JPS58218656A - image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an image display device, particularly an image display device capable of displaying an image signal stored in a storage device on an oscilloscope capable of trigger sweep, which is normally used for measurement. Ran into.

2. Description of the Related Art Conventionally, for example, in an inspection apparatus using a television camera or the like, a television device has been used as an image display device for monitoring image signals and the like once stored in a storage device. However, in such conventional technology, generation of a synchronization signal for displaying an image signal stored in a storage device on a television device is complicated;
Therefore, there was a drawback that the circuit configuration was complicated and enormous. An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an image display device that is simple in construction and inexpensive.

In order to achieve this objective, the present invention uses an oscilloscope having a trigger sweep function, which is normally used for measurements, as a 1m display section, and an Il+
4. Use an address counter to function like a shift register, and input the image signal at a constant cycle.
The image display apparatus is characterized in that the image display apparatus according to the present invention is configured to display the f-th order image and uses the trigger sweep function of an oscilloscope for synchronization for display.] Hereinafter, an embodiment of the image display apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a block circuit diagram showing an embodiment of an image display device according to the present invention, and FIGS. 2(a) and (b)
and (C) are waveform diagrams for explaining the operation of the circuit of FIG. 1. 8141, 1 is an imaging device, 2 is an image signal, 3 is an Al1) conversion circuit, 4 and 6 are digitized image I# signals, 5 is a multiplexer, 7 is an image signal to be stored, and 8 is an Storage VC location allocation circuit, 9 is a control signal, 10 is a [li4-reference device, 11 is a write signal, 12 is a read signal, 13.18 is an address signal, 14 is an address counter, 15 is a clock signal generator, 16 17.19 is an oscilloscope, 17.19 is a /A conversion circuit, 20 is a trigger signal, and 21 is a vertical synchronization signal. The circuit 8 is controlled by a clock signal from a clock signal generator 15, and the address counter 4 counts the clock signal to generate an address signal 18, and writes the image signal to the storage device 10 and outputs the image signal from the storage device 10. Controls readout of image signals.

The storage device 10 has storage areas equal to the number of pixels corresponding to the resolution of the image of the imaging device 1, and can store the luminance signal of the pixel in each storage area. Now, assuming that the resolution of the image taken by the imaging device is m-2 vertically and n=2 horizontally, and the brightness gradation of each pixel is d=2, the storage device 10
requires an mxnxc bit capacity with mxn storage areas each capable of storing C bits, and the address counter 4 requires an (a+b) bit binary counter.

Memory in such an image display device “
The operation of writing image information to the drawing device 10 will be explained.

Image data such as pattern information converted into electrical signals by the imaging device 1 is input to the conversion circuit 3, and the brightness of each pixel constituting the image signal is determined by C bits. The digitized image fl is converted into a digital signal of
l (becomes PI number 4 and is input to multiplexer 5. Multiplexer 5 selects this image signal 4 or one of the other identical digitized image signals 6 1-1F
l+3 as the image signal 7 to be stored in the storage device t tlif
Give to il tract 8. The storage device control circuit 8 is controlled by a control signal 9 from a counter (not shown) or the like and an address signal 18 from an address counter 14, and supplies an inclination multiplication signal 11 and an address signal 13 to a storage device 1110, and outputs an address signal. Nr! specified by 13! 1. ltHf
A luminance signal for each pixel of image signal 1 is written in a predetermined area of il 10.

If the storage device 10 is configured with m memory cells arranged vertically and n horizontally in accordance with the vertical and horizontal resolutions of the image capturing device 1, the images captured by the image capturing device 1 can be I
Each pixel obtained from the IIIi1 image is stored in the storage device 10 in the same arrangement as the above image.

Next, the operation of reading out the image signal of 10 yen stored in the storage VC device as described above and displaying it on the oscilloscope 16 will be explained.

The address counter 14 cyclically counts the clock signal from the clock signal generator 15 in the same manner as in the write operation, and provides the address signal 18 of the (a and b) pits to the storage device control circuit 8. The storage device control circuit 8 uses this address signal 18 as an address signal 13 to control the storage device 10.
In addition, an O DZA is used to read the image signal in the storage device 10 and apply the read signal 12 to the 1)/A conversion circuit 17.
The conversion circuit 17 converts the C-bit luminance signal of each pixel read from the storage device 10 into an analog signal and applies it to the luminance signal terminal Z of the oscilloscope 16, thereby modulating the luminance of the electron beam of the display tube. On the other hand, a of the address counter 14
Carry signal from the bit, that is, B from the 3rd binary digit
A carry signal to +1 digit is input as a trigger signal 20 to the trigger signal input terminal TRIG of the oscilloscope 16, and the count value of the upper b bits of the address counter 14 becomes D.
/A conversion circuit 19.

From the binary a digit of the address counter 14 mentioned above, a +
Carry No. 11 to the 1st digit is issued every time the address counter 14 counts two clock signals, that is, n clock signals. It is issued by.

This carry signal &'J: is a pulse train as shown in FIG. 142(a). The oscilloscope 16 receives this carry signal as the trigger signal input terminal '7 [1].
l' It l (The oscilloscope itself generates a sawtooth wave in the X-axis direction, that is, 1) as shown in Fig. 2 for sweeping in the horizontal axis direction, and displays the display tube. Sweep control of the electron beam "g-4)O" In addition, the D/A converter circuit 19 reads out the entire contents of the storage device 10 once by converting the upper b bits of the address counter 14 into an analog signal. Second cause (C)
It generates a sawtooth wave as shown in ``[.This sawtooth wave is
Its period is 1173 M u m periods of the sawtooth wave of the horizontal axis regression shown in FIG. 2(b), and the flmi [synchronous Oscilloscope 16 as signal 21
is applied to the vertical input terminal Y of .

In this way, the image signal read out from the storage device 10 is luminance-modulated across the display tube of the oscilloscope by the trigger sweep function that the oscilloscope 16 normally has and the vertical synchronization signal obtained from the address signal. The image is displayed on the display tube by sweeping the electron beam.

In this embodiment, even during the writing operation of the image signal to the storage device 10, it is possible to display and monitor the image signal on the oscilloscope 16 in the same way as in the case of readout and display described above.

In the above embodiment, the hardware can be configured on a small scale and at low cost, and the displayed image can be enlarged or reduced by using the oscilloscope's vertical sweep gain adjustment function and horizontal sweep time axis adjustment function. It has the effect of being able to. For example, it is also possible to display the image of a small portion indicated by "(i, j)" in the storage device 10 of FIG. 1 on the entire display tube of the oscilloscope 16.

As explained above, according to the present invention, by using an oscilloscope that is normally used for measurement and using its trigger sweep function, it is possible to display a single image stored in a storage device. The configuration is simple and the above iM
It is possible to provide an image display device with excellent functions at a low cost without the drawbacks of the US technology.

[Brief explanation of the drawing]

FIG. 1 shows a block diagram showing an embodiment of an image display device according to the present invention, and FIG. 2 (a), (b), (c)
) is a waveform diagram for explaining the operation of FIG. 1. 1... Imaging device, 3... Al1) conversion circuit, 5... Multiplexer, 8...
Record 1, 1! Device control circuit, 10...H self 1:l
&Device allocation 14...Address counter, 15...
...Clock Shingetsu generator, 16...Oscilloscope, 17,19...I)/^ conversion circuit.

Claims (1)

[Claims] An image display device that displays an image signal read from a storage device that stores image signals converted into digital signals includes an address counter that uses the storage device as a shift register to sequentially read out the image signals at a constant cycle; a first DA conversion circuit that converts an image signal converted into a digital signal into an analog signal; a second DA conversion circuit that converts the output of the address counter into an analog signal; and an oscilloscope capable of trigger sweep; By applying the output signal of the first ODA conversion circuit as a luminance signal, the output signal of the second DA conversion circuit as a vertical synchronization signal, and the carry signal of a specific digit of the address counter as a trigger signal to the oscilloscope. An image display device characterized by being able to display images on an oscilloscope.