JPH02263381A - Frame retrieving device - Google Patents

Abstract

PURPOSE:To improve the timing for fetch to a frame memory to improve the retrieval precision by providing a means which generates a retrieval frame number in accordance with a desired frame selected from plural frames stored in a frame memory. CONSTITUTION:A means 2 which rewrites the duty ratio of control pulses on the magnetic tape to set a reference point, a control means 11 which stores the video signal of plural continuous frames in a frame memory 7, a means 16 which counts the number of frames from the reference point to storage to the frame memory, a means which generates the retrieval frame number in accordance with the desired frame selected from plural frames stored in the frame memory, and a means which stores the video signal placed in the position of the retrieval frame number from the reference point in the frame memory 7 are provided. Thus, the video signal of the desired frame is surely retrieved with a high precision because an arbitrary frame of the reproduced video signal can be retrieved and extracted in the normal reproducing state without still reproducing of a VCR and is stored in the memory.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for obtaining a desired signal from a frame-by-frame video signal (picture signal) reproduced from a helical scan type magnetic recording and reproducing device using a rotary head, such as a video tape recorder. The present invention relates to a frame search device that searches for frames, and in particular,
The present invention relates to a frame search device suitable for use in addition to a video printer.

(Technical Background) In recent years, video printers that print and output images from video tape recorders (VTRs) and Allevision TVs (TVs) have been researched and developed, and have been commercialized. This video printer, as shown in FIG.
converts the video signal supplied by the
Data for one frame (consisting of two feeds) is temporarily stored in a frame memory. Next, data is sequentially read line by line from this frame memory (restored to analog signals), and an image for one screen is printed on recording paper by a printing means.

In other words, the video signal consists of 2 fields and 1 frame.
In other words, one screen is configured, the operating speed of the printing means is extremely slow compared to the transmission frequency of the video signal, and the video signal is a composite signal.
Separate into luminance component and color component, R required for printing,
As mentioned above, video printers are provided with a frame memory in order to generate G and B signals.

Then, while monitoring the continuously reproduced images (moving images), a desired frame was searched for, and the image was imported (as a still image) into the frame memory by operating a write switch or the like.

(Prior art and problems to be solved by the invention) As a frame search method, (a) Traditionally, in professional VTRs, a VHC signal (frame address signal) is added to the video signal and recorded, and during playback, the VITC signal The room search for images was performed using the address data obtained.

On the other hand, adding the above-mentioned VITC signal function to a consumer VTR used in a general home would increase the cost and therefore cannot be adopted.

Also, for the magnetic 1-wave that has already been recorded, V
Since it is necessary to add the ITC signal and re-record, it is time-consuming and the image deteriorates.

(b) It is also conceivable to search for a desired frame using playback methods such as so-called frame-by-frame forwarding and still playback. However, in images obtained by playback methods such as frame-by-frame or still, the inclination of the track during recording and the inclination of head scanning during playback are different, as is clear from the explanatory diagram shown in Figure 19. Therefore, only low-quality images containing noise can be obtained.

Therefore, a desired frame is searched for while monitoring a moving image obtained by normal playback, but the timing of importing the frame into the frame memory is difficult and the search viscosity is extremely poor.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a video signal in the middle of a frame reproduced by a helical scan type magnetic recording and reproducing device in which control pulses are recorded in the longitudinal direction of a magnetic tape. This is a frame search device that searches for a desired frame from a magnetic tape and stores it in a frame memory, and rewrites the duty ratio of the control pulse of the magnetic tape. 3
means for setting a reference point; control means for storing video signals of a plurality of consecutive frames in the frame memory; means for measuring the number of frames from the reference point to storage in the frame memory; and the frame memory. A frame search device comprising means for generating a search frame number from a desired frame selected from a plurality of frames stored in the frame memory, and means for storing a video signal of the search frame number from the reference point in the frame memory. This is what we provide.

(Embodiment) An embodiment of the frame search device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an example in which a frame search device is realized by a system controller and added to a video tape recorder.

First, the configuration of the frame search device will be explained.

Reference numeral 1 denotes a video recorder (hereinafter referred to as a VTR) equipped with a frame search device, in which video signals are recorded and played back on a magnetic tape using a well-known helical scan method, and audio signals and audio signals are recorded and reproduced in the longitudinal direction of the magnetic tape. Control signal 8 (control pulse) is recorded and reproduced. 2 is a Shumcomputer 1 to roller (for example, a microcomputer) that executes the operation of the frame search device;
(hereinafter referred to as the system controller), and the input port eT I
It has an output boat group Qn. When the mode switch Sm on the VTR 1 side switches from normal mode to frame search mode, the VTR 1 comes under the control of the system controller 2, and the control signal from the output port of the system controller 2 causes the VTR 1 to play, stop, rewind, and Perform operations such as fast forwarding and reverse playback (search). Furthermore, control pulses from the VTRI are input to pulse detection W3a, 3b, and the presence or absence of the control pulse (and duty ratio) is input to the system controller 2. Further, the control pulse of the V'r R1 is rewritten by the control signal of the system controller 2 (for example, the control pulse of the V'r R1 is rewritten).
When the VISS terminal and MARK terminal on the side are turned ON, a VISS signal (described later) is written.

On the other hand, the reproduced signal from the VTR 1 is input to the A/D converter 6 after passing through P, F (low pass filter >48.4b, mode switch 5).The A/D converter 6 digitizes the signal. The video signal is stored in (frame) memory 7.
D
The signal is input to the /A converter 9, converted into an analog signal again, and output to a monitor 10 and a printing device (not shown). 11
controls the writing and reading addresses of the memory 7 to display multiple screens of video signals (hereinafter, 3 vertically x 3 horizontally = 9
This is a (address) control circuit that creates a multi-screen (this will be explained by taking a multi-screen as an example).

The control circuit 11 includes a room pulse rp1 from a frame detector (V DET) 12 and a horizontal synchronizing pulse from a horizontal synchronizing signal separator (II 0ET) 13 generated by a PL1 circuit 14 during memory writing. A clock CK (a clock with a frequency corresponding to 4f when the color video carrier is r) and a horizontal pulse Hd are input.

In addition, the control circuit 11 includes a clock GK generated by the PLL circuit 14 and the frequency divider 16 based on a reference signal from the crystal oscillator 15 that is equal to the frequency of the horizontal synchronization signal, when reading the memory. A horizontal pulse 1''d and a frame pulse fp are respectively input. The clock CK is
A/D conversion Z6. It is also the clock for the D/A converter 9.

Note that the clocks for memory writing and reading are switched by switches 17a and 1 controlled by the system controller 2.
7b.

Further, the control signal for switching between the mono screen and multi-screen from the system controller 2 is output to the υIt11 circuit 11 and the changeover switch 5, and the screen switch 8 that switches between the video signal from the VTR 1 and the signal from the memory 7 is also controlled by the system controller 2. ing.

Furthermore, the system controller 2 includes a reference signal switch S+, a search switch 82, which will be described in detail later. A numerical input V-board K is connected. Further, the counter of the system controller 2 is configured to receive the output from the frame detector 12 and to be able to count the number of frame pulses.

Here, the control pulse of the VTR 1 will be explained.

FIG. 14 shows a helical scan type R magnetic tape format. A tilted video track 112 is formed on the magnetic tape 111, a fame track 113 is formed on the upper side in the longitudinal direction, and a fame track 113 is formed on the upper side in the longitudinal direction. A control track 114 is formed on the lower side.

Control pulses are recorded on the control track 114. As shown in FIG. 15, the control pulse is a 3QH7 pulse synchronized with the fall of the vertical synchronization signal of the input video signal, and is recorded on the magnetic chip 1111 at the same time as the video and audio signals. magnetic tape 111
When the control pulse is played back from the tape, the control pulse is also played back at the same time, and the rising edge of the pulse is detected and used for tape feeding phase control (servo control 1).

Furthermore, the duty ratio is changed according to the falling part of the control pulse as shown in FIG. , a control pulse with a duty ratio of 27.5% is used as one pulse pulse data, and is also used to insert data for locating the beginning of the magnetic tape 111.

As a (position) reference signal using such data, there is a VISS format as shown in FIG.

Note that a control pulse (that is, data "O") with a duty ratio of 60% has already been written in the control track on the magnetic "j-b" on which the video signal is recorded. Rewriting this control pulse is
While the rising part of the control pulse is regenerated and used for servo control, only the falling part of the control pulse is partially rewritten.

In other words, when the system controller 2 turns on the VISSO 5 and MARK terminals of the VTR 1, VISSO appears on the magnetic arc.
The signals are superimposed. The write signal to the magnetic head when this VISS signal is superimposed is input to the detector 3b as an RFC control pulse, and the output of the detector 3b causes the VI
The writing timing of the SS signal is sent to the system controller 2.

During normal playback, the control pulses demodulated by the VTR 1 are input manually to the detector 3a, and the output of the detector 3a provides data of "0" and "1" based on the number of control pulses and the duty ratio of the control pulses. The signal is sent to the system controller 2, and the VISS signal during normal playback is detected. ZARANI, VTR117) VISS DE
T7') 1 During rubber reverse playback 17) VISS signal detection pulse is sent to the system controller.

Note that when using the VISS signal as the reference signal, V
The entire ISS signal may be used, or only a portion of the VISS signal may be used.

In the control circuit 11 configured as described above, the control circuit 11 shown in FIG.
> and (B), the reading and writing to the memory 7 is performed at the timing shown in FIG. 3, and 9 as shown in FIG.
Full split multi-screen! J is done.

(Writing/reading in mono screen mode) In mono screen mode, the 4f clock GK is used as the writing/reading clock, and the count value of the horizontal synchronizing pulse Hd from the frame pulse and the horizontal synchronizing pulse H
Addresses are given sequentially according to the number of clocks GK from d, and write and read timings are equal, and
One frame (two fields) worth of data is written to and read from the memory 7.

(Writing during 9-split multi-screen) At this time, as shown in Figure 2 (△> and (B)), the writing clock is (1/3) 4f, and once every 3 water weight period signals. 2 due to the generated erroneous write timing signal.
Stores are stored in the memory 7 every other horizontal line. In the memory 5, the video signal from the VTR1 is thinned out by 1/3 in the horizontal and vertical directions, and in the order of the arrows (a 1-+ b + -+ 82-+ b
2-→a g -* b 9 ) Nine frames of continuous video signals are written into the memory 7 for one frame (two fields).

Note that when creating an mxn multi-screen, the write clock may be set to 1/m, and writing may be performed every -n-1 horizontal lines.

(Reading during 9-split multi-screen) As shown in Figure 3, with the readout clock set to 4f,
It is read out in the order of the arrows (1st line of a+ - + 1st line of a2 → 1st line of a3 → 2nd line of a1 ... final line of b9), and as shown in Figure 4 ( A multi-screen (from F+ to F9) is reproduced on the monitor 10.

[First Example] The operation of a frame search device having multi-screen output executed by the system controller 2 will be described.

FIG. 5 is a flowchart showing the operation by the system controller 2,
FIGS. 6A and 6B are diagrams showing the operation of the VTRI.

When entering the frame search mode, the VTR 1 starts normal playback (step 100). When the reference setting switch S1 is pressed, a W single signal is written on the control track of the magnetic tape, and counting of the number of frame pulses is started (steps 101, 102, and 103). At this time, the screen switch 8 is on the VTR side, and the playback screen from the VTR 1 is being sent onto the monitor 10 (step 104).
). When the operator f1 being monitored by the monitor 10 presses the search switch S2 near the desired search frame (step 1
05) The counting of the number of frame pulses stops and this value is set as A. Steps 106a and 106b) The nine consecutive frames (screens) immediately after the search switch S2 is pressed are written to the memory 7 and read out. is displayed on the monitor 10 as shown in FIG. 4 (steps 107a, 1
07b) The VTRI is stopped (step 108).

If there is a desired frame within the multi-screen on the monitor 10 (step 109), input the frame number QB from the keyboard K (step 110), as shown in FIG. 6(A), and this input value is Frame correction value. A search count value C (=A+8>) is calculated from the count value A and the input frame number B (step 111).

The VTR 1 is rewound (step 112), stops after the reference signal is detected, and starts normal playback (steps 113, 114). When the reference signal is detected again (step 115), counting of the number of frame pulses is started (step 116), and when the counted number of frame pulses reaches the search count value C (step 117),
One frame immediately after that is taken into the memory 7 as a mono screen (step 118), and the desired room is displayed on the monitor 10 and output to the printing device (step 119).

If the desired frame does not exist in the multi-screen on the monitor 10, step 109), as shown in FIG. (Step 120)
. Multiplying this value by 9 is the frame correction value, and from the frame correction value 9XD to the count value, search count value E
(=A→9×D) is subjected to it R (step 121).

VTR1 is rewound (step 122) and stops after the reference signal is detected to begin normal playback (steps 123 and 124). When the reference signal is detected again, start counting the number of frame pulses (step 125).
．． 126), when the number of frame pulses counted through the block 127 reaches the search count value E (step 128), the nine consecutive frames (screens) immediately after that are written to the memory 7 as a multi-screen. , the multi-screen is displayed on the monitor 10, and the A4
-E, and the VTR 1 stops (step 129a
, 129b, 129c, 130).

Returning again to step 109, it is determined whether the desired frame exists within the multi-screen on the monitor 10. If the desired frame does not exist, steps 120 to 130 are repeatedly executed.

Note that if the search switch S2 is pressed while counting the number of frame pulses in step 127, step 1 is executed.
06, a multi-screen is displayed at the timing when the search switch S2 is suppressed.

As described above, according to the present frame search device having multi-screen output, an arbitrary frame of a reproduced video signal of a VTR can be searched and extracted from the reproduction state without performing still reproduction of the VTR, and stored in the memory. SN because I can
You can obtain the desired single-frame video signal with a good ratio, and since you can display multiple frames on a multi-screen and select from among them, you can easily and quickly search for the desired room. .

Since a plurality of frames are displayed on multiple screens, the amount of memory used can be reduced relative to the number of frames, and costs and the number of parts can be reduced.

[Modification 1] In the first embodiment described above, since the search switch is pressed after viewing the desired frame, it is unlikely that the timing will be delayed and the desired frame will appear in the first multi-screen.

Therefore, as shown in FIGS. 7(A) and (B), steps 201a, 201b, 118b, 129c, and 129d are performed.
Add.

In the search mode, after recording the reference signal in steps 100 to 103, write the multi-screen to the memory 7 directly b1
(Step 2p1a>), repeats writing for 9 frames, ends the writing when the search switch S2 is pressed (Step 201b), and sets the 9 frames before the search switch S2 is pressed as a multi-screen. It may be displayed (step 107b).

Since the nine frames immediately before the search switch S2 is pressed are displayed as a multi-screen, the probability that a desired frame will be displayed on the multi-screen increases, and the search speed is dramatically improved.

[Modification 21 When reading a multi-screen written to the memory, if the divided memory next to the last divided memory immediately after the search switch S2 is pressed is read as the first address at the time of reading, for example, if the last memory is a4. b.

When , a5. If read from b5, Figures 9 (A) to (C
), the divided multi-images are displayed consecutively in chronological order, making it easier to search for frames. In other words, in the case of the above example, it is stored in the memory 7 as shown in FIG. 9(A), so at(b+)
When read in the order of →...→ag(bs), the same figure (B)
It becomes a multi-screen like this, and it is not continuous in chronological order,
a5 (b5) → a8 (bs) -+...-+a3 (t
)3)-a4 (1)4)→The same figure (C
), making it easy to search.

[Modification 3] Also, as shown in FIGS. 8A and 8B, if step 105b is added and 9 frames are written as one unit when writing to the memory, complex address control can be performed. It is possible to obtain nine consecutive screens in the same way as in the modification example without any trouble.

[Second Embodiment] In the first embodiment described above, it was necessary for the operator to store the reference information in the frame memory in step S2 using the reference setting switch S1. This embodiment makes it possible to search for frames with a single switch operation.

As shown in FIGS. 10 and 11 (A), when entering the frame search mode, the VTR 1 starts normal playback (step 100), and at the same time as the switch S1 is pressed, a reference signal is written (step 202, step 102). At the same time, the number of frame pulses starts from 1, and after counting A (for example, 1), 9 frames worth until the search switch S2 is pressed is written in the memory, the multi-screen is displayed, and then stopped ( Step 201a, Steps 105-108).

If there is a desired frame within the multi-screen, the desired frame is stored in the memory and outputted (step 109, steps 110-119), as in the first embodiment.

If the desired frame is not within the multi-screen, the number of modified blocks is input (step 120). here,
Depending on the timing of the reference point and the search switch,
As shown in FIG. 11(B), the desired frame position may be located before the reference point (step 203).
).

At this time, after rewinding to a position before the desired block correction position (frame position) and performing normal playback, a new reference signal is written at a certain position from the already written reference signal (step 204 ~206). The number of frame pulses is counted again from this new reference signal, multi-screen writing is performed at the block correction position (steps 207 to 209), and a frame search is performed in the same manner as in the first embodiment ( Step 107~).

In this way, by pressing the switch once, the reference signal is written and stored in the memory at the same time, and if there is a desired frame before the written reference signal, a new reference signal is written again. Frames can be searched without complicated operations.

[Third Embodiment] In the first embodiment described above, when the timing interval between the reference signal and the search switch becomes long, the search takes time and it becomes necessary to find a new reference point. So the 12th
As shown in the figure and FIG. 13, reference signals are sequentially written for each frame pulse number that is a multiple of the number of multi-screens (for example, m times) until the search switch is pressed (step 3).
00 to 302), the frame search may be performed using this reference point. Since the interval between the desired frame and the reference point does not become unnecessarily long, errors due to input accuracy are also small.

Further, when searching for a frame, the number of search rooms and the number of blocks may be displayed on the multi-screen, or the desired frame screen that has been selected may be made to blink.

In the above embodiment, the number of frame pulses from the frame detector 9 was used as the count value from the reference signal.
The number of control pulses from the detector 3a may also be used.

Further, the frame search devices such as the system controller 2 and the memory 5 may be built in the VTRI, built in a stamping device (printer) not shown, or configured as an adapter interposed between the two. If built into the printing device, the frame memory 5 can also be used as a buffer memory for eight printing positions.

(Effects of the Invention) As detailed above, according to the frame search device of the present invention, any frame of a reproduced video signal of a VTR is
Since R can be searched and extracted from the normal playback state and stored in the memory without changing to still playback, the video signal of the desired frame can be searched with high precision without fail.

Multiple consecutive frames are displayed on the monitor, so
It is easy to search for the desired frame.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the frame search device according to the present invention, and is a block diagram showing an example in which the frame search device is realized by a system controller (microcomputer) and added to a video cheap reloader. Figures 2 (A> and (B)), Figure 3 are diagrams explaining writing and reading to and from the memory by the control circuit, Figure 4 is a diagram showing the multi-screen, and Figure 5 is executed by the system controller. Figures 6 (A) and (B) are explanatory diagrams showing the operation of the video tape recorder by the frame search apparatus, and Figures 7 (A) and (B) are diagrams showing the operation of the frame search apparatus. ) is a diagram showing a modified example, FIGS. 8(A) and (B) are diagrams showing a modified example, and FIG. 9(
A) to (C) are diagrams explaining modified examples, FIGS. 10 and 11.
Figures (A) and (B) show the second embodiment, Figures 12 and 13 show the third embodiment, and Figures 14 to 1.
FIG. 7 is a diagram for explaining control pulses, FIG. 18 is a diagram for explaining a conventional example, and FIG. 19 is a diagram for explaining problems with the conventional method. DESCRIPTION OF SYMBOLS 1... Video tape recorder (VTR), 2... System controller, 5... (frame) memory, 11... Control circuit. Patent applicant: Japan Victor Co., Ltd. Representative: Kunio Kakiki (A) (B) Figure 1-→G End l Marv (, fJ v Figure #! Figure #! Figure #! Figure #! Figure #! Figure (I3) Figure (F5) (A) (a7.b, -t7-et al%h-n V7'JI#) (a
Dar"t" Hosun 杆 Kai Awakening 1 (B) (C) Fig. Diagram

Claims (1)

[Claims] A frame in which a desired frame is retrieved from a frame-by-frame video signal reproduced by a helical scan type magnetic recording and reproducing device in which control pulses are recorded in the longitudinal direction of a magnetic tape and stored in a frame memory. A search device comprising: means for rewriting a duty ratio of a control pulse on a magnetic tape to set a reference point; a control means for storing video signals of a plurality of consecutive frames in the frame memory; means for measuring the number of frames to be stored in the frame memory; means for generating the number of search frames from a desired frame selected from a plurality of frames stored in the frame memory; and the number of search frames from the reference point. A frame search device comprising means for storing a video signal of 1 in the frame memory.