JPS6138315Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device that can clearly detect a moving object in a received television image.

A small moving object with a uniform background can be easily identified in an image, but images of the same moving object with a complex background, such as bacteria in a microscopic image or a photograph of a ship on the ocean, Discrimination becomes difficult. That is, the second
A in the figure shows the trajectory of the moving object, which is the third
It would be ideal if there were only moving objects as shown in the figure.

In order to achieve this purpose, it is sufficient to correlate the images at regular intervals and create an image that emphasizes only the uncorrelated parts (i.e. moving object parts), but the gradation and number of picture elements of each picture element Considering this, a huge amount of high-speed read/write memory is required, making it complicated and expensive.

In addition, instead of such a pixel memory, there is a method, as in U.S. Patent No. 3,051,947, in which signals to be correlated are stored in two storage tubes to obtain electrically correlated outputs and displayed, but in any case, It still requires two expensive and complicated storage elements.

There is also a method, such as a subtraction device, in which two image signals are mixed and erased using a mixing amplification circuit to display only the different parts, but even if this is applied to the above purpose, the previous one-screen signal It requires a memory similar to the above-mentioned memory or an alternative storage means such as a video storage tube for storing the information, and cannot be constructed at low cost.

The present invention provides a simple device that can achieve the same effect without using such memory means, and will be described in detail below.

If the signal of one scanning line in the part shown in FIG. 2B is taken out, the result will be as shown in FIG. 5A. Signal 1' in FIG. 5A indicates that the moving object A in the image of FIG. 2 is in the same scanning line.

The signal in the scanning line of the next frame at the same position in FIG. 2B should be exactly the same as in FIG. 5A, but depending on the moving speed of the moving object A in FIG. ' changes or ceases to exist.

Now, if the entire video signal in Figure 2 is switched frame by frame to a positive polarity video signal and a reverse polarity video signal whose phase is inverted and displayed as a brightness signal on the picture tube, the video will be averaged by the human eye and the entire image will be Although the brightness appears to be the same halftone, the part of the moving object shown in Figure 2A remains uncancelled as shown in the signals in Figure 5 A and B, and to the human eye it appears as shown in Figure 3. The static image disappears and only the moving object is visible.

Furthermore, depending on the speed of the moving object, it may be effective to invert the phase of the video signal for each field or scanning line instead of inverting the phase for each frame. However, in this case, images of objects other than the moving object are not completely canceled out, as shown in FIG. 4, for example.

FIG. 1 shows an embodiment of the present invention, in which a video signal applied to a signal input terminal 1 is led to a control switching circuit 3 via a phase inversion circuit 2, and is also directly connected to the control switching circuit 3. The output of the vertical deflection signal circuit 7 is led to the deflection yoke 5 and is also connected to a changeover switch 9 and a 1/2 frequency divider 8. Further, the output of the horizontal deflection signal circuit 6 is also connected to the deflection yoke 5 and the changeover switch 9. These selector switches 9
Among the signals switched by , the output of the 1/2 frequency divider 8 becomes a switching control period signal for each frame, the output of the vertical deflection signal circuit 7 becomes a switching control period signal for each field, and the output of the horizontal deflection signal circuit 6 becomes a switching control period signal for each field. The output becomes a switching control period signal for each scanning line, and becomes a control signal for the switching period of the control switching circuit 3.

The positive polarity video signal and the phase-inverted video signal are switched by the control switching circuit 3 for each frame, field, or scanning line selected by the changeover switch 9, and are applied to the picture tube 4 as a luminance control signal.
The brightness of the moving object is inverted for each image (collectively referred to as "screen element") and displayed, and for example, the signal of the image portion of a stationary object is distributed alternately between light and dark, with the same position lit up in white this time and darkened the next time, and so the brightness is mixed and neutralized to the human eye, and the image of the stationary object becomes unclear. On the other hand, the moving object is also inverted in the same way, but since the position is moving, the position of light and dark is different each time, and to the human eye it appears as different positions flickering and moving alternately with light and dark, making it possible to clearly detect the presence of a moving object. Specifically, as shown in Figure 1, the inversion of each screen element can be switched between three types: frame, field, and scan line, so that the optimal one can be selected according to the speed of the moving object, providing even more convenience.

Furthermore, as explained above, the present invention provides a video display device that displays a moving image in a television video at high speed, without using a huge amount of memory, and with an inexpensive and simple configuration.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, FIGS. 2, 3, and 4 show video examples for explaining the present invention, and FIG. 5 shows video signal waveforms. 1...Signal input terminal, 2...Phase inversion circuit, 3
... Control switching circuit, 4 ... Picture tube, 5 ... Deflection yoke, 6 ... Horizontal deflection signal circuit, 7 ... Vertical deflection signal circuit, 8 ... 1/2 frequency divider, 9 ... Changeover switch.

Claims (1)

[Claims for Utility Model Registration] In a video display device that displays a moving object by providing a video signal including a display signal of the moving object as a picture tube brightness signal scanned by a vertical deflection signal and a horizontal deflection signal, a circuit that generates a positive polarity signal and a reverse polarity signal of the video signal; a switching circuit that switches between the positive polarity signal and the reverse polarity signal to provide the luminance signal; and a 1/2 frequency divided signal of the vertical deflection signal. and a control circuit that controls switching of the switching circuit using one of the vertical deflection signal, the horizontal signal, and the 1/2 frequency division signal. A mobile object video display device, characterized in that the displayed image of the mobile object can be identified by utilizing brightness/dark reversal in the displayed image and the characteristics of the human eye.