| 摘要 |
<p>Although video display screens are factory calibrated to correct performance, they 'differ in the actual colour balance presented to the viewer. The screens may be re-calibrated manually and provisions therefor exist, however it is a complexundertaking, if several screens are connected to the same video source. Similarly, theoutput of video sources may vary, in particular from video cameras. Usually a testimage is recorded to provide a reference. According to the invention, each videodisplay screen is connected to the video source via a Central Processing Device, andeach video display screen is calibrated when first installed by means of a test signal having a pre-defined colour balance. The signal is analysed by means of a three- colour sensor, and the information is fed back to the Central Processing Device and stored along with a device identifier. Any subsequent video signal provided to a particular video display screen will be modified electronically by means of individual stored parameters. Video sources will have their output signals similarly modified after having been subjected to a similar analysis performed on a video display screen already calibrated.</p> |
