JPH05312517A - Motion analyzer for a part of specimen - Google Patents

Abstract

PURPOSE:To realize highly efficient and accurate analysis by marking a target with a combination of a plurality of colors thereby increasing the number of recognisable targets. CONSTITUTION:Color marks for a target 1 to be fixed to a part of a specimen is constituted of a combination of a plurality of colors. For example, the target 1 is constituted of yellow part and red part. Signals are then subjected to A-D conversion for every frame through a video board 4 while photographing the movement of body by means of two television cameras 21, 22 and the signals thus converted are classified according to the color and recorded in yellow and red boards in the cores 51, 52. Furthermore, a computor 6 performs calculation of three-dimensional coordinates of the target 1 classified according to the color and records the image in a recording medium such as a video television recorder 7 or a hard disc 8. A cathod ray tube 61 confirms each measured state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion analysis apparatus for a non-analyte part which detects and analyzes a movement locus of the motion of a to-be-analyzed part two-dimensionally or three-dimensionally at high speed in a non-contact state.

[0002]

2. Description of the Related Art Individual targets are color-marked and attached to a measurement target portion, and these color targets are
A video board for each screen (field or frame) of only the information signals of the color and shape of the marker through a video television recorder for monitoring while photographing the movement of the body from a plurality of units, for example, a video camera. The applicant of the present invention has a motion analysis device that extracts a motion of the object to be measured to obtain a two-dimensional or three-dimensional (two or more cameras) movement of the measurement target region by calculating the barycentric coordinates. It was previously proposed in Japanese Patent Application No. 2-211013.

FIG. 3 is an explanatory diagram of the operation of a conventional motion analysis apparatus of this type, and FIG. 3A is an explanatory diagram relating to color difference data,
(B) is an explanatory diagram regarding luminance data, and color image data of a marker captured by a video camera or the like is usually separated and stored in an electric circuit into luminance data (b) and color difference data (a). .. However, general room lighting is 3
The color data of a marker or the like captured by a video camera or the like is about 00 to 600 lux, and in fact, greatly depends on the environment of the brightness at that moment. Therefore, the color data value recognized by the video camera or the like changes as the environment changes. For example, the data value of red when the surrounding area is bright and red when the area is dark differ considerably even if the same marker is red.

Therefore, in the case of recognizing individual markers by color in a normal environment, the color data recognized by the teaching before measurement is changed depending on the surrounding environment, which changes from moment to moment. Often not useful for discrimination.

In order to solve the above-mentioned problems, a method of shining a strong light is usually used to keep the environment constant, but when a measurement object is a human, it is dazzling and unbearable. Therefore, it is conceivable to give the brightness data (b) and the color difference data (a) a certain width so as to be able to follow some changes in the surrounding environment, but if the width is made too large, , Reduction in the number of colors that can be extracted (the size of the width, that is, the sum of the areas for recognizing that color is the circle area (the shaded area in the frame) of the color difference data (a) in FIG. If the area of the data is smaller, more colors can be recognized), or it is recognized as a color mark of the surrounding environment, which causes an error. Further, there is a problem that if the data area becomes small, it cannot be extracted depending on the surrounding environment.

Therefore, the applicant of the present invention calculates the average value of the color difference data for each moving coordinate from the color difference data of the color-marked target, and the average value at the n-th coordinate is the n-th.
If the target is within the color difference data range of one coordinate, it is determined that the target has the same color, and a motion analysis device that analyzes the motion of the subject site is proposed and filed.

[0007]

In the apparatus according to this proposal, the number of colors that fall within the set color difference range (hue circle) is at most 10 and so, the number of detectable targets is 10 and more. It turns out that. However, under the present circumstances, it is required to analyze the movement loci of a large number of targets attached to each object part, and to analyze the complex motion of the object part comprehensively or in a correlated manner. It is necessary to increase the number.

The present invention has been made in view of the current state of the above-described motion analysis apparatus of the type described above, and its purpose is to analyze the motion of an object part capable of increasing the number of detectable targets. To provide a device.

[0009]

In order to solve the above-mentioned problems, the present invention attaches a color-marked target having a predetermined area to a subject site, and shows the movement locus of the target accompanying the movement of the subject site. In the motion analysis apparatus for the body part of a subject, which traces and shoots with at least one TV camera, calculates image data for each moving coordinate and analyzes the motion of the body part, the target is a combination of a plurality of colors. It has a color-marked structure.

[0010]

With such a structure, in the present invention, the target is color-marked with a combination of a plurality of colors, and the number of colors is N.
By selecting and combining M colors from these N colors, N! / M!・ (NM)! Types of targets can be detected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a block diagram showing the configuration of the embodiment, and FIG. 2 is an explanatory diagram showing the operation of the embodiment.

In the embodiment, as shown in FIG. 1, the individual color-marked targets 1 are attached to the measurement target parts of each part of the body (only one position is shown in the drawing).

First, each target 1 is monitored by one to a plurality of television cameras 2 ₁ , 2 ₂ (however, in the case of a flat surface, _one camera may be used) while photographing the movement of the body. The information signal for each target is identified for each color via the video television recorders 3 ₁ , 3 ₂ for use as a color image. However, the color data such as the marks captured by the video cameras 2 ₁ , 2 ₂ are actually , At that moment, depends largely on the environment of the brightness of that moment. Therefore, the color data recognized by the teaching before measurement often changes from moment to moment and becomes useless depending on the surrounding environment.

Therefore, in the present invention, for example, when the target 1 to be attached to the subject site near the knee is formed into a color mark, the color mark is constituted by a combination of a plurality of colors, and in the embodiment, the target 1 is yellow (Y). )
It is composed of two colors, a part and a red (R) part. And
The color-marked target 1 is attached to the measurement target portion of each part of the body (only one place is shown in the figure). And while shooting the movements of the body with the two TV cameras 2 ₁ and 2 ₂ (however, in the case of a plane, _one camera is enough)
The information signal is subjected to A / D conversion by the video board 4 for each frame through the video television recorders 3 ₁ and 3 ₂ for monitors, and the signal is selected for each color of the target 1, and the cores are respectively selected. Yellow (Y) in 5 ₁ , 5 ₂
And record on each red (R) board. Further, the computer 6 performs calculation while measuring the three-dimensional coordinate calculation of the target 1 selected for each color by the core 5, and at the same time, records an image on a recording medium such as the video television recorder 7 or the hard disk 8. deep. The 6 ₁ shows a cathode-ray tube, to make sure that from time to time of the measurement state in the eye. Also,
It is also possible to compare it with the past calculation state.

Further, if the shape can be selected by the core and the shape of the marker is changed variously, the accuracy of the motion analysis can be increased and high-speed processing can be performed.

As shown in FIG. 2, the target 1 attached to the subject site moves as the subject site moves,
As the color difference data, a yellow (Y) data area A1 and a red (R) data area B1 are measured at the initial movement coordinates. Then, in the next moving coordinate, the yellow (Y) data area shifts to A2, and the red (R) data area moves to B2.
Move to. As described above, in the embodiment, even if the color data of the target 1 captured by the television camera changes according to the environmental conditions, the two colors of yellow (Y) and red (R) are measured as a paired combination. It is not necessary to widen the color difference data area in order to deal with the change in the environmental conditions, and the number of detectable targets can be increased.

Generally, the number m of combinations for selecting M kinds of colors from N kinds of colors is m = N! / M!・ (NM)! Therefore, for example, if N = 6 and M = 2 and two colors are selected from six colors to make a combination, m = 6! / 2!・ (6-
2)! = 15, and if you add a single color target, it becomes 21
Individual targets can be identified. Furthermore, N = 6,
If M = 3, then m = 20 and only two color combinations yield 2
It is possible to identify 0 targets.

[0018]

As described in detail above, according to the present invention, a color-marked target having a predetermined area is attached to a subject region, and at least one target movement locus accompanying the movement of the subject region is set. In a motion analysis apparatus for a subject region that performs tracking and shooting with a television camera of No. 1 and calculates shooting data for each moving coordinate to analyze the motion of the subject region, the target is color-marked with a combination of a plurality of colors. Therefore, it is possible to increase the number of identifiable targets and efficiently and accurately analyze the operation of a complicated subject part.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the embodiment of the present invention,
(A) is an explanatory view of color difference data, and (b) is an explanatory view of luminance data of (a).

3A and 3B are explanatory views of the operation of the conventional operation analysis apparatus of this type, where FIG. 3A is an explanatory view regarding color difference data, and FIG. 3B is an explanatory view regarding luminance data in FIG. 3A.

[Explanation of symbols]

 1 Target 2-1, 2-2 TV Camera 3-1 3-2 Video TV Recorder 4 Video Board 5-1 5-2 Core 6 Computer 7 Video TV Recorder 8 Hard Disk

Claims (1)

[Claims] 1. A color-marked target having a predetermined area is attached to a subject site, and a moving locus of the target accompanying movement of the subject site is tracked and photographed by at least one television camera, and each moving coordinate is measured. In the motion analysis apparatus of the subject part for calculating the imaging data of and analyzing the action of the subject part, the target is color-marked with a combination of a plurality of colors of the subject part. Motion analysis device.