Video displaying method, video displaying apparatus, and computer-program product

Patent metadata

Field	Value
Publication number	US-10911713-B2
Application number	US-201816465819-A
Country	US
Kind code	B2
Filing date	Nov 19, 2018
Priority date	Jan 12, 2018
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A video displaying method. The method includes applying a first frequency modulation in time domain on an original video thereby obtaining a first modulated video; applying a second frequency modulation in spatial domain on the first modulated video thereby obtaining a second modulated video including a first invisible-light image; and displaying the second modulating video with a corresponding frame rate. A time-domain frequency of the first invisible-light image is in a first range unrecognizable by a naked eye and recognizable by a video recorder. A spatial-domain frequency of the first invisible-light image is in a second range unrecognizable by the naked eye and recognizable by a video recorder.

First claim

What is claimed is:

1. A video displaying method, comprising:
applying a first frequency modulation in time domain on an original video thereby obtaining a first modulated video;
applying a second frequency modulation in spatial domain on the first modulated video thereby obtaining a second modulated video comprising a first invisible-light image; and
displaying the second modulating video with a corresponding frame rate;
wherein a time-domain frequency of the first invisible-light image is in a first range unrecognizable by a naked eye and recognizable by a video recorder; and
a spatial-domain frequency of the first invisible-light image is in a second range unrecognizable by the naked eye and recognizable by a video recorder;
wherein applying the first frequency modulation comprises performing N numbers of times frequency multiplication on the original video to obtain a third modulated video having a video frame rate in a third range;
wherein N≥2;
the video frame rate is N times a video frame rate of the original video; and
a respective one of frame images in the original video is converted into N numbers of continuous sub-frame images.

2. The video displaying method of claim 1 , wherein the first range is greater than a maximum time-domain frequency recognizable by the naked eye, and is within a range of time-domain frequency recognizable by a video recorder; and
the second range is greater than a maximum spatial-domain frequency recognizable by the naked eye, and is within a range of spatial-domain frequency recognizable by the video recorder.

3. The video displaying method of claim 1 , wherein the third range is greater than a maximum video frame rate recognizable by the naked eye and within a range recognizable by the video recorder.

4. The video displaying method of claim 1 , wherein applying the second frequency modulation comprises:
dividing frame images in the third modulated video into N equivalent groups of frame images, the N numbers of continuous sub-frame images converted from the respective one of the frame images of the original video are respectively grouped into the N equivalent groups of frame images; and
superimposing N numbers of first images respectively onto the N equivalent groups of frame images, the N numbers of first images being different from each other;
wherein a superimposed image of adjacent first images of the N numbers of first images constitutes a background image of a single grayscale and a single color; and
a respective one of the N numbers of first images has a spatial-domain frequency in the second range.

5. The video displaying method of claim 4 , wherein the second range is greater than a maximum spatial-domain frequency recognizable by the naked eye, and is within a range of spatial-domain frequency recognizable by the video recorder.

6. The video displaying method of claim 1 , wherein applying the second frequency modulation comprises:
dividing frame images in the third modulated video into M groups of frame images, a respective one group of the M groups of frame images comprising the N continuous sub-frame images converted from a respective one of the frame images of the original video; and
replacing one sub-frame images of the N continuous sub-frame images in the respective one group of the M groups of frame images with a respective one of M numbers of first images;
wherein M is a total number of frame images in the original video;
the M numbers of first images being different from each other, sub-images of any two different groups of the M groups of frame images being replaced by two different first images of the M numbers of first images;
wherein a superimposed image of adjacent first images of the M numbers of first images constitutes a background image of a single grayscale and a single color; and
the respective one of the M numbers of first images has a spatial-domain frequency in the second range.

7. The video displaying method of claim 6 , wherein the second range is greater than a maximum spatial-domain frequency recognizable by the naked eye, and is within a range of spatial-domain frequency recognizable by the video recorder.

8. The video displaying method of claim 1 , wherein displaying the second modulated video with the corresponding frame rate comprises displaying the second modulated video according to a video frame sequence and the video frame rate of the third modulated video.

9. The video displaying method of claim 1 , further comprising simultaneously projecting a modulation light onto a video image when displaying the second modulated video;
wherein a time-domain frequency of the modulation light is in a range unrecognizable by the naked eye and recognizable by a video recorder; and
a spatial-domain frequency of the modulation light is in a range unrecognizable by the naked eye and recognizable by a video recorder.

10. The video displaying method of claim 9 , wherein the time-domain frequency of the modulation light is greater than a maximum time-domain frequency recognizable by the naked eye, and is within a range of time-domain frequency recognizable by a video recorder; and
the spatial-domain frequency of the modulation light is greater than a maximum spatial-domain frequency recognizable by the naked eye, and is within a range of spatial-domain frequency recognizable by the video recorder.

11. The video displaying method of claim 1 , wherein the time-domain frequency of the first invisible-light image is greater than 24 Hz.

12. The video displaying method of claim 11 , wherein the first range is approximately 300 Hz to approximately 400 Hz.

13. The video displaying method of claim 1 , wherein the second range is approximately 60 c/deg to approximately 200 c/deg.

14. The video displaying method of claim 1 , wherein the first invisible-light image is one or a combination of a word, a stripe, and a two-dimensional barcode.

15. A video displaying apparatus, comprising:
a display apparatus;
a memory; and
one or more processors;
wherein the memory and the one or more processors are connected with each other; and
the memory stores computer-executable instructions for controlling the one or more processors to:
apply a first frequency modulation in time domain on an original video thereby obtaining a first modulated video; and
apply a second frequency modulation in spatial domain on the first modulated video thereby obtaining a second modulated video comprising a first invisible-light image;
wherein a time-domain frequency of the first invisible-light image is in a first range unrecognizable by a naked eye and recognizable by a video recorder; and
a spatial-domain frequency of the first invisible-light image is in a second range unrecognizable by the naked eye and recognizable by a video recorder;
wherein the display apparatus is configured to play the second modulating video with a corresponding frame rate;
the memory further stores computer-executable instructions for controlling the one or more processors to apply the first frequency modulation by performing N numbers of times frequency multiplication on the original video to obtain a third modulated video having a video frame rate in a third range;
N≥2;
the video frame rate is N times a video frame rate of the original video; and
a respective one of frame images in the original video is converted into N numbers of continuous sub-frame images.

16. The video displaying apparatus of claim 15 , wherein the memory further stores computer-executable instructions for controlling the one or more processors to:
divide frame images in the thi

Assignees

• Boe Technology Group Co Ltd
• Jiaxing Sec View Information Tech Co Ltd

Inventors

• Li Yingyi
• Liu Kairan
• Li Wenbo
• Zhu Lin
• Zhai Guangtao

Classifications

• H04N9/3179 Primary

  Video signal processing therefor · CPC title

• H04N2005/91307

  by adding a copy protection signal to the video signal · CPC title

• H04N9/3147

  Multi-projection systems (video walls G06F3/1446) · CPC title

• H04N5/913 Primary

  for scrambling {; for copy protection} · CPC title

• H04N2005/91392

  using means for preventing making copies of projected video images · CPC title