Method for executing data compression with surveillance hosts
A method for executing data compression is used with a first surveillance host and a second surveillance host communicated with each other via a network. The second surveillance includes a memory device. At first, the first surveillance host compresses video signals into first compressed video data according to a first compression method and uploads the first compressed video data to the network. Next, the second surveillance host downloads the first compressed video data generated by the first surveillance host via the network. Then, the second surveillance host compresses the first compressed video data into second compressed video data according to a second compression method and stores the second compressed video data in the memory device. The second compressed video data has a higher compression ratio than the first compressed video data.
1 . A method for executing data compression with a first surveillance host and a second surveillance host communicated with each other via a network, said second surveillance host comprising a memory device, said method comprising steps of:
compressing video signals into first compressed video data according to a first compression method by the first surveillance host and uploading said first compressed video data to the network;
downloading said first compressed video data generated by the first surveillance host via the network; and
compressing said first compressed video data into second compressed video data according to a second compression method by the second surveillance host and storing said second compressed video data in the memory device,
wherein said second compressed video data has a higher compression ratio than said first compressed video data.
2 . The method according to claim 1 wherein the first surveillance host is connected to at least one camera for receiving said video signals generated by said at least one camera and compressing said video signals into said first compressed video data according to said first compression method.
3 . The method according to claim 2 wherein the second surveillance host downloads said first compressed video data associated with a specific one of said at least one camera and decompresses said first compressed video data to show video on a display.
4 . The method according to claim 1 wherein said first compression method is executed to compress uncompressed video data into said first compressed video data with a first compression ratio, and said second compression method is executed to compress said first compressed video data into said second compressed video data with a second compression ratio, which is higher than said first compression ratio.
5 . The method according to claim 4 wherein said first compressed video data are presented in one selected from a group consisting of MPEG-4 format, MPEG-2 format and AVI format, and said second compressed video data are presented in H.264 format.
6 . The method according to claim 1 wherein the first surveillance host is a digital video recorder (DVR) surveillance computer system and the second surveillance host is a remote computer system capable of remotely controlling said DVR surveillance computer system.
7 . The method according to claim 1 wherein the first surveillance host is a video conference computer system and the second surveillance host is a remote computer system capable of remotely controlling said video conference computer system.
8 . The method according to claim 1 wherein the memory device is a hard disk of the second surveillance host for storing said second compressed video data.