JPS6030474B2 - Information detection system using a television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information detection system using a television receiver.

As an information detection device using a television receiver, there is a so-called monitor television used in stations, department stores, etc., but this only monitors people's movements by projecting a specific location on a screen. It cannot be said to be very effective because information cannot be obtained unless people are constantly staring at the screen.

The present invention constantly monitors the television monitor video signal of a stationary scene and attempts to detect non-stationary movement information that enters the screen, and is intended to eliminate the influence of the video signal that constantly moves slightly, such as from the leaves of trees. By removing only the moving image and detecting only the moving image, it is possible to measure or count objects or people moving within the screen,
Alternatively, it can be used to issue an alarm or the like when a moving object occurs in a regular scene.

That is, the configuration of the present invention is to compare the video signal of the television receiver with a reference signal as appropriate, determine the black and white level using the black and white level setting circuit, and send the output to a high-speed AD converter under timing control to generate digital data for one screen. Store the information in high-speed memory as a signal, send the information to memory A of the microprocessor, continuously measure the micro-movement state in a steady state for a certain period of time, and calculate the cumulative exclusive OR (or) of the changing information. The total amount of change obtained by
The influence of the steady-state micromotion information is removed by masking the bit information sent from the high-speed memory with the complement of On the other hand, the contents of the high-speed memory that are measured and stored one after another are stored as scene images in memory C, and then masked with the contents of memory A to remove the influence of the steady microtremor information. , compare the contents of memory B and memory C by exclusive ORing,
This device is characterized in that the detected amount of movement is weighed and measured. Next, an example of implementation of the present invention will be explained with reference to the drawings.

Reference numeral 1 denotes a television receiver, and the video signal P is compared with a variable reference signal P2 in a black and white level setting circuit 2 to set the level, and is synchronized by a timing circuit 3 to convert the video signal into a digital signal for one screen. It is converted into bit information by a high-speed AD conversion circuit 4 and sent to a high-speed memory 5.

Reference numeral 6 denotes a direct memory access interface for directly transferring the contents of the high-speed memory 5 to the memory of the microprocessor 7 consisting of a central processing unit 8, a control program 9, memories A, B, C, etc.; This is a switch that changes between steady mode and monitoring mode.

The system of the present invention is configured as described above, and its operation will be explained as follows.

First, switch 10 switches between steady mode and monitoring mode.
When set to steady mode, the video signal P of the television receiver is compared with a variable reference signal P2 in the black and white level setting circuit 2, and a signal (
These signals are detected separately into black and white level signals (hereinafter referred to as black and white level signals). These black and white level signals are associated with 2 bits of information in a 2-bit high-speed AD conversion circuit 4, and are transferred to a high-speed memory 5 as a digital signal for one screen under timing control of a timing circuit 3. For example, one screen is 256 x 256
If it is composed of pixels, the high-speed memory 5 of 1st string B
By using , one screen worth of digital information can be stored using about 1/3 of the actual amount, and this stored information becomes "one screen worth of bit information." Information is loaded into the high-speed memory 5 for each screen using a digital signal from the microprocessor 7, and the contents are refreshed at regular intervals, for example, every 1/3, and the information is loaded into the high-speed memory 5 at high speed through the direct memory access interface 6. By calculating the exclusive OR between the image information before and after the memory 5, the amount of change is stored in the memory A of the microprocessor 7. The above is continuously measured by monitoring the steady mode for a certain period of time (for example, several minutes), and the accumulation (or) of the exclusive OR of changing microtremor information at the time of initial measurement, that is, the leaves of trees in a steady state, etc. The information is set in memory A in bits as cumulative micro-movement information (steady-state micro-movement information).

This process is performed by the control program 9 of the microprocessor 7.

Next, the contents of the high-speed memory 5 are taken into the memory B, and the influence of the steady-state micro-motion information is removed by masking by performing a logical sum with the bit 1 complement of the memory A, and the contents are converted into the steady-state scene image information, i.e. , the stationary scene minus the stationary micromotion information is stored in memory B, and the stationary mode is thus terminated. Next, steady monitoring mode selector switch 1
When 0 is switched to monitoring, the contents of the high-speed memory 5 are transferred to the memory C of the microprocessor 7 by the timing signal of the microprocessor 7, so this is ORed with the number of bits 1 of the memory A to determine the steady state. After removing the influence of the micro-movement information, movement information can be detected by performing an exclusive OR with the stationary scene image information in the memory B, so this is stored in the memory C.

When movement information is detected using the method described above, the number of bits of change in unit movement of an individual can be detected by counting samples of the individual in advance. can be measured.

The present invention provides video signal P of a television receiver 1. Since it is compared with the variable reference signal P2, it is possible to match the brightness of the object to be detected, and since the density of the points to be detected on one screen can be adjusted using the timing circuit 3, it can be matched to the moving speed of the object to be detected. Moreover, since the information on steady micro-tremors such as leaves is stored in the memory A and removed from the detected amount, there is almost no malfunction of the present invention due to the information on steady micro-tremors.

[Brief explanation of the drawing]

The figure is a block diagram showing an example of implementation of the present invention. 1... Television receiver, 2... Black and white level setting circuit, 3... Timing circuit, 4...
2-bit high-speed AD conversion circuit, 5... High-speed memory, 6... Direct memory access interface, 7... Microprocessor, 8... Central processing unit, 9 ...Control program, 10...
・・Standard monitoring mode changeover switch, P. ...Video signal, P2...Variable reference signal.

Claims (1)

[Claims] 1 The video signal from the television receiver is appropriately compared with a reference signal to determine the black and white level using a black and white level setting circuit, and the output is sent to a high speed AD converter under timing control and stored in high speed memory as a digital signal for one screen. , the total amount of change obtained by sending that information to memory A of the microprocessor, continuously measuring microtremor information in a steady state for a certain period of time, and calculating the cumulative exclusive OR (or) of the changing information. is set in bits in memory A as steady-state micro-motion information, and masked by taking the logical sum of bit information for one screen of actual measurement sent from the high-speed memory with the bit 1's complement in memory A. to remove the influence of steady micro-motion information and store it in memory B as steady scene image information (stationary scene minus steady-state micro-motion information), while the contents of the high-speed memory that are successively measured and stored are stored as scene images. After storing it in memory C, mask it with the contents of memory A to remove the influence of steady micro-tremor information, compare the contents of memory B and memory C by exclusive ORing, and measure the detected movement amount. An information detection system using a television receiver, characterized in that: