Switch, image transmission apparatus, image transmission method, image display method, image transmitting program product, and image displaying program product

Abstract

A switch selectively switches terminals to which a computer is connected, and can be remotely operated by a remote-control computer connected to a predetermined network. This switch includes: an information acquiring unit that acquires cursor location information from the remote-control computer; an image extracting unit that extracts a cursor peripheral image from an image storing unit that stores an image obtained from the computer, based on the cursor location information acquired by the information acquiring unit; and a cursor image transmitting unit that transmits the cursor peripheral image, extracted by the image extracting unit, to the remote-control computer.

1 . A switch that selectively switches from one terminal to another among a plurality of terminals to which a computer is connected, and that can be remotely operated by a remote-control computer connected to a predetermined network, the switch comprising:
 an information acquiring unit that acquires cursor location information from the remote-control computer;   an image extracting unit that extracts a cursor peripheral image from an image storing unit that stores an image obtained from the computer, based on the cursor location information acquired by the information acquiring unit; and   a cursor image transmitting unit that transmits the cursor peripheral image, extracted by the image extracting unit, to the remote-control computer.   
   
   
       2 . The switch as claimed in  claim 1 , wherein the image extracting unit detects an image change from a difference between a first image obtained from the computer and a second image obtained after the first image, and extracts a predetermined region that includes the changed portion of the second image with respect to the first image. 
   
   
       3 . The switch as claimed in  claim 1 , further comprising an image transmitting unit that transmits a general image to the remote-control computer, wherein,
 when acquiring the cursor location information from the remote-control computer, the image transmitting unit stops transmitting the general image to the remote-control computer,   
     and
 after the cursor peripheral image is transmitted by the cursor image transmitting unit, the image transmitting unit resumes transmitting the general image to the remote-control computer. 
 
   
   
       4 . The switch as claimed in  claim 1 , further comprising an image processing unit that performs image processing on a general image to be transmitted to the remote-control computer, wherein,
 when acquiring the cursor location information from the remote-control computer, the image processing unit stops performing the image processing on the general image, and,   after the cursor peripheral image is transmitted by the cursor image transmitting unit, the image processing unit resumes the image processing on the general image.   
   
   
       5 . The switch as claimed in  claim 3 , wherein the image transmitting unit detects an image change from a difference between a first image obtained from the computer and a second image obtained after the first image, and transmits a predetermined region that includes the changed portion of the second image with respect to the first image, to the remote-control computer. 
   
   
       6 . The switch as claimed in  claim 1 , wherein the image extracting unit extracts the cursor peripheral image at predetermined intervals. 
   
   
       7 . The switch as claimed in  claim 6 , wherein the predetermined intervals are changed in accordance with a preset value transmitted from the remote-control computer. 
   
   
       8 . The switch as claimed in  claim 6 , wherein the predetermined intervals are changed in accordance with the congestion level of the network. 
   
   
       9 . The switch as claimed in  claim 1 , further comprising an image compressing unit that compresses an image to be transmitted to the remote-control computer. 
   
   
       10 . The switch as claimed in  claim 9 , wherein the image compressing unit changes a compression technique or a compression ratio in accordance with the congestion level of the network.