JPS61256207A - Relative length measuring apparatus of object on monitor screen - Google Patents

Abstract

PURPOSE:To enable intuitive display of the center position between a plurality of articles, by as signing either one of horizontal or vertical scanning direction of a manitor screen as the length measuring directional of an article and displaying overlappedly a plurality of pairs of length measuring element pair opposing the length measuring direction on the monitor screen. CONSTITUTION:When, among a plurality of length measuring elements 14, 15, either one of NO.1, NO.2 lenght measuring lement 14-1, 14-2 embraces both sides of the NO.01 article displayed on a monitor screen 13, the center position of the article 01 in the length measuring direction is displayed. Its form of display is not limited, however, when the form of the conventional cursons are selected as NO.1, NO.2 length measuring elements 14-1, 14-2, the cursor-like forms can be obtained, the same cursor- like forms can be allowed. Next, when NO.1, NO.2 length measuring elements 15-1, 15-2 or NO.1, NO.2 cursors of a different length measuring element 15 embrace both ends of the NO.2 article 02, then the center position in the length measuring direction relative to this article 02 can be displayed in the similar manner. Consequently, A mere glance on the monitor screen allows intuitive judgement, whether center positions of both articles 01, 02 are matched each other.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a bag device for measuring the length of an object displayed on a suitable monitor screen such as a cathode ray tube display (CRT).
The present invention relates to a relative length measuring device that can display the center positions of a plurality of objects in a specific length measuring direction.

<Prior art> A pair of length measurement elements, generally a line-shaped cursor, is displayed overlappingly on an image on a monitor screen such as a cathode tube display.
The position of each pair of cursors can be changed by the user's external operation, and a specific object displayed on the screen can be sandwiched between the pair of cursors from both sides.
A device is known that measures the dimensions of the object, ie, the width or height, in absolute values from the position of each cursor at that time.

<Problems to be Solved by the Invention> With the above-mentioned conventional device, although it is possible to measure the dimensions of a single object, it is not possible to know the relative positional relationship between a plurality of objects.

For example, in recent years, when mechanically assembling various electronic components, the electronic components being assembled are displayed on a monitor screen to check whether each part is axially aligned as expected.
In other words, we want to intuitively monitor whether the center positions match each other, whether the amount of deviation between them is within a predetermined degree, or whether it is within a predetermined tolerance range. However, conventional devices are naturally unable to meet this type of request.

The present invention has been made in view of these points, and it is an object of the present invention to provide a means for intuitively displaying the center position between multiple objects on a monitor screen, in addition to measuring their lengths in terms of absolute values. That is.

However, of course, in addition to displaying the center position of each object in the length measurement direction, it is also difficult to measure the length of each object in absolute value and quantitatively express the mutual deviation of the center positions. No, that's actually desirable.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a relative length measuring device having the following configuration.

At least one of the horizontal and vertical scanning directions of the monitor screen is taken as the length measurement direction of the object, and a plurality of length measurement element sets each consisting of a pair of first and second length measurement elements facing the length measurement direction,
A length measurement element display section that is superimposed on the monitor screen and is capable of moving the first and second length measurement elements of each length measurement element set along the length measurement direction by external operation: an object on a monitor screen, comprising: a center display section that displays a position obtained by bisecting the interval between the first and second length measurement elements in each of the length measurement element sections, superimposed on the monitor screen; relative length measuring device.

Function> In the present invention having the above configuration, among the plurality of length measurement element sets,
When both sides of an object displayed on the monitor screen are sandwiched between any one of the first and second length measurement elements, the center position of the object in the length measurement direction is displayed. Although the display form of the center position is not limited, for example, if a normal cursor-like form is selected as the first and second length measurement elements, the display form of the center position can be similarly cursor-like.

Next, if you pinch both sides of another object with the first and second length measurement elements or the first and second cursors of another set of length measurement elements, the center position in the length measurement direction for this object will be displayed in the same way. .

Therefore, whether or not the center positions of the two objects match each other can be intuitively determined at a glance on the monitor screen.

If there are more sets of length measurement elements, the center positional relationship between all the objects sandwiched between them will be displayed.

The above is the basic operation of the present invention, but in addition to this, the dimensions of the object sandwiched between the first and second length measurement elements of each set are measured and set to the absolute value in a selected arbitrary unit. It is also possible to quantitatively measure and display the amount of deviation between the center position displayed for one object and the center position displayed for another object in a selected arbitrary unit.

Further, according to the gist of the present invention, the length measurement direction is described as at least one of the horizontal and vertical scanning directions of the monitor screen, but it goes without saying that the present invention can also be applied to the circular scanning direction. This means that a pair of length-measuring elements for measuring the length of an object (which sandwich the object from above and below or from the left and right) may be provided in the vertical direction instead of in the horizontal direction, or may be provided in both directions. The specific circuit configuration itself for achieving this can be very easily assembled by those skilled in the art using known and existing electronic circuit technology.

Furthermore, each length measurement element may be movable not only in the length measurement direction but also in a direction perpendicular to the length measurement direction.

<Embodiment> A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

However, for simplicity, in this embodiment, the number of target objects whose center positions in the length measurement direction can be displayed on the monitor screen is two.

Figure 3 and subsequent figures explain the circuit of the embodiment described here. Figure 1 shows an example of the display mode on the monitor screen realized by this embodiment, and Figure 2 also shows this example. An example of a system configuration in an embodiment is shown.

To facilitate understanding, the functions achieved by this embodiment will first be explained with reference to FIGS. 1 and 2.

As shown in FIG. 2, the relative length measuring device 10 according to the present invention is used by being inserted between an imaging device 11, such as a normal camera, and a monitor device 12, which may be a normal cathode ray tube.

However, the image captured by the imaging device 11, for example, the video signal S carrying image information of the first object ol and the second object o2.
g substantially passes through the present relative length measuring device 10, and therefore, the object o1. o2 is projected.

This relative length measuring device 10 has a monitor screen 1 of a monitor device 12.
3J:, two length measurement element sets 14 and 15 are displayed superimposed on these object images of and o2, as shown in FIG.

In other words, the output video signal Sgo of the relative length measuring device 10
, at least the components of the input video signal Sg are loaded as they are, but in addition to this, each length measurement element display component is superimposed.

In the illustrated case, the first and second length-measuring elements 14-1, 14-2, 15-1, and 15-2 of each length-measuring element set 14, 15 are in the shape of a normal cursor, and the first The first and second cursors 14-1 and 14-2 of the cursor group 14 are black, and the first and second cursors 15 of the second cursor group 15 are black.
-1 and 15-2 are shown on a white background, and are distinguished from each other.

In this embodiment, the length measurement direction is the horizontal scanning direction of the monitor screen 13, and the length of each object of, o2 is measured by sandwiching it from both sides in the horizontal direction between the first and second cursors of each cursor group.

To this end, each cursor can be moved in the horizontal direction by the user's operation using the operating section 16 schematically shown in FIG.

That is, when the user operates a position setting knob or the like (not shown in FIG. 2) provided on the operation unit 18 for moving the first cursor, the relative length measuring device 1O changes the position of each horizontal scanning period. By variable control of the time from the start to the display, etc.
Distance f from the left edge of the monitor screen! ldl and d2 to set the display positions of the first cursors 14-1 and 15-1 of the first and second cursor sets 14 and 15, and in the same way, the user Now, when the second cursor position setting knob (not shown) is operated, the elapsed time from the display of the first cursors 14-1 and 15-1 is variably controlled correspondingly, and the distances or intervals d3 and d4 are changed. By this, the second cursors 14-2 and 15
-2 Set the display position.

In each cursor group 14, 15, a center position is displayed at a position equal to bisecting the distance d3, d4 between the first and second cursors. In this case, the center display means for the first cursor set 14 is a black center cursor 14ct, and the center position display means for the second cursor set 15 is a white center cursor 15ct.

In addition, the settings and inversion of white background and black background for each cursor are
Since this can be easily accomplished using a generally known and existing circuit system, a changeover switch or the like for this purpose may be provided in the operating section 1B, if necessary.

Each such cursor 14-1, 14-2, 14c
t; and 15-1, 15-2, and 15ct have the lengths, that is, the heights in the vertical scanning line direction, of the operating portion 1B.
Depending on the user's settings, or this relative length measuring device
It is determined appropriately by the preset settings in the main body of O.

Because of this, the user operates the operation unit 16 to place the first cursor 14-1 of the first cursor set 14 on the left side of the first object of, and also places the second cursor 14-2 on the left side of the first object of.
on the right side, and these pair of cursors 14-1
, 14-2, when the object 01 is sandwiched from both sides, the center position of the object in the length measurement direction is automatically displayed by the center cursor 14ct.

Similarly, when the first and second cursors 15-1 and 15-2 of the second cursor set 15 are used to pinch both sides of the second object ol through the operation of the operation unit 1B, the measurement of the second object can be performed. The center position in the longitudinal direction is automatically displayed using the center cursor 15ct.

Therefore, just by looking at the monitor screen 13, the user can
It is possible to intuitively judge whether or not these two objects of, o2 are centered. If they are aligned, both center cursors will be aligned on a straight line, 14ct, 15cH*, and if not, they will be located far apart on either the left or right side. Thus, if the objects o1, o2 are, for example, components of an electronic component that must be assembled in center alignment with each other.

Just by monitoring on the monitor screen, it is possible to immediately determine whether or not these meet the requirements.

The minimum functions to be achieved in the present invention are as described above, but in this embodiment, in addition to this, the first and second objects o1. It is also possible to measure the absolute value by converting o2 into an arbitrary unit, and to quantitatively display the amount of center deviation of a single object by converting it into an arbitrary unit.

These length measurement result display devices 17 can be used in addition to the present relative length measurement device 10, as shown in FIG. A display section 17-1, a display section 17-2 with the length or width d4 of the second object, and a display section 17ct with the mutual shift amount Δd of the center positions of both objects of, o2 can be provided, and they can also be provided. , a 7-segment display with an appropriate number of digits, or any other suitable known numerical display technology.

In this case, the center deviation amount display section 17ct shows that the center cursor 15ct of the second cursor group is displayed on the monitor screen with respect to the center cursor 14ct of the first cursor group.
Selectively press “+” to indicate whether it is shifted to the right or left.
A polarity display 17p that can be represented by "-" is also provided. Here, a case where the center cursor 15ct of the second cursor group 15 is located to the right on the monitor screen as shown in the figure than the center cursor 14ct of the first cursor group 14 is assumed to be "+".

In addition, each numerical display Ad, d3. The common unit assigned to d4 is determined by the magnification or reduction dust of the optical system including the imaging device 11, but as mentioned in advance, in the prototype example of the applicant, it is not only cm, -■ unit. , it has been demonstrated that resolution down to the fault level can be achieved.

The above-mentioned effect can be realized by the circuit configuration shown in FIG. 3 and subsequent figures as one embodiment.

As shown in FIG. 3, the object o1. The video signal Sg containing the image information of o2 is passed through a suitable video signal amplifier 18, superimposed with each cursor display information in the mixing circuit 13 as described later, and then outputted as an output video signal Sgo in FIGS. 1 and 2.
The information is output to the monitor device 12, which may be of any known, existing, and appropriate form as shown in the figure.

However, on the other hand, the input video signal Sg is
Vertical and horizontal synchronization signal separation circuits 2 provided at
0 is also input, and vertical and horizontal synchronization signals are extracted. For convenience of explanation, only the horizontal synchronization signal sh will be mainly considered here.

Based on this horizontal synchronization signal sh, the first cursor group display circuit 21 and the second cursor group display circuit 22 operate.
Since the contents of both circuits 21 and 22 may be exactly the same, the first cursor group display circuit 21 in FIG.
It only provides specific details regarding the following.

Hereinafter, if the circuit operation of the first cursor group display circuit 21 is also representative of that of the second cursor group display circuit 22, as shown in FIG. Each time a pulse signal rising in the direction is input as a pulse signal, as shown in FIG. Set it to “H”.

While the timer 23 continues to output significant logic "H", the variable frequency oscillator 27 stops oscillating.

When the time set in the timer 23 has elapsed, the variable frequency oscillator 27 starts oscillating at the frequency set by the oscillation frequency setting volume 23, as shown in FIG. 6(C), and this oscillation pulse train It is counted by the cursor display counter 31.

Then, when the -note pulse is counted, the “1” pulse is counted.
'°After the output from the signal detection circuit 33 is ANDed with the output of the length setting circuit 41 (described later), if the first cursor 14-1 is the horizontal scanning line to be displayed, The signal is outputted from the AND gate 51 to the mixing circuit 60 via the OR gate 49, and sent to the mixing circuit 18 via the black and white inverting circuit 61 in the white or black color mode selected by the setting switch 62, and outputs the output video signal Sgo. The horizontal scanning line portion of the first cursor 14-1 is displayed on the monitor screen of the monitor device.

As is clear from this, the length measurement direction position at which the first cursor 14-1 should be displayed, that is, the distance d1 from the left edge of the monitor screen in FIG.
It is determined by the length of the time Tt set in the timer 23 in 1.

Therefore, if this time setting volume 25 is provided in the operating section 1B shown in FIG. The horizontal position of the first cursor 14-1 can be set arbitrarily.

From this point of view, the time Tt setting volume 25
may be referred to as the first cursor positioning volume.

After the first cursor 14-1 is displayed, the second cursor 14-2 is displayed after a distance d3 when the number of output pulses of the variable frequency oscillator 27 is counted by a predetermined odd number "n". Here, “n” is an odd number because
As described later, the distance for displaying the center cursor (
This is to ensure the presence of the central pulse of the first to nth pulse trains when representing d3/2).

However, due to the display of the first cursor 14-1, when the counter 31 counts "1" and then eventually counts "n", as shown in FIG. 6(G), , the output pulse Put is emitted from the "n" detection circuit 37, and the horizontal scanning line at that time is the second cursor 14-
2, the pulse can be ANDed with the output of the length setting circuit 41 used for the first cursor and the shared length setting circuit 41, so the pulse is sent from the AND gate 55 to the OR gate. 48, a mixing circuit 60, a black-and-white inverting circuit 61, and a mixing circuit 19, the output video signal Sga is applied to the monitor device 12, and is displayed on the monitor screen of the monitor device to the second cursor 14.
-2 of that horizontal scan line portion is displayed.

As can be seen from this, the position of the second cursor 14-2 in the length measurement direction (horizontal scanning line direction) can be changed by making the oscillation frequency of the variable frequency oscillator 27 variable. Therefore, the frequency setting volume 28 for this purpose can also be read as a second cursor position setting volume, which may be provided in the operating section 1B in FIG. 2 so that the user can operate it.

On the other hand, the first cursor group! The center cursor 14ct of 4 is displayed when the counter 31 counts "(n+1)/2".

That is, when the counter 31 counts "(n+1)/2", as shown in FIG. 6(F), "(
n+1)/2" detection circuit 35 issues an output pulse Pctl for center position detection, and if the horizontal scanning line at that time forms part of the center cursor 14ct, the length setting Since the AND logic with the output of the circuit 45 can be obtained, the pulse is output to the AND gate 5.
3 through an OR gate 49, a mixing circuit 60, a black and white inverting circuit 61, and a mixing circuit 19, and is then applied to the output video signal Sgo and given to the monitor device 12, and is displayed on the monitor screen of the monitor device. Center cursor 1
That horizontal scanline portion of 4ct is displayed.

By repeating such a mechanism for each horizontal scanning line, the position of the first cursor 14-1 and the second cursor 14-2 on the monitor screen are set by the user. , a center cursor 14ct is automatically displayed at a position that bisects the interval between them.

For reference, the above-mentioned numerical value "n" is selected as "403" in the practical example of the present applicant, and therefore the detection signal Pctl from the center position detection circuit 35 is "20".
Appears on the 2nd pulse.

The above circuit operation is performed in exactly the same manner in the second cursor group display circuit 22, which has the same circuit configuration as the first cursor group display circuit 21.

Therefore, regarding this second cursor set, a volume group that can arbitrarily set the positions of the first cursor 15-1 and the second cursor 15-2 in the length measurement direction, for example, the cursor position corresponding to the first cursor position setting volume 25 described above, is used. A setting volume and a volume equivalent to the second cursor position setting volume 28 may be provided in the operation section 1fl, however,
It is considered that the volumes 43 and 47 for setting the vertical lengths of the first and second cursors and the center cursor do not need to be operated frequently, so there is no need to provide them in the operating section 18 so that they can be operated. This is not necessarily the case, and it may be built into the main body of the relative length measuring device 1O so that it can be adjusted only by the manufacturer at the time of shipment.

Further, the black and white color mode changeover switch 62 by the black and white inversion circuit B1 may also be provided in the operation section 18 or may be built in the main body.

In this embodiment, the first and second objects o1. o
The length measurement result d3 of No. 2 and the center position deviation amount Δd between the two objects can also be displayed as absolute values in arbitrary units.

This function will also be explained using the first cursor set 14 as a representative. Regarding the output of the cursor display counter 31, the "n" detection signal or second cursor position signal Pnl specifying the second cursor position and the distance or interval A "2" detection signal or a length measurement start signal Psi indicating the start of length measurement d3 is input to the first length measurement circuit 71.

An example of the configuration of the first length measuring circuit 71 is shown in FIG.

When the "2" detection signal Psi, which is issued immediately after the "1" detection signal or the first cursor position detection signal is issued, is sent to the first length measurement circuit 71, the input flip-flop 73 is set, and from then on,
As shown in FIG. 6(I), significant logic, for example logic "H", continues to be output.

Then, as shown in FIG. 6(J), the length measurement oscillator 75 starts oscillating at the frequency set by the frequency setting volume 77. .

The number of oscillation pulses is counted by the length measurement counter 79 over time, but eventually the 'n' detection signal or the second cursor position signal Pnl is sent and the flip
When the flop 73 is reset and the oscillation of the oscillator 75 stops, the count number of the counter 78 up to that point is
It is displayed on the display section 17-1 of the -th object length d3 of the display device 17 also shown in FIG.

Such a counting function is similarly performed for the second object 02 sandwiched between the second cursor set.

In FIG. 4, if the length measurement start signal Psi is replaced with the start signal Ps2 output from the second cursor group display circuit 22 in FIG. 3, and the second cursor position signal Pnl is similarly replaced with Pn2, then The circuit system shown in the figure directly serves as the second length measurement circuit 72 for the second cursor section, and the result is displayed on the display section 17-2 of the second object 024 of the display device 17.

These length measurement results can be displayed as absolute values by simply adding the necessary units to each display section.For example, if layer units are set, the numerical value will be displayed on the object length display section 17-1. is “875”, the actual size is 8
It can be made to mean 75g. However, of course, in order to do this, it is necessary to determine the reduction or enlargement ratio of the optical system and the oscillation frequency of the length measurement oscillator 75 so that the actual measurement value and the count value correspond one-to-one. It is necessary to.

On the other hand, even if there is no one-to-one correspondence between the actual size and the count value, it is possible to electronically multiply or divide the output of the counter to arrive at a corresponding actual size display result using recent technology. It's easy to do.

In addition, here, in order to easily understand the principle of the present invention,
Although detailed practical considerations are omitted, the above object length d3
, d4 may not need to be performed for each horizontal scanning line period; for example, it may be performed for a specific horizontal scanning line period every one or several frames of a 72-tap screen; The average of several chronologically adjacent counting results may be taken and displayed.

As a further desirable function in addition to the above, the detection and display of the center deviation amount Δd between the blue objects is performed as follows in this embodiment.

In FIG. 3, "(n+
1)/2" detection signals, that is, the first and second center cursor position signals Pctl and Pct2, are both input to the center-offset position measuring circuit 81. The configuration of this center-offset position measuring circuit 81 is, for example, It can be as shown in FIG.

The center cursor position signals Pctt and Pct2 are as follows:
It is input to a T-type flip-flop 83 via an input stage OR gate 82. Therefore 1. As shown in FIG. 1, when the first seven-point cursor 14ct is on the left side of the screen, its position signal Pctl is input first.

Continuing the explanation from this state now, the T-type flip-flop 83 is set by inputting the first center cursor position signal Pctl, and its output logic is set to ``H''. Along with this, the off-center needle measurement oscillator 84 starts oscillating. The frequency of the oscillation pulse train can be set with a frequency setting volume 85.

A little later, when the second center cursor position signal Pct2 is input, the T-type flip-flop 8
3 is reset, so oscillator 84 stops oscillating.

The number of pulses from the start of oscillation of the oscillator 84 until the stop of oscillation is counted by a counter for measuring the center deviation position, and the result is displayed on the center deviation amount display section 17ct of the display device 17 via the mixing circuit 88.

The reason why the signal is passed through the mixing circuit 88 is to superimpose the polarity display.

As mentioned earlier, when the first center cursor 14ct is to the left of the second center cursor 15ct, "
If the promise is made to display the case on the right side as "-", it is determined whether the T-type flip-flop is set by the first or second center cursor position signal Pctl or Pct2. By performing an AND with the output logic of a T-type flip-flop and making a determination using the +/- detection circuit 87, a positive/negative polarity display 17p can be displayed in the display section 17ct shown in FIG.

Regarding the measurement of the center deviation amount Δd, the various considerations described above regarding the object length can be applied as they are.

In addition, measurement of object lengths d3 and d4 and center deviation amount Δd
Initial calibration for measurements of can be easily done by using a scale with the correct dimensions.

For example, the calibration scale of known dimensions projected on the monitor screen 13 can be viewed from both sides by the first,
Second cursor 14-1, 14-2; 15-1,
When sandwiched between 15-2 and 15-2, first and second object length display sections 17-1 of display device 17; Oscillation frequency setting volume 75 of oscillator 75 for
Also, to calibrate the amount of deviation Ad between both center cursors, sandwich the calibration scale between the quantity center cursors 14ct and 15ct, and then adjust the amount of center deviation Δd displayed on the display section 17ct. The oscillation frequency setting volume 85 of the off-center needle measurement oscillator 84 shown in FIG. 5 may be adjusted so that the numerical value becomes equal to the actual size of the calibration scale.

Although the illustrated embodiment has been described above, there are many possible modifications to the embodiment.

For example, in the illustrated embodiment, the second cursor 14-2
, 15-2, that is, the setting of the elapsed time from the display of the first cursor to the display of the second cursor, was done by changing the oscillation frequency of the variable frequency oscillator 27, but on the contrary, this frequency is not reasonable. It is also possible to fix the "n" value to a certain constant value and make it variable. In that case, an arithmetic circuit of (!l+1)/2 is required to display the center cursor, but this It can be assembled with a relatively simple circuit.

In addition, in the case shown, the length measurement direction of the object is the horizontal scanning line direction with respect to the monitor screen, but this can be changed relatively easily to the vertical scanning line direction, and cursor sets facing each other in both directions can be used. It is also possible to provide In this way, of course, two-dimensional length measurement of the object to be measured can be performed.

In addition, in the present invention, length measurement means, as already obvious,
This refers to knowing the positions on both sides of the object that serve as a reference for obtaining at least the center cursor (center position display), and is therefore relative length measurement.In the illustrated embodiment, in addition to this basic relative length measurement, absolute It is equipped with a length measurement function.

Of course, the number of length measurement element sets to be superimposed and displayed on the monitor screen is arbitrary, and the gist of the present invention can be satisfied as long as it is at least two or more sets.

<Effects of the Invention> According to the present invention, the deviation of the center positions between a plurality of objects can be visually recognized intuitively on a monitor screen.

Moreover, the operation required of the user to display the center position is extremely simple, and does not require any skill. Simply measure the object using the first and second length measurement elements of each length measurement element set. Just apply it on both sides in the long direction.

Therefore, in the assembly process of various electronic parts, it is possible to judge at a glance whether or not the relative positions of the parts are correct, even without knowing the absolute dimensions of each part of the parts.
The assembly process is significantly streamlined.

Of course, the present invention can also be used in other surveying relationships, and particularly when relative positional relationships are a problem, the present invention is extremely effective.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an example of a function to be achieved by the present invention on a monitor screen, Fig. 2 is an explanatory diagram of an example of a system configuration for incorporating the relative length measuring device of the present invention, and Fig. 3 is an explanatory diagram of an example of a system configuration for incorporating the relative length measuring device of the present invention. A circuit configuration diagram of a preferred embodiment, FIG. 4 is a configuration diagram of an example of a length measurement circuit for measuring the length of a target object in absolute value, and FIG. A configuration diagram of an example of a center deviation position needle measuring circuit for quantitatively measuring the amount of center position deviation, FIG. 6 is a waveform diagram of essential parts in the circuit system of the embodiment shown in FIGS. 3 and 4,
It is. In the figure, 10 is a relative length measuring device according to the present invention, 11 is an imaging device, 12 is a monitor device, 13 is a monitor screen, 14 is a first cursor group, 14-1 is a third force sor of the first cursor group, 14-2 is the second cursor of the first cursor set, 14ct
is the center cursor of the first cursor group, 15 is the second cursor group, 15-1 is the first cursor of the second cursor group, 1
5-2 is the second cursor of the second cursor group, 15ct is the center cursor of the second cursor group, 18 is the operation unit, 17
17-1 is a length measurement result display device, 17-1 is a second object length display unit,
17-2 is a second object length display section, 17ct is a center deviation amount display section, IFJ is a mixing circuit, 20 is a synchronization signal separation circuit, 23 is a timer, 25 is a first cursor position setting volume, and 27 is a variable for cursor display. frequency oscillator, 29
is a second cursor position setting volume, 31 is a cursor position display counter, 61 is a black and white inversion circuit, 71 is a first length measurement circuit, 72 is a second length measurement circuit, 75 is a length measurement oscillator,
79 is a length measurement counter; 81 is an off-center position measuring circuit; 84 is an oscillator for off-center position measuring; 86 is a counter for off-center position measuring; 87 is a +/- detection circuit. 15th Near 7-'Hare Goshi

Claims (1)

[Scope of Claims] A length measurement element set consisting of a pair of first and second length measurement elements opposite to the length measurement direction, with at least one of the horizontal and vertical scanning directions of the monitor screen being the length measurement direction of the object. multiple sets,
a length measurement element display unit that is superimposed on the monitor screen and is capable of moving the first and second length measurement elements of each length measurement element set along the length measurement direction by external operation; an object on a monitor screen characterized by comprising: a center display section that displays, on the monitor screen, a position obtained by bisecting the interval between the first and second length measurement elements in each of the length measurement element sets; relative length measuring device.