JPH04271680A - Multi-screen display system - Google Patents

Abstract

PURPOSE:To improve efficiency for the confirmation of a picture or a dubbing operation by shortening time to multi-screen display by detecting the presence/ absence of the picture in each track and storing picture signals when an automatic presearch function is activated. CONSTITUTION:When a power source is turned on and a video floppy disk 26 is loaded, an automatic presearch is executed, the signal level of 50 tracks in the video floppy disk is read out, the presence/absence of the picture signal is detected according to the level, and the information is transmitted to a main CPU 9. On the other hand, the video information of the track is stored in the prescribed address of a memory 37 after executing a reduction processing. Then, pictures for 50 tracks are stored in two fields. Thus, since the respective picture signals are stored simultaneously with the automatic presearch and displayed on a monitor according to a multi-screen display instruction, time till the multi-screen display can be shortened.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a method for simultaneously displaying a large number of playback images recorded on a video floppy on a display unit, and more specifically, a multi-screen that can be used when editing images taken with an electronic still camera. Regarding the display method.

0002

[Background Art] In order to display images taken with an electronic still camera on multiple screens, it is necessary to temporarily store the recorded contents of the video floppy in memory and process the video signal so that a predetermined number of images can be displayed on one screen. . In such cases, a multi-screen switch is provided, and by turning on this switch, the image signals of each recorded track are stored. Conventionally, electronic still cameras and playback devices have been equipped with an auto presearch function. For example, when an electronic still camera is connected to a device with a playback circuit and a captured image is played back, auto presearch is performed first. After that, you will operate the multi-screen switch mentioned above.

0003

[Problem to be Solved by the Invention] Therefore, it takes a long time to obtain a multi-display screen of reproduced images of a video floppy. FIG. 3 is a flowchart for explaining the operational process up to the conventional multi-screen display. When the power switch is turned on, it is determined whether or not a video floppy is installed (steps 1 and 2), and if it is not installed, a warning process is performed. If it is installed, proceed to auto pre-search. In the auto pre-search, it is first determined whether up to 50 tracks of the video floppy have been scanned (step 3), and if the 50 tracks have not been reached yet, the head is moved to the next track (step 4). Then, the presence or absence of an image signal is detected by reading the signal level of the moved track (step 5), and the information is sent to the main CPU (step 6). Once information on the presence or absence of an image signal is obtained for one track, the process returns to step 3 and it is determined whether or not up to 50 tracks have been scanned again. By repeating such operations, the main CPU can know the presence or absence of an image signal for each track.

[0004] When information on the presence or absence of image signals is obtained for all 50 tracks, the auto presearch operation ends. Then, it is determined whether the multi-screen switch is turned on (step 7). If it is not turned on, it is assumed that multi-screen display has not been instructed and the process shifts to other controls. If the multi-screen switch is on, image signals are read from the tracks containing image signals based on the above information, subjected to video processing to reduce the screen, and stored in the memory in order (step 8). When all the image signals from the tracks with image signals are stored in the memory, multi-screen display is performed on the display section (step 9). As mentioned above, after auto pre-search, video processing is performed and stored in memory, and the contents are displayed for multi-display, which poses a problem in that it hinders the confirmation of each image and the efficiency of dubbing work. Ta. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the conventional method, and to provide a multi-screen display method that shortens the time required to display a multi-screen.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the multi-screen display method according to the present invention performs image reduction processing on the image signals recorded on each track of a video floppy and stores them in a memory. In the multi-screen display method that displays multiple images simultaneously on the display,
When the auto presearch function is activated, it sequentially scans all tracks on the video floppy of the player to detect the presence or absence of an image signal, collects information on the presence or absence of an image signal for each track, and When the track is scanned, the contents of the track are simultaneously read out, stored in the memory in association with the track number, and multi-displayed on the display section.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below with reference to the drawings and the like. FIG. 1 is a block diagram showing an embodiment of a circuit of a playback machine and a recorder employing a multi-screen display method according to the present invention. This embodiment can be configured by connecting a video floppy recording/playback device equipped with one floppy disk drive or an electronic still camera having only a recording function.
For the playback machine, only the circuit parts related to playback processing, multi-screen processing, and character control are shown, and for the recorder, only the circuit parts related to recording are shown. Alternatively, the circuit as in the embodiment can be constructed by setting one of the floppy disk drives in a playback mode and the other in a recording mode in a video floppy recording/playback apparatus equipped with two floppy disk drives.

Servo circuits 8 and 14, drive circuits 4 and 16, and motors 3 and 17 are circuits related to the floppy disk drive on both the playback and recording sides.
, head drive circuits 1 and 18, and PG pickup sensors 24 and 25. The servo circuit 8 sends a control signal to the drive circuit 4 based on the synchronization signal from the synchronization signal separation circuit 7. The drive circuit 4 drives the motor 3 to rotate the video floppy 26. Servo circuit 8 is video floppy 2
A PG signal sent from the PG pickup sensor 24 as the video floppy disk 6 rotates is obtained, and the drive circuit 4 is driven so that the video floppy rotates at a predetermined rotation and phase. . Recording side servo circuit 14, drive circuit 16, motor 17
A loop circuit consisting of the PG pickup sensor 25 also operates to be synchronized with the reproduction side drive section.

The head drive circuit 1 drives the head 28,
It is positioned on the tracks 1 to 50 of the video floppy 26 to be played back. Similarly, the head drive circuit 18 positions the head 29 on the 1st to 50th tracks of the video floppy 27 to be recorded. Servo circuit 8
The head drive circuit 1 is activated by a command from the main CPU 9, while the servo circuit 14 and the head drive circuit 18 are activated by a command from the sub CPU 15. The main CPU 9 and sub CPU 15 exchange information necessary for dubbing control.

On the reproduction side, when the floppy disk drive is driven and the head 28 is positioned on a predetermined track,
The FM modulated baseband video signal is read out by the RF signal reproducing circuit 2. This FM-modulated baseband video signal is corrected for distortion etc. by the dubbing circuit 5 and sent to the recording circuit 13 on the recording side. Recording circuit 1
3 records this FM modulated baseband video signal on a predetermined empty track of a video floppy 27 which is rotated synchronously.

The RF signal (FM-modulated baseband video signal) output from the RF signal reproducing circuit 2 is simultaneously sent to the video signal processing circuit 6 and demodulated into a baseband video signal. This baseband video signal is supplied to the monitor 21 via the synchronization signal separation circuit 7, the changeover switch 48, and the video output terminal. The dubbed video can be checked on the monitor 21. The synchronization signal separation circuit 7 separates the synchronization signal from the baseband video signal and sends the separated synchronization signal to the above-mentioned servo circuits 8 and 14.

Chroma decoder 32, memory controller 33, A/D converters 34, 35 and 36, memory 37
, D/A converters 38, 39, and 40, a chroma encoder 41, and a MIX circuit 42 are circuits for reducing and multiplying images for multi-screen display. Further, a circuit section consisting of a command decoder 43, a timing generator 44, a character generator 45, and a display control section 46 is a circuit for controlling insertion of characters on the screen. The color signal C and luminance signal Y output from the video signal processing circuit 6 are input to the chroma decoder 32, where the color signals are converted into color difference signals RY and BY. The purpose of converting the color signal C into a color difference signal is to maintain the phase continuity of the color carrier wave.

The memory controller 33 is a synchronous separation circuit 7
The color difference signals R-Y, B-Y and the luminance signal Y are converted to A/D converters 34 and 35 according to the timing of the synchronization signal from
and 36, respectively, into digital signals. Then, the digital signals of the color difference signals R-Y, B-Y and the luminance signal Y are processed so that one screen is reduced to an area ratio of 1/25, and the address signal is stored in the memory 37 (consisting of 2 fields). The reduced digital signal is stored in the address space. Vertical reduction in the reduction processing operation thins out the scan line frequency, and reduces the frequency by 1 every 5 lines.
This is done by repeating the operation of taking in the digital signal of one line and discarding the digital signal of the other four lines. Further, reduction in the horizontal direction is performed by thinning out the sampling frequency and repeating the acquisition and discarding of digital signals in the same way as in the vertical direction. In this way, 25 images from tracks 1 to 25 are stored in one field's memory, and the remaining 2 images are stored in other field memories.
25 reduced images of 6 to 50 tracks are stored.

When there is a multi-screen read instruction, an address signal is given from the memory controller 33 to the memory 37 to read each image, and the digital signal of each read image is sent to the D/A converter 38, 39 and 40, the color difference signals R-Y, B-Y and the luminance signal Y are converted into analog signals. Then, the color difference signals RY, B
-Y is converted into a color signal by the chroma encoder 41, and then mixed with the luminance signal Y from the D/A converter 40 in the MIX circuit 42. At this stage, a reduced image video signal is obtained, and a multi-screen video signal for 25 images is output to the MIX circuit 42.

On the other hand, when displaying characters, etc. on each image on a multi-screen, the main CPU 9 sends a command to the command decoder 43.
A command to that effect is sent. Command decoder 4
3 decodes the command and distributes the decoded data to the timing generator 44, character generator 45, and display control section 46. The character generator 45 is a memory that stores each character pattern, and reads out the corresponding character pattern based on the character code sent from the command decoder 43. The display control unit 46 displays the characters read out from the character generator 45 based on the control signal sent from the command decoder 43, suppresses the display, frames the characters, or causes them to blink. control. The timing generator 44 generates a timing signal for inserting the character pattern output from the display control unit 46 into each image (25 images) of the multi-screen using the synchronization signal and the signal from the command decoder 43.
The signal is sent to the X circuit 47.

Each reduced image that is multi-outputted by the operation of the command decoder 43 and the like is sent to the MIX circuit 47.
It is mixed with the character pattern signal at MIX circuit 4
The multi-screen of each reduced image mixed in step 7 is switch 48.
and is displayed on the monitor 21 via the video output terminal. The next 25 images from the 26th to the 50th track can be displayed on the monitor 21 in the same manner.

The main CPU 9 keys include a forward key 10a for forwarding the track on the playback side, a reverse key 10b for returning the track on the playback side in the opposite direction, and a predetermined track on the floppy disk for the playback side and the recording side. A dubbing key 10 for dubbing signals when each head is located on an unrecorded track of a floppy disk.
c. Cursor key 10d used for specifying a frame in multi-screen display, record key 10e for specifying recording mode, empty key 10f for skipping one track, key 10g for instructing multi-screen display, etc. A key input circuit 10 provided with keys is connected thereto. The main CPU 9 performs various processes in accordance with input instructions from the key input circuit 10.

The driving portions of the video floppies 26 and 27 are provided with floppy presence/absence detection sections 11 and 19 and an erroneous erase/break detection section (not shown). The floppy presence/absence detectors 11 and 19 are switches, etc. for detecting whether or not the video floppies 26 and 27 are installed. When the video floppies 26 and 27 are installed, the switches, etc. are turned on and the information is displayed. Main C
The PU 9 or sub CPU 15 is notified. The erroneous erasure nail break detection section is for detecting whether or not the inserted video floppy has a broken nail. If the nail is broken, the detection signal is sent to the main CPU 9 or sub CPU 15 to prevent accidental erasure. Therefore, recording is blocked.

Next, the procedure of the multi-screen display method according to the present invention will be explained using FIG. When the power switch is turned on, it is determined whether or not a video floppy is installed (steps 1 and 2), and if it is not installed, a warning process is performed. If it is installed, the process moves to auto pre-search using the invented method. In the auto pre-search, it is first determined whether up to 50 tracks of the video floppy have been scanned (step 3), and if the 50 tracks have not been reached yet, the head is moved to the next track (step 4). Then, the presence or absence of an image signal is detected by reading out the signal level of the moved track, and at the same time, the image signal of that track (no signal if it is not recorded) is read out, reduced, and stored at a predetermined address in the memory 37. (Step 5). Information on the presence or absence of the image signal is sent to the main CPU (step 6). After obtaining information on the presence or absence of an image signal for one track and storing the reduced image signal in the memory 37, the process returns to step 3 and it is determined whether or not up to 50 tracks have been scanned again.

By repeating the above operations in this manner, the main CPU learns the presence or absence of an image signal for each track, and at the same time stores images for a total of 50 tracks, 25 tracks each, in two fields of the memory 37. When the storage operation for all tracks is completed, it is determined whether the multi-screen display key 10g is pressed (step 7). If it is not pressed, it is assumed that multi-screen display has not been instructed and the process shifts to other controls. When the multi-screen display key 10g is pressed, the address for one field is sent out, and the multi-screen for 25 images of tracks 1 to 25 is read out from the memory 37 and displayed on the monitor 21. Next, when the multi-screen display key 10g is pressed again, the address of the next field is sent out 26
~Monitor 21 multi-screen of 25 images of 50 tracks
(Step 8).

[0020]

[Effects of the Invention] As explained above, the multi-screen display method according to the present invention stores each image signal at the same time as auto presearch, and is configured to display it on the monitor according to a multi-screen display instruction. This has the effect that the time required for multi-screen display can be significantly shortened compared to the previous version, and image confirmation and dubbing on the video floppy can be performed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing an embodiment of a playback device and a recording device that employ a multi-screen display method according to the present invention.

FIG. 2 is a flowchart for explaining the method of the present invention.

FIG. 3 is a flowchart for explaining a conventional multi-screen display method.

[Explanation of symbols]

1...Head drive circuit 2...RF signal regeneration circuit 3...Motor 4...Drive circuit 5...Dubbing circuit 6...Video signal processing circuit 7...Synchronization signal separation circuit 8...Servo circuit 9...Main CPU 10...Key input circuit 10g…Multi-screen display key 15...Sub CPU 21...Monitor 32...Chroma decoder 37...Memory 42, 47...MIX circuit 46...Display control section

Claims (1)

[Claims] Claim 1: In a multi-screen display system in which a large number of images are simultaneously displayed on a display unit by performing image reduction processing on image signals recorded on each track of a video floppy and storing them in memory, an automatic pre-search method is used. When the function is activated, all the tracks of the video floppy of the player are sequentially scanned to detect the presence or absence of an image signal, the information of the presence or absence of an image signal is collected for each track, and each of the tracks is scanned. A multi-screen display method characterized in that the contents of the tracks are simultaneously read out and stored in the memory in association with the track number, and are displayed in multiple ways on a display section.