JPS6428581A - Monitoring method and apparatus with tv camera - Google Patents

Abstract

PURPOSE:To enable accurate detection of a moving target, by a method wherein the entire screen is divided into numerous pixels and a signal is sent out when the brightness of a pixel to be newly inputted changes with respect to the brightness of the pixels at the positions thereof already stored. CONSTITUTION:A video output signal 17 sent from a TV camera 2 is applied to a video/synchronous signal separation circuit 20 to be separated into an image signal 18 and a synchronous signal 19, which are sent out to an A/D conversion circuit 26 separately. A synchronous signal control circuit 26 sends numerous division synchronous signals 39 synchronized with the signal 19 to a level memory circuit 22, a counter circuit 28, a sensor memory circuit 34 and a moving object memory circuit 35 to divide a TV screen into numerous sections. On the other hand, the signal 18 is stored into the memory circuit 22 synchronizing the signal 39 while the circuit 22 sends the contents stored immediately before to a subtraction circuit 23, which subtracts a signal newly fed from the preceding contents and sends out an error signal to a comparator circuit 24. The circuit 24 sends an output signal to an OR circuit 27 when an input signal is larger than a reference signal to operate an alarm circuit 30.