = (D / T ₁ + D / T ₂ ) / 2-> D / T ₂
= (360/3 + 360/4) / 2-> 90
= 105 pixels / second-> 90 pixels / second

  FIG. 7 is a display image at the fifth time and the sixth time.

According to the time t ₅ of the fifth, still image F ₁₁ is displayed in the display center range L. At this time, the moving speed is as follows.
Movement speed = D / T ₂
= 360 pixels / 4 seconds
= 90 pixels / sec at this time, subtitle character string corresponding to the still image F ₃ are also displayed in the display center range L.

According to the time t ₆ of the sixth, still image F ₁₁ is, and reaches the end a predetermined time range (for example 10% at the end of the display time).
End predetermined time range = display time T ₂ × predetermined ratio (10%)
= 4 seconds x 10%
= 0.4 seconds

For the end predetermined time range of 0.4 seconds, the moving speed is accelerated as follows.
Movement speed = D / T _2- > (D / T ₂ + D / T ₃ ) / 2
= 90-> (360/4 + 360/3) / 2
= 90 pixels / second-> 105 pixels / second

  FIG. 8 shows display images at the seventh time and the eighth time.

According to the time _{t 7} of the seventh, the center _{x 0} of the center _{x 0,} and the still image _{F 18} in the still image _{F 11} matches the outer boundary of the display central region L. At this time, the moving speed is controlled by the following equation.
Movement speed = (D / T ₁ + D / T ₂ ) / 2
= 105 pixels / sec at this time, still, subtitle character string corresponding to the still image F ₁₁ is displayed in the display center range L.

According to the time t ₈ the eighth row of the still image is moved, the still image F ₁₈ is, and reaches the display center range L start a predetermined time range to be displayed (for example, 10% beginning at display time) .
End predetermined time range = display time T ₃ × predetermined ratio (10%)
= 3 x 10%
= 0.3 seconds

At this time, the movement speed of the sequence of still images is accelerated as follows for a predetermined start time range of 0.3 seconds.
Movement speed = (D / T ₂ + D / T ₃ ) / 2-> D / T ₃
= (360/4 + 360/2) / 2-> 120
= 105 pixels / second-> 120 pixels / second

  5 to 8, the moving speed in the second direction is variably controlled so that each still image is displayed in the display center range of the display area for the display time.

  As described above in detail, according to the display device, method, and program of the present invention, the summary content including the still image and the caption character string is viewed from the viewer, and the readability of the caption character string is improved. Still image display can be switched visually and naturally.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Display apparatus 101 Broadcast receiving part 102 Demodulating part 103 Video decoding part 104 Subtitle information decoding part 105 Audio | voice decoding part 106 Recording management part 107 Content storage part 111 Subtitle character string extraction part 112 Video extraction part 113 Image extraction part 114 Display time determination part 115 summary content storage unit 121 display control unit 122 display unit

Claims (7)

A display device for displaying summary content based on digital broadcast content including video and subtitle character strings,
Subtitle character string extraction means for extracting a unit of the subtitle character string from the digital broadcast content;
Video extraction means for extracting the video for each unit of the subtitle character string from the digital broadcast content;
Image extracting means for extracting one still image from the video based on the unit of the subtitle character string;
Display time determining means for determining the display time of the still image according to the number of characters for each unit of the subtitle character string;
The still image is slidably moved in the advancing direction as time passes, and the display area is passed through the display center range designated by the length L in the advancing direction of about one still image. Display control means for displaying a still image of the temporal future behind the direction of travel of the central range ,
For the display control means , the moving speed in the traveling direction is a value obtained by dividing the length L of the display central range by the display time of the still image that has started to enter the display central range from the rear in the traveling direction. A display device characterized by: The display device according to claim 1 , wherein the display time determining unit determines the display time to be at least a predetermined minimum time when the number of characters is equal to or less than a predetermined number. When the still image displayed in the display center range of the display area is switched from the first image to the second image, the display control means is configured to determine a predetermined end time range within the display time of the first image. The first movement speed based on the display time of the first image is changed from the first movement speed based on the display time of the first image to the second movement speed based on the second display time within a predetermined start time range in the display time of the second image. The display device according to claim 1, wherein the display device is a display device. Wherein the display control unit, 3 a second still image and the subtitle text displayed on the display central area of the display area, from claim 1, wherein the displaying visually emphasized by highlighting A display device that displays the summary content according to any one of the above. The display control means is visually inconspicuous by reducing the contrast of the first still image and subtitle character string and the third still image and subtitle character string displayed outside the display center range of the display area. Viewing apparatus according to any one of claims 1 to 3, characterized in that the display as. A program for causing a computer mounted on a display device that displays summary content based on digital broadcast content including video and subtitle character strings to function.
Subtitle character string extraction means for extracting a unit of the subtitle character string from the digital broadcast content;
Video extraction means for extracting the video for each unit of the subtitle character string from the digital broadcast content;
Image extracting means for extracting one still image from the video based on the unit of the subtitle character string;
Display time determining means for determining the display time of the still image according to the number of characters for each unit of the subtitle character string;
The still image is slidably moved in the advancing direction as time passes, and the display area is passed through the display center range designated by the length L in the advancing direction of about one still image. Display control means for displaying a still image of the temporal future behind the direction of travel of the central range ,
For the display control means , the moving speed in the traveling direction is a value obtained by dividing the length L of the display central range by the display time of the still image that has started to enter the display central range from the rear in the traveling direction. A display program for causing a computer to function as described above. A display method for displaying summary content on a display device based on digital broadcast content including video and subtitle character strings,
A first step of extracting a unit of the subtitle character string from the digital broadcast content;
A second step of extracting the video from the digital broadcast content for each unit of the subtitle character string;
A third step of extracting one still image from the video based on the unit of the subtitle character string;
A fourth step of determining a display time of the still image according to the number of characters for each unit of the subtitle character string;
The still image is slidably moved in the advancing direction as time passes, and the display area is passed through the display center range designated by the length L in the advancing direction of about one still image. A fifth step of displaying a still-time future image behind the direction of travel of the central range ;
Regarding the fifth step, the moving speed in the traveling direction is a value obtained by dividing the length L of the display central range by the display time of the still image that has started to enter the display central range from the rear in the traveling direction. A display method characterized by:

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