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

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.

A computer-program product comprising a non-transitory tangible computer-readable medium having computer-readable instructions thereon, the computer-readable instructions being executable by a processor to cause the processor to perform:

• applying a first frequency modulation in time domain on an original video thereby obtaining a first modulated video;
• and
• 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;
• 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.