Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
1999-04-17
2002-04-23
Tung, Kee M. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S605000, C709S200000
Reexamination Certificate
active
06377271
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an image data transferring system, an image data transferring apparatus and a method thereof for efficiently transferring image data including a GUI (graphical user interface) image through a network.
BACKGROUND OF THE INVENTION
It has been popularly practiced to transfer image data via a network and display the transferred data for example, by connecting a personal computer to the internet to display image data from the world wide web (WWW). For example, PUPA 8-130656 discloses an invention to change the number of colors of image data depending on the movement of an image. Image data generally contains a large amount of data and needs a long time for being transmitted via a network. For this reason, when an image containing many changes is transmitted, the bandwidth (transmission rate) of the network cannot follow the change of the image, inducing a problem that the display of the image is disturbed or the movement of the image is not natural. In order to solve such a problem, it may be considered to apply the invention disclosed in the aforementioned Japanese reference relating to a method for taking in a color image to the transmission of image data. However, the method described therein discloses none of the technical matters required for applying it to the transmission of image data via a network. Even if the described method could be applied to image data transmission, a user would have to continually pay attention to the change of the image and change the number of colors of the data every time the degree of the change of the image varies.
The present invention is conceived in view of the problem of the prior art described in the above and aims at providing an image data transferring system, an image data transferring apparatus and a method thereof for efficiently transferring image data via a network.
It is, therefore, an object of this invention to provide an image data transferring system, an image data transferring apparatus and a method thereof which can optimize the quality of an image and the change of the image depending on the bandwidth (transmission rate) of the network by adjusting the amount of image data depending on the change of the image, i.e., transmitting more images with less amount of data when images of many changes are transmitted while transmitting a high quality image with a larger amount of data when the change of the image is less.
It is another object of this invention to provide an image data transferring system, an image data transferring apparatus and a method thereof which can automatically switch between an image of reduced color and an image of color which is not reduced for displaying the image, without requiring the user to monitor the change of the image and operate depending on the change.
It is yet another object of this invention to provide an image data transferring system, an image data transferring apparatus and a method thereof which can adjust the amount of image data depending on the movement of the image and transmit an image of a necessary and sufficient quality from a transmitting side to a receiving side to reduce the load on a server device supplying the image data and reduce the load on the network.
SUMMARY OF THE INVENTION
These and other objects are realized by the present invention comprising an image data transferring system for transferring data from an image data transmitting apparatus to an image data receiving apparatus, said image data transmitting apparatus comprising; reduced data generating means for generating reduced data by reducing the amount of data of continuously inputted image data (input data), delta data generating means for generating image data of the delta between said input data and said reduced data (delta data), delta detection means for detecting a delta between consecutive ones of said input data, and image data transmitting means for transmitting to said image data receiving means said transmission data with identifier data attached thereto indicating that it is said delta data when no delta is detected between consecutive ones of said input data for a predetermined period and transmitting said transmission data with identifier data attached thereto indicating that it is said reduced data when a delta is detected between consecutive ones of said input data for a predetermined period, said image data receiving apparatus comprising; transmission data receiving means for receiving said transmission data, and image displaying means for displaying an image indicated by said reduced data included in said transmission data when said identifier data of the received transmission data indicates that it is said reduced data, and displaying the image indicated by said reduced data with the image indicated by said delta data added thereto when said identifier data of the received transmission data indicates that it is said delta data.
This invention also provides an image data transferring apparatus for transmitting transmission data to an image data receiving apparatus which receives said transmission data and displays, when said identifier data of the received transmission data indicates that it is reduced data, which is image data consecutively inputted to said image data transmitting device (input data) subtracted by a data amount, an image indicated by said reduced data included in said transmission data, and displays, when said identifier data of the received transmission data indicates that it is delta data which is the delta between said input data and said reduced data, the image indicated by said reduced data with the image indicated by said delta data added thereto, said image transferring apparatus comprising; reduced data generating means for generating said reduced data, delta data generating means for generating said delta data, delta detection means for detecting a delta between consecutive ones of said input data, and image data transmitting means for transmitting to said image data receiving apparatus said transmission data with identifier data attached thereto indicating that it is said delta data when no delta is detected between consecutive ones of said input data for a predetermined period and transmitting said transmission data with an identifier data attached thereto indicating that it is said reduced data when a delta is detected between consecutive ones of said input data for a predetermined period.
Preferably, said reduced data generating means generates reduced color data having data amount reduced by reducing the number of colors of said input data as said reduced data, said delta data generating means generates said delta data indicating the delta between said input data and said reduced color data, said delta detection means detects said delta when there is a delta between said input data and the input data inputted before or after said former input data, and said image data transmitting means transmits said reduced color data or said delta data with said identifier data added thereto as said transmission data depending on whether or not a delta is detected in the input data.
Preferably, said image data receiving apparatus displays the image indicated by said reduced data with an image indicated by reduced data which is received later than said former reduced data added thereto, said delta data generating means stores said inputted input data (first input data) to generate input delta data indicating a delta between said stored first input data and input data which is inputted after said stored first input data (second input data) and generates said reduced color data by reducing the number of colors of said generated input delta data, and said delta data generating means reduces the number of colors of said stored first input data to generate said delta data by taking the delta between said first input data and said color reduced first input data.
The image data transmitting apparatus of this invention transmits transmission data for displaying an image without reducing the number of colors thereof when there is no delta
Mori Aya
Muta Hidemasa
Sobue Tatsuya
Dougherty Anne Vachon
International Business Machines - Corporation
Shofi David M.
Tung Kee M.
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