JP3205030B2 - Automatic adjustment method of pointer type indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of automatically adjusting a pointer-type indicating instrument for adjusting a pointing position of a pointer using a camera such as an ITV or CCD type camera.

[0002]

2. Description of the Related Art Conventionally, finger pointing adjustment of a pointer-type indicating instrument has been performed by:
(1) First, a reference signal is input to the pointer-type indicating instrument, and the pointer is moved toward the target finger. Thereafter, the indicated value of the pointer is compared with a target value corresponding to the reference signal, and the pointing resistance variable resistor of the pointer-type indicating instrument is adjusted so that the indicated value becomes the target value.

Next, (2) another reference signal having a different value from the reference signal is input, and the pointer is moved toward another target finger. After that, the indicated value of the pointer is compared with the target value corresponding to the reference signal, and the finger resistance adjusting variable resistor of the pointer-type indicating instrument is adjusted again so that the indicated value becomes the target value. Go.

[0004] Similarly, (3) several different reference signals are sequentially input to adjust the pointing resistance variable resistor.

[0005] Then, by successively repeating the adjustments (1), (2) and (3), the pointing is adjusted so that the pointer indicates an accurate indicated value for any input signal. is there.

[0006]

However, in such a finger pointing adjustment method, since the adjustment of (1), (2), and (3) is repeated many times, it is very difficult to adjust the indicated value. There was a problem that it took time.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of automatically adjusting a pointer-type indicating instrument that can perform adjustment in a short time.

[0008]

In order to achieve the above object, the present invention provides a pointer which is displaced and moved along a plurality of graduations provided on a graduation plate in accordance with a value of an input signal, and a designated value of the pointer. Using a measuring camera arranged opposite to the scale plate of a pointer-type indicating instrument having a finger-adjustment variable resistor for adjusting the position, and a positioning motor for adjusting the resistance value of the variable resistor for adjustment. An automatic adjustment method of a pointer-type indicating instrument that automatically adjusts the indicated value of the pointer by capturing a scale plate with the measurement camera, setting coordinates on the captured scale plate image, and setting each scale. Find the position and the scale
A first step of setting the adjustment reference point than location, said adjustment reference
A second step of inputting an input signal corresponding to a point to the pointer-type indicating instrument and adjusting the variable resistor for adjustment to maximize the deflection of the pointer; and a target position corresponding to the value of the input signal. A third step of moving the pointer to the vicinity of the target, and measuring an indicated value of the pointer moved in the third step based on image data obtained from the measuring camera, and measuring the indicated value of the pointer and the target A fourth step of calculating a difference from the position, a fifth step of adjusting the adjusting variable resistor according to the difference to move the pointer to a target value, and a designated value of the pointer moved in the fifth step Is measured based on image data obtained from the measurement camera, and a difference between the measured indicated value and the target value is calculated, and it is determined whether or not the difference is within an allowable range. Adjustment ends when it is determined that Characterized in that it includes a sixth step of returning to the fifth step when it is determined that the non-allowable range.

[0009]

According to the present invention, in the first step, the scale plate is imaged by a measuring camera, coordinates are set on the scaled image, and the position of each scale is obtained .
Set the adjustment reference point .

In a second step, an input signal is input to the pointer-type indicating instrument, and the pointing resistance variable resistor is adjusted to maximize the deflection of the pointer.

In a third step, the pointer is moved to a position near a target position corresponding to the input signal.

In a fourth step, an indication value of the pointer moved in the third step is measured based on image data obtained from the measuring camera, and a difference between the measured indication value of the pointer and the target position is calculated. I do.

In a fifth step, the adjusting variable resistor is adjusted according to the difference to move the pointer to a target value.

In a sixth step, an indicator value of the pointer moved in the fifth step is measured based on image data obtained from the measuring camera, and a difference between the measured indicator value and the target value is calculated. Then, it is determined whether or not the difference is within the allowable range. When it is determined that the difference is within the allowable range, the adjustment is terminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for automatically adjusting a pointer-type indicating instrument according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an unadjusted eddy current type speed meter (pointer type indicating device), and a plurality of scales M are provided on a scale 2 of the speed meter 1. Reference numeral 3 denotes a pointer which is displaced and moved along the scale M. Reference numeral 4 denotes a measurement camera arranged to face the scale plate 2, 5 denotes an image memory for storing images (m pixels in the horizontal (X direction) and n pixels in the vertical direction (Y direction)) taken by the measurement camera 4, 6 Is a microcomputer that reads an image from an image memory and performs image processing, various arithmetic processing, and the like. The microcomputer 6 controls a positioning motor 7 and an instrument driving unit 8 which will be described later.

The positioning motor 7 adjusts an adjusting variable resistor 9 provided in the eddy current type speedometer 1. The pointing adjusting variable resistor 9 adjusts the indicated value of the pointer 3. belongs to. The instrument driving section 8 outputs a speed signal in accordance with a command from the microcomputer 6.

Next, the operation of the above embodiment will be described with reference to the flowchart shown in FIG.

In step 1, the scale plate 2 of the speedometer 1 is photographed by the measuring camera 4, and the photographed image is stored in the image memory 5, and as shown in FIG.
An XY coordinate system with the horizontal direction as the Y axis is assumed. Then, X, Y of each of the scales M1 to M3 serving as a reference of the speedometer 1
The first moment with respect to the axis is obtained, and each center of gravity G1 (X1, Y
1) Find G2 (X2, Y2) and G3 (X3, Y3).

In step 1, the center of gravity G1 and the center of gravity G3
From the predetermined angles θ1 and θ2, a straight line L5 passing through the center of gravity G1 and forming an angle θ1 with the straight line L1 and a straight line L5 passing through the center of gravity G2 and forming an angle θ2 with the straight line L5. , And the intersection of the straight line L4 and the straight line L5 is found, and this intersection is set as the adjustment reference point P (XP, YP).

In step 2, the instrument driver 8 outputs a speed signal corresponding to the adjustment reference point P in accordance with a command from the microcomputer 6 to move the pointer 3 of the speedometer 1. Then, the positioning motor 7 adjusts the finger-adjustment variable resistor 9 in accordance with a command from the microcomputer 6 to move the pointer 3 to a position where the deflection becomes maximum.

In step 3, a square mask T of several pixels on one side centering on the adjustment reference point P is set, and the pointing resistance variable resistor 9 is adjusted by the positioning motor 7, and the pointer 3 is adjusted.
Is moved from the maximum position into the mask T to move the pointer 3 to the vicinity of the adjustment reference point P. The determination as to whether or not the pointer 3 has entered the mask T is made by image processing.

In step 4, a straight line L2 connecting the center of gravity G1 and the center of gravity G2 and a straight line L3 connecting the center of gravity G2 and the center of gravity G3 are set. Further, the center of gravity R (XR, YR) of the pointer 3 and the inclination angle θ0 of the principal axis of inertia of the pointer 3 are calculated from the image data stored in the image memory 5, and a straight line L0 is formed on the same line as the pointer 3 from these calculated values. Suppose.

Next, straight lines L0 and L2 and straight lines L0 and L3
S2 (XS2, YS2) and S3 (XS3, YS3)
The distance from the center of gravity R of the pointer 3 to the intersection S2 is compared with the distance from the center of gravity R to the intersection S3. According to this comparison result,
As for the indicated value of the pointer 3, the indicated value M0 of the pointer 3 is calculated by respective equations corresponding to the following three conditions.

[Condition 1] When (distance between R and S2)> (distance between R and S3), M0 = M2 + (M3−M2) × (distance between G2 and S3) / (G2
~ Distance between G3).

[Condition 2] When (distance between R and S2) <(distance between R and S3), M0 = M2− (M2−M1) × (distance between G2 and S2) / (G1
~ Distance between G2).

[Condition 3] When (distance between R and S2) = (distance between R and S3), M0 = M2.

In step 5, the designated value M0 of the pointer 3 is determined, and the difference ΔM between the designated value M0 and the adjustment target value C0 corresponding to the reference point P is determined. The amount of adjustment of the finger-adjustment variable resistor 9 required to move the pointer 3 by the preset pointer instruction value per unit is V, and the drive instruction value of the positioning motor 7 that is adjusted by this adjustment amount V Is QC, the driving instruction value Q for moving the pointer 3 by ΔM is Q = QC × ΔM.

The microcomputer 6 outputs the drive instruction value Q to drive the positioning motor 7, thereby adjusting the finger adjustment variable resistor 9 and moving the pointer 3 to the adjustment target value C0.

Here, only the pointer indicated value per unit is indicated by the pointer 3
Command value QC of the positioning motor 7 for moving the motor
Is preferably set based on a number of test results in consideration of the variation in the linearity of the finger adjustment variable resistor 9 of the speedometer 1.

In step 6, the designated value M0 'of the pointer 3 moved in step 5 is obtained again.
′ And the adjustment target value C0, and it is determined whether or not the difference is within an allowable range. If the difference is within the allowable range, the adjustment to the adjustment target value C0 is completed, and if the difference is outside the allowable range. For example, the process returns to step 5, and the operations of steps 5 and 6 are repeated until the operation falls within the allowable range.

Each of the preset adjustment target values C1 to C1
The adjustment shown in steps 1 to 6 is performed for Cn.

[0033]

According to the present invention, as described above, the amount of movement of the pointer by driving the finger-adjustment variable resistor can be constantly predicted and calculated, so that the entire adjustment process can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment for implementing a method for automatically adjusting a pointer-type indicating instrument according to the present invention;

FIG. 2 is a flowchart showing the operation of the microcomputer;

FIG. 3 is an explanatory diagram showing an image of a dial.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speedometer (pointer type indicator) 2 Dial 3 Pointer 4 Camera for measurement 7 Positioning motor 9 Variable resistor for finger adjustment

Claims (1)

(57) [Claims] 1. A pointer type having a pointer displaced and moved along a plurality of graduations provided on a graduation plate in accordance with a value of an input signal, and a finger-adjustment variable resistor for adjusting the indicated value of the pointer. Pointer-type indicating instrument for automatically adjusting the indicating value of the pointer using a measuring camera arranged opposite to the scale plate of the indicating instrument and a positioning motor for adjusting the resistance value of the adjusting variable resistor. An automatic adjustment method, wherein a scale plate is captured by the measurement camera, coordinates are set on the captured scale plate image, the position of each scale is determined, and an adjustment reference point is set from the scale position . A second step of inputting an input signal corresponding to the adjustment reference point to the pointer-type indicating instrument and adjusting the adjustment variable resistor to maximize the deflection of the pointer; Target position corresponding to the value of A third step of moving the pointer to the vicinity, measuring an indicated value of the pointer moved in the third step based on image data obtained from the measuring camera, and measuring the indicated value of the pointer and the target position The fourth to calculate the difference with
A fifth step of adjusting the variable resistor for adjustment in accordance with the difference and moving the pointer to a target value; and an image obtained from the measuring camera as an indication of the pointer moved in the fifth step. Measure based on the data, calculate the difference between the measured indicated value and the target value, determine whether the difference is within the allowable range, and terminate the adjustment when it is determined that the difference is within the allowable range, Fifth when it is judged that it is out of the allowable range
A method for automatically adjusting a pointer-type indicating instrument, comprising: a sixth step of returning to a step.