JPS6013123B2 - Subject dimension measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention captures an image of an object to be measured using a television camera, displays the object image on a screen such as a video monitor using the video signal, and simultaneously displays multiple cursor lines on the screen. The present invention relates to an improvement of an apparatus for measuring the dimensions of an object by aligning the outline of an object image with a cursor line and electronically measuring the distance between each cursor line at this time.

Fig. 1 shows the measurement principle of such a conventional device, in which a subject image 2 taken by a television camera is displayed on a screen 1 of a video monitor, etc., and at the same time, the subject image 2 is displayed parallel to and in the interval direction, that is, in the same figure, by means described later. , displays two cursor lines 3 and 4 that can be moved in the left and right directions, and aligns the cursor lines 3 and 4 with the outlines 5A and 5B of the subject image 2, and determines the distance between the two cursor lines 3 and 4 at this time. The outer dimensions of the subject image 2 are determined from the above, and the outer dimensions of the subject are measured based on this.

Figure a shows the waveform of a cursor line signal for displaying cursor lines 3 and 4, and Figure b shows the waveform of a video signal for displaying subject image 2, where cursor lines 3 and 4 coincide with outlines 5A and 5B. Then, the time difference t on the time scale between the two cursor line signals will correspond to the external dimensions of the object, and if calibration is performed in advance using an object of known dimensions,
Time difference t, that is, time to time.

The external dimensions of the object can be determined by electronic measurement using a pulse pulse or the like. However, with the above method, is the outer shell 5A? The operation of aligning the cursor lines 3 and 58 with the cursor lines 3 and 4 is inaccurate because it is performed by visual inspection, and has the drawback of being susceptible to individual differences and not being able to perform highly accurate measurements.

The present invention has an object of fundamentally solving the above-mentioned drawbacks of the conventional art, and in order to display on the same screen an indication line that intersects with the cursor line and is movable in the direction in which the cursor line extends. a means for generating a pointing line signal of the object, a means of generating a matching signal between the pointing line signal and the outline of the image signal of the subject, and a means for generating a matching signal between the matching signal and a cursor line signal for displaying the force-sor line. means for detecting a match;
means for changing either the cursor line signal or the indication line signal upon detection of this coincidence; To provide a subject dimension measuring device that changes the display of a cursor line or an indication line when a match is made, and makes it possible to reliably and easily match the cursor line to the outline.

The details of the present invention will be explained below with reference to the block diagram of FIG. 2 showing an embodiment and the time charts of FIGS. 3 to 5 showing waveforms of each part in FIG. 2.

The differentiating circuits DF, DF2 to flip-flop circuit FF3 in FIG. 2 are means for generating an instruction line signal for displaying an instruction line 6 on the screen 1 of the video monitor PM. The horizontal drive signal HD and vertical drive signal VD from 101, IQ3 in FIG.
It has the waveform shown in , and by differentiating these changing points in the differentiating circuits DF, DF2, we obtain the pulse IQ2, 104 in the same figure. A pulse IQ5 is obtained at every interval (period from the beginning of a field to the next field), and this is used to drive a pulse generator MN, using a monostable multipipulator, etc., and the pulse width is changed by a variable resistor RV. The determined pulse IQ6 is generated.

Note that Figure 3a shows the period of IH (IH is the period from the beginning of one scanning line to the next scanning line), and Figure 3b shows the period of several volts for the same signal, and the IH portion in b is expanded. It is shown in a.

The signal 106 is connected to the flip-flop circuit FF by its trailing edge.
, but the reset is the output 1 of the differentiator circuit DF2.
04 in the low level (hereinafter referred to as "L") direction, and produces a signal 107 as an output, which causes the pulse generator MV using a monostable multipipulator etc.
2 and has a constant pulse width t2.
Furthermore, the trailing edge of the signal 108 sets the flip-flop circuit FF2.

However, the reset is caused by the output 104 of the differentiator circuit DF2.
The sum of the pulse width of the output 109 obtained thereby and the pulse width of the output 08 of the pulse generator MN2 exactly matches IH. Therefore, flip-flop circuit FF. If the trailing edge of the output IQ7 sets the flip-flop circuit FF3, and the trailing edge of the output 109 of the flip-flop circuit FF2 resets the flip-flop circuit FF3, an output 110 over the period of IH is obtained, which is used as an instruction line signal to send to the mixer MX. , by TV camera C
When combined with the video signal 111 from M, a signal 112 is obtained, and when this is applied to the video monitor PM, the IH period, that is, the instruction line 6 for one scanning line is displayed horizontally.

In addition, the flip-flop circuit FF3 in the period IV
The point in time at which the output 110 of is generated is determined based on the pulse width of the output 106 of the pulse generator MV. Therefore, by adjusting the variable resistor RV, the indication line 6 which intersects the cursor lines 3 and 4, that is, is orthogonal at this time, is determined based on the pulse width of the output 106 of the pulse generator MV. , cursor line 3
, 4, that is, in the vertical direction. Note that the instruction line signal 11 for displaying the instruction line 6
0' and every other IV, but this is because the scanning lines of every other field are at the same position on screen 1 due to interlaced scanning for each field, so it is necessary to always display the indication line 6 at the same position. This is how it is done.Next, a means for generating a matching signal between the above-mentioned instruction line signal 110 and the outline of the video signal of the subject will be explained.

A pair of pulse generators V3L and MN similar to P to pulse generator MV2 correspond to the comparator in FIG. When the signal is extracted, a video signal 113 that does not include a horizontal synchronization component is obtained, and this is applied to the input of AND gate G2, and at the same time, the instruction line signal 110 is applied to the other input of the gate Q. Only the period during which line signal 110 exists is taken out as output 114.

The world power 114 represents a scanning line on the screen 1 that matches the indication line 6 of the subject image 2, and its front edge and back green correspond to the outer edges 5A and 5B of the subject image 2, and at the same time, this It shows the intersection points 7A, 78 between the outlines 5A, 58 and the indication line 6. Therefore, if a signal is generated based on the leading edge and trailing edge of output 114, a match signal can be obtained.

That is, the pulse generator V3R, which generates a pulse 117 with a pulse width of R, is driven by the trailing edge of the output 114, and the output 114 is inverted by the inverter IV, and the front green of the output 115 drives the pulse generator MV3L. This pulse output 116 becomes a match signal corresponding to the intersection point 7A with the left cursor line 3, and similarly, the output 117 corresponds to the intersection point 7A with the right cursor line 4. This is a match signal corresponding to 7B. Note that the pulse widths t3L and t3R of the outputs 116 and 117 are determined to be approximately equal. Next, means for detecting a match between the matching signals 116, 117 and a cursor line signal for displaying the cursor lines 3, 4, means for applying a change to the cursor line signal by detecting the match, and generating a cursor line signal. Block 1 as a means to
I will explain it carefully.

Note that since blocks 1 and 0' are similar, block 1 will be explained first. A pulse generator MV4L similar to the pulse generator MV receives a horizontal drive signal H as shown in FIG.
D, that is, the signal 1 is driven by the "L" direction front green of 103 and has a pulse width t4 determined by the variable resistor V2L.
18, and then green drives a pulse generator MV5L similar to the pulse generator MN, generating a pulse 119 having the same pulse width L as the output 116 of the pulse generator My. In addition, the cursor line 3 moves in the left-right direction according to the operation of the variable resistor RV2L, and when the cursor line 3 matches the intersection 7A, the pulse is 119, and when it does not match, the pulse is 1.
19N, and for convenience, the pulse 119 when they match.
The explanation will be based on the following. Pulse 1 19 is NAND
is given to the input of gate G, and along with this, the same gate G3
The above-mentioned match signal 116 is given to the other input of L, and when both inputs match, the output 120 of the same gate G&
becomes “L”, and the leading edge of this “L” direction pulse activates the pulse generator MN using a monostable multi-pipulator etc.
constant pulse width t over the next field
A pulse 121 of 6L is generated, and then a similar pulse generator MV7L is driven by green to generate a pulse 122 of substantially the same pulse width t7L.

Note that the sum of pulses 1 21 and 122 is longer than 2V, and pulse 12 is generated before pulse 122 ends.
1 is generated, and this is repeated as long as there is a match signal 116. The pulse 122 is given to the input of the NAND gate G4, and the output 121 of the pulse generator MV is given to the other input of the gate G4L, and unless both inputs are "L", the output 123 is “L”, and this output 123 and the output 1 1 of the pulse generator MN disturbance
Since one input 123 of the NAND gate G5L to which 9 is given to the input is "L", the output 124 is fixed at a high level (hereinafter referred to as "H"), and the pulse 1 19 from the pulse generator MV disturbance is fixed. to prevent the transmission of In addition, pulse 1
Reference numeral 19 is a cursor line signal that displays the cursor line 3 when sent from the NAND gate ○5L, and by stopping the sending, the cursor line 3 disappears, and a change is given to the cursor line signal. The operation of block n is also the same as that of the same aircraft, but the display position of the cursor line 4 moves by operating the variable resistor RV2R of the pulse generator My rudder, and when the intersection 7B of the subject image 2 and the cursor line 4 match, the display disappears. do.

Note that the exclusive OR (hereinafter referred to as EOR) gate G6 to counter CT electronically measure the interval between the cursor lines 3 and 4, and the exclusive logic of each output 1, 18, and 125 of the pulse generators My4L and MN4R. When the sum is obtained in EOR gate G6, the output 130 becomes "H" when only one of the two becomes "L", and if this is given to AND gate G7 together with the clock pulse CK, the output of cursor lines 3 and 4 becomes "H". Clock pulse C only during the period corresponding to interval t
K is sent to counter CT.

Therefore, the number of pulses is counted by the counter CT, and the external dimensions of the object can be determined from the result. Cursor line signal 119 and 12 stripes match signal wing 16
, 117, "In other words, ~ cursor line 3
, 4 do not coincide with the intersection points 7A, 78, the cursor line 3 and turtle are displayed as follows. At this time, the timing of occurrence of the matching signal 1 to 6 for the NAND gate ○ and the cursor line signal amount 19N is different, and as shown in Figure 5, the output of the NAND gate 03L 28N maintains 4'H''. Therefore, the pulse generator MV is not driven and its output 121N is fixed at "L", and similarly, the output 22N of the pulse generator MV7L is also "L", indicating that both inputs of NAND gate ○4L are "L"? .

Therefore, its output 23N becomes "H" and the cursor line signal 9N is output from the NAND gate G5L.
The output terminal 24N changes in accordance with the change in the cursor line signals 1 to 19N, and sends the cursor line signals 1 to 19N to the mixer MX3 as the inverted signal 2 to 19N. Furthermore, this applies to each gate 03R, G4R8 05R and each pulse generator MV of block 0.
The same applies to 6 to MV7R. Hook leather NA
ND gate C5L and block NAND gate 0
The inverted cursor line signals 24N9 and 127N from 5R are combined in the mixer MX3 and inverted to become the composite cursor line signal 2nd line N.Then, the mixer MK2 converts the composite cursor line signal 24N9 to 127N into the composite video signal of the instruction line signal IQ. 2 and becomes the final video signal 29N, which is sent to the video monitor P.
M, and these are displayed simultaneously.

As described above, two cursor lines 3 and 4 and an indication line 6 perpendicular to these are displayed together with the subject image 2 on the screen 1, and the indication line 6 is moved up and down to cross the measurement site of the subject image 2. After aligning them as objects, cursor line 39
4 in the horizontal direction, the intersection point 7A or ? of the subject image 2 in the cursor line 39 4 is moved. By determining the external dimensions of the object based on the instructions from the counter CT when both cursor lines 3 and 4 disappear from the line that coincides with B, extremely high-precision measurement is performed.

Note that the above-mentioned direction line 6 and force W sol line 3 are not limited to those that are perpendicular to the turtle, but may also be ones that rotate depending on the measurement part of the subject image 2. Similarly, the cursor lines 4 and 4 may also be parallel to each other. If so, it may be displayed horizontally.Also, when the cursor lines 3 and 4 match the intersection points TA and 7B on the outlines 5A and 58 of the subject image 2, the changes to the display include disappearing, blinking, etc. Alternatively, it may be changed from a solid line display to a dotted line display.Additionally, you may leave the cursor lines 3 and 4 as they are and then change the indication line 61.In other words, the cursor lines 3 and 4 may be changed. When one of them matches, the indicator line 6 changes from a solid line display to a dotted line display, and when the other matches, the dotted line display disappears. Alternatively, half of the indicator line 6 can be made to blink or disappear in the same way. To realize these, it is necessary to add a blinking oscillator and some gate circuits to the one shown in Figure 2.In addition, the configuration shown in Figure 2 can be modified in various ways depending on the design conditions. Needless to say, it can be transformed.As is clear from the above explanation, according to the present invention, the correspondence between the outline of the subject image and the cursor line is clearly shown on a screen such as a video monitor. The matching operation is easy, and even beginners can measure object dimensions with extremely high accuracy, and a remarkable effect can be obtained in non-contact dimension measurements of various objects.

[Brief explanation of the drawing]

Fig. 2 is a diagram showing the measurement principle of a conventional object dimension measuring device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Figs. 3 to 5 are time charts showing waveforms of various parts in Fig. 2. It is. Army...Screen, 2 books...Subject image, 3, Turtle...Cursor line, 5A, 5B...External, 6...Direction line, CM...
...TV camera, PM...video monitor, DF,,DF
2...Differential circuit "G,,○2,G7...AN
D Gate "MV, Toru MV2, MV ball, MV3L~M
V7L, My7R...Pulse generator, FF, ~FF3・
...Flip-flop circuit, CP...', comparator, I
V... Inverter "G3L, G3R ~ 05L, G
5R......NAND gate, OB...EOR gate (exclusive OR gate), CT...counter, MX, ~
MX3...Mixer, CK...Clock/res. Figure 1 Figure 2 Figure 5 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. An image of a subject is captured by a television camera, and an image of the subject is displayed on a screen using the video signal, and a plurality of cursor lines that are movable in parallel and spaced apart from each other are displayed on the screen. In an apparatus that matches the cursor line with the outline of the object image and electrically measures the dimensions of the object based on the interval between the cursor lines, means for generating an instruction line signal for displaying a movable instruction line on the screen, means for generating a matching signal between the instruction line signal and an outline of the video signal of the subject, and the matching signal. means for detecting coincidence with a cursor line signal for displaying the cursor line; and means for applying a change to either the cursor line signal or the instruction line signal upon detection of the coincidence; A subject dimension measuring device characterized by ensuring that each cursor line matches. 2. Claim 1 characterized in that two cursor lines displayed by two cursor line signals are used, and a pointer line signal generation means is used to display a pointer line orthogonal to the cursor line. Object dimension measuring device described in Section 2. 3. Claim 1, characterized in that a gate circuit for blocking the cursor line signal is used as means for imparting a change to either the cursor line signal or the instruction line signal.
Object dimension measuring device described in Section 2.