JPH0814849B2 - Motion detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an object detection device for extracting a motion of an object in, for example, video image processing.

[Outline of Invention]

The present invention relates to a moving body detection apparatus, processing input data to extract data of a fixed pattern, and obtaining a moving body data by extracting a difference between the extracted data and the input data, whereby the moving body is detected in an original image. , Which enables good detection of a moving object.

[Conventional technology]

For example, when detecting the movement of an object in image processing, conventionally, for example, the difference between two time-series data is detected.

However, with this method, only the contour of the moving body can be obtained, and the contour in the traveling direction of the moving body is thick and the contour in the direction perpendicular to it is thin, and it is difficult to supplement the accurate image of the moving body. It was

By the way, the applicant of the present application has previously proposed a digital signal processing device (see Japanese Patent Laid-Open No. 58-215813) applicable to video image processing.

That is, FIG. 2 explains the outline of the apparatus,
In the figure, (21) is the input terminal, (22) is the input / output control (IO
C) system, (23) is an input image memory (VIM) system, (24) is a signal processing (PIP) system, (25) is an address generation (PVP) system,
(26) is the output image memory (VIM) system, (27) is the main control (T
C) system, (28) is an output terminal.

In this device, an input terminal (21) is supplied with an analog video signal from a video camera (not shown) or the like. This video signal is supplied to the IOC system (22) and converted into predetermined digital data by AD conversion or the like, and the VIM system (2
Written in 3). In addition to digital data, signals for controlling the VIM system (23) are supplied from the outside of the IOC system (22) such as clocks, control mode signals, addresses, and write control signals.

In addition, the VIM system (23) has a digital data address to be processed from the PVP system (25), a write control, a read mode,
A signal for controlling the VIM system (23) is supplied from the inside of data select or the like, and the data of this address is transferred to the PIP system (24) and processed. Furthermore PIP system (24)
The data processed by the VIM system (26) is supplied to this VIM system.
Addresses and the like from the PVP system (25) are supplied to the system (26). The processed digital data is written to the VIM system (26).

Further, the VIM system (26) is also supplied with an address and the like from the IOC system (22), whereby the read digital data is supplied to the IOC system (22) and converted into a predetermined analog video signal by DA conversion or the like. It is converted and taken out to the output terminal (28).

The TC system (27) supplies a designation signal such as a mode and system, a clock signal, etc. to each system (22) to (26).

Further, the start signal of the frame to be processed is supplied from the IOC system (22) to the PVP system (25), and the IVP system (25) starts the IOC.
A processing end signal is supplied to the system (22).

In this way, the video signal supplied to the input terminal (21) is digitally processed and taken out to the output terminal (28). According to the above-mentioned device, the functions required for processing are provided in each system. (22) ~ (26), each system (22) ~
Since a control circuit can be provided independently for each (26) and control can be performed by independent microprograms, the load on software for each system is small and high-speed processing can be performed with a simple program. This makes it possible, for example, to process video signals in real time.

By the way, in the above-mentioned device, the contents of the process are PIP (2
Determined by the microprogram such as 4). Therefore, the contents of the processing can be changed by rewriting these microprograms.

That is, FIG. 3 shows a specific configuration of the PIP system (24). The PIP system (24) is actually formed by arranging a large number (for example, 60) of processor units (30) in parallel. However, in the figure, only two of them (30a) and (30b) are shown. In this figure, the digital data from the VIM system (23) or (26) is the processor unit (30a) (30b).
..Input registers (FRA) (31a) (31 provided for each
b) ... and these registers are PVP
The system (25) controls the read addresses of the VIM systems (23) and (26) according to the read addresses, and stores a predetermined amount of data required for each processor unit.

The data written in these registers (31a) (31b)... Are calculated by the operation units (32a) (33a), (32b) (33
b) is supplied to. Each of these arithmetic units is provided with an adder / subtractor, a multiplier, a coefficient memory, and a data memory, and performs linear and non-linear data conversion arithmetic operations according to control signals from the control units (34a) (34b).
Further, this calculation result is obtained by the calculation units (33a) (33b) ..., and these calculation units (33a) (33b) ..
Is controlled according to the write address of the VIM system (23) (26), and the operation result is written in the desired portion of the VIM system (23) (26).

In this case, the control signals from the control units (34a) (34b)... Are stored in the microprogram memory (MPM) (35a).
(35b) are formed in accordance with the microprogram written in. Therefore, the MPMs (35a) (35b) ... Have a so-called PAM structure, and a microprogram from the outside is written into the MPMs (35a) (35b) ... through the change units (36a) (36b). As a result, the contents of the processing can be changed by rewriting the microprogram.

 The inventor of the present application pays attention to this point.

[Problems to be solved by the invention]

The above-described conventional technique has a problem that only the contour of the moving body can be obtained, and an accurate image of the moving body cannot be supplemented.

[Means for solving problems]

According to the present invention, the coefficient storage means (2) for outputting the coefficient A and the coefficient B and the coefficient A in the input image data (FRA (31)) are used.
A first multiplication means (1A) for multiplying and outputting
Adding means (4) for adding the output signal of the multiplying means and the output signal of the second multiplying means (1B), a storing means (3) for storing the output signal of the adding means, and the input image data. And a difference output means (5) for outputting a difference signal of the output signal of the storage means, wherein the second multiplication means multiplies the output signal of the storage means by the coefficient B and supplies it to the addition means. Thus, the relationship between the value a of the coefficient A and the value b of the coefficient B stored in the coefficient storage means is a
The moving object detecting device is characterized by being selected so that + b = 1.

[Action]

According to this, since the fixed pattern in the input data is extracted and the difference between the fixed pattern and the input data is obtained, the image of the moving object can be detected as it is, and good moving object detection can be performed. it can.

〔Example〕

Figure 1 shows a PIP system (24) for realizing the device of the present application.
3 shows functional blocks of a processing processor section (30) in FIG.

In the figure, the input data Xn from the FRA (31) is supplied to the multiplier (1A), and the weighting coefficient A from the coefficient memory (2) is supplied.
And the accumulated data Yn _-1 from the data memory (3) is supplied to the multiplier (1B), which is also multiplied by the weighting coefficient B from the coefficient memory (2). Further, the signals from the multipliers (1A) and (1B) are supplied to the adder (4), and the added data is written in the data memory (3). The above weighting factors A and B are A + B = 1.

As a result, the addition data Yn newly written in the data memory (3) becomes Yn = AXn + BYn ₋₁ , and this data Yn is further fielded back to the multiplier (1B) as cumulative data, and this is repeated. The displacement pattern in the input data Xn is removed, and only the fixed pattern is extracted.

That is, in the above, the input data Xn and the cumulative data Yn
A + B = 1 for the part that does not change between _-1 and _-1 (fixed pattern)
Therefore, the same value is used as the next cumulative data Yn. Change to this (fixed pattern-displacement pattern)
The portion that has been attenuated is attenuated at the ratio of the weighting factors A and B to be the next accumulated data Yn, and this displacement pattern is further attenuated according to the time ratio of the pattern to the accumulated time. As a result, the fixed pattern in the input data Xn is extracted. This fixed pattern corresponds to the background data Y in the input data Xn.

Then, the extracted fixed pattern data is further supplied to the difference circuit (5), and the difference from the input data Xn from the FRA (31) is taken out. This difference data is supplied to the VIM system (23) (26) as output data.

Therefore, in this device, the fixed background data Y is subtracted from the input data Xn, and the difference circuit (5)
From the data of moving object pattern Zn (= Xn-
Only Y) is taken out and the others are set to 0.

In this way, the moving body is detected, but according to the above-described device, the moving body can be detected not only as its contour but also as an object, so that an image of the moving body can be accurately obtained, and the moving body can be detected satisfactorily. it can.

In the above example, the extraction of the fixed pattern (background) is performed by weighting and adding the input data and the accumulated data. As described above, a constant may be added or subtracted according to the magnitude of the input data and the accumulated data, and another fixed pattern extraction method may be adopted.

〔The invention's effect〕

According to the present invention, the fixed pattern in the input data is extracted, and the difference between the fixed pattern and the input data is obtained. Therefore, the image of the moving object can be detected as it is, and good moving object detection can be performed. Is now possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of the present invention, and FIGS. 2 and 3 are diagrams for explaining a conventional technique. (1A) and (1B) are multipliers, (2) is a coefficient memory, (3) is a data memory, (4) is an adder, and (5) is a difference circuit.

Claims (1)

[Claims] 1. A coefficient storing means for outputting a coefficient A and a coefficient B, a first multiplying means for multiplying input image data by the coefficient A and outputting the same, an output signal of the first multiplying means and a second.
The addition means for adding the output signal of the multiplication means, the storage means for storing the output signal of the addition means, and the difference output means for outputting the difference signal between the input image data and the output signal of the storage means. The second multiplication means multiplies the output signal of the storage means by the coefficient B and supplies the result to the addition means. The value a of the coefficient A stored in the coefficient storage means and the value a of the coefficient A stored in the coefficient storage means. A moving object detecting device, wherein the relationship of the value b of the coefficient B is selected so that a + b = 1.