JPH0935048A - Mobile object detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile object detecting device which utilizes image processing. SOLUTION: An image from a TV camera 1 is digitized by an A/D conversion part 3 and then binarized into a binary image. Here, an image obtained in the absence of a mobile object is stored as a reference binary image in a binary image memory 5 and the binary image is compared, pixel by pixel, with the reference binary image in real time by frames to count discrepant pixels, and the count value is compared with a predetermined reference pixel number, so when the mobile object is present, the number of discrepant pixels exceeds the reference pixel number, so the mobile object can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detecting a moving object, and more particularly to detecting a moving object by processing an image from a TV camera using image processing.

[0002]

2. Description of the Related Art Conventionally, a photoelectric switch is often used as a sensor for detecting a moving object. This photoelectric switch consists of a light emitting part and a light receiving part.When a moving object is not in the detection area, the light receiving part always receives the light from the light emitting part. The light is blocked, the light is not detected by the light receiving unit, and the passage of a moving object is detected.

[0003]

However, such a photoelectric switch is used to detect a moving object, and an image from a TV camera is image-processed by using it as a trigger to recognize the moving object and monitor it. In some cases, even if this image processing is used, it is possible to detect a moving object, and there is a drawback that the functions are duplicated and the cost is increased. The present invention has been made to solve the above-mentioned problems.
It is an object of the present invention to provide a moving object detection device using image processing of an image from a V camera.

[0004]

According to the present invention, a TV camera for capturing a moving object as an image and generating a composite image signal, and an A / D for A / D converting an image signal portion of the composite image signal from the TV camera. A binarization processing unit that binarizes the digital image from the conversion unit and the A / D conversion unit to form a binary image, and a binary image when there is no moving object from the binarization processing unit. A binary image memory to be stored as a reference binary image and a binary image from the binarization processing unit based on the reference binary image stored in the binary image memory are compared in real time on a pixel-by-pixel basis for each pixel. A timing signal for writing / reading a binary image to / from the binary image memory is calculated from a composite image signal from the comparison / determination unit that counts the number of pixels that do not match and compares the magnitude with a predetermined reference pixel number and the TV camera. Generate And a timing generation unit.

[0005]

According to the present invention, the image from the TV camera is binarized, and the image when no moving object is present is stored as a reference binary image in the binary image memory. Since it was decided to compare the binary image input from the TV camera and binarized in real time for each frame on a pixel-by-pixel basis to count the number of unmatched pixels, and to compare it with a predetermined reference pixel number, it was moved. If there is an object, the number of pixels that do not match exceeds the reference number of pixels, so that a moving object can be detected.

[0006]

1 is a block diagram of a moving object detecting device using a camera according to an embodiment of the present invention. The present apparatus includes a TV camera 1, a timing signal generation unit 2 that generates various timing signals for memory control from a composite image signal from the TV camera 1, and an A / D converter that A / D-converts an image portion of the composite image signal. A conversion unit 3, a binarization processing unit 4 that performs binarization processing according to a specified threshold value, a binary image memory 5 that stores an image that has been binarized, and a binary image from the binary image memory. The binary images from the conversion processing unit 4 are compared in real time on a pixel-by-pixel basis on a frame-by-frame basis to count the number of unmatched pixels, and a predetermined fixed pixel count is used as a reference to determine whether or not the reference pixel count is exceeded. It is composed of a comparison / determination unit 6 for determination.

Next, the operation of such a moving object detecting device will be described. The TV camera 1 constantly photographs the detection area, and the composite image signal from the TV camera 1 is output to the timing signal generation unit 2 and the A / D conversion unit 3. The timing signal generator 2 generates various timing signals for writing / reading a binary image in the binary image memory 5 from the composite image signal. The A / D conversion unit 3 converts the image portion of the composite image signal into a digital image and outputs the digital image to the binarization processing unit 4. The binarization processing unit 4 generates a binary image with the threshold value appropriately designated from an operation unit (not shown) as a boundary, and outputs the digital image to the binary image memory 5 and the comparison determination unit 6. The binary image memory 5 stores, as a reference binary image, a binary image when a moving object does not exist in the detection area from the operation unit under the timing signal from the timing signal generation unit 2. The comparison / determination unit 6 compares the reference binary image from the binary image memory 5 with the binary image output from the binarization processing unit 4 in real time on a pixel-by-frame basis and determines the number of unmatched pixels. The number is counted and compared with the reference pixel number that is appropriately designated by the operation unit, and when the number exceeds the reference pixel number, it is determined that a moving object is detected.

[0008]

According to the present invention, as described above,
Since the moving object can be detected by the number of unmatched pixels in each frame between the reference binary image when no moving object is present and the binary image continuously obtained from the TV camera and binarized, the detection result can be obtained. Can be used as a trigger for image recognition of a moving object, so that a separate moving object detecting device is not required and a low cost moving object detecting device can be configured.

[Brief description of drawings]

FIG. 1 is a block diagram of a moving object detection device using a camera according to an embodiment of the present invention.

[Explanation of symbols]

 1 TV camera 2 timing generation unit 3 A / D conversion unit 4 binarization processing unit 5 binary image memory 6 comparison determination unit

Claims (1)

[Claims] 1. A TV camera that captures a moving object as an image and generates a composite image signal, and an image signal portion of the composite image signal from the TV camera.
There is an A / D conversion unit that performs A / D conversion, a binarization processing unit that binarizes the digital image from the A / D conversion unit to form a binary image, and a moving object from the binarization processing unit. 2 when not
A binary image memory that stores a value image as a reference binary image, and a binary image from the binarization processing unit based on the reference binary image stored in the binary image memory, in real time, in pixel units for each frame. A binary image is written / read out to / from the binary image memory from the composite image signal from the comparison / determination unit that counts the number of pixels that do not match by comparison and compares the size with a predetermined reference pixel number. A moving object detection device, comprising: a timing generation unit that generates a timing signal.