CN102724458A - Video picture full-screen display subtitle processing method and video terminal - Google Patents
Video picture full-screen display subtitle processing method and video terminal Download PDFInfo
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- CN102724458A CN102724458A CN2012102005640A CN201210200564A CN102724458A CN 102724458 A CN102724458 A CN 102724458A CN 2012102005640 A CN2012102005640 A CN 2012102005640A CN 201210200564 A CN201210200564 A CN 201210200564A CN 102724458 A CN102724458 A CN 102724458A
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Abstract
The invention discloses a video picture full-screen display subtitle processing method and a video terminal. The method includes: acquiring information of a subtitle region on a video terminal screen, wherein the information includes position coordinates and dimension of the subtitle region; reading pixels of the subtitle region in an image cache region of the video terminal according to the position coordinates and the dimension of the subtitle region; acquiring a ground color region of the subtitle region according to a RGB (red, green, blue) value of the pixels of the subtitle region, and hollowing the ground color region; and amplifying the hollowed subtitle region according to the proportion required by image full-screen amplification, and displaying by filling subtitles into the amplified subtitle region. According to the method and the video terminal, the subtitle region is obtained, the ground color region of the subtitle region is subjected to transparency, and the processed subtitle region is amplified according to the proportion required by image full-screen amplification and displayed at the bottom of the screen, so that the subtitles and the images are amplified to the full screen in the same proportion, and the problem of subtitle loss is prevented.
Description
Technical field
The present invention relates to the image display technology field, relate in particular to a kind of captions processing method and video terminal of video pictures full screen display.
Background technology
Generally, when television set during with the wide screen movie program of normal ratio, image have black surround up and down, the black surround that is positioned at below the image generally is used to show captions.
Along with the appearance of large scale TV (such as large-screen LCD TV), variation has also taken place in the wide high proportion of video screen, such as having become 16:9 by 4:3 in the past; And this moment is during with normal ratio movie program; Will also occur the not zone of display image in the left and right sides of image, as shown in Figure 1, the centre of video screen is an image display area 3; Image display area 3 be dark border 2 up and down, be usually located at following dark border 2 for showing the caption area of captions; The left and right sides of image display area 3 is the zone 1 of not display image.
At present, in order to make full use of the LCD video screen, occurred various image being amplified to full frame technology.Wherein a kind of full frame amplifying technique is the television image equal proportion to be amplified to full frame, and after its defective was that image amplifies, captions can be lost, and were as shown in Figure 2; Another kind of full frame amplifying technique is to keep captions not disappear carrying out image frame amplifying, and its defective is that image can't realize that equal proportion amplifies, and can produce distortion.
Summary of the invention
Main purpose of the present invention is to provide a kind of captions processing method and video terminal of video pictures full screen display, is intended to realize that image and captions equal proportion are amplified to full frame and can lose captions.
In order to achieve the above object, the present invention proposes a kind of captions processing method of video pictures full screen display, comprising:
S1, obtain the information of caption area on the video terminal screen, wherein said information comprises the position coordinates and the size of said caption area;
S2, according to the position coordinates and the size of said caption area, from the image buffer storage district of said video terminal, read the pixel of said caption area;
S3, according to the rgb value of the pixel of said caption area, obtain the undercolor region of said caption area, said undercolor region is carried out hollow out;
S4, the caption area of hollow out is amplified according to the required ratio of the full frame amplification of image, and the caption area that captions are filled to after the amplification shows.
Preferably, said step S2 specifically comprises:
S21, according to the position coordinates of said caption area, in the image buffer storage district of said video terminal, find said caption area position;
S22, according to the size of said caption area, lock said caption area, with predetermined frequencies read said caption area pixel and the storage.
Preferably, said step S3 specifically comprises:
S31, the rgb value and the preset RGB reference value of the pixel of the caption area that is read compared;
S32, the pixel that will be lower than the caption area of said RGB reference value are judged to be the background color pixel, obtain undercolor region, and wherein undercolor region is background color pixel region;
S33, the transparency of said undercolor region is made as 100% carries out hollow out, obtain the caption area after the undercolor region hollow out.
Preferably, said RGB reference value is 128.
Preferably, the width of said video terminal screen is 16:9 with the ratio of height; According to the required ratio of the full frame amplification of image is 4:3; Said caption area is shown enlarged in the lowermost end of the image after the full frame amplification.
The present invention also proposes the video terminal that a kind of video pictures full screen display carrying out captions are handled, and comprising:
Acquisition module is used to obtain the information of caption area on the video terminal screen, and wherein said information comprises the position coordinates and the size of said caption area;
Read module is used for position coordinates and size according to said caption area, from the image buffer storage district of said video terminal, reads the pixel of said caption area;
The hollow out module is used for the rgb value according to the pixel of said caption area, obtains the undercolor region of said caption area, and said undercolor region is carried out hollow out;
Display module is used for the caption area of hollow out is amplified according to the required ratio of the full frame amplification of image, and the caption area that captions are filled to after the amplification shows.
Preferably, said read module also is used for the position coordinates according to said caption area, in the image buffer storage district of said video terminal, finds said caption area position; According to the size of said caption area, lock said caption area, read the pixel and the storage of said caption area with predetermined frequencies.
Preferably, the rgb value of the pixel of the said hollow out module caption area that also is used for said read module is read compares with preset RGB reference value; The pixel that will be lower than the caption area of said RGB reference value is judged to be the background color pixel, obtains undercolor region, and wherein undercolor region is background color pixel region; The transparency of said undercolor region is made as 100% carries out hollow out, obtain the caption area after the undercolor region hollow out.
Preferably, said RGB reference value is 128.
Preferably, the width of said video terminal screen is 16:9 with the ratio of height; According to the required ratio of the full frame amplification of image is 4:3; Said caption area is shown enlarged in the lowermost end of the image after the full frame amplification.
The captions processing method and the video terminal of a kind of video pictures full screen display that the present invention proposes; Through obtaining caption area; Undercolor region to caption area is carried out transparent processing; With the caption area of handling according to amplifying and be shown to the lowermost end of screen with the required ratio of the full frame amplification of image, thereby it is full frame to have realized that captions and image are amplified to same ratio, the while has prevented the problem that captions are lost again.
Description of drawings
Fig. 1 is a sketch map of playing the widescreen film on the 16:9 wide-screen television according to the original scale of image;
Fig. 2 is the sketch map that captions are lost during with the full frame enlarged and displayed of image in the prior art;
Fig. 3 is the schematic flow sheet of the captions processing method preferred embodiment of video pictures full screen display of the present invention;
Fig. 4 be among the present invention during with the full frame enlarged and displayed of image captions do not have the sketch map of losing;
Fig. 5 be in the captions processing method preferred embodiment of video pictures of the present invention full screen display according to the position coordinates and the size of said caption area, from the image buffer storage district of said video terminal, read the schematic flow sheet of the pixel of said caption area;
Fig. 6 be in the captions processing method preferred embodiment of video pictures of the present invention full screen display according to the rgb value of the pixel of said caption area, obtain the undercolor region of said caption area, said undercolor region is carried out the schematic flow sheet of hollow out;
Fig. 7 is the structural representation of the video terminal preferred embodiment of video pictures full screen display carrying out captions of the present invention processing.
In order to make technical scheme of the present invention clearer, clear, will combine accompanying drawing to do further to detail below.
Embodiment
The solution of the embodiment of the invention mainly is: the non-legible part to the caption area under the image-region is carried out transparent processing; After amplifying according to the full-screen image equal proportion, the caption area that transparent processing is crossed is shown to the lowermost end of screen; The caption area that simultaneously captions is filled to after the amplification shows, prevents that to realize the indeformable equal proportion of image is amplified to captions from losing full frame the time.
Video terminal can have the display device of video playback capability for television set, computer etc. among the present invention, and following examples all illustrate with the 16:9 wide-screen television, but is not limited to this kind situation.
As shown in Figure 3, preferred embodiment of the present invention proposes a kind of captions processing method of video pictures full screen display, comprising:
Step S1 obtains the information of caption area on the video terminal screen, and wherein said information comprises the position coordinates and the size of said caption area, and said in addition information also can comprise the information that other are relevant with said caption area, this is not limited here;
In the present embodiment, be example with the 16:9 wide screen television, captions show outside image in the setting wide screen television screen.Before the full frame enlarged and displayed of tv screen image, at first obtain the size of the position coordinates and the caption area of caption area on the video screen, in the present embodiment; Said caption area is preferably rectangular shape; Said size can be specially the width and the height of caption area, and in addition, said caption area can be other shapes; For example triangle does not limit this here.
Particularly, according to the aspect ratio standard of 16:9, the black surround up and down of video screen respectively accounts for 1/8 height; Television image is provided with between two parties, and the height of television image is 3/4 of a video screen height, therefore; Caption area is in the centered beneath setting of television image, i.e. the following black surround place of video screen, and its width is consistent with the television image width; Highly be video screen height 1/8, can draw position coordinates, width and the height of caption area thus.Zone 2 within the frame of broken lines of the below that is positioned at image display area 3 that caption area is as shown in fig. 1.
Step S2 according to the position coordinates and the size of said caption area, reads the pixel of said caption area from the image buffer storage district of said video terminal;
In the present embodiment, position coordinates and width and height with the caption area that obtains read caption area from the image buffer storage district of television set.
Particularly; The position coordinates of the caption area that calculates according to step S1; From the image buffer storage district of television set, find said caption area position, and, lock said caption area according to the size of said caption area; Read the pixel of caption area, and store in the internal memory of television set.Do not influence user's visual effect for the synchronous demonstration that guarantees captions and television image, when reading the pixel of caption area, need consider the frequency that reads.
In the present embodiment, as shown in Figure 5, above-mentioned steps S2 specifically comprises:
S21, according to the position coordinates of said caption area, in the image buffer storage district of said video terminal, find said caption area position;
S22, according to the size of said caption area, lock said caption area, with predetermined frequencies read said caption area pixel and the storage.
Understand for ease, illustrate the detailed process of the pixel that reads said caption area below:
Usually; The standard of TV signal comprises PAL (Phase Alternating Line; Line-by-line inversion) standard, NTSC (National Television System Committee; National Television System Committee) standard and SECAM (Sequentiel Couleur A Memoire transmits colored and storage in order) standard, wherein the frame per second of every kind of standard is different.
When reading the pixel of caption area, reading according to the frame per second of TV signal can be so that the processing of captions and picture signal be synchronous fully.But; The captions reading frequency need be not synchronous fully with television image; Suitably reduce the speed that reads the captions pixel, but the captions display frequency remains unchanged, after reading new captions, replace original captions at every turn again; Can neither influence the user and watch effect, can also save CPU and memory source simultaneously.TV signal with 60HZ is an example, can set the frequency that reads captions and reduce to 10 times/second, and only be the sixth of picture frequency.Therefore but captions display frequency or 60HZ can not produce the problem of film flicker.In such cases, the time-delay of caption area and real image is no more than 0.1s at most, and this time-delay be in human eye can't identified range, therefore, can not influence user's vision viewing effect.
Step S3 according to the rgb value of the pixel of said caption area, obtains the undercolor region of said caption area, and said undercolor region is carried out hollow out;
Wherein, the undercolor region of caption area is meant the non-legible zone in the caption area.Hollow out promptly refers to remove the background color of undercolor region in the caption area.
In the present embodiment, as shown in Figure 6, above-mentioned steps S3 specifically comprises:
S31, the rgb value and the preset RGB reference value of the pixel of the caption area that is read compared;
S32, the pixel that will be lower than the caption area of said RGB reference value are judged to be the background color pixel, obtain undercolor region, and wherein undercolor region is background color pixel region;
S33, the transparency of said undercolor region is made as 100% carries out hollow out, obtain the caption area after the undercolor region hollow out.
For the ease of understanding, specify the detailed process of said step S3 below for example:
Usually captions are white, belong to high bright parts, and the background color outside the captions are black or grey, belong to non-high bright parts, and both distinguish with parameters R GB value difference.
Because pure white RGB coordinate figure is (255,255,255), the RGB coordinate figure of black is (0,0,0), and in order to distinguish captions and background color, present embodiment adopts RGB median (128,128,128) to come differentiation judged in captions and background color.If the rgb value of certain pixel all is lower than 128 in the caption area, then this pixel is judged to be the background color pixel, and this background color pixel region is undercolor region, otherwise then is text pixel.The transparency of all undercolor region is made as 100%, promptly the undercolor region (non-legible part) of caption area is carried out hollow out, thereby can obtain removing the caption area of background color.
Step S4 amplifies according to the required ratio of the full frame amplification of image the caption area after the hollow out, and the caption area that captions are filled to after the amplification shows.
Full-screen image is meant that television image reaches the image of full screen display through the equal proportion amplification in the present embodiment.For the widescreen mute of 16:9, the required ratio of the full frame amplification of image is 4:3, and the required ratio of the full frame amplification of the magnification ratio of caption area and image is consistent, and is 4:3.
Therefore; After caption area behind the removal background color is multiplied by the magnification ratio coefficient according to original caption area size; Captions viewing area after can obtaining amplifying; Be the width of original caption area and be multiplied by proportionality coefficient highly respectively after width and height after obtaining amplifying, and the width after the said amplification and highly be the captions viewing area after the said amplification.The captions viewing area is shown enlarged in the lowermost end of the image after the full frame amplification.Then, the captions that read are filled into the captions viewing area after the amplification, have promptly realized the stack of captions on television image, the caption area that has captions of enlarged and displayed is as shown in Figure 4 in proportion with full-screen image.
Present embodiment is through obtaining caption area; Undercolor region to caption area is carried out transparent processing; With the caption area of handling according to amplifying and be shown to the lowermost end of screen with the required ratio of the full frame amplification of image; Thereby it is full frame to have realized that captions and image are amplified to same ratio, has prevented the problem that captions are lost simultaneously again.
As shown in Figure 7, preferred embodiment of the present invention proposes the video terminal that a kind of video pictures full screen display carrying out captions are handled, and comprising: acquisition module 401, read module 402, hollow out module 403 and display module 404, wherein:
Read module 402 is used for position coordinates and size according to said caption area, from the image buffer storage district of said video terminal, reads the pixel of said caption area;
Hollow out module 403 is used for the rgb value according to the pixel of said caption area, obtains the undercolor region of said caption area, and said undercolor region is carried out hollow out;
In the present embodiment, be example with the 16:9 wide screen television, captions show outside image in the setting wide screen television screen.Before the full frame enlarged and displayed of tv screen image, at first obtain the size of the position coordinates and the caption area of caption area on the video screen, in the present embodiment; Said caption area is preferably rectangular shape; Said size can be specially the width and the height of caption area, and in addition, said caption area can be other shapes; For example triangle does not limit this here.
Particularly, according to the aspect ratio standard of 16:9, the black surround up and down of video screen respectively accounts for 1/8 height; Television image is provided with between two parties, and the height of television image is 3/4 of a video screen height, therefore; Caption area is in the centered beneath setting of television image, i.e. the following black surround place of video screen, and its width is consistent with the television image width; Highly be video screen height 1/8, can draw position coordinates, width and the height of caption area thus.Zone 2 within the frame of broken lines of the below that is positioned at image display area 3 that caption area is as shown in fig. 1.
Read module 402 reads caption area with the position coordinates and the size of the caption area that obtains from the image buffer storage district of television set.
Particularly; The position coordinates and the size of the caption area that read module 402 calculates according to acquisition module 401; From the image buffer storage district of television set, find said caption area position, and, lock said caption area according to the size of said caption area; Read the pixel of caption area, and store in the internal memory of television set.Do not influence user's visual effect for the synchronous demonstration that guarantees captions and television image, when reading the pixel of caption area, need consider the frequency that reads.
Usually, the standard of TV signal comprises pal mode, TSC-system formula and Sequential Color and Memory system formula, and wherein the frame per second of every kind of standard is different.
When reading the pixel of caption area, reading according to the frame per second of TV signal can be so that the processing of captions and picture signal be synchronous fully.But; The captions reading frequency need be not synchronous fully with television image; Suitably reduce the speed that reads the captions pixel, but the captions display frequency remains unchanged, after reading new captions, replace original captions at every turn again; Can neither influence the user and watch effect, can also save CPU and memory source simultaneously.TV signal with 60HZ is an example, can set the frequency that reads captions and reduce to 10 times/second, and only be the sixth of picture frequency.Therefore but captions display frequency or 60HZ can not produce the problem of film flicker.In such cases, the time-delay of caption area and real image is no more than 0.1s at most, and this time-delay be in human eye can't identified range, therefore, can not influence user's vision viewing effect.
By the rgb value of hollow out module 403, obtain the undercolor region of said caption area then, said undercolor region is carried out hollow out according to the pixel of said caption area.Wherein, the undercolor region of caption area is meant the non-legible zone in the caption area.Hollow out promptly refers to remove the background color of undercolor region in the caption area.
For the ease of understanding, specify the course of work of said hollow out module 403 below for example:
Usually captions are white, belong to high bright parts, and the background color outside the captions are black or grey, belong to non-high bright parts, and both distinguish with parameters R GB value difference.
Because pure white RGB coordinate figure is (255,255,255), the RGB coordinate figure of black is (0,0,0), and in order to distinguish captions and background color, present embodiment adopts RGB median (128,128,128) to come differentiation judged in captions and background color.If the rgb value of certain pixel all is lower than 128 in the caption area, then this pixel is judged to be the background color pixel, and this background color pixel region is undercolor region, otherwise then is text pixel.The transparency of all background color pixels is made as 100%, and promptly the background color (non-legible part) to caption area carries out hollow out, thereby can obtain removing the caption area of background color.
Caption area after 404 pairs of hollow outs of display module amplifies according to the required ratio of the full frame amplification of image, and the caption area that captions are filled to after the amplification shows.Full-screen image is meant that television image reaches the image of full screen display through the equal proportion amplification in the present embodiment.For the widescreen mute of 16:9, the required ratio of the full frame amplification of image is 4:3, and the magnification ratio of caption area and the magnification ratio of image-region are consistent, and are 4:3.
Therefore; After caption area behind the removal background color is multiplied by the magnification ratio coefficient according to original caption area size; Captions viewing area after can obtaining amplifying; Be the width of original caption area and be multiplied by proportionality coefficient highly respectively after width and height after obtaining amplifying, and the width after the said amplification and highly be the captions viewing area after the said amplification.The captions viewing area is shown enlarged in the lowermost end of the image after the full frame amplification.Then, the captions that read are filled into the captions viewing area after the amplification, have promptly realized the stack of captions on television image, the caption area that has captions of enlarged and displayed is as shown in Figure 4 in proportion with full-screen image.
Present embodiment is through obtaining caption area; Undercolor region to caption area is carried out transparent processing; With the caption area of handling according to amplifying and be shown to the lowermost end of screen with the required ratio of the full frame amplification of image; Thereby it is full frame to have realized that captions and image are amplified to same ratio, has prevented the problem that captions are lost simultaneously again.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the captions processing method of a video pictures full screen display is characterized in that, comprising:
S1, obtain the information of caption area on the video terminal screen, wherein said information comprises the position coordinates and the size of said caption area;
S2, according to the position coordinates and the size of said caption area, from the image buffer storage district of said video terminal, read the pixel of said caption area;
S3, according to the rgb value of the pixel of said caption area, obtain the undercolor region of said caption area, said undercolor region is carried out hollow out;
S4, the caption area of hollow out is amplified according to the required ratio of the full frame amplification of image, and the caption area that captions are filled to after the amplification shows.
2. method according to claim 1 is characterized in that, said step S2 specifically comprises:
S21, according to the position coordinates of said caption area, in the image buffer storage district of said video terminal
Find said caption area position;
S22, according to the size of said caption area, lock said caption area, with predetermined frequencies read said caption area pixel and the storage.
3. method according to claim 1 is characterized in that, said step S3 specifically comprises:
S31, the rgb value and the preset RGB reference value of the pixel of the caption area that is read compared;
S32, the pixel that will be lower than the caption area of said RGB reference value are judged to be the background color pixel, obtain undercolor region, and wherein undercolor region is background color pixel region;
S33, the transparency of said undercolor region is made as 100% carries out hollow out, obtain the caption area after the undercolor region hollow out.
4. method according to claim 3 is characterized in that, said RGB reference value is 128.
5. according to any described method of claim 1 to 4, it is characterized in that the width of said video terminal screen is 16:9 with the ratio of height; According to the required ratio of the full frame amplification of image is 4:3; Said caption area is shown enlarged in the lowermost end of the image after the full frame amplification.
6. the video terminal that video pictures full screen display carrying out captions are handled is characterized in that, comprising:
Acquisition module is used to obtain the information of caption area on the video terminal screen, and wherein said information comprises the position coordinates and the size of said caption area;
Read module is used for position coordinates and size according to said caption area, from the image buffer storage district of said video terminal, reads the pixel of said caption area;
The hollow out module is used for the rgb value according to the pixel of said caption area, obtains the undercolor region of said caption area, and said undercolor region is carried out hollow out;
Display module is used for the caption area of hollow out is amplified according to the required ratio of the full frame amplification of image, and the caption area that captions are filled to after the amplification shows.
7. video terminal according to claim 6 is characterized in that said read module also is used for the position coordinates according to said caption area, in the image buffer storage district of said video terminal, finds said caption area position; According to the size of said caption area, lock said caption area, read the pixel and the storage of said caption area with predetermined frequencies.
8. video terminal according to claim 6 is characterized in that, the rgb value of the pixel of the caption area that said hollow out module also is used for said read module is read compares with preset RGB reference value; The pixel that will be lower than the caption area of said RGB reference value is judged to be the background color pixel, obtains undercolor region, and wherein undercolor region is background color pixel region; The transparency of said undercolor region is made as 100% carries out hollow out, obtain the caption area after the undercolor region hollow out.
9. video terminal according to claim 8 is characterized in that, said RGB reference value is 128.
10. according to each described video terminal among the claim 6-9, it is characterized in that the width of said video terminal screen is 16:9 with the ratio of height; According to the required ratio of the full frame amplification of image is 4:3; Said caption area is shown enlarged in the lowermost end of the image after the full frame amplification.
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| CN102932607B (en) * | 2012-10-29 | 2015-05-20 | 北京东方艾迪普科技发展有限公司 | Caption graphics and text information generation method and device |
| CN104125496A (en) * | 2014-07-07 | 2014-10-29 | 京东方科技集团股份有限公司 | Method and device for displaying video with caption information |
| WO2016004697A1 (en) * | 2014-07-07 | 2016-01-14 | 京东方科技集团股份有限公司 | Method and apparatus for displaying video with caption information |
| CN107135415A (en) * | 2017-04-11 | 2017-09-05 | 青岛海信电器股份有限公司 | Video caption processing method and processing device |
| CN108174279A (en) * | 2017-12-07 | 2018-06-15 | 四川迪佳通电子有限公司 | Set-top box caption presentation method and system |
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| CN111225288A (en) * | 2020-01-21 | 2020-06-02 | 北京字节跳动网络技术有限公司 | Method and device for displaying subtitle information and electronic equipment |
| US11678024B2 (en) | 2020-01-21 | 2023-06-13 | Beijing Bytedance Network Technology Co., Ltd. | Subtitle information display method and apparatus, and electronic device, and computer readable medium |
| CN111669664A (en) * | 2020-06-17 | 2020-09-15 | Oppo广东移动通信有限公司 | Video playing method, video playing device, electronic equipment and storage medium |
| CN111669664B (en) * | 2020-06-17 | 2022-06-07 | Oppo广东移动通信有限公司 | Video playing method, video playing device, electronic equipment and storage medium |
| CN113365145A (en) * | 2021-06-03 | 2021-09-07 | 北京字节跳动网络技术有限公司 | Video processing method, video playing method, video processing device, video playing device, computer equipment and storage medium |
| CN113365145B (en) * | 2021-06-03 | 2022-11-08 | 北京字节跳动网络技术有限公司 | Video processing method, video playing method, video processing device, video playing device, computer equipment and storage medium |
| CN113965813A (en) * | 2021-10-21 | 2022-01-21 | 广州方硅信息技术有限公司 | Video playing method and system in live broadcast room and computer equipment |
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