JPH0260384A - Video display system - Google Patents

Abstract

PURPOSE:To prevent pictures on a multiscreen from being unsightly by providing a means which performs such control that the number of video frames is practically larger than a prescribed value on the multiscreen. CONSTITUTION:A desired SVF 2 is loaded to a still video reproducing machine 1 to record and reproduce information, and reproduced information is displayed as a picture on a monitor 4 connected to the reproducing machine 1 by a cable 3. A reproducing push button switch 5, a multiscreen push button switch 6, a plus key push button switch 7, a minus key push button switch 8, etc., are arranged for the control on the front panel of the reproducing machine 1. In this constitution, picture information is displayed with a single screen on the monitor 4 at the time of depressing the switch 5, and picture information is displayed with the multiscreen at the time of depressing the switch 6. When information is displayed with the multiscreen, following pictures are displayed with the multiscreen at the time of depressing the switch 7, and just preceding pictures are displayed with the multiscreen at the time of depressing the switch 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video display system, specifically, to display recorded information read from an erasable recording medium such as a 5VF (still video floppy) on a multi-screen display on a monitor. The present invention relates to a video display system for displaying images.

[Prior Art] SVF, in which a flexible magnetic disk sheet is rotatably housed in a rectangular thin housing, is widely used as a magnetic recording medium for recording and reproducing still image information captured by electronic still cameras. has been done. This magnetic recording medium is
Image information is recorded concentrically on the magnetic surface of a magnetic disk based on a flexible thin circular plastic film by a recording/reproducing magnetic head that moves radially using a head access mechanism. There is. When recording image information with an electronic still camera, a maximum of 50 concentric recording tracks are formed at equal intervals.

To read information stored on a magnetic recording medium in this way, the access mechanism operates in response to an access signal that specifies a track number issued from the system controller, and causes the magnetic head to access the specified track. The information stored therein is read out and the reproduced image is displayed on the display of the monitor device.

The reproduced image can be displayed on a single screen in which the signal of one field stored in one track is displayed on one screen, or if multiple tracks are specified, the reproduced image signal of each track is stored in the field memory. Once stored,
These are displayed simultaneously on a plurality of screens divided into squares on the display, so-called multi-screen display.

In this way, if the image information played from multiple tracks is displayed simultaneously as a multi-screen, it is convenient for use in searches, etc., and the display screen can be used effectively without wasting it, and all screens can always be divided. Since it is displayed, it has the advantage that the context of the image is clear.

Figure 5 shows each side of a conventional screen display.
Figure (A) shows the case where the video information recorded in track number 1 is read out and displayed as a single screen on the display of the monitor device, and Figures 5 (B) to (G) show the case where the video information recorded in track number 1 to 50 is recorded. Each of the figures shows a case where video information is read out and displayed on the display of the monitor device as a multi-screen of 4 columns x 4 rows = 16 sections. The multi-screen display first displays the recorded information of track numbers 1 to 16 as a multi-screen as shown in FIG.
Track numbers 17 to 32 are displayed as shown in C). Furthermore, if you press the plus key, a multi-screen with track numbers 33 to 48 will appear as shown in Figure 5 (D), and if you press the plus key again, the screen will display as shown in Figure 5 (E).
As shown in the figure, the remaining four track numbers and 50 are displayed, and the other 14 screens become multi-screens scattered due to noise and the like.

[Problem to be solved by the invention] As described above, in the conventional video display system in which recorded information stored in each track of a magnetic recording medium is sequentially displayed as a multi-screen by operating the plus key, the recorded information is stored in the last track. The multi-screen displaying recorded information is shown in Figure 5 (
As shown in E), the actual number of frames of the video is less than the number of displayable frames. In other words, in a multi-screen that includes recorded information from the last track, a large number of divided frames with no video information are generated, and noise and the like are superimposed on these useless frames, making the screen very unsightly.

An object of the present invention is to ensure that the actual number of video frames is always greater than or equal to a predetermined number on each multi-screen that is gradually updated, so that the multi-screen that displays recorded information from the last track does not become an unsightly screen that contains noise. The purpose of the present invention is to provide a video display system that can be controlled to achieve the desired results.

[Means for Solving the Problems] The video display system of the present invention displays each sequential video based on sequential video information read from a plurality of sequential recording areas set in an applied recording medium on the monitor screen. The above-mentioned video display system is capable of forming a signal for displaying a multi-screen display divided into a plurality of predetermined sections by gradually updating the screen display, the system comprising: The present invention is characterized by comprising means for controlling the sequential images so that the actual number of frames of the images is always equal to or greater than a predetermined number in each of the 7 multi-screen displays that are gradually updated.

[Function] In the case of a multi-screen that includes recording information from the last track,
As shown in FIG. 5(P), in order to end with the recording area 50, the recording area is started from the area 35. Therefore, if you press the minus key (described later) on the multi-screen shown in FIG. 5(P), the screen shown in FIG. 5(G) will appear.
Recording areas 19 to 34 are now displayed as shown in FIG.

[Example] The present invention will be specifically described below with reference to the drawings. Third
Figure (A) is a perspective view of each component device of a video display system showing one embodiment of the present invention. In the figure, a desired 5VF 2 is loaded into a still video playback device 1, the recorded information is played back, and the playback information is displayed as an image on a monitor 4 consisting of a display device connected to the playback device 1 through a cable 3. It has become. On the front panel of the player 1, there are various operation buttons.
5. Push button switch for PLAY). Four pushbutton switches are provided: a pushbutton switch 6 for MULTl, a pushbutton switch 7 for the plus key, and a pushbutton switch 8 for the minus key.

When the playback push button switch 5 is pressed, the image information displayed on the monitor 4 becomes a single screen, and when the multi push button switch 6 is pressed, the image information displayed on the monitor 4 becomes a multi screen.

In this multi-screen, pressing the push button switch 7, usually called the plus key, will take you to the next multi-screen in the plus direction, and pressing the push button switch 8, usually called the minus key, will take you to the previous multi-screen in the minus direction. Multiple screens are displayed individually. That is, when the plus key is pressed, the multi-screen shown in FIG. 5(B) changes to the multi-screen shown in FIG. 5(C), or from the multi-screen shown in FIG. 5(C) to FIG. ) The image display on the monitor will change to the multi-screen shown in Figure 5 (P), and when the minus key is pressed, the multi-screen shown in Figure 5 (P) will change to the multi-screen shown in Figure 5 (G). The image display on the monitor changes from the multi-screen shown in FIG. 5(D) to the multi-screen shown in FIG. 5(C).

FIG. 4 is a block diagram showing the configuration of the reproduction system of the video display system of this embodiment. In the figure, when the system controller 27 instructs the desired track number to be reproduced on the magnetic recording medium 1, the head access means 28 operates to move the magnetic head 11a to the relevant position and record data on the designated track. The image information signal is read out and the image information signal is supplied to the head amplifier 12. The video signal amplified by this head amplifier 12 is
The /C separation circuit separates the signal into a luminance signal Y and a chroma signal C.

Then, the luminance signal Y is FM demodulated by the demodulator 13a,
The signal is converted into a digital signal by the A/D converter 14a, the signal waveform is processed by the process circuit 15a, and then applied to the analog switches 22a and 22c. Similarly to the luminance signal Y, the demodulator 13b, A/D converter 14b,
Analog switch 22b via process circuit 15b,
22d.

A field memory 17a is provided between the analog switches 22a and 22c, and a field memory 17a is provided between the analog switches 22a and 22c.
, 22d, and a field memory 17b is connected between each of the analog switches 22a to 22d, and each control input terminal Ci of the analog switches 22a to 22d is set to "H" only when a head access is made to erase recorded information on the magnetic recording medium 11. ”
The control voltage Cont, which is at the "L" level during normal use, is applied from the system controller 27. That is, the field memory 17a
, 17b are inserted into a circuit composed of terminals of analog switches 22a to 22d, so that the image reproduction outputs of the process circuits 15a to 15b are temporarily stored in the field memory 7a17b. The field memories 17a and 17b are formed of nonvolatile fixed memories and have a memory capacity capable of storing one frame of image information.

Assume that the multi-screen is composed of N horizontally and N vertically, that is, N2 unit screens reproduced from N2 recording areas. Field memory 1 above
The peripheral circuits 7a and 17b sample each video signal of N2 unit screens to be 1/N of the original video signal in each scan in the horizontal direction and vertical direction, and then output this video signal. The above field memory 17a is arranged in a manner similar to the multi-screen on the monitor.
Store in 17b. By reading out the image information stored in this manner in synchronization with the scanning of the monitor, a multi-screen of N2 frames formed of N2 unit screens is realized.

The signals recorded in the field memories 17a and 17b are read out at appropriate timing and sent to the D/A converter 18.
After being returned to the analog quantity at a and 18b, the encoder 19
synchronization signals, burst signals, etc. (-
1 and formed into a composite color video signal of the NTSC system, for example, and supplied to a monitor device (not shown).

In the video display system of this embodiment configured in this way, when displaying a multi-screen divided into a certain number of sections, if the multi-screen includes a unit screen reproduced from the recorded information of the last track. As shown in the flowchart of FIG. 2, the first address in the same multi-screen is traced back.

In other words, by using a multi-screen in which each track number of N2 frames is consecutive, formed from N unit screens horizontally and N vertically, for example, 50 tracks can be selected while pressing the plus key. The starting track number when sequentially displaying the tracks including the unrecorded tracks is determined as follows.

1) Add the number of frames N2 of the multi-screen to the first track number on the multi-screen before pressing the plus key, and use this as the first track number of the next screen.

2) When the first track number of the next screen is determined in this way, the problem is what to do when the last track number exceeds 50. In other words, if the number of the last track exceeds 50, it means that the number of the first track is (
50-N2+1). Therefore, the first track number of the next screen is compared with (50-N2+1) to determine whether it is larger or smaller.

3) If the first track number on the next screen does not exceed (50-N2+1), the process ends and (50-N" +1)
), set the first track number to (50-N2+1) so that the final track number on the next screen is 50.
Assign this to end this flow.

To explain the above matters by applying specific numerical values to Fig. 5(D), there are 4 tracks in the horizontal direction and 4 tracks in the vertical direction.
Unit screens from 3 to 48 are arranged. Therefore,
Find the final track number on the next screen: 480N2〉50
It becomes.

Therefore, the first track number on the next screen is (50N2+1)
-35, as shown in Figure 5 (F), the first track number is 35 and the last track number is 50, and the actual number of video frames matches the number of displayable frames, that is, there are no unnecessary unit screens. It turns out that it doesn't exist.

Therefore, the system controller 27 performs head access to track numbers 35 to 50 of the magnetic recording medium 11.
Sequential field memory 17a.

Store in 17b. When the storage is completed, the memory contents of the field memories 17a and 17b are read out and displayed on the monitor as a multi-screen.

In the above description, the number of tracks on the magnetic recording medium 11 is 50.
Assuming that the recorded contents of each track are N2 (N=2.
We have explained an example of displaying an image on the monitor as a multi-screen with the number of frames of 3, 4.5), but the number of tracks is 50.
It is also possible to control the actual number of video frames so that it always exceeds a predetermined number, from the perspective of clarifying the context of recorded information stored in a certain track without being influenced by .

As an example, in FIG. 5(E), the number of displayable frames is 1.
6, the actual number of frames that display the video is only two frames with track numbers 49 and 50, but if the first track number of the multi-screen exceeds a certain number, a certain number is subtracted from the first track number and the number is forcibly displayed. A flowchart for increasing the number of tracks in a multi-screen is shown in FIG. In the figure, a comparison is made to see if the first track number of the next screen is greater than a certain number m. Then, if it is larger, a certain number g is subtracted from the first track number and used as the new first track number, and if it is not larger, the process ends as is.

By the way, in the explanation of the above embodiment, it is assumed that recorded information is stored in all the divided frames in the multi-screen, but in this case, there is an unrecorded unit screen with no information recorded therein. In some cases, this screen becomes a noise screen, which is very unsightly. Therefore, by replacing this unit screen with a single color screen such as blue, an easy-to-read multi-screen can be created.

[Effects of the Invention] As described above, according to the present invention, when displaying multiple frames of video on a multi-screen, the images are not lost as mutually related image information in any multi-screen each time. A remarkable effect is achieved.

[Brief explanation of the drawing]

FIG. 1 is a flowchart for controlling the video display system of the present invention so that the actual number of video frames always exceeds a predetermined number during multi-screen display. FIG. 3(A) is a flowchart for controlling the actual number of video frames to be equal to the number of multi-displayable frames when performing multi-screen display of 50 tracks in the video display system showing the embodiment. FIG. 4 is a perspective view showing the configuration of the video display system according to the above embodiment, in which (B) is a front view of a push button switch arranged on the front panel of the playback machine shown in (A) above; Block diagrams showing the configuration of the playback system of such a video display system, FIGS. 5(A) to 5(G) show each side of the screen display, where (A) shows a single screen display, and (B) shows a single screen display. -(G) are front views showing multi-screen displays, respectively. 11...Magnetic recording medium (recording medium) 17a,
17b...Field memory (controlling means)

Claims (1)

[Claims] (1) Each sequential video based on sequential video information read from a plurality of sequential recording areas set on the applied recording medium is displayed on a multi-screen divided into a certain number of sections on the monitor screen. A video display system capable of forming a signal for displaying images by gradually updating the screen display, wherein each of the above-mentioned sequential images is displayed on the multi-screen each time the screen display is updated gradually. 1. A video display system comprising means for controlling the actual number of video frames to always be a predetermined number or more during display.