JPS5983079A - Object detector - Google Patents

Abstract

PURPOSE:To not only merely detect the presence and the passage of objective matter but also to separate said objective matter from the background thereof to enable the detection of the shape thereof, by consisting the titled detector of a unidimensional photoelectric detector, image memory, a comparison means and an image treatment apparatus. CONSTITUTION:The desired number of image signals obtained by a unidimensional photoelectric detector 1 are stored in image memory 2 and the different images stored in the image memory 2 at separate time are compared by a comparator 3 which in turn outputs only the different parts of the compared images. The outputs from the comparator 3 are subjected to necessary treatment in an image treatment apparatus 4 and an objective moving matter is detected and recognized. The series of above mentioned treatments are performed while controlled by a control circuit 5 and only the objective moving matter is separated from the background figure thereof by the apparatus having the above mentioned constitution to make it possible to perform the detection and recognition of the moving object.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a technique for detecting a moving object.
“v” relates to technology for detecting a target object without contact.

Automation technology in various industrial fields uses various non-contact detection technologies for moving objects. (e.g. placed on a moving conveyor)
Also, this is a very simple example of detecting the passage of a box using a photoelectric switch and controlling the moving speed of the box. In addition, if the detection content is complex, the target object may be imaged with a camera, video processing and video processing may be performed, and one-time detection of the target object may be performed. However, in the former case, the conventional method of Jl et al. only detects the presence or passage of the object, but cannot detect it due to its shape. It is difficult to separate it from the background, and it has the disadvantage that it requires a huge amount of processing equipment.

Objective V of the present invention is to provide an object detector that eliminates the drawbacks of the prior art described above.

In view of this purpose, the present invention provides a one-dimensional (1D)'Cton detector consisting of a plurality of photoelectric conversion elements arranged one-dimensionally, and a scanning image (f?) from the photoelectric detector. ``a means for storing the name of a spouse; and a comparison means for comparing two J-dimensional images at time n of the one-dimensional images obtained from the memory or the one-dimensional one ITIl image obtained from the photoelectric detector. , a detection means for detecting a moving object by performing necessary processing on the output from the comparison means and an object detector.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention, and FIG. 2 is a diagram explaining the operation J6.

In FIG. 1, l is a one-dimensional light weight, a detector, 2 is an image memory, 3 is a comparator, 4 is an image processing device, and 5
is the control circuit.

The required number of image signals obtained by the one-dimensional photoelectric detector are stored in the image data memory 2. Ru. The images stored in the image memory 2 at different times are stored in the comparator 3.
This comparator 3 outputs only the different parts of the compared images. The output from the comparator 3 is processed by the image processing device 4, and the target moving object is detected or recognized.

The above series of processing is performed under the control of the control circuit 151C, and the above-described winding device cuts out only the target moving object from the background figure, and the moving object can be detected and recognized. Figure 2 illustrates a falling object in a uniform background.

In FIG. 2(a), 6 is a falling object, 7 is a background pattern, and 8 is a field of view of a one-dimensional photodetector. The figure shows object 6
The falling state is shown at time T=tt, and the second degree is
...is indicated by a circle. At this time, position 1 of object 6
1 moves over time, but the background figure 7 does not change.
. . . shows the signal waveform obtained from the one-dimensional photoelectric detector.

For example, at time T=t+, a graphic signal is obtained at the location where the field of view of the photoelectric detector and the background graphic intersect. Also,
In T=(2, the falling object signal is superimposed on the background figure signal.

FIG. 2(C) is a diagram showing the basic principle of the present invention, and T
The signal waveform described at ='n is 1 of T=tn.
The waveform of T=tn-1 is removed from the waveform of l=i7. In this FIG. 2(C), the background figure signal is erased in the seventh figure because the four figures on the back J do not change due to the time change K. That is, in FIG. 2(C), only the changes in the waveforms ll: and ji are extracted, and the stiffness is a signal obtained only from the falling object 6.

By performing necessary processing on the signal waveform obtained from FIG. 2(C) using existing video processing technology, it is possible to easily detect the presence or absence, size, shape, etc. of a falling object.

In addition, in the explanation of FIG. 1 above, it was explained that the image in the image memory 2 is used as the image to be compared, but one of the images may be obtained from a one-dimensional photoelectric detector. .

Further, as the video signal, not only the intensity signal of light but also color information may be used. In this way, color information, etc., multi-value 1#
More detailed information can be obtained by using the information. Even in this case,
By comparison, stationary object information such as a background image can be completely erased.

Further, the background information does not need to be completely stationary; it is only necessary that the background information be almost stationary with respect to the time difference between the figures to be compared. Therefore, even when the present invention is implemented outdoors, for example, the functions of the present invention can be exerted without being affected by gradual changes in the background graphic signal due to gradual changes in brightness.

As described above, according to the present invention, there is provided a one-dimensional photoelectric detector including a plurality of front-element conversion elements arranged one-dimensionally, a means for storing a scanned image signal from the photoelectric detector, and a means for storing a scanned image signal from the photoelectric detector; a comparison means for comparing two one-dimensional images including time among the one-dimensional images or the one-dimensional images obtained from the photoelectric detector; and a comparison means for performing necessary processing on the output from the comparison means to detect a moving object. By configuring an object detector with a detection means, it is possible not only to detect the presence of an object or its presence, but also to separate the target object from its background and detect its shape. It is played. However, the advantage is that the processing equipment needed is compact.

[Brief explanation of the drawing]

tn1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is a diagram explaining the operating principle of the present invention. 1... One-dimensional) electric detector 2... Image memory 3... Comparator 4... Image processing device 5.
... system? , '+71 circuit applicant NEC Corporation

Claims (1)

[Claims] 1 consisting of a plurality of light weight 4 conversion elements arranged in one dimension
a dimensional photogravitational detector; a means for storing a scanned video signal from the photoelectric detector;
An object detector comprising a comparing means for comparing two one-dimensional images, and a detecting means for detecting a moving object by performing necessary processing on the output from the comparing means.