JPH09224221A - Slow reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate series of slow regenerative images by writing N (N is an integer >= 2) pieces of slave pictures provided by high-speed photographing in a frame memory and controlling the read of data. SOLUTION: On a magnetic tape 1, a source image composed of N pieces of slave pictures photographed by a high-speed photographing device is recorded in the period of one field. A VTR reproducing circuit 2 reproduces the source image at 1/L (an integer L>=N) speed as high as ordinary speed. A frame memory 3 can store video data for one frame and while keeping the arrangement of slave pictures, video data are written. A memory control circuit 4 controls reading from the frame memory 3 so that the video data consisting of respective slave pictures are slowly reproduced by being outputted as series of video data by arranging them in the order of time at the time of photographing within the L-fold period of a field cycle. Besides, the video data are arranged in the reverse order of time so as to be reversely slowly reproduced as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slow playback device for producing a slow playback image from an original image obtained by high-speed shooting.

[0002]

2. Description of the Related Art Heretofore, a high-speed image pickup apparatus has been proposed which is capable of high-speed image pickup of N times (N is an integer of 2 or more) as usual for the purpose of generating a slow-motion image (Japanese Patent Laid-Open No. 7-212657 [Patent Document 1] H
04N5 / 335]). If the high-speed photographing device is connected to a digital VTR, the magnetic tape has a field period (1/60 second).
An original image obtained by synthesizing N images taken at a cycle of 1 / N of 1 into one screen is recorded at a field cycle.

For example, when a high-speed shooting of 4 times is performed, as shown in FIG. 2A, a period (1) of a field period (1
/ 240 seconds), four images are taken, and these four images are arranged in a sub-screen obtained by dividing one screen into four, as shown in Fig. 2B, and are recorded on the magnetic tape as one original image. Will be recorded. Therefore, if the VTR having the normal slow reproduction function is used to perform slow reproduction of the magnetic tape at a speed of 1/4 of the normal speed, the video data of the original image for one field shown in FIG. 2B is stored in the memory. After that, the video data of the original image is repeatedly read four times in the field cycle from the memory and output. Then, the video data of the original image is updated at a cycle four times as long as the field cycle (1/15 seconds).

Therefore, if the video data of the original image shown in FIG. 2 (b) is subjected to appropriate processing, as shown in FIG. 2 (d), four sub-screens are arranged smoothly on a single time axis. It is possible to obtain a slow reproduction image.

[0005]

However, FIG.
The specific data processing for generating the slow reproduction image shown in FIG. 2D from the original image shown in FIG. 2B has not been clarified yet. An object of the present invention is to clarify the configuration of a slow playback device for generating a slow playback image from an original image obtained by high-speed shooting.

[0006]

SUMMARY OF THE INVENTION A slow reproduction apparatus according to the present invention comprises an image reproduction means for reproducing an original image from a recording medium at a speed of 1 / L (L is an integer of N or more) which is normal, and at least one screen. Memory device capable of storing a minute amount of video data, a data writing control device for writing video data of at least one screen of original image obtained from the image reproducing device into the memory device, and a video data of the original image from the memory device. And the video data of each child screen are arranged in a sequence along the time axis within a cycle of L times the normal screen cycle and output as a series of video data.

In the slow playback device, N images (FIG. 2 (a)) are recorded on the recording medium by N times high-speed shooting.
An original image (FIG. 2 (b)) synthesized on the screen is recorded at a field cycle, and by reproducing the recording medium at a speed of 1 / L of a normal speed, a cycle of L times the field cycle is obtained. The original image will be obtained. After temporarily storing the video data of the original image in the memory means (FIG. 2 (c)), the video data of each sub-screen is read out from the memory means in a predetermined time order (forward order or reverse order) for each child screen. , Are output in the field cycle (FIG. 2 (d)). As a result, the video data of the respective sub-screens are arranged on a single time axis, and a series of slow reproduction images can be obtained.

A slow reproduction apparatus for performing slow reproduction in the forward direction of the time axis, which is the slow reproduction for processing the image data of the original image in the field unit, runs the magnetic tape in the forward direction and From the image reproducing means for reproducing the original image at a normal speed of 1 / L (L is an integer of N or more), a memory means capable of storing at least one field of video data, and an image reproducing means. The data writing control means for writing the video data of the original image for one field into the memory means, and the video data of the original image is read from the memory means, and the video data forming each sub-screen is within the cycle of L times the field cycle. And a data read control means for outputting the data as a series of video data arranged in time order at the time of shooting.

In the slow playback device, after the video signal of the original image of the first field of the two fields making up one frame is written in the memory means, the N sub-screens of the original image making up the original image are displayed. The video data is read out in time sequence at the time of shooting. Next, the video signal of the original image of the second field of the two fields is written in the memory means,
After that, the video data of the N sub-screens forming the original image are read out in time sequence at the time of shooting.

On the other hand, a slow-motion reproducing apparatus for performing slow-motion reproduction in the opposite direction of the time axis, which is field-slow reproduction for processing video data of an original image on a field-by-field basis,
An image reproducing means for reproducing the original image from the magnetic tape at a speed of 1 / L (L is an integer equal to or more than N) and a video data for at least one field by running the magnetic tape in the reverse direction. And a data writing control means for writing the video data of the original image for one field obtained from the image reproducing means into the memory means, the video data of the original image being read from the memory means, and each sub-screen being configured. The data read control means for arranging the video data to be arranged in the time period L times as long as the field cycle in a time order opposite to that at the time of shooting and outputting it as a series of video data.

In the slow playback device, of the two fields constituting one frame, first, the video signal of the original image of the second field is written in the memory means, and then the N sub-pictures constituting the original image are formed. The video data of is read out in the order of time opposite to that at the time of shooting. Next, the video signal of the original image of the first field of the two fields is written in the memory means, and thereafter, the video data of the N sub-screens constituting the original image is in reverse time order to that at the time of shooting. Read out.

Further, a slow-speed reproducing apparatus for performing slow-motion reproduction in the forward direction of the time axis, which is a slow-motion reproduction of the frame in which the video data of the original image is processed on a frame-by-frame basis, runs the magnetic tape in the forward direction. Image reproducing means for reproducing an original image from a magnetic tape at a normal speed of 1 / L (L is an integer of N or more), memory means capable of storing at least one frame of video data, and image reproducing means. The data writing control means for writing the video data of the original image for one frame obtained from the memory means and the video data of the original image from the memory means, and the video data for each field constituting each sub-screen of the field cycle. Data read control means for arranging in a time sequence at the time of shooting within a cycle of L times and outputting as a series of video data is provided.

In the slow playback device, after the video signals of the original images of the two fields making up one frame are written in the memory means, the video data of the N child screens making up the original image of the first field are written. The video signals of N child images forming the original image of the second field are read out in time order at the time of shooting, and then read out in time order at the time of shooting.

On the other hand, a slow-motion reproducing apparatus for performing slow-motion reproduction in the reverse direction of the time axis, which is a slow-motion reproduction of the frame in which the video data of the original image is processed on a frame-by-frame basis, runs the magnetic tape in the reverse direction. Image reproducing means for reproducing an original image from a magnetic tape at a normal speed of 1 / L (L is an integer of N or more), memory means capable of storing at least one frame of video data, and image reproducing means. The data writing control means for writing the video data of the original image for one frame obtained from the memory means and the video data of the original image from the memory means, and the video data for each field constituting each sub-screen of the field cycle. The data read control means is arranged in a cycle of L times in the reverse time order to that at the time of shooting and outputs as a series of video data.

In the slow playback device, after the video signals of the original images of the two fields making up one frame are written in the memory means, the video data of the N child screens making up the original image of the second field are written. The video signals of N child images forming the original image of the first field are read out in the order of time opposite to that at the time of shooting.

[0016]

According to the slow playback device of the present invention,
It is possible to generate a slow reproduction image at an arbitrary reproduction speed in the forward direction or the reverse direction along the time axis based on the original image obtained by high-speed shooting.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The slow playback device of the present embodiment is a high-speed image capturing device (special feature: N is a multiple of N) (N is an integer of 2 or more), as shown in FIGS. 2 (a) and 2 (b). Kaihei 7-212657),
Video data for one field L times in field cycle
(L is an integer equal to or greater than N) It is configured as shown in FIG. 1 on the premise of a conventional VTR reproducing circuit having a slow reproducing function of repeatedly outputting.

Video data of an original image (FIG. 2 (b)) composed of a plurality of sub-pictures photographed by a high-speed photographing device is recorded on the magnetic tape (1), and the picture data is reproduced in the slow reproduction mode. After being reproduced by the VTR reproducing circuit (2) having a function, it is written in the frame memory (3) while maintaining the arrangement of the sub-picture (Fig. 2 (c)), and then the frame memory.
By controlling the data reading from (3), video data of a series of slow playback images (FIG. 2D) is generated. The slow playback device of the present invention can perform two types of data processing: field slow playback for processing video data of an original image in field units and frame slow playback for processing video data of original images in frame units. .
In addition, two kinds of slow reproduction operations are possible: forward slow reproduction for performing slow reproduction in time order at the time of shooting, and reverse slow reproduction for performing slow reproduction in time order opposite to that at the time of shooting.

Here, the principle of the slow playback device of the present invention will be described by taking as an example the operation when the slow playback is performed at a speed of 1/4 of the normal speed and when the slow playback is performed at a speed of 1/6 of the normal speed. Will be specifically described.

1/4 Forward Field Slow Playback As shown in FIG. 3 (a), a high-speed image capturing apparatus is used to perform a 1/4 cycle (1/240 second) of a field cycle (1/60 second).
Images A, B, C, D, A ', B', C ', which are sub-screens
D '... is photographed, and these images are displayed as shown in Fig. 3 (b).
Video data of original images f1, f2, ... Combining four images in the field period into one screen is recorded on the magnetic tape at a field cycle.

When performing the field slow reproduction in the forward direction at the normal speed of 1/4, the original image is reproduced at the normal speed of 1/4 by intermittently running the magnetic tape in the forward direction. At this time, from the VTR reproduction circuit (2),
As shown in FIG. 3C, the video data of one original image f1 is repeatedly output four times in the field cycle, and thereafter, similarly,
The video data of the subsequent original image f2 is repeatedly output four times in the field cycle. In this process, first
After the video data of one original image f1 is written in a predetermined address of the frame memory (3), the frame memory (3)
By controlling the reading of data from the
As shown in (d), the video data forming each sub-screen is read in the field cycle in time order (A, B, C, D) at the time of shooting. Then, in the last data read cycle, after the video data of the subsequent original image f2 is written at a predetermined address of the frame memory (3), the reading of the data from the frame memory (3) is controlled to The video data that makes up the inset screen is in time order (A ', B',
C ', D') are read in the field cycle. As a result, a slow reproduction image in the forward direction at a speed of 1/4 of the normal speed can be obtained.

1/4 Forward Frame Slow Reproduction When performing frame slow reproduction in the normal direction at a speed of 1/4 of the normal speed, by intermittently running the magnetic tape in the forward direction, a speed of 1/4 of the normal speed is achieved. To play the original image.
At this time, as shown in FIG. 3 (e), the VTR reproducing circuit (2) continuously outputs the video data of the two original images f1 and f2 within one frame period. Repeated 4 times. In this process, first, the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), and then the video data of the original image f2 of the second field is written in a predetermined address of the frame memory (3). Written in. Then, by controlling the reading of data from the frame memory (3), as shown in FIG.
The video data that makes up each sub-screen is ordered by the time of shooting
(A, B, C, D, A ', B', C '...) are read in the field cycle. As a result, a slow reproduction image in the forward direction at a speed of 1/4 of the normal speed is obtained.

1/4 Reverse Field Slow Reproduction When performing reverse field slow reproduction at a speed of 1/4 of the normal speed, the magnetic tape is intermittently run in the reverse direction so that the speed is a 1/4 speed of the normal speed. To play the original image. At this time, the video data of the original image f2 of the second field is repeatedly output from the VTR reproducing circuit (2) four times in the field cycle as shown in FIG. 4 (a), and then the original image f1 of the first field is output. Video data of 4 in the field cycle
It will be output repeatedly. In this process, first, the video data of the original image f2 of the second field is written in a predetermined address of the frame memory (3), and then the reading of the data from the frame memory (3) is controlled, whereby the image data shown in FIG. As shown in (b), the video data forming each sub-screen is read in the field cycle in the reverse time order (D ', C', B ', A') from the time of shooting. Then, in the last data read cycle, after the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), the reading of data from the frame memory (3) is controlled. The video data forming each sub-screen is read in the field cycle in the reverse time order (D, C, B, A) from the time of shooting. As a result, a reverse slow-moving image at a speed of 1/4 of the normal speed can be obtained.

¼ Reverse Frame Slow Reproduction When reverse frame slow reproduction is performed at a normal speed of 1/4, the magnetic tape is intermittently moved in the reverse direction so that a normal speed of 1/4 is obtained. To play the original image.
At this time, as shown in FIG. 4C, the VTR reproducing circuit (2) continuously outputs the video data of the two original images f1 and f2 within one frame period, and this operation is performed at the frame cycle. Repeated 4 times. In this process, first, the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), and then the video data of the original image f2 of the second field is written in a predetermined address of the frame memory (3). Written in. Then, by controlling the reading of data from the frame memory (3), as shown in FIG.
As described above, the video data constituting each sub-screen is read in the field cycle in the reverse time order (D ', C', B ', A', D, C ...) At the time of shooting. As a result, a reverse slow-moving image at a speed of 1/4 of the normal speed can be obtained.

1/6 Forward Field Slow Playback As shown in FIG. 5 (a), a high-speed image capturing apparatus is used to perform a 1/4 cycle (1/240 second) of a field cycle (1/60 second).
Images A, B, C, D, A ', B', C ', which are sub-screens
D '... is photographed, and these images are displayed as shown in Fig. 5 (b).
Video data of original images f1, f2, ... Combining four images in the field period into one screen is recorded on the magnetic tape at a field cycle.

When performing field slow reproduction in the forward direction at a speed of 1/6 of the normal speed, the original image is reproduced at a speed of 1/6 of the normal speed by intermittently running the magnetic tape in the forward direction. At this time, from the VTR reproduction circuit (2),
As shown in FIG. 5C, the video data of one original image f1 is repeatedly output 6 times in the field cycle, and thereafter, similarly,
The video data of the subsequent original image f2 is repeatedly output 6 times in the field cycle. In this process, first
After the video data of one original image f1 is written in a predetermined address of the frame memory (3), the frame memory (3)
By controlling the reading of data from the
As shown in (e), the video data forming each sub-screen is in the time order at the time of shooting and for two arbitrary sub-screens A and C, the order (A, A, B) is repeated twice. , C, C,
According to D), it is read in the field cycle. And
In the last data read cycle, after the video data of the subsequent original image f2 is written to a predetermined address of the frame memory (3), the reading of the data from the frame memory (3) is controlled to control each child screen. The video data forming the same is in the time order at the time of shooting, and the order including two repetitions for any two child screens.
(A ', A', B ', C', C ', D') are read in the field period. By this, 1/6 of normal
A slow reproduction image in the forward direction at the speed of is obtained.

1/6 Forward Frame Slow Reproduction When performing frame slow reproduction in the forward direction at a speed of 1/6 of the normal speed, the magnetic tape is intermittently run in the forward direction so that the speed is 1/6 of the normal speed. To play the original image.
At this time, as shown in FIG. 5D, the VTR reproducing circuit (2) continuously outputs the video data of the two original images f1 and f2 within one frame period. Repeated 4 times. In this process, first, the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), and then the video data of the original image f2 of the second field is written in a predetermined address of the frame memory (3). Written in. Then, by controlling the reading of data from the frame memory (3), as shown in FIG.
As described above, the video data forming each sub-screen is 2 in the time sequence at the time of shooting and for any two sub-screens A and C.
Sequence with repetitions (A, A, B, C, C, D,
A ', A', B ', C', C '...) are read in the field cycle. As a result, a slow reproduction image in the forward direction at a speed of 1/6 of the normal speed can be obtained.

⅙ Reverse Field Slow Reproduction When performing reverse field slow reproduction at a speed of 1/6 of the normal speed, the magnetic tape is intermittently run in the reverse direction so that the speed is 1/6 of the normal speed. To play the original image. At this time, the video data of the original image f2 of the second field is repeatedly output from the VTR reproducing circuit (2) four times in the field cycle as shown in FIG. 6A, and then the original image f1 of the first field is output. Video data of 4 in the field cycle
It will be output repeatedly. In this process, first, the video data of the original image f2 of the second field is written to a predetermined address of the frame memory (3), and then the reading of the data from the frame memory (3) is controlled, so that FIG. As shown in (b), the video data forming each sub-screen has a time order opposite to that at the time of shooting, and an order in which two arbitrary sub-screens D ′ and B ′ are repeated twice ( D ', D', C ', B', B ', A') are read in the field period. Then, in the last data read cycle, after the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), the reading of data from the frame memory (3) is controlled. Similarly, the video data forming each sub-screen has a time order opposite to that at the time of shooting, and an order (D,
(D, C, B, B, A) are read in the field cycle. As a result, a reverse slow-motion reproduction image at a speed of 1/6 of the normal speed can be obtained.

1/6 Reverse Frame Slow Playback When reverse frame slow play is performed at a speed of 1/6 of the normal speed, the magnetic tape is intermittently run in the reverse direction so that the speed is 1/6 of the normal speed. To play the original image.
At this time, as shown in FIG. 6C, the VTR reproducing circuit (2) continuously outputs the video data of the two original images f1 and f2 within one frame period, and this operation is performed at the frame cycle. Repeated 4 times. In this process, first, the video data of the original image f1 of the first field is written in a predetermined address of the frame memory (3), and then the video data of the original image f2 of the second field is written in a predetermined address of the frame memory (3). Written in. Then, by controlling the reading of data from the frame memory (3), the data shown in FIG.
As described above, the video data forming each sub-screen has a time order opposite to that at the time of shooting, and is 2 for any two sub-screens.
Sequence with repetitions (D ', D', C ', B',
B ', A' ...) are read in the field cycle. As a result, a reverse slow-motion reproduction image at a speed of 1/6 of the normal speed can be obtained.

Circuit Configuration and Circuit Operation The operation in each of the above modes is realized by the circuit shown in FIG. The signal detected from the magnetic tape (1) is supplied to the VTR reproduction circuit (2), and the original reproduction image data output from the VTR reproduction circuit (2) is supplied to one input terminal a of the switch (6). It is also supplied to the other input terminal b of the switch (6) via the frame memory (3). or,
A frame update signal, an output field discriminating signal, and a vertical synchronizing signal, which will be described later, output from the VTR reproducing circuit (2) are supplied to the memory control circuit (4), and the memory control circuit (4) accordingly responds to the frame The writing and reading of the original reproduced image data to and from the memory (3) are controlled.

Further, a system control circuit (5) for integrally controlling the operation of the entire circuit is provided, and the system control circuit (5)
The operation mode signal is supplied from the VTR reproducing circuit (2) and the memory control circuit (4) to the magnetic tape (1).
A traveling speed command signal for controlling the traveling of the tape is supplied to the tape traveling system, and a switching signal for switching the switch (6) is supplied to the control terminal of the switch (6).

The switch (6) is set to the side a in the normal reproduction mode, and the original reproduction image data obtained from the VTR reproduction circuit (2) is directly output to the image display device. On the other hand, when the slow playback mode is selected, the switch (6) is switched from the a side to the b side, and the slow playback image data read from the frame memory (3) is output to the image display device. The circuit operation in the slow reproduction mode for N = 4 and L = 6 will be described below with reference to FIGS. 7 to 12.

In the case of ⅙ forward field slow reproduction, the VTR reproduction circuit (2) outputs signals shown in FIGS. 9 (a) (b) (c), respectively.
The original reproduced image data, the vertical synchronization signal, the frame update signal, and the output field discrimination signal shown in (d) are output.
In the case of ⅙ forward frame slow reproduction, the VTR reproduction circuit (2) outputs the original reproduction image data, vertical synchronization signal, and frame update shown in FIGS. 10 (a) (b) (c) (d), respectively. signal,
And an output field discrimination signal is output. Also, 1/6
VTR playback circuit for reverse field slow playback
From (2), the original reproduction image data, the vertical synchronization signal, the frame update signal, and the output field discrimination signal shown in FIGS. 11 (a) (b) (c) (d) are output. Furthermore, in the case of ⅙ reverse frame slow playback, the VTR playback circuit (2) outputs the original playback image data, vertical synchronization signal, and frame update shown in FIGS. 12 (a) (b) (c) (d), respectively. The signal and the output field discrimination signal are output.

In any case, the vertical synchronizing signal is output in the field cycle. The frame update signal is output when the frame of the original reproduction image data is updated. As the output field discrimination signal, "1" is output when the original reproduced image data is the first field (f1), and "0" is output when the original reproduced image data is the second field (f2).

For example, in the case of 1/6 forward field slow reproduction shown in FIG. 9, when a mode command is issued by the system control circuit (5), the magnetic tape (1) becomes 1 / normal.
The VTR reproduction circuit (2) repeatedly outputs the original reproduction image data f1 of the first field 6 times at the field cycle. Also, a frame update signal is output in this first field cycle,
This field indicates that data f1 of a new frame is output. The first six field periods are the first
Since the field data f1 is output, the output field determination signal maintains "1" for 6 field periods, and then changes to "0" during the field period in which the second field data f2 is output. During the subsequent 6-field period, the data f2 of the second field is output and the output field discrimination signal maintains "0".

At this time, the memory control circuit (4) executes the procedure shown in FIGS. 7 and 8. First, step S in FIG.
When the vertical synchronizing signal is input, the operation mode is determined in step S2. In the example of FIG. 9, since 1/6 forward field slow playback is selected, the process proceeds to step S4, and the value of the first internal memory M is input to the value of the second internal memory M1. Next, in step S5, the value of the first internal memory M is input to the value of the third internal memory M '. These procedures are for delaying the value of M updated in step S7 or S8 by 2 field periods to M1 only in the case of backward frame slow reproduction, and otherwise delaying it by 1 field period to M1 ( 9 (i) (j)).

Next, in step S6, it is determined whether or not the frame update signal is output. If it is output, the initialization processing of steps S7 and S9 is performed, and if the frame update signal is not output, the step is performed. First at S8
The value of the internal memory M is counted up. Therefore, the first
The value of the internal memory M is "0" when the frame is updated.
Therefore, after that, it increases by one every one field period. In step S9, the frame is updated to V
Since the new frame data is not output from the TR reproducing circuit (2) and the data is not yet written in the frame memory (3), the first field and the second field are stored in the frame memory (3). Both the f1 written flag and the f2 written flag, which should hold the state of whether they have been written, are reset to "0".

In the next steps S10 to S13, the first
It is determined whether or not the field data f1 should be written, and when it should be written, the f1 write signal is generated, and f
1 Set the written flag to "1". In the present embodiment, if the f1 written flag indicates unwritten and the output field determination signal indicates f1, f1
Generate a write signal. However, in the case of the backward frame slow playback (FIG. 12), since the slow playback image based on the data f1 of the first field of the previous frame is displayed in the first and second field periods, it is assumed that the frame is immediately updated. When the data f1 of the second field is written in
Since the data f1 of the previous frame is erased, 2
When <M, the f1 write signal is not generated.

Next, in steps S14 to S16, the second
It is determined whether or not the field data f2 should be written, and when it should be written, an f2 write signal is generated, and f
2 Set the written flag to "1". In this embodiment, when the f2 written flag indicates unwritten and the output field determination signal indicates f2, f2
Generate a write signal.

After step S17 shown in FIG. 8, it is determined which sub-picture image of the original image written in the frame memory (3) should be read. First, step S1
At 7, it is determined whether the value of the second internal memory M1 is "0", and if it is "0", the fourth internal memory C is reset to "0" at step S18. If it is not "0", N / L is added to the value of C in step S19. In this embodiment, N = 4 and L = 6, and the value of C increases by 2/3 every one field period (FIG. 9 (l)).

In the next steps S20 to S28, the sub-picture to be read is determined based on the internal memories M1 and C depending on whether it is the slow reproduction in the forward direction or the slow reproduction in the reverse direction. In the case of forward slow playback, the value of the internal memory C is set to the number N of child screens (= 4) in step S21.
Let C1 be the integer part of the remainder divided by, and determine the value of M1 in step S22. If M1 is smaller than L, read data f1 of the first field from the frame memory (3) in step S23, and Is greater than or equal to L, the f1 / f2 read signal (FIG. 9) is used to read the second field data f2 from the frame memory (3) in step S24.
(k)) is created. On the other hand, in the case of the slow reproduction in the reverse direction, in step S25 of FIG. 8, the value obtained by subtracting the integer part of C / 4 from 3 is set as C1, and the value of M1 is determined in step S26, and M1 is L. If smaller than step S
In step 27, the second field data f2 is read from the frame memory (3), and if M1 is L or more, step S28.
The data f1 of the first field from the frame memory (3)
In order to read, the f1 / f2 read signal (FIG. 9 (k)) is created.

In step S29, which sub-picture is to be read is determined based on the f1 / f2 read signal thus created and the value of the internal memory C1, and a read address for the frame memory (3) is generated. . That is, C1
If "0" is the upper left, "1" is the upper right, 2 "is the lower left, and if it is" 3 ", the lower right is read.
It controls the memory. As a result, a slow reproduction image is obtained as shown in FIG.

1/6 forward frame slow playback, 1/6
Also in the case of the backward field slow playback and the 1/6 backward frame slow playback, the same procedure is performed as shown in FIG.
0, a slow reproduction image is obtained as shown in FIGS.

As described above, according to the slow-motion reproducing apparatus of the present invention, the slow-motion image is reproduced at an arbitrary reproduction speed in the forward or reverse direction along the time axis based on the original image obtained by high-speed shooting. It is possible to generate.

The description of the above embodiments is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a slow playback device according to the present invention.

FIG. 2 is a diagram illustrating the basic principle of a slow playback device according to the present invention.

FIG. 3 is a diagram for explaining an operation of forward slow reproduction at a speed of ¼.

[Fig. 4] Fig. 4 is a diagram illustrating an operation of reverse slow-motion reproduction at a speed of ¼.

[Fig. 5] Fig. 5 is a diagram illustrating an operation of forward slow reproduction at a speed of 1/6.

[Fig. 6] Fig. 6 is a diagram illustrating an operation of reverse slow-motion reproduction at a speed of 1/6.

FIG. 7 is a flowchart showing the first half of the operation of the slow playback device shown in FIG.

FIG. 8 is a flowchart showing the latter half of the same operation.

FIG. 9 is a time chart showing the operation of the device in the 1/6 forward field slow playback mode.

FIG. 10 is a time chart showing the operation of the device in the 1/6 forward frame slow playback mode.

FIG. 11 is a time chart showing the device operation in the 1/6 reverse field slow playback mode.

FIG. 12 is a time chart showing the device operation in the 1/6 backward frame slow playback mode.

[Explanation of symbols]

 (1) Magnetic tape (2) VTR playback circuit (3) Frame memory (4) Memory control circuit (5) System control circuit (6) Switch

Front page continued (72) Inventor Kenichi Kido 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masahiko Tomikawa 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd.

Claims (8)

[Claims] 1. An original image in which one screen is composed of N child screens, and N images taken at a cycle of 1 / N of a normal screen cycle (N is an integer of 2 or more) are displayed. Each of the original images arranged in a predetermined sub-screen is recorded on a recording medium in which a normal screen period is recorded, the original image is reproduced from the recording medium, and a slow reproduction image is reproduced based on the original image. In the slow playback device to generate, the original image from the recording medium is 1 / L of normal (L is an integer of N or more)
Image reproducing means for reproducing at a speed of 1, memory means capable of storing at least one screen of video data, and data for writing at least one screen of original image video data obtained from the image reproducing means into the memory means. While reading the video data of the original image from the writing control means and the memory means,
Slow, characterized by comprising data read control means for arranging the video data of each sub-screen in a sequence along the time axis within a cycle of L times the normal screen cycle and outputting as a series of video data. Playback device. 2. A predetermined number of images each of which is an original image composed of N sub-screens and which is photographed at a cycle of 1 / N (N is an integer of 2 or more) of a field cycle. Slow playback in which the original image arranged in the child screen is reproduced on the magnetic tape recorded in the field cycle, and the slow reproduction image is generated based on the original image. In the apparatus, the magnetic tape is run in the forward direction to reproduce the original image from the magnetic tape at a normal speed of 1 / L (L is an integer of N or more), and at least one field of video data. When the memory means capable of storing the data, the data writing control means for writing the video data of the original image for one field obtained from the image reproducing means into the memory means, and the video data of the original image read from the memory means To,
Slow playback characterized by comprising data read control means for arranging the video data forming each sub-screen in a time sequence at the time of shooting within a cycle of L times the field cycle and outputting as a series of video data. apparatus. 3. An original image, in which one screen is composed of N child screens, and N images taken in a cycle of 1 / N (N is an integer of 2 or more) of a field cycle are predetermined. Slow playback in which the original image arranged in the child screen is reproduced on the magnetic tape recorded in the field cycle, and the slow reproduction image is generated based on the original image. In the apparatus, the magnetic tape is run in the reverse direction, and the image reproducing means for reproducing the original image from the magnetic tape at a speed of 1 / L (L is an integer of N or more) that is normal, and at least one field of video data. When the memory means capable of storing the data, the data writing control means for writing the video data of the original image for one field obtained from the image reproducing means into the memory means, and the video data of the original image read from the memory means To,
It is characterized by further comprising data read control means for arranging the video data forming each sub-screen in a time period L times as long as the field cycle in a time order opposite to that at the time of shooting and outputting as a series of video data. Slow playback device. 4. The image reproducing means comprises a memory capable of storing the video data of one field, and stores the video data of the original image of one field reproduced from the magnetic tape and the memory. 4. The slow playback device according to claim 2, wherein the video data for one field is repeatedly output L times in a field cycle. 5. An original image, in which one screen is composed of N child screens, and each of N images taken in a cycle of 1 / N (N is an integer of 2 or more) of a field cycle is predetermined. Slow playback in which the original image arranged in the child screen is reproduced on the magnetic tape recorded in the field cycle, and the slow reproduction image is generated based on the original image. In the apparatus, the magnetic tape is run in the forward direction to reproduce the original image from the magnetic tape at a normal speed of 1 / L (L is an integer of N or more), and at least one frame of video data. A memory means capable of storing the data, a data writing control means for writing the video data of the original image for one frame obtained from the image reproducing means into the memory means, and reading the video data of the original image from the memory means.
The video data for each field that configures each sub-screen is arranged in the order of time at the time of shooting within a cycle that is L times the field cycle,
A slow playback device, comprising: a data read control means for outputting a series of video data. 6. A screen is an original image composed of N child screens, and each of N images taken in a cycle of 1 / N (N is an integer of 2 or more) of a field cycle is predetermined. Slow playback in which the original image arranged in the child screen is reproduced on the magnetic tape recorded in the field cycle, and the slow reproduction image is generated based on the original image. In the apparatus, the magnetic tape is run in the opposite direction to reproduce the original image from the magnetic tape at a normal speed of 1 / L (L is an integer of N or more), and at least one frame of video data. A memory means capable of storing the data, a data writing control means for writing the video data of the original image for one frame obtained from the image reproducing means into the memory means, and reading the video data of the original image from the memory means.
And a data read control means for arranging the video data for each field constituting each sub-screen in a period L times as long as the field period in the reverse time order to that at the time of shooting and outputting as a series of video data. Slow playback device. 7. The image reproducing means comprises a memory capable of storing one frame of video data, stores the one frame of video data of one frame reproduced from the magnetic tape, and stores the memory. 7. The slow playback device according to claim 5, wherein the video data for one frame is repeatedly output L times in a frame cycle. 8. The data read control means outputs the video data of (L−N) child screens out of N child screens twice in succession within a period L times the field period. The slow playback device according to any one of claims 2 to 7.