Image display system

Abstract

An image display system comprising an image supply device, a projector, and a network for connecting the image supply device and the projector, and when images are supplied to the projector via the network from the image supply device, the images are projected by the projector. When projecting and displaying a second image having a second image size based on a first image having a first image size in a projection screen of the projector, the image supply device generates supplied image data including first image data for representing the first image, position data for indicating the display position of the second image in the projection screen, and second image size data for indicating the second image size, and also supplies this to the projector via the network. By doing this, an increase in network traffic is suppressed for the image display system noted above.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an image display system comprising an image supply device and a projector connected via a network, and particularly relates to an image display system that is suitable for displaying of moving images. [0003] 2. Description of the Related Art [0004] In the past, a projector for which a personal computer (hereafter abbreviated as “PC”) which is an image supply device and a projector are connected via a network, and that is able to supply and display an image from the PC to the projector (hereafter called a “network projector”) was proposed (e.g. see International Publication Pamphlet No. 01 / 093583). [0005] Also, an art called VNC (Virtual Network Computing) is used to supply images from a PC via a network to this kind of network projector. [0006] However, with VNC, of the images generated by the image supply device, image data of the area for which the image has changed (change area) (...

AI Technical Summary

Benefits of technology

[0008] Therefore, an object of the present invention is to solve the problems of the prior art noted above by providing an image display system that is able to inhibit an increase in network traffic.

[0010] With the image display system of the present invention, because rather than the projected and displayed second image, the first image which is the source of the second image is transmitted to the projector, even when the second image size is larger than the first image size, for example, the actually transmitted data volume can be made smaller than when transmitting image data that represents the second image, it is possible to inhibit increasing of network traffic, and to greatly improve the response.

[0012] In this way, by the projector generating second image data that represents the second image based on the first image data and the second image size data included in the supplied image data and comprising a function of projecting the second image in the projection screen based on the generated second image data and the position data included in the supplied image data, even when supplied image data that includes first image data, position data, and second image size data is supplied via a network from an image supply device, it is possible to project a second image without problems.

[0014] By doing this, because it is not necessary to obtain the first image size based on the first image data at the projector, this is convenient when generating second image data based on the first image data.

[0018] In this way, according to the image supply device of the present invention, rather than a second projected and displayed image, a first image which is the source of a second image is transmitted to a projector, so even in a case when the second image size is greater than the first image size, for example, it is possible to make the actually transmitted data volume smaller than when transmitting image data representing the second image, making it possible to inhibit an increase in network traffic, and to greatly improve the response.

Problems solved by technology

Because of this, when the size of the change area is large and the data volume of the image data to be transferred is large, there is the problem that the network traffic increases, and the response worsens.

As a result, when displaying a moving image at the expanded screen size, if the network data transmission speed is fixed, the number of frames of a moving image that can be displayed per unit of time will be less than when displaying a moving image at the standard screen size, and there are cases when real time moving image display is not possible.

Images