초록 ▼

A video image signal processing and recording system provides for operation in a first mode in which real time display of video is provided and in a second mode in which the video image signals are digitized and stored in a memory and being read out and displayed in response to selection of a displa

A video image signal processing and recording system provides for operation in a first mode in which real time display of video is provided and in a second mode in which the video image signals are digitized and stored in a memory and being read out and displayed in response to selection of a display mode for the system. In an enhanced mode operation for the system, increasing of the low light intensity value of the displayed real time images or displayed memory images to compensate for low light conditions or for the effects of back lighting. The video image signal processing and recording system is described with reference to an application in a door entry system for a residential building.

대표청구항 ▼

[ We claim:] [1.] A video surveillance system for monitoring and recording images within a surveillance area, comprising:a video camera for viewing images in said area and for providing analog video image signals:input means including analog to digital converting means for converting said analog vid

[ We claim:] [1.] A video surveillance system for monitoring and recording images within a surveillance area, comprising:a video camera for viewing images in said area and for providing analog video image signals:input means including analog to digital converting means for converting said analog video image signals into digital video image signals;memory storage means;a video monitor for displaying video images;signal processing means for processing said digital video image signals for normally causing said images to be successively displayed in real time on said video monitor, and for selectively storing certain of said digital video image signals in said memory means;read out means for causing said processing means to read said digital video image signals out of said memory means;output means including digital to analog signal converting means for converting said digital video image signals read out of said memory means into analog video image signals for application to said video monitor; andfirst switch means actuated by an event within said surveillance area and operative to trigger said processing means to store in said memory means certain digital video image signals representing at least a first video image.