METHOD OF ZOOMING VIDEO IMAGES AND MOBILE TERMINAL

• US 20170347153A1
• Filed: 08/18/2017
• Published: 11/30/2017
• Est. Priority Date: 04/16/2015
• Status: Active Grant

• Current Assignee: Tencent Technology Company Limited (Tencent Holdings Limited)
• Original Assignee: Tencent Technology Company Limited (Tencent Holdings Limited)
• Inventors: ZUO, Hongtao
• Granted Patent: US 10,397,649 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04806 Zoom, i.e. interaction techniques or interactors for controlling the zooming operation
• CPC Class Codes: G06F 3/0481 based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
• CPC Class Codes: G06F 3/0484 for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
• CPC Class Codes: G06F 3/04845 for image manipulation, e.g. dragging, rotation, expansion or change of colour
• CPC Class Codes: G06F 3/04847 Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/440263 by altering the spatial resolution, e.g. for displaying on a connected PDA

Abstract

The present disclosure provides a method and an apparatus for zooming video images, and belongs to video playing technology. The method may include: receiving a zoom request for zooming a current video frame while a video is being played; determining a zoom center point and a zoom ratio according to the zoom request; determining a target image area to be displayed in a playing window from the current video frame after zooming according to the zoom center point and the zoom ratio; and rendering, in the playing window, image content within the target image area of video frames subsequent to the current video frame when playing subsequent video frames. As such, a user is enabled to selectively zoom video frames according to the needs, thus can clearly see details in the video.

Claims

1. A method of zooming video images, comprising:

at a video player application,

receiving a zoom request for zooming a current video frame while a video is being played;

determining a zoom center point and a zoom ratio according to the zoom request;

determining a target image area to be displayed in a playing window from the current video frame after zooming according to the zoom center point and the zoom ratio; and

rendering, in the playing window, image content within the target image area of video frames subsequent to the current video frame when playing the subsequent video frames.

2. The method of claim 1, wherein determining a target image area to be displayed in a playing window from the current video frame after zooming according to the zoom center point and the zoom ratio comprises:

calculating a reference horizontal coordinate and a reference vertical coordinate according to the zoom ratio;

calculating texture coordinates according to the zoom center point, the reference horizontal coordinate and the reference vertical coordinate;

wherein the texture coordinates comprises coordinates of at least two vertexes of the playing window presenting a zoomed version of the current video frame in an un-zoomed version of the current video frame, the at least two vertexes comprises diagonal vertexes of the playing window; and

determining an area defined by the texture coordinates to be the target image area.

3. The method of claim 2, wherein rendering in the playing window image content within the target image area of video frames subsequent to the current video frame when playing subsequent video frames comprises:

calculating vertex coordinates of the playing window according to the reference horizontal coordinate and the reference vertical coordinate; and

rendering the image content within the target image area of the subsequent video frames in an area defined by the vertex coordinates according to the texture coordinates.

4. The method of claim 1, wherein receiving a zoom request for zooming a current video frame comprises:

receiving a stretch gesture applied to the current video frame and determining the stretch gesture to be a magnify request;

or

receiving a shrink gesture applied to the current video frame and determining the shrink gesture to be a minify request.

5. The method of claim 1, further comprising:

presenting zoom guidance information for guiding a user to zoom video frames.

6. The method of claim 1, further comprising:

receiving a drag request for dragging image content rendered in the playing window that belongs to the target image area of the k'"'"'th video frame, wherein the k'"'"'th video frame is one of the video frames subsequent to the current video frame;

k is a positive integer;

adjusting the target image area according to the dragging request, wherein the target image area which has been adjusted comprises an area to be presented in the playing window from the k'"'"'th video frame after the dragging; and

rendering, in the playing window, image content that falls in the adjusted target image area of a video frame subsequent to the k'"'"'th video frame when playing video frames subsequent to the k'"'"'th video frame.

7. The method of claim 1, further comprising:

receiving a recover request via a recover button; and

playing, in response to the recover request, video frames to be played according to a play mode used before the zooming according to the zoom request.

8. The method of claim 3, wherein calculating vertex coordinates of the playing window according to the reference horizontal coordinate and the reference vertical coordinate comprises:

assuming the reference horizontal coordinate is xCord the reference vertical coordinate is yCord;

determining the vertex coordinates to be;

(xCord, −

yCord), (xCord, yCord)(−

xCord, yCord), and (−

xCord, −

yCord).

9. The method of claim 2, wherein calculating vertex coordinates of the playing window according to the reference horizontal coordinate and the reference vertical coordinate comprises:

if the zoom ratio is smaller than 1,

determining the reference vertical coordinate is

10. The method of claim 2, wherein calculating vertex coordinates of the playing window according to the reference horizontal coordinate and the reference vertical coordinate comprises:

if the zoom ratio is larger than 1, obtaining a first value which is

11. The method of claim 10, further comprising:

if the first value does not reach the first threshold, determining the reference vertical coordinate yCord to be the first threshold;

obtaining a third value which is

12. The method of claim 2, wherein calculating coordinate values of the texture coordinates according to the zoom ratio, the reference horizontal coordinate and the reference vertical coordinate comprises:

obtaining a target horizontal coordinate and a target vertical coordinate of the zoom center point;

determining the target horizontal coordinate to be;

13. A mobile terminal, comprising:

at least one processor; and

a storage device;

wherein the storage device stores at least one program executable by the at least one processor, the at least one program comprises instructions for;

receiving a zoom request for zooming a current video frame while a video is being played;

determining a zoom center point and a zoom ratio according to the zoom request;

determining a target image area to be displayed in a playing window from the current video frame after zooming according to the zoom center point and the zoom ratio; and

rendering, in the playing window, image content within the target image area of video frames subsequent to the current video frame when playing subsequent video frames.

14. The mobile terminal of claim 13, wherein the at least one program comprises instructions for:

calculating a reference horizontal coordinate and a reference vertical coordinate according to the zoom ratio;

calculating texture coordinates according to the zoom center point, the reference horizontal coordinate and the reference vertical coordinate;

wherein the texture coordinates comprises at least two vertexes of the playing window presenting a zoomed version of the current video frame in an un-zoomed version of the current video frame, the at least two vertexes comprises diagonal vertexes of the playing window; and

determining an area defined by the texture coordinates to be the target image area.

15. The mobile terminal of claim 14, wherein the at least one program comprises instructions for:

calculating vertex coordinates of the playing window according to the reference horizontal coordinate and the reference vertical coordinate; and

rendering the image content within the target image area of the subsequent video frames in an area corresponding to the vertex coordinates according to the texture coordinates.

16. The mobile terminal of claim 13, wherein the at least one program comprises instructions for:

receiving a stretch gesture applied to the current video frame and determining the stretch gesture to be a magnify request;

or

receiving a shrink gesture applied to the current video frame and determining the shrink gesture to be a minify request.

17. The mobile terminal of claim 13, wherein the at least one program comprises instructions for:

presenting zoom guidance information for guiding a user to zoom video frames.

18. The mobile terminal of claim 13, wherein the at least one program comprises instructions for:

receiving a drag request for dragging image content rendered in playing window that belongs to the target image area of the k'"'"'th video frame, wherein the k'"'"'th video frame is one of the video frames subsequent to the current video frame;

k is a positive integer;

adjusting the target image area according to the dragging request, wherein the target image area which has been adjusted comprises an area to be presented in the playing window that belongs to the k'"'"'th video frame after the dragging; and

rendering, in the playing window, image content that falls in the adjusted target image area of a video frame subsequent to the k'"'"'th video frame when playing video frames subsequent to the k'"'"'th video frame.

19. The mobile terminal of claim 13, wherein the at least one program comprises instructions for:

receiving a recover request via a recover button; and

playing, in response to the recover request, video frames to be played according to a play mode used before the zooming according to the zoom request.

20. A non-transitory storage medium, comprising computer-readable instructions executable by a processor to:

receive a zoom request for zooming a current video frame while a video is being played;

determine a zoom center point and a zoom ratio according to the zoom request;

determine a target image area to be displayed in a playing window from the current video frame after zooming according to the zoom center point and the zoom ratio; and

render, in the playing window, image content within the target image area of video frames subsequent to the current video frame when playing subsequent video frames.