JPH09285458A - Centroid oscillation analyzer and method for calculating oscillation outer peripheral area therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and accurately calculate an oscillation outer peripheral area without using an excessive memory (VRAM plane) for an operation. SOLUTION: A data processor 4 is provided with an initialization means 41, an addition means 42 and in outer peripheral area calculation means 43. A start point for tracking the outer periphery of an oscillation area and the initial value of a tracking direction are obtained by the initilization means 41, the integration of an area is performed in the addition means 42 while tracking the outer periphery of the oscillation area by the initialization means 41 and the oscillation outer peripheral area is calculated from the area integrated in the addition means 42 and outputted to an output device 5 in the outer peripheral area calculation means 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center-of-gravity motion analyzer, and more particularly, to a method of calculating a motion outer peripheral area which indicates a variation region of the center-of-gravity position of a subject.

[0002]

2. Description of the Related Art In otolaryngology, ophthalmology, neurology, etc., it is practiced to diagnose a subject by analyzing the swaying state of the center of gravity of a human in an upright position. The shaking outer peripheral area is one of the important indexes in this diagnosis. The agitation outer peripheral area is the area of the smallest region that includes the entire trajectory when the agitation of the subject's center of gravity position is projected on a horizontal plane.

FIG. 5 is a block diagram showing an example of a center-of-gravity sway analysis apparatus based on a conventional sway outer peripheral area calculation method.

This conventional center-of-gravity sway analysis apparatus includes a center-of-gravity sway meter 1, a center-of-gravity position detection device 2, a VRAM 3, a graphic display controller 7, a data processing device 6 operated by program control, and an output device 5. The data processing device 6 is configured to include the first filling unit 6
1, second filling means 62, and bit search means 6
3 and an outer peripheral area calculation means 64.

The signal output from the center of gravity sway meter 1 is processed by the center of gravity position detecting device 2, converted into x, y coordinate values, and converted into V.
It is plotted in RAM3. This is repeated a certain number of times to form a center of gravity sway miracle.

After this process is completed, a process for calculating the shaking outer peripheral area is performed. First, the first filling means 6
The drawing color of the center of gravity miracle (color 1) is set as the boundary color at 1 and the outside of this is filled with color 2. Next, the second filling means 6
In 2 the color 2 is used as the boundary color and the inside is filled with the color 3. These processes are performed via the graphic display controller 7.

Then, the bit search means 63 counts the number of pixels in the area filled with the color 3. This processing is also performed via the graphic display controller 7. The bit search means 63 scans the VRAM plane line by line in the X direction, and counts the number of pixels on one line from the difference between the X coordinate values of two points that are the boundaries of color 2 and color 3, which is the total Y coordinate. And the number of pixels in the area filled with color 3 is finally obtained.

Finally, the outer peripheral area calculating means 64 multiplies the number of pixels by the area per pixel to calculate the shaking outer peripheral area, and outputs it to the output device 5.

[0009]

The first problem is that the accuracy of the calculated wobbling outer peripheral area is poor.

The reason is that since the wobbling outer peripheral area is calculated based on the number of pixels on the VRAM, about 1/2 of the area of the outer peripheral pixel is added.

The second problem is that an extra VRAM plane is required.

The reason for this is that when the bit search function of the graphic display controller is used, it is necessary to perform the filling processing with the boundary color twice as a preprocessing.
At this time, since three border colors are required, at least two VRAM planes are required in addition to the VRAM plane for drawing the trajectory.

The third problem is that the processing speed is slow.

The reason is that when the bit search function of the graphic display controller is used, it is necessary to scan the entire VRAM plane even if the drawing area of the motion locus is a narrow range. This is because processing is required.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to quickly and accurately calculate a sway outer peripheral area in a center-of-gravity sway analysis apparatus without using an extra working memory (VRAM plane).

Therefore, the center-of-gravity sway analysis apparatus of the present invention is
Initialization means (41 in FIG. 1) for obtaining a starting point for tracking the outer circumference of the sway region and an initial value of the tracking direction;
An adding means (42 in FIG. 1) for integrating the area while tracking the outer circumference of the shaking region by this initialization means, and an outer peripheral area calculating means (FIG. 1) for calculating the shaking outer peripheral area from the area integrated by the adding means. 43) and a data processing device.

The method of calculating the sway outer peripheral area in the center-of-gravity sway analysis apparatus of the present invention is to obtain the tracking start point coordinates of the outer sway of the sway region and set the initial value of the tracking direction vector which is a vector indicating the direction of the tracking. A point moved by the tracking direction vector from the tracking start point is set as a tracking next candidate point which is a next candidate for outer circumference tracking of the shaking area, and when this point is on the outer circumference of the shaking area, this is set as the next tracking point, The tracking next candidate point is determined and the area is integrated, and the tracking next candidate point is determined. If this is not the next tracking point, that is, if it is not on the outer periphery of the sway region, the tracking direction vector is set to one step in the update direction. If the next tracking point is the next tracking point, the area is integrated from the coordinates of the tracking starting point and the next tracking point, and then the next tracking point is set as the tracking starting point. , The trace direction vector is set again, the above processing is repeated over the entire outer circumference of the shaking region, the accumulated area is multiplied by the area corresponding to one pixel of VRAM to calculate the shaking outer peripheral area, and the result is output to the output device. It is characterized by doing.

[0018]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a center-of-gravity sway analysis apparatus according to the method of calculating a sway outer circumference area of the present invention, FIG. 2 is a flow chart for explaining the operation of the center-of-gravity sway analysis apparatus of FIG. 1, and FIG. FIG. 3 is a diagram for explaining the tracking direction vector of FIG. 2.

In FIG. 1, the center-of-gravity analysis device of this embodiment comprises a center-of-gravity sway meter 1, a center-of-gravity position detector 2, and
It is composed of a VRAM 3, a data processing device 4 that operates under program control, and an output device 5. The data processing device 4 includes an initialization unit 41, an addition unit 42, and an outer peripheral area calculation unit 43.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS.

The signal output from the center-of-gravity swaymeter 1 is processed by the center-of-gravity position detecting device 2, converted into x, y coordinate values, and V
It is plotted in RAM3. This is repeated a certain number of times to form a center of gravity sway miracle.

After this process is completed, a process for calculating the shaking outer peripheral area is performed.

Here, x ₁ and y _{1 in} FIG. 2 are x coordinates and y coordinates of the tracking start point, dx and dy are x component and y component of the tracking direction vector, and x ₂ and y ₂ are respectively. The x-coordinate, y-coordinate, and A of the next tracking point are integrated values of the shaking outer peripheral area in units of 1 pixel of the VRAM.

First, the initializing means 41 of FIG. 1 obtains the coordinates of the tracking start point on the outer periphery of the shaking area, and further sets the initial value of the vector indicating the direction of tracking (tracking direction vector) (see FIG. 2). Steps S1 and S2). The tracking direction vector can take eight directions shown in FIG. Further, the point moved by the tracking direction vector from the tracking start point becomes the next candidate for the outer circumference tracking of the shaking region. This will be referred to as a "following tracking candidate point". Further, when this point is on the outer circumference of the sway region, this is called a "next tracking point".

The adding means 42 determines the tracking next candidate point and integrates the area. The area here is VRAM
Is an area in units of 1 pixel. First, the tracking next candidate point is determined, and if it is not the next tracking point, that is, if it is not on the outer periphery of the sway region, the tracking direction vector is updated by one step in the update direction shown in FIG. The determination is repeated (steps S3 and S4).
If the next tracking point is the next tracking point, the area is integrated from the coordinate values of the tracking start point and the next tracking point (step S).
6). Next, the next tracking point is set as the tracking starting point (step S
7) Reset the tracking direction vector (step S
8) The above process is repeated over the entire outer circumference of the shaking region (step S9).

The outer peripheral area calculating means 43 calculates the shaking outer peripheral area by multiplying the area integrated by the adding means 42 by the area corresponding to one pixel of the VRAM (step S1).
0), and outputs the result to the output device 5.

Next, a specific embodiment will be described with reference to the drawings.

FIG. 4 is a diagram showing the operation of an embodiment of the center-of-gravity motion analyzer of the present invention. For example, it is assumed that the wobbling outer peripheral area is calculated for the center-of-gravity wobbling trajectory illustrated in the VRAM 3.

The initializing means 41 shown in FIG. 1 determines the tracking start point coordinates to be (3, 5) (step S1 in FIG. 2) and the tracking direction vector to be (-1, 1) (step S2). .

The adding means 42 first determines the tracking next candidate point. The tracking next candidate point (2, 6) is determined not to be the next tracking point (step S3), and the tracking direction vector is updated (step S4). This process is repeated, and when the tracking direction vector is (1, 1), it is found that the tracking next candidate point is the next tracking point, and the coordinates of the next tracking point are (4,
6) is determined (step S5). Then, the area is integrated from the tracking start point coordinates (3, 5) and the next tracking point coordinates (4, 6) (step S6). Next, the tracking start point is updated to (4, 6) (step S7), and the tracking direction vector is reset to (-1, 0) (step S8).
Since tracking over the entire circumference of the shaking region has not been completed, the process returns to step S3 (step S9).

After the adding means 42 is completed, the outer peripheral area calculating means 43 calculates the shaking outer peripheral area (step S10).

[0033]

The first effect is that the accuracy of the calculated wobbling outer peripheral area is improved.

The reason is that the shaking outer peripheral area calculated by the present invention is not the number of pixels on the shaking area but the area of a polygon formed by connecting the center points of pixels corresponding to the outer circumference of the shaking area on the VRAM. This is because it has a precision equivalent to the resolution of VRAM.

The second effect is that an extra VRAM plane is not required in the process of calculating the shaking outer peripheral area.

The reason for this is that in the present invention, in the process of calculating the wobbling outer peripheral area, processing such as painting out which requires a plurality of VRAM planes is not performed.

The third effect is that the processing speed is improved.

The reason is that the function of the graphic display controller (filling and bit search function) is used.
This is because there is no useless processing because the is not used.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a center-of-gravity sway analysis apparatus by a method of calculating a sway outer peripheral area of the present invention.

FIG. 2 is a flow chart for explaining the operation of the center-of-gravity motion analysis device of FIG.

FIG. 3 is a diagram for explaining a tracking direction vector of FIG.

FIG. 4 is a diagram showing the operation of an embodiment of the center-of-gravity sway analysis apparatus of the present invention.

FIG. 5 is a block diagram showing an example of a center-of-gravity sway analysis apparatus by a conventional method of calculating a sway outer peripheral area.

[Explanation of symbols]

 1 barycenter swayometer 2 barycentric position detection device 3 VRAM 4 data processing device 41 initialization means 42 addition means 43 outer peripheral area calculation means 5 output device 6 data processing device 61 first filling means 62 second filling means 63 bit search means 64 Peripheral area calculating means 7 Graphic display controller

Claims (2)

[Claims] 1. Initializing means for obtaining an initial value of a starting point for tracking the outer periphery of a motion region and a tracking direction,
A data processing device comprising an adding means for integrating the areas while tracking the outer circumference of the shaking area by the initialization means, and an outer peripheral area calculating means for calculating the shaking outer peripheral area from the area integrated by the adding means. A center of gravity motion analyzer characterized by. 2. The tracking start point coordinates of the outer periphery of the sway area are calculated,
The initial value of the tracking direction vector, which is the vector indicating the tracking direction, is set, and the point moved by the tracking direction vector from the tracking start point is set as the tracking next candidate point that is the next candidate for the outer circumference tracking of the sway area. If the point is on the outer circumference of the sway region, this is set as the next tracking point, the tracking next candidate point is determined and the area is integrated, the tracking next candidate point is determined, and this is not the next tracking point. In other words, if it is not on the outer periphery of the sway region, the tracking direction vector is updated by one step in the update direction, the determination of the tracking next candidate point is repeated, and if the tracking next candidate point is the next tracking point, the tracking start point and the next tracking point are determined. The area is integrated from the coordinate values of the points, then the next tracking point is set as the tracking start point, the tracking direction vector is set again, and the above processing is repeated over the entire outer circumference of the shaking region. Calculation of upset outer peripheral area of body sway analysis apparatus characterized by calculating the upset periphery area over the area corresponding to one pixel, and outputs the result to the output device of the VRAM (video random access memory) to.