Remote screen control device, remote screen control method, and recording medium

摘要

A server apparatus renders a process result of software on an image memory that stores a display image to be displayed on a client terminal, detects an update area in which an update occurs between frames of an image. The server apparatus selectively switches and performs a first generation process and a second generation process according to the number of detected update areas. The first generation process is a process that generates a color map for each update area based on colors used in the update area. The second generation process is a process that generates a color map commonly used between the update areas based on colors used in images of the update areas. The server apparatus reduces the number of colors in an update area using the generated color map and transmits a compressed image of the update area to the client terminal.

主权项

1. A remote screen control device comprising:
a memory; and a processor coupled to the memory, wherein the processor executes a process comprising:
rendering a process result of software on an image memory that stores a display image to be displayed on a terminal apparatus connected via a network;detecting an update area in which an update occurs between frames of the display image;selecting either of a first generation process that generates a color map for each update area based on colors used in an image of the update area, and a second generation process that generates a color map commonly used between the update areas based on colors used in the entire display image or an image of an area that includes all of update areas, according to a number of the detected update areas;performing the first generation process or the second generation process, selected at the selecting;reducing a number of colors in the update areas using the color map generated by performing the first generation process or the second generation process; andfirst transmitting a compressed image of update area to the terminal apparatus, wherein the selecting includes selecting the first generation process when the number of the detected update areas is less than a threshold value, and selecting the second generation process when the number of the detected update areas is greater than or equal to the threshold value.