CN113905268A - Black edge removing method for screen projection display of mobile terminal - Google Patents
Black edge removing method for screen projection display of mobile terminal Download PDFInfo
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- CN113905268A CN113905268A CN202111144881.0A CN202111144881A CN113905268A CN 113905268 A CN113905268 A CN 113905268A CN 202111144881 A CN202111144881 A CN 202111144881A CN 113905268 A CN113905268 A CN 113905268A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000000007 visual effect Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/485—End-user interface for client configuration
- H04N21/4858—End-user interface for client configuration for modifying screen layout parameters, e.g. fonts, size of the windows
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Human Computer Interaction (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention discloses a method for removing black edges of screen projection display of a mobile terminal, which comprises the following steps: the large-screen equipment obtains data cache, resolution and rotation angle of a screen projection image pushed by the current mobile terminal; sampling and comparing two central axes of the central point of the screen projection image point by point; calculating a cutting effective area; displaying the effective image on the whole screen; according to the characteristics of the screen projection image of the mobile phone, pixel values of points at two axis positions are sampled point by point, then comparison calculation is carried out, the size of a black edge of the screen projection image is determined, effective display contents are selected and then appropriately amplified and rotated, the effect of displaying the effective contents of the screen projection image to the maximum is achieved, and the visual experience of a user is improved.
Description
Technical Field
The invention relates to the technical field of audio and video, in particular to a method for removing black edges of screen projection display of a mobile terminal.
Background
The mobile phone screen projection is that the content in the mobile phone is synchronously mapped to large-screen display equipment such as televisions, PCs and the like in the same local area network through a wireless network, the content of the whole screen of the mobile phone can be copied to the large screen, including a control status bar menu on the mobile phone, and all operations on the mobile phone can be displayed on the large screen. The method is widely applied to various scenes such as conferences, games, audio and video playing, picture browsing and the like. The wireless screen projection is mainly realized by AirPlay, Miracast, DNLA and the like. In recent years, with the development of mobile phone software and the enhancement of mobile phone processing capability, various daily application frequencies on mobile phones have surpassed those of electronic products such as PCs and televisions, and mobile phones are one of the most widely used electronic products. The mobile phone screen projection application can make up for a short board with a small mobile phone screen to a great extent, and the display effect of the mobile phone screen projection content is directly related to the experience and evaluation of a user on a product. The screen projection display effect is improved, and the user visual experience is improved to become one of the core requirements of consumer electronics and household appliances.
Most smart phones in the market at present support a screen projection function, and users can project screens to large-screen equipment to improve the watching effect in application occasions such as opening videos, pictures and documents. However, the resolution of the mobile phone and the resolution of media contents such as videos, pictures, documents and the like may be different, and different mobile phone brands and screen projection software have different processing modes for the mobile phone screen contents when the mobile phone screen is intercepted, the contents are processed and sent to the large-screen device. Therefore, in some occasions, each frame of image projected by the mobile phone is not necessarily exactly complete media display content, and some images have upper and lower black edges. For such an image with upper and lower black borders, if the large-screen device directly displays the image without processing, the content of the mobile phone displayed on the large screen has the black borders, which affects the viewing effect of the user. Therefore, the problem can be solved by performing calculation analysis on the display image data transmitted by the mobile phone and displaying the effective display content on the screen after removing the black edge.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for removing black edges of screen projection display of a mobile terminal, and the method improves the visual experience of a user.
In order to achieve the purpose, the invention adopts the technical scheme that: a black edge removing method for screen projection display of a mobile terminal comprises the following steps:
step 1, large-screen equipment obtains data cache, resolution and rotation angle of a screen projection image pushed by a current mobile terminal;
step 2, sampling and comparing two central axes of the central point of the screen projection image point by point: after the resolution of the screen projection image is obtained, determining the width and the height of the screen projection image through the resolution, sampling point by point from outside to inside to obtain pixel values of four points of two central axes of a central point of the image, then moving one coordinate inwards longitudinally or inwards transversely each time, comparing the pixel values of a left sampling point, a right sampling point, an upper sampling point, a lower sampling point and a black sampling point after the pixel values of four points are obtained for n times, if the pixel values of the two points on the upper side n and the lower side n are not equal to the pixel values of black and the previous time is equal to each other, considering the size of the upper frame and the lower frame of black as n, and if the pixel values of the two points on the left side m and the right side m are different from the pixel values of black and the previous time is equal to each other, considering the size of the left frame and the right frame of black as m, and sampling and comparing point by point until the width of the upper frame and the lower frame are determined as n and the width of the left frame and the right frame as m;
step 3, calculating a cutting effective area: calculating four point coordinates of an effective rectangular display area of the image with the black frame removed according to the width n of the upper and lower black frames and the width m of the left and right black frames obtained in the step 2 and the image resolution pushed by the mobile terminal;
and 4, displaying the effective image on the whole screen: the four coordinate points of the effective cutting area are used as parameters, the effective area which is finally displayed is set through the system display setting interface, the maximum resolution supported by the current screen is obtained through the system interface, and the effective area of the image is displayed on the screen in a full screen mode through carrying out proper scaling through the system display interface in combination with the rotation angle of the image, so that the effect of removing the black edges in the display is achieved.
As a further improvement of the present invention, the step 1 specifically comprises the following steps:
when a user operates the mobile terminal to start to project a screen to large-screen equipment, the large-screen equipment end acquires image data and parameters through a data interface; in an android large-screen equipment system, bitmap data of an image projected by a mobile terminal application screen is obtained through textview displayed by the current screen, and the resolution and the rotation angle of the image are obtained through a broadcast control interface.
As a further improvement of the present invention, the mobile terminal is a smart phone, and the large-screen device is a television.
The invention has the beneficial effects that:
according to the characteristics of the screen projection image of the mobile phone, the pixel values of the points at the positions of the two central axes are sampled point by point from outside to inside, then the comparison calculation is carried out, the size of the black edge of the screen projection image is determined, then the effective display content can be selected and then the effective display content is properly amplified and rotated, the effect of displaying the effective content of the screen projection image to the maximum extent is achieved, and the visual experience of a user is improved.
Drawings
Fig. 1 is a flow chart of embodiment 2 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
A black edge removing method for screen projection display of a mobile terminal comprises the following steps:
A) obtaining data cache, resolution and rotation angle of a screen projection image pushed by the current mobile phone:
when a user operates a mobile phone to start to project a screen to a large-screen device (such as a television), a large-screen device end needs to acquire image data and parameters through a data interface. In an android television system, bitmap data of an image projected by a mobile phone application screen can be obtained through textview displayed by the current screen, and parameters such as resolution, rotation angle and the like of the image can be obtained through a broadcast control interface.
B) Sampling and comparing two central axes of the central point of the screen projection image point by point:
because the image displayed on the television can only be rectangular, after the resolution of the screen projection image is obtained, the width and the height of the screen projection image can be determined through the resolution, and then the pixel values of four points of two central axes of the central point of the image are obtained through point-by-point sampling from outside to inside. If the image resolution is 1920 x 1080, then the upper left coordinate of the image is (0, 0) and the lower right coordinate is (1920,1080). The center point coordinate of the image is (960,540) and the x, y coordinates of the two central axes are x 960 and y 540, respectively. The four outermost points of the initial sampling are, respectively, positive upper 0(960,0), positive left 0(0,540), positive right 0(1920,540), positive lower 0(960,1080), the second sampling point is shifted inward by one coordinate longitudinally or laterally on the basis of the last sampling point, respectively, positive upper 1(960,0+1), positive left 1(0+1,540), positive right 1 (1920-one 1,540), positive lower 1(960,1080-1), so that the four points of the n +1 th sampling are, respectively, positive left n (n,540), positive right n (1920-n,540), positive upper n (960, n), and positive lower n (960,1080-n). After the pixel values of four points are obtained n times, the pixel values of the left and right and upper and lower sampling points need to be compared. According to the characteristics of up-down and left-right symmetry of a screen projected image of a mobile phone, if pixel values of two points, namely the upper n point and the lower n point, are not equal to the pixel values of black and are equal for the last time, the size of a black upper frame and the size of a black lower frame are considered to be n, and if the pixel values of two points, namely the left m point and the right m point, are different from the pixel values of black and are equal for the last time, the size of a left frame and the size of a right frame of the black frame are considered to be m. And sampling and comparing point by point until the widths of the upper black frame and the lower black frame are determined to be n and the widths of the left black frame and the right black frame are determined to be m.
C) Calculating a cutting effective area:
through the width n of the upper and lower black frames obtained in the last step and the width m of the left and right black frames obtained in the last step, in combination with the image resolution pushed by the mobile phone, the coordinates of four points of the effective rectangular display area of the image without the black frames can be calculated, for example, when the image resolution is 1920 × 1080, the upper left corner coordinate of the effective rectangular display area of the image is (m, n), the upper right corner coordinate is (1920-m, n), the lower left corner coordinate is (m, 1080-n), and the lower right corner coordinate is (1920-m, 1080-n).
D) Displaying the effective image on the whole screen:
the four coordinate points of the effective cutting area are used as parameters, the effective area which is finally displayed is set through the system display setting interface, the maximum resolution supported by the current screen is obtained through the system interface, and proper scaling can be carried out through the system display interface by combining the rotation angle of the image, so that the effective area of the image can be displayed on the screen in a full screen mode, and the effect of removing the black edges in the display is achieved.
Example 2
As shown in fig. 1, a method for removing black borders in screen projection display of a mobile terminal includes:
step 1: the television acquires parameters such as data cache, resolution (Xmax, Ymax), rotation angle and the like of a screen projection image pushed by a current mobile phone through a display interface;
step 2: sampling pixel value data of four points of two central axes with the coordinate x being Xmax/2 and the coordinate y being Ymax/2 point by point from outside to inside, wherein if the image resolution is 1920 × 1080, the four points sampled at the n +1 th time are respectively positive left n (n,540), positive right n (1920-n,540), positive top (960, n) and positive bottom 1(960,1080-n);
and step 3: comparing the pixel values of the left sampling point, the right sampling point, the upper sampling point and the lower sampling point respectively through the pixel value data of the four points obtained in the last step, and judging whether non-black pixels exist or not; if the pixel values are all black pixels, n is n +1, executing the step 2, and continuously acquiring pixel value data of four more inner points; if the non-black pixel exists, entering the step 4;
and 4, step 4: the n value of the first time from the black pixel to the non-black pixel is the width of the black frame, and the widths of the black upper frame, the black lower frame, the black left frame and the black right frame are obtained through step-by-step sampling;
and 5: and calculating the coordinates of four points of the effective rectangular display area of the image without the black frame by combining the resolution of the image pushed by the mobile phone. Setting the coordinates of the four points of the obtained effective rectangular display area as a cut effective display area;
step 6: calling a system display setting interface to zoom the image by combining the maximum resolution supported by the current screen and the rotation angle of the pushed image, so that the effective image in the black frame can be displayed on the whole screen;
and 7: and starting to display the image after the black frame is removed.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. A black edge removing method for screen projection display of a mobile terminal is characterized by comprising the following steps:
step 1, large-screen equipment obtains data cache, resolution and rotation angle of a screen projection image pushed by a current mobile terminal;
step 2, sampling and comparing two central axes of the central point of the screen projection image point by point: after the resolution of the screen projection image is obtained, determining the width and the height of the screen projection image through the resolution, sampling point by point from outside to inside to obtain pixel values of four points of two central axes of a central point of the image, then moving one coordinate inwards longitudinally or inwards transversely each time, comparing the pixel values of a left sampling point, a right sampling point, an upper sampling point, a lower sampling point and a black sampling point after the pixel values of four points are obtained for n times, if the pixel values of the two points on the upper side n and the lower side n are not equal to the pixel values of black and the previous time is equal to each other, considering the size of the upper frame and the lower frame of black as n, and if the pixel values of the two points on the left side m and the right side m are different from the pixel values of black and the previous time is equal to each other, considering the size of the left frame and the right frame of black as m, and sampling and comparing point by point until the width of the upper frame and the lower frame are determined as n and the width of the left frame and the right frame as m;
step 3, calculating a cutting effective area: calculating four point coordinates of an effective rectangular display area of the image with the black frame removed according to the width n of the upper and lower black frames and the width m of the left and right black frames obtained in the step 2 and the image resolution pushed by the mobile terminal;
and 4, displaying the effective image on the whole screen: the four coordinate points of the effective cutting area are used as parameters, the effective area which is finally displayed is set through the system display setting interface, the maximum resolution supported by the current screen is obtained through the system interface, and the effective area of the image is displayed on the screen in a full screen mode through carrying out proper scaling through the system display interface in combination with the rotation angle of the image, so that the effect of removing the black edges in the display is achieved.
2. The method for removing the black border of the screen projection display of the mobile terminal as claimed in claim 1, wherein the step 1 is as follows:
when a user operates the mobile terminal to start to project a screen to large-screen equipment, the large-screen equipment end acquires image data and parameters through a data interface; in an android large-screen equipment system, bitmap data of an image projected by a mobile terminal application screen is obtained through textview displayed by the current screen, and the resolution and the rotation angle of the image are obtained through a broadcast control interface.
3. The method for removing the black border of the screen projection display of the mobile terminal as claimed in claim 1 or 2, wherein the mobile terminal is a smart phone and the large screen device is a television.
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Cited By (3)
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| CN114463358A (en) * | 2022-01-30 | 2022-05-10 | 深圳创维－Rgb电子有限公司 | Screen projection display method and device, electronic equipment and readable storage medium |
| CN114463359A (en) * | 2022-01-30 | 2022-05-10 | 深圳创维－Rgb电子有限公司 | Screen projection display method and device, electronic equipment and readable storage medium |
| WO2024012345A1 (en) * | 2022-07-14 | 2024-01-18 | 华为技术有限公司 | Mirroring picture processing method and related apparatus |
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Application publication date: 20220107 |