JPH0650983A - Operation analyzer for specimen part - Google Patents

Abstract

PURPOSE:To obtain a data free from the brightness pertaining to movement utilized to restore functions of a subject by computing hue, chroma and lightness by a specified formula based on color signals of three primary colors of a target adapted to be a color mark. CONSTITUTION:A target 1 of a subject 3 is taken with TV cameras 4a and 4b. Both the cameras operate identically and hence, the camera 4b is used for explanation. R, G and B signals of a color image of the target 1 as obtained by photographing with the TV camera 4b are inputted into a video TV recorder 5. The recorder 5 performs an image processing of a brightness signal and a color-difference signal and the color image of the target 1 is displayed on a CRT 12 as monitor image. On the other hand, the R, G and B signals from the camera 4b are converted with an A/D converter 6 and a converter 7 computes a (R+G+B) signal, a (R+G) signal and a (R-B) signal to be outputted. The (R+G+B), (R-G) and (R-B) signals are inputted into an HSI converter 8. A converter 8 computes a hue signal H, a chroma signal S and a lightness signal I by the formulas I-III. A computer 10 calculates various data pertaining to a specimen 3 and displays the results on a CRT 12.

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

FIG. 2 is an explanatory view of the operation of a conventional motion analysis apparatus of this type, and FIG. 2 (a) is an explanatory view concerning 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 by an electric circuit into luminance data (b) and color difference data (a) and held. . 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 brightness environment 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 values of red when the surrounding area is bright and red when the surrounding 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 in which the color data changes momentarily. It is often useless for discrimination.

[0005]

In order to solve the above-mentioned problems, usually, a method of applying strong light to keep the environment constant is adopted, but when the measurement target is a human, I can't stand it because it's dazzling. Therefore, the brightness data (b) and the color difference data (a) have a certain width,
It may be possible to make it possible to follow some changes in the surrounding environment, but if you make the width too large, the number of colors that can be extracted will decrease (the size of the width, that is, to recognize that color). Since the sum of the areas is the circle area (the shaded area in the frame) of the color difference data (a) in FIG.
The smaller the area of each data is, the more color can be recognized), or the color is recognized as a color mark of the surrounding environment, which causes an error. In addition, there is a problem that if the data area becomes small, it cannot be extracted depending on the surrounding environment.

An object of the present invention is to detect the color mark of a target attached to the subject at each moving coordinate with a television camera and recognize the color mark. However, it does not become useful because it changes from moment to moment depending on the surrounding environment, and a color-marked target that is attached to a predetermined part of the subject and is color-marked is detected regardless of the ambient brightness and various stability is detected. An object of the present invention is to provide a motion analysis device capable of supplying the obtained data.

[0007]

In order to achieve the above-mentioned object, the present invention attaches a color-marked target having a predetermined area to a subject site, and at least the movement locus of the target accompanying the movement of the subject is described. In a motion analysis device for a subject region that performs tracking and shooting with one TV camera, calculates shooting data corresponding to measurement coordinates, and analyzes the action of the subject region, the three attributes of the color of the target are R, Hue H based on the G and B signals, H = tan
⁻¹ (G−B) / (2R−G−B), saturation S, S =
{(B−R) ² + (R−G) ² + (G−B) ² } / 3,
A detection calculation unit is provided for detecting and calculating the lightness I as I = R + G + B.

[0008]

With such a configuration, the hue of the moving locus of the target of a predetermined area, which is formed into a color mark and attached to the object site, which accompanies the operation of the object, is traced by at least one television camera when the image is tracked. H, H = ta
n ⁻¹ (G−B) / (2R−G−B), saturation S, S =
{(B−R) ² + (R−G) ² + (G−B) ² } / 3,
The brightness I is detected as I = R + G + B, and various data are calculated based on the detected value. For this,
The hue H as the color data of the target is detected without being influenced by the brightness, and the trajectory of the target and various data are calculated based on the detected value, and the influence of ambient brightness at that time is calculated. Stable trajectory analysis and various data will be provided without receiving it.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. Here, FIG. 1 is a block diagram showing the configuration of the embodiment.

As shown in FIG. 1, the embodiment is a case in which a target 1 color-marked with a predetermined color is attached to one position of a knee of a subject 3, and the predetermined color is red (R). ,
A single color of each color such as green (G) and yellow (Y) or a plurality of colors in combination of a plurality of colors may be used, and the target 1 is generally attached at a plurality of places. Two television cameras 4a and 4b for tracking and photographing the movement trajectory of the target 1 are provided, and the same operation analysis devices A1 and A2 and the video television recorder 5 are arranged in parallel in each of the telego cameras 4a and 4b. It is connected. The operation analysis apparatus will be described by taking the apparatus A1 connected to the television camera 4b as an example. The color signals R, G, and B of the image of the target 1 detected by the television camera 4b are input to the AD converter 6, and the AD converter 6 The color converter 7 is connected to the output terminal of. The output terminal of the color converter 7 is connected to the input terminal of the HSI conversion converter 8, and the output terminal of the HSI conversion converter 8 is connected to the color extraction lookup table 9. A computer 10 is connected to the color extraction lookup table 9, and the computer 10 has a hard disk 11 and a CR.
It is connected to T12. Here, the TV camera 4b
Captures the target 1 moving with the motion of the subject 3 and decomposes the image signal of the target 1 into color signals of three primary colors of red (R), green (G) and blue (B), and R ,
It has a function of inputting G and B signals to the AD converter 6,
The video television recorder 5 has a function of displaying an image of the target 1 on a CRT by using these R, G, and B signals as a monitor, and the AD converter 6 has a function of AD-converting the R, G, and B signals. ing. Further, the color converter 7 converts the R, G, B signals into (R + G + B) signals,
The HSI conversion converter 8 has a function of calculating the (R−G) signal and the (R−B) signal, and the (R + G + B) signal,
It has a function of calculating the hue signal H, the saturation signal S, and the lightness signal I based on the (R-G) signal and the (RB) signal as in the expressions (1) to (3). .

H = tan ⁻¹ (G−B) / (2R−G−B) (1) S = {(B−R) ² + (R−G) ² + (G−B) ² } / 3 (2) I = R + G + B (3) Further, the color extraction lookup table 9 has a function of providing data for a color extraction operation based on the hue signal H, the saturation signal S, and the lightness signal I, Computer 1
0 uses the data of the color extraction lookup table 9 based on the hue signal H, the saturation signal S, and the lightness signal I to calculate the trajectory of the target 1 and calculate various analysis data regarding the subject 3. The hard disk 11 has a function of storing analysis data of the computer 10, and the CRT 12 has a function of displaying analysis data of the computer 10.

The video television recorder 5 uses the equation (4) as the luminance signal Y and the equation (5) as the color difference signal based on the R, G and B signals from the television camera 4b in the same manner as in the conventional case. And image processing is performed.

Y = 0.3R + 0.59G + 0.11B (4) R−Y = 0.7R−0.59G−0.11B B−Y = −0.3R−0.59G + 0.89B (5) G−Y = −0.3R + 0.41G−0.11B (4) From the expressions (5), the ones within the shaded area in FIG. 2 which have already been described based on Y, RY, and BY are detected as the target color. The detection monitor image in this color is displayed on the video television recorder 5.

However, the target color image data input to the computer 10 is based on the equations (1) to (3) calculated by the HSI conversion converter 8, and the hue signal H is the R, G, B signals. Since it is not affected by the luminance of the computer 10, the computer 10 can perform calculation with stable data that does not depend on the brightness of the surroundings.

Next, the operation of the embodiment having such a configuration will be described.

In order to obtain various data by attaching the target 1 of a predetermined color to the knee of the subject 3 using a belt or the like and analyzing the three-dimensional trajectory of the target 1 with the movement of the subject. The target 1 is photographed by the two TV cameras 4a and 4b, but the photographing operation of each of the TV cameras 4a and 4b is the same, so the case of the television camera 4b will be described. Target 1 obtained by shooting with TV camera 4b
The R, G, and B signals of the color image are input to the video television recorder 5, and the video television recorder 5 uses the equation (4) as the luminance signal Y based on these signals, and the color difference signal is obtained. (5) is used to perform image processing, and the color image of the target 1 is displayed on the CRT as a monitor image.

On the other hand, R, G, B from the TV camera 4b
The signal is AD-converted by the AD converter 6 and then input to the color converter 7, and the color converter 7 calculates the (R + G + B) signal, the (RG) signal, and the (RB) signal based on these signals. And output. The (R + G + B) signal, the (R-G) signal, and the (RB) signal are input to the HSI conversion converter 8, and the HSI conversion converter 8 outputs the hue signal H,
The saturation signal S and the lightness signal I have already been described in equation (1).
It is calculated by the equation (3). Then, based on the obtained hue signal H, saturation signal S, and lightness signal I, the computer 10 uses the data of the color extraction lookup table 9 to calculate the locus of the target 1 and relates to the subject 3. Calculate various analysis data. The various data calculated in this way are stored in the hard disk 11, and these data are displayed on the CRT 12.

Image processing similar to that described above is performed by the television camera 4.
The three-dimensional trajectory of the target 1 attached to the knees of the subject and various data of the operation function of the subject 3 based on the three-dimensional trajectory of the target 1 attached to the knees of the subject by the two TV cameras 4a and 4b. Is calculated. Therefore, the doctor can confirm the degree of functional recovery of the patient, who is a patient, based on these data, and consider future treatment policies.
The instructor can grasp the defects in the exercise movement of the subject and can effectively and effectively provide the exercise instruction.

As described above, according to the embodiment, the hue H and the saturation S of the color-marked target 1 are obtained without being affected by the luminance information, that is, without being influenced by the ambient brightness at that time. It is possible to stably calculate the color data value of the target 1, and based on this color data,
It is possible to provide various types of highly accurate data that can be used as a reference for treatment or exercise of the subject.

[0020]

As described above, according to the present invention,
The detection calculation means calculates the three attributes of the color of the color-marked target attached to a predetermined part of the subject as R,
The hue H based on the G and B signals is H = tan ⁻¹ (G−
B) / (2R-G-B), saturation S, S = {(B-R)
2+ (R−G) 2+ (G−B) 2} / 3, the brightness I is I
Since it is detected and calculated as = R + G + B, various highly accurate data regarding movement of the target used for recovering the function of the subject or improving the motor function can be stably obtained without being affected by the ambient brightness. Can be provided.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of color difference data and luminance data in a conventional device, (a) is an explanatory diagram showing color difference data, and (b) is an explanatory diagram showing luminance data.

[Explanation of symbols]

 1 Target 3 Subject 4a, 4b Television camera 5 Video television recorder 6 AD converter 7 Color converter 8 HSI conversion converter 9 Color extraction lookup table 10 Computer 11 Hard disk 12 CRT

Claims (1)

[Claims] 1. A color-marked target having a predetermined area is attached to a subject site, and the movement trajectory of the target accompanying the movement of the subject is tracked and photographed by at least one TV camera, and the target is associated with measurement coordinates. In a motion analysis device for a subject region that calculates imaging data and analyzes the motion of the subject region, the three attributes of the color of the target are hue H based on R, G, and B signals, and H = tan.
⁻¹ (G−B) / (2R−G−B), saturation S, S =
{(B−R) ² + (R−G) ² + (G−B) ² } / 3,
A motion analysis apparatus for a subject region, comprising a detection calculation unit that detects and calculates the brightness I as I = R + G + B.