News Column

Patent Issued for Video Playback Device, Computer Readable Medium and Video Playback Method

August 7, 2014



By a News Reporter-Staff News Editor at Computer Weekly News -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventor Ohbitsu, Toshiro (Kawasaki, JP), filed on March 14, 2012, was published online on July 22, 2014.

The patent's assignee for patent number 8787466 is Fujitsu Limited (Kawasaki, JP).

News editors obtained the following quote from the background information supplied by the inventors: "In recent years, demand for low-priced personal computers (PCs) has increased, and therefore, in order to lower the price of PCs, low-priced, and therefore low-efficiency, components are used for building PCs. For example, most of the low-priced notebook type personal computers (hereafter, which are abbreviated as the notebook PCs) are equipped with a display device, which is a device having a liquid crystal display screen etc., whose response speed is merely 50 fps (frame per second) because a high-priced display device can not be used. When such notebook PC is used to play back a 60 fps HD (High Definition) video content on the Internet, since the display device cannot display images (pictures) at rate of more than 50 fps, the problem is encountered that 10 frames per second are dropped.

"One way that the above problem can be overcome is by reducing the frame rate of videos so as to be able to be played back by low-performance display devices (refer to patent documents 1-4). Here, most of video content are stored in an MPEG format, especially an MPEG-2 format. Every 15 frames of video content in the MPEG-2 format constitute a group. This group is called GOP (Group of Pictures). Decoding of the MPEG-2 video is performed in units of the GOP, and therefore it is difficult to reduce the frame rate by removing some frames. Moreover, since low-priced notebook PC contains, in order to lower its price, a CPU (Central Processing Unit) with slow operation speed, for instance, 1.6 GHz, it is also difficult to reduce the frame rate by performing process that requires much processing power."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "According to an aspect of the invention, a video playback device includes a video acquisition part to acquire a first video data encoded at a first frame rate, the first video data containing multiple frame sequences each including a frame holding both of information about a background image and information about a moving object image, and second frames each holding information about position of the moving object image in itself but not holding information about the background image; a video data generation part to generate, based on the first video data acquired by the video acquisition part, a second video data to be played back at a second frame rate lower than the first frame rate; and a video display part to display video based on the second video data generated by the video data generation part. Further, the video data generation part of the video playback device includes a computing part to compute, with respect to each two contiguous frames in the first video content, position of a virtual moving object image that is situated in between two moving object images in the two contiguous frames; and an frame image creating part to create, with respect to each position of the virtual moving object image computed by the computing part, a frame image containing the background image and the motion object image placed in the computed position, the frame image being a component of the second video data.

"According to another aspect of the invention, a computer readable medium stored with a video playback program for making a computer function as a device that includes a video acquisition part to acquire a first video data encoded at a first frame rate, the first video data including multiple frame sequences each containing a frame holding both of information about a background image and information about a moving object image, and second frames each holding information about position of the moving object image in itself but not holding information about the background image; a video data generation part to generate, based on the first video data acquired by the video acquisition part, a second video data to be played back at a second frame rate lower than the first frame rate; and a video display part to display video based on the second video data generated by the video data generation part, and the video data generation part includes a computing part to compute, with respect to each two contiguous frames in the first video content, position of a virtual moving object image that is situated in between two moving object images in the two contiguous frames; and an frame image creating part to create, with respect to each position of the virtual moving object image computed by the computing part, a frame image containing the background image and the motion object image placed in the computed position, the frame image being a component of the second video data.

"According to still another aspect of the invention, a video playback method includes acquiring a first video data encoded at a first frame rate, the first video data including multiple frame sequences each containing a frame holding both of information about a background image and information about a moving object image, and second frames each holding information about position of the moving object image in itself but not holding information about the background image; generating, based on the first video data acquired by the acquiring, a second video data to be played back at a second frame rate lower than the first frame rate; and displaying video based on the second video data generated by the generating, and the generating includes computing, with respect to each two contiguous frames in the first video content, position of a virtual moving object image that is situated in between two moving object images in the two contiguous frames; and creating, with respect to each position of the virtual moving object image computed by the computing, a frame image containing the background image and the motion object image placed in the computed position, the frame image being a component of the second video data.

"The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.

"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed."

For additional information on this patent, see: Ohbitsu, Toshiro. Video Playback Device, Computer Readable Medium and Video Playback Method. U.S. Patent Number 8787466, filed March 14, 2012, and published online on July 22, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8787466.PN.&OS=PN/8787466RS=PN/8787466

Keywords for this news article include: Fujitsu Limited.

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Source: Computer Weekly News


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