JPH02181222A - Image display device - Google Patents

Abstract

PURPOSE:To execute the inversion of the upper and the lower parts and the left and the right without flickering on a screen by an operation of only a logical control of address data of an image memory by providing an odd number/even number field discriminator and plural image memories, etc. CONSTITUTION:An analog output of a TV camera 14 is inputted to an image memory 7 or 8 through an A/D converter 13 and a data input buffer 10 by a control of an odd number/even number field discriminator 1. Subsequently, outputs of the memories 7, 8 are inputted to a CRT 12 through an output buffer 9 and a D/A converter 11 and brought to image display. In this state, in the case of an inversion in the vertical direction of a display image, logic of address data for showing a vertical position is inverted at every 1 frame, and logic of address data for showing a horizontal position is made constant. On the other hand, in the case of an inversion in the left and the right directions of the display image, it is reverse to the case of the inversion in the vertical direction, and in the case of the inversion in both the vertical and the left and the right directions, both the address data are both inverted. In such a way, the inversion of the upper and the lower parts and the left and the right of the display image is executed satisfactorily by only a logical control of address data of the memories 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device suitable for reversing the direction of a displayed image vertically or horizontally.

[Conventional technology]

When observing a microscopic image with the eye and simultaneously capturing the image with a TV camera, the optical path is divided into two by a prism or a half mirror and guided to an eyepiece and a TV camera, respectively.

[Problem to be solved by the invention]

In this method, the directions of the visual image and the TV camera image may be reversed due to the difference in the number of lenses and mirrors between the object and the eye and the TV camera.

In this state, when the image is visually moved to the right, a problem arises in that the TV camera image moves to the left.

Conventionally, in order to eliminate such inconveniences, the number of mirrors was matched or the scanning direction of the electron beam of the image pickup tube of the TV camera was changed. However, with this method, the number of mirrors increases and the optical path becomes complicated, and the solid-state image sensor
There were problems with the camera, such as the inability to change the scanning direction.

An object of the present invention is to solve the above problems and provide an image display device suitable for realizing direction reversal of a displayed image.

[Means to solve the problem]

In the present invention, the image memory is provided for two screens, and the addresses of the image memory correspond to the vertical and horizontal positions of the displayed image.
Divide into two parts. The logic of each address data can be changed independently.

While writing one frame of the TV camera into one image memory, data from the other image memory is read out and an image is displayed. In the next frame period, the roles of the write image memory and the read image memory are switched. At this time, the logic of the address data is also reversed.

Reversing the logic of the address data means, for example, counting down the data that was being counted and amplified, and corresponds to scanning the display data in the opposite direction.

[Effect]

Therefore, when reversing the display image in the vertical direction, the logic of the address data indicating the vertical position may be inverted every frame, while the logic of the address data indicating the horizontal position may be kept constant.

When reversing the horizontal direction of the displayed image, conversely, the logic of the address data indicating the horizontal position is inverted every frame, while the logic of the address data indicating the vertical position is kept constant.

Furthermore, when the display image is to be reversed in both the vertical and horizontal directions, both address data are reversed.

Here, the address where the data of the center position of the image is stored is $8.
0 and $7F, even if the logic is inverted, the image position will shift significantly unless it is kept almost the same value.

Furthermore, since the image memory is provided for two screens, and each operates exclusively for storage or display during one frame period, the disturbance of the displayed image that occurs when data is rewritten does not occur.

〔Example〕

FIG. 1 shows an interlaced image display device according to an embodiment of the present invention. The image is flipped both vertically and horizontally. T
The analog output of the V-camera 14 is digitized by the A/D converter 13 and passed through the data buffer 1o to the image memory 7 or.

The images are input to image memories 2...8. Image memory A...
7 or image memory B...8 is passed through a data output puffer 9, converted into an analog signal by a D/A converter 11, and sent to a CRT 12 to be displayed as an image.

The odd/even field discriminator 1 controls which image memory the A/D converted data is written into and which part of the data in one image memory is read out and displayed. The upper address counter 3 is set to initial data 2 at each VD (vertical synchronization signal) timing, and is set to I-ID (
(horizontal synchronization signal). The lower address counter 4 is set to initial data 2 at each HD timing, and is counted up at each CLK (A/D conversion timing). Address buffers 5 and 6 reverse the logic of address data every cycle (one frame cycle) obtained by dividing the frequency of odd/even field discriminator 1 by 1/2.

The data buffers 9 and 10 switch between a storage destination memory for input data and a source memory for output data every frame.

FIG. 2 shows changes in the input/output status of each area of the image memory. By having image memory for two screens, image memories A and B, during the frame period when one is inputting, the other outputs, and in the next frame, the input/output state is reversed and the data input first is output. This makes it possible to invert the image with a delay of one frame time without causing the screen to flicker due to input/output conflicts.

FIG. 3 shows the relationship between the scanning order of output images of the TV camera and the data position on the image memory. Here, the numbers indicating the addresses are written starting from 1 to make the order clear. In reality, settings are made so that the center position of the image does not shift when the logic is reversed.

Figure 4 shows the output image of the TV camera (a) when only the lower address data is logically inverted (b), when only the upper address data is logically inverted (C), and when both address data are logically inverted (d). ) indicates the image display position.

In FIG. 1, in the case of a non-interlaced system, the odd/even field discriminator 1 is not necessary.

FIG. 5 shows the relationship of display positions when one image is reversed in the vertical direction in the case of a non-interlaced system. (a) shows before inversion, and (b) shows after inversion.

〔Effect of the invention〕

According to the present invention, it is possible to flip an image vertically or horizontally without changing the optical path, by simply controlling the logic of the address data of the image memory, without flickering on the screen, and with a delay of one frame time. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing changes over time in the input/output state of the image memories A and B in FIG. 1, and FIG. 3(a) is a diagram showing the TV in FIG. Figure 3(b) is a diagram showing the relationship between the scanning order of the camera output image and the data position on image memory A. Figure 3(b) is a diagram showing the relationship in the case of non-interlace.
The figure shows the image display position when the logic of each address data is reversed for the output image of the TV camera, and Figure 5 shows the positional relationship when one image is reversed vertically using the non-increment method. It is a diagram. 1... Odd/even field discriminator, 3... Upper address counter, 4... Lower address counter, 5...
- Positive logic address buffer, 6... Negative logic address buffer, 7, 8... Image memory, 9... Data output buffer, 10... Data manual buffer.

Claims (1)

[Claims] 1. A TV camera that images an object, an image that A/D converts its output and stores as image data, a memory, an address control unit of the image memory, and a readout and display of the data of the image memory. In an image display device having a portion that
An image display device having an image memory for a plurality of screens, and having address data in the image memory whose logic is reversed when writing and reading data. 2. The image memory according to claim 1, wherein the address data is divided into two parts, one part indicating the vertical position of the displayed image and the other part indicating the horizontal position of the displayed image. Device. 3. In the method for writing and reading data to and from an image memory according to claim 1, when the display device is of an interlaced type, data is written in the order of odd fields and even fields in a certain frame period, and even fields are displayed in the frame period. An image display device characterized in that data is read out in the order of field data and odd field data. 4. The image memory according to claim 1, which has image memories for two screens, and at a time when one image memory is storing data, the other image memory is operating for display. An image display device characterized by: 5. Regarding the address data control method according to claim 1,
An address control method characterized by making the address data of the image memory of each screen common. 6. Regarding the address data control method according to claim 1,
An address control method characterized by reversing the logic of address data every frame period. 7. In the address data according to claim 2, when the display image is reversed in the vertical direction, only the address data indicating the vertical direction is reversed, and when the display image is reversed in the horizontal direction, only the address data indicating the horizontal direction is reversed. An address control method characterized by