JPS63155976A - Pyroelectric camera device - Google Patents

Abstract

PURPOSE:To reduce the cost by picking up the image at the panning mode at all times in using a pyroelectric camera and finding out a mobile body within the visual range, detecting the gravity center of the pattern immediately from the obtained output signal and driving the camera head so as to trace and reproduce the object intermittently thereby simplifying the device. CONSTITUTION:An infrared ray is obtained on the image forming face of a pyroelectric 2-dimension sensor 3 via an infrared ray lens 2 and the image is picked up by the panning mode at all times. Thus, an output signal is generated from only a part subject to temperature change by using the pyroelectric 2-dimension sensor 3. The signal is amplified to a prescribed amplitude by a signal amplifier 5, converted into a binarized signal, which is processed by a signal processing arithmetic circuit 6, the signal is formed into picture elements, and the gravity center is obtained from the picture element number and each picture element through the weighted arithmetic processing. Then a deviation is obtained from a predetermined tracing reproduction reference point on the reproduced pattern and the said data to generate the head control signal 7. The signal 7 is fed intermittently to a camera rotary head drive section 4 thereby changing the azimuth of the pyroelectric camera 1 in a direction of the mobile body.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pyroelectric camera device for tracking and imaging a moving object.

Conventional technology Conventionally, in order to track and image a moving object among the images reproduced by a chimp camera, the reproduced image of a visible camera or an infrared camera is stored, and after extracting a moving object by comparing two surfaces, A method is known in which a camera mount is controlled to capture an image in the direction of a moving object.

Also, a method using a pyroelectric infrared camera is conventionally known. In this pyroelectric infrared camera, the reproduced image in panning mode is of an object, and the reproduced image is obtained only when the writing camera pans. In surveillance applications, the camera is generally fixed, and when a moving object comes within its field of view, the signal of the moving object is reproduced. Also, at this time, the bird that generated the chopper from the signal of the moving object shifts to chopper mode with the signal and monitors with continuous playback.

Problems to be Solved by the Invention However, in the former case, two images obtained at different times are compared via a memory circuit to extract a moving object, so a complicated memory circuit and peripheral circuits are required. In addition, it becomes difficult to extract moving objects from the background image. On the other hand, in the latter case.

There are problems such as slow tracking speed.

Therefore, the present invention aims to solve the problems of the conventional example as described above, and it is possible to simplify the structure of the device, reduce costs, improve the reliability of the tracking operation, and further improve the reliability of the tracking operation. The present invention aims to provide a pyroelectric camera device that can increase tracking speed.

Means for solving the problems and technical means of the present invention for solving the above problems include a pyroelectric camera section having a pyroelectric two-dimensional section;
The coordinates of the center of gravity of the signal for the entire screen are directly determined from the image signal in the panning mode reproduced using the camera rotation mount drive unit and the above-mentioned pyroelectric two-dimensional sensor, and the deviation with respect to a predetermined reference point on the screen is determined. means for outputting a gantry control signal proportional to the camera rotating gantry driving section to change the orientation of the pyroelectric camera section and move the center of gravity of the reproduced image to a reference point, The drive is repeated intermittently, and the infrared image in the panning mode is constantly tracked and reproduced.

action The effects of the above technical means are as follows.

In other words, when a moving object occurs within the field of view using a pyroelectric camera, the image is captured in panning mode from beginning to end, the center of gravity position on the screen is directly detected from the output signal obtained, and the camera mount is driven to locate the object. is tracked and played intermittently. Then, while the gantry is driving, the moving object and its background image are reproduced, and from the end of the drive until the start of the next drive, only the moving object is reproduced, and at the same time, the position of the object is detected and the next gantry control signal is generated. be able to. Therefore, it is possible to eliminate the need for the conventional two-screen comparison circuit and its peripheral circuits, simplify the moving object signal extraction circuit, eliminate the relationship with the background image of the object, and further improve the tracking speed. can be made faster.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. The figure is a block circuit diagram of a pyroelectric camera mount according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a pyroelectric camera unit that performs imaging in the infrared light range, and includes an infrared V lens 2 and a pyroelectric two-dimensional sensor 3. 4 is the camera rotation mount drive unit.

5 is a signal amplifier that amplifies the output signal from the pyroelectric two-dimensional sensor 3; 6 is a signal processor that processes the signal amplified by the signal amplifier 5, calculates the center of gravity, and generates the gantry control signal 7;
The arithmetic circuit 8 is an image output terminal.

Next, the operation of the above embodiment will be explained.

An infrared image is obtained on the imaging plane of the pyroelectric two-dimensional sensor 3 via the infrared lens 2, but the image is captured in panning mode from beginning to end. Therefore, the pyroelectric two-dimensional sensor 3 generates an output signal only in the portion where the temperature has changed. This signal is passed through the signal amplifier 5
The signal is amplified to a constant amplitude and converted into a binary signal. This binarized signal is directly processed by the signal processing and arithmetic circuit 6, the binarized input signal is pixelated, and the center of gravity is determined by the number of pixels and f-ta calculation processing that weights each pixel. .

Next, the deviation between this data and a predetermined tracking and reproduction reference point on the reproduction screen is determined, and a gantry control signal 7 is generated. This gantry control signal 7 is intermittently applied to the camera rotation gantry driving section 4 at intervals of several frames to several tens of frames of the television screen, thereby changing the direction of the pyroelectric camera section 1 toward the moving object. After the signal processing and arithmetic circuit 6 takes in the calculated data for the input car screen, it does not accept input data until at least from the next frame the driving of the camera rotating mount drive unit 4 is completed and the background pattern disappears.

By the action of the above control signals, the moving object image signal is always sent from the image output terminal 8 to the monitor.

While the pedestal is moving, the object and background image are played simultaneously.

After the gantry is moved, only the moving object is reproduced, at the same time only the moving object is reproduced, and at the same time the moving object is detected and the next gantry control signal 7 is generated.

Effects of the Invention As described above, according to the present invention, when a moving object occurs within the field of view using a pyroelectric camera, the image is captured in the continuous mode from start to finish, and the screen is directly captured from the output signal obtained. The center of gravity above the object is detected and the camera mount is driven to intermittently track and play back the object. By actively utilizing signals unique to the pyroelectric effect in this way, the complicated memory circuits and peripheral circuits used in the past are no longer required, and the circuit for extracting moving object signals is simplified, so the overall system The cost can be reduced. Furthermore, since the moving object image can be obtained without using a complicated circuit, the reliability of the follow-up operation can be improved. Furthermore, the addition speed can be increased.

[Brief explanation of the drawing]

The figure is a block circuit diagram showing a pyroelectric camera device according to an embodiment of the present invention. 1...Pyroelectric camera section, 2...Infrared light lens, 3.
... Pyroelectric two-dimensional sensor, 4... Camera rotation mount drive unit.

Claims (1)

[Claims] A pyroelectric camera section having a pyroelectric two-dimensional sensor, a camera rotation mount drive section, and the barycenter coordinates of the signal for the entire screen directly from the image signal in the panning mode reproduced using the above-mentioned pyroelectric two-dimensional sensor. is determined, and a gantry control signal proportional to the deviation from a predetermined reference point on the screen is output to the camera rotating gantry driving section, which changes the orientation of the pyroelectric camera section and moves the center of gravity of the reproduced image to the reference point. and a means for moving the camera, and intermittently repeating the signal processing and camera driving,
A pyroelectric camera device characterized by being configured to constantly track and reproduce an infrared image during panning mode.