JPS6145436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention images a subject with a television camera and displays the subject image using an electronic image display device such as a cathode ray tube display. The present invention relates to an improvement of an apparatus that displays a cursor, superimposes the cursor and an image of the subject, and electrically measures the dimensions of the subject based on the cursor interval.

Figure 1 shows an example using a cathode ray tube display.
As shown in Figure A, a subject image 2 is displayed on the image plane 1 of the cathode ray tube, and solid or dotted cursors 3 and 4 are displayed with vertical bright lines that can be individually moved in the horizontal direction. For mixing, an external contour is selected as the opposing parts 5 and 6 of the object image 2, both cursors 3 and 4 are superimposed on this, and the external dimensions of the object are determined from the interval between the two cursors 3 and 4. Note that the cursors 3 and 4 are displayed by cursor signals having the waveform shown in FIG. In addition, C in the same figure is the video signal waveform of the subject image 2, which is approximately equal to the white level of the peak value.
A 10% pedestal is provided below the black level.

However, the contrast of the object image 2 varies depending on the color, shape, etc. of the object, and using the cursors 3 and 4 with constant brightness makes it extremely difficult to accurately superimpose the image when the outline is unclear. However, even though it is accurate to electrically determine the distance between the cursors 3 and 4, the inaccuracy of the overlay causes measurement errors.

The purpose of the present invention is to solve such drawbacks of the conventional art, and to image a subject with a television camera and display it as a subject image on an electronic image display device, and to move a cursor signal to opposite parts of the subject image. In a device that measures the dimensions of an object by superimposing displayed cursors of bright lines that are parallel to each other and determining the distance between the cursors by counting electrically generated clock pulses, a cursor signal with the opposite polarity to the cursor signal is generated. In addition to providing an inversion circuit,
The cursor signal and the reverse polarity cursor signal are characterized by a potentiometer that extracts an arbitrary voltage between the peak values and sends it as the final cursor signal, and adjusts the brightness of the cursor according to the contrast of the subject image. An object of the present invention is to provide an imaging dimension measuring device that can extremely easily and accurately superimpose a cursor on a predetermined region in an image of a subject by changing the cursor arbitrarily and over a wide range.

The details of the present invention will be explained below with reference to FIG. 2 and subsequent figures showing embodiments. FIG. 2 is a block diagram, and FIG. 3 is a time chart showing the waveforms of various parts in FIG. 2, where A is used to show the period 1h of one scanning line, and B is used to show the period 1v of one field. In Fig. 2, the TV camera CM that images the subject is controlled by a camera controller CC, and a complete video signal is formed in the camera controller CC and sent to a cathode ray tube display CD on a TV monitor, etc. , TV camera commercial with camera controller CC
A horizontal drive signal HD and a vertical drive signal VD generated for control are separately taken out, and the horizontal drive signal HD drives pulse generators MV ₁ and MV ₂ using monostable multivibrators or the like.

Pulse generators MV ₁ and MV ₂ are each variable resistors.
The pulse width generated by R ₁ and R ₂ is variable, and as shown in Figure 2A, the output 10 with pulse width t ₁
3 and similar output 104 at t ₂ . Both outputs 103 and 104 are logically ANDed at gate GT ₁ to become output 105, but since this period t ₃ corresponds to the interval between cursors 3 and 4 as will be explained later, the clock pulse generation circuit (not shown in the figure) generates an electric signal. At the same time, the clock pulse CK generated at t ₃ is gated.
The dimension between the cursors 3 and 4 can be measured by applying the clock pulses CK to the counter CT only during this period, and then counting the clock pulses CK and displaying them on the display DP.

On the other hand, the outputs 103 of the pulse generators MV ₁ and MV ₂ ,
Reference numeral 104 drives pulse generators MV ₃ and MV ₄ using a monostable multivibrator or a differential path, and outputs 106 with pulse widths t ₄ and t ₅ corresponding to the bright line widths of the cursors 3 and 4. , 107. That is, the output 106 becomes a cursor signal that displays the left cursor 3, and the output 107 becomes a cursor signal that displays the right cursor 4, and both are mixed by the mixer MX ₁ and output as an output 108, which is sent to the gate GT ₂ . Therefore, the cursors 3 and 4 are moved in the horizontal direction by adjusting the variable resistors R ₁ and R ₂ .

After the vertical drive signal VD passes through the inversion IV ₁ and becomes the inverted output 109 as shown in FIG. Turn GT ₂ on and off. Therefore, the output 111 of the gate GT ₂ is interrupted during one cycle of the vertical drive signal VD, that is, 1V, and the cursor signal 108 is sent and stopped repeatedly, so the cursors 3 and 4 become dotted bright lines. It will be displayed later.

The cursor signal 108 or 111 is directly applied to the mixer MX ₂ , mixed with the video signal 114 from the camera controller CC, and then converted into the signal 115.
If you send it to the cathode ray tube display CD as
As shown in Figure A, the following points are added in the present invention.

In other words, the output 111 of gate GT ₂ is an inverting circuit.
IV ₂ and as its output cursor signal 1
A cursor signal 112 of opposite polarity to 1 is obtained, and a final cursor signal 113 is taken from a potentiometer R ₃ bridge-connected to both cursor signals 111 and 112. Therefore, an arbitrary signal voltage between the peak value of the original cursor signal 111 and the peak value of the cursor signal 112 of opposite polarity is extracted, and thereby the cursors 3 and 4 in FIG. 1 become white. The brightness is changed from the level to the pedestal, and the brightness can be adjusted freely and over a wide range according to the contrast of the subject image 2 using the potentiometer _R3 .

It goes without saying that the present invention can also be applied when using a cursor displayed in the horizontal direction.

As is clear from the above description, according to the present invention, the brightness of the cursor can be changed arbitrarily and over a wide range, so that the superimposition operation can be performed at the most appropriate brightness of the cursor depending on the brightness and contrast of the subject image. This operation becomes easier and errors are eliminated, and measurement errors based on this can be avoided, extremely high precision and highly accurate measurement values can be obtained, and this is highly effective in measuring the dimensions of various objects.

[Brief explanation of the drawing]

Figure 1A is a diagram showing the subject image and cursor in an example using a cathode ray tube display, Figure 1B is a waveform diagram of the cursor signal, Figure C is a video signal waveform diagram of the subject image, and Figure 2 is a diagram of the subject image. A block diagram showing an embodiment of the invention,
FIG. 3 is a time chart showing the waveforms of each part in FIG. 2, where A indicates the period of one scanning line, and B
indicates the period of one field. 2... Subject image, 3, 4... Cursor, 5, 6... Opposing parts, CM... Television camera, CC... Camera controller, MV1 _{to MV4} ... Pulse generator, _GT1 ,
GT ₂ ...gate, MX ₁ , MX ₂ ...mixer, IV ₁ , IV ₂ ...
Inverting circuit, LO...Locked oscillator, CT...Counter, CD...CRT display, DP...Display, _R3 ...
Potentiometer, 108, 111, 113, 1
15...Cursor signal.

Claims (1)

[Claims] 1. An image of the subject is captured by a television camera and displayed as a subject image on an electronic image display device, and a cursor of parallel bright lines displayed by a cursor signal is superimposed on opposing parts of the subject image, In an apparatus for measuring the dimensions of the object by determining the interval between the cursors by counting electrically generated clock pulses, an inverting circuit for generating a cursor signal of opposite polarity to the cursor signal is provided, and the cursor signal and the opposite polarity are 1. An imaging dimension measuring device comprising a potentiometer that extracts an arbitrary voltage between the peak values of each polar cursor signal and sends it as a final cursor signal.