| 摘要 |
PURPOSE:To achieve an always stable detection of a congestion level, by providing a lighting controller for an elevator hall to control a difference between a reference and imaging information within a specified value when it continues to exceed the specified value for a specified time of period. CONSTITUTION:The state of a vacant elevator hall is taken with a TV camera 1 on reference lighting conditions and stored into a video memory 3 through an A/D converter 2. Under the control of a CPU 5, the contents of the memory 3 are trans ferred through an input port 8 to be compared with a reference of a data memory 7 per pixel. When the number of pixels with the brightness exceeding a specified value is counted to calculate a congestion level and congestion level information 9a is sent to an elevator controller 13 from an output port 9. As changes in the bright ness of image pick up information continue for a specified time length, a control output 9b corresponding to the difference with the reference value is outputted to a controller 11 through the output port 9 to vary the brightness of lighting whereby the difference in the brightness between the reference and the image pick up informa tion is controlled within the specified value. This permits automatic correction of the brightness of the elevator hall thereby enabling highly accurate detection of the congestion level. |
