JPH1155625A - Moving image reproduction device, moving image reproduction method, and recording medium recording moving image reproduction program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a moving image in a desired direction according to an instruction. SOLUTION: The moving image reproducing device includes a decoder 12 connecting to a medium reproducing device 11, an image output device 13 that outputs an image decoded by a decoder 12, and a controller 14 that connects to the decoder 12 and controls a reproduction direction of the image. The decoder 12 stores a forward reproduction file 22 that reproduces a moving image in a forward direction and a reverse reproduction file 22 that reproduces a moving image in a reverse direction in cross reference with a frame index 23 to specify each frame. After the controller 14 reproduces the forward reproduction file 21 from N1 to N6 (index number 6), when reverse reproduction is instructed, the reverse reproduction file 22 is reproduced in the sequence of R4 → R5 → R6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture reproducing apparatus, a moving picture reproducing method, and a recording medium on which a moving picture reproducing program is recorded, which reproduces moving pictures such as MPEG data compressed using key frames. The present invention relates to a moving image reproducing apparatus that interactively displays moving images, a moving image reproducing method, and a recording medium that stores a moving image reproducing program.

[0002]

2. Description of the Related Art As a method for efficiently processing a moving image with a small memory, an MPEG compression technique is well known. M
In the PEG compression technique, a key frame is arranged at predetermined intervals, and an interpolation frame generated from a previous frame in association with the key frame based on the key frame.

[0003]

A conventional moving image has been constructed as described above. Based on the key frames provided at predetermined intervals, an interpolation frame is prepared based on the previous image data, and the image between the key frames is interpolated by the interpolation frame, so that the image can be reproduced in the forward direction However, there is a problem that only the key frame can be reproduced in the reverse direction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. A moving image compressed using a key frame such as an MPEG moving image in a forward direction or a backward direction according to an instruction is provided. It is an object of the present invention to provide a moving image reproducing apparatus, a moving image reproducing method, and a recording medium on which a moving image reproducing program is recorded so that an image can be reproduced in a desired direction.

[0005]

According to a first aspect of the present invention, there is provided a moving image reproducing apparatus for preparing a moving image compressed using a key frame, and for instructing reproduction of a moving image in a forward direction or a reverse direction. And means for reproducing the moving image in the forward or reverse direction according to the instruction means.

[0006] Since the moving image can be reproduced in the forward or reverse direction according to the instruction means, a moving image reproducing apparatus capable of reproducing the moving image in a desired direction according to the instruction can be provided.

According to a second aspect of the present invention, there is provided a moving image reproducing method, wherein a step of preparing a moving image compressed using a key frame, a step of instructing reproduction of the moving image in a forward or reverse direction, And reproducing the moving image in the forward direction or the reverse direction.

[0008] Since a moving image can be reproduced in a forward or reverse direction in accordance with an instruction, a moving image reproducing method capable of reproducing a moving image in a desired direction in accordance with an instruction can be provided.

According to a third aspect of the present invention, a computer prepares a moving image compressed using a key frame, and instructs reproduction of the moving image in a forward direction or a reverse direction. Function as means for reproducing a moving image in a forward direction or a reverse direction according to the instruction means.

Since a moving image can be reproduced in a forward or reverse direction in accordance with an instruction, a computer-readable recording medium capable of reproducing a moving image in a desired direction in accordance with an instruction can be provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a main part of a moving picture reproducing apparatus according to one embodiment of the present invention. Referring to FIG. 1, a moving image reproducing device 1 is connected to a media reproducing device 11 that reproduces a medium having image data recorded by using a moving image compression technique,
A decoder 12 for decoding a moving image, and an image output device 13 connected to the decoder 12 for outputting decoded image data
And A controller 14 is connected to the decoder 12, and a switch (not shown) provided on the controller 14 instructs forward reproduction or reverse reproduction of a moving image.

The decoder 12 includes a CPU for performing processing for decoding an image signal compressed by a moving image compression technique, a memory for storing decoded image data, and the like.

(1) First Embodiment First, a first embodiment of the present invention will be described. In the first embodiment, as shown in FIG. 2, the decoder 12 has two playback modes: a forward playback file 21 that plays back moving image data stored in a medium in a forward direction, and a reverse playback file 22 that plays back this in a reverse direction. Have a file. Assuming that the frames constituting the forward reproduction file 21 are N1, N2 to N9 in order, the frames constituting the reverse reproduction file 22 are R1, R2
2 to R9. As shown in FIG. 2, the N1 frame corresponds to the R9 frame, the N2 frame corresponds to the R8 frame, and so on, the N9 frame corresponds to the R1 frame. These frames are mutually index 23
Is associated with. For example, as shown in FIG. 2, the index of the N1 frame (R9 frame) is represented by 1, and the position of the N2 frame (R8 frame) is represented by index 2. In the same manner, each of the files 21 and
The position of the frame that constitutes No. 2 is specified by the index number.

Next, two files 2 having the configuration shown in FIG.
The operation of the decoder 12 for reproducing a moving image will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the decoder 12 according to the first embodiment of the present invention. When the user operates the controller 14 to output a reproduction signal, the reproduction signal is received by the decoder 12 (step S10, hereinafter abbreviated as steps). First, it is determined whether the reproduction is forward or reverse (S1).
1). If it is forward reproduction (YES in S11),
The sequential reproduction file 21 is reproduced in the order of the index numbers shown in the index 23 (S12). Every time a frame is reproduced, the index number is counted up (S13), and the next signal is determined (NO in S14,
S11) Reproduction is continued. At that time, reverse playback file 2
2 calculates a frame image corresponding to the index number.

When reverse playback is instructed from the controller 14 (NO in S11), the reverse playback file 22 is played from the position corresponding to the index number of the index 23 (S15). As the frame is played in the reverse direction, the index number is counted down (S1).
6). The next signal is determined (NO in S17, S11),
This is continued until the moving image ends (S14, S1).
YES at 7).

As described above, in the first embodiment of the present invention, the forward reproduction file and the reverse reproduction file are prepared as files in the decoder 12 in advance, and the files are stored in association with each other by a predetermined index number. Therefore, by operating the controller 14, the user can reproduce a desired image in either the forward direction or the reverse direction.

(2) Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a schematic diagram showing the sequential playback file 31 stored in the decoder 12 in the second embodiment of the present invention, and FIG. 5 is a flowchart for explaining the operation in the second embodiment.

Referring to FIG. 4, forward reproduction file 31 is basically the same as forward reproduction file 21 shown in FIG. 2 of the first embodiment. For example, as shown in FIG. 4, the forward reproduction file 31 is a key frame K capable of intra-frame encoding which can be encoded only by intra-frame information every four frames.
1, K2, K3,... .DELTA.K1, .DELTA.K having only difference data from the key frame between these key frames.
1 ', .DELTA.K1 ". The interpolation frames .DELTA.K1, .DELTA.K1', .DELTA.K1" have only difference data from the preceding image data in time series. Therefore, only the subsequent frame can be reproduced in chronological order. In FIG. 4A, an index number 32 is assigned to the forward playback file 31 so as to correspond to each frame constituting the forward playback file 31. In the index numbers, the key frames are marked with a circle.

FIG. 4B shows a processing procedure when the controller 14 reproduces a moving image in the forward and reverse directions. FIG. 4B is a diagram showing the flow of processing in the case where the reproduction is started from the key frame K1 and the image is reproduced in the reverse direction when the reproduction is performed up to the key frame K2, and FIG. Interpolated frame ΔK2 ″ from key frame K1
This indicates a state in which reverse reproduction is instructed when the image has been reproduced up to and reproduction of the forward image has been performed again when the reverse reproduction has been performed up to ΔK1 ′.

First, referring to FIG. 4B, it is assumed that reproduction in the forward direction is started from the key frame K1 (B1 → B2) and reproduced up to the key frame K2 (B2). Up to this point, normal moving image reproduction is performed (S21 and S2 in FIG. 5).
2). Here, it is assumed that reverse reproduction of an image is instructed by the controller 14 (NO in S23, Y in S24, S25
ES).

Then, the index pointer is returned from the stop position 5 (B3) to the previous key frame position 1 (B4) (S26). Then, three images corresponding to the index numbers 2, 3, and 4 are prepared based on the key frame K1 (B5 → B6), which are sequentially stored in a memory (not shown), and the pointer is instructed to perform reverse reproduction. (S27, S28). From this state, images are read from the memory in the order of index numbers 4, 3, 2, and 1 (B
7 → B8), the image data is output to the image output device 13 (S29). At this time, the index number is also counted down (S30).

In the above embodiment, the key frame K2
Has been described in the case where the image is reversely reproduced from the position 5 described above.
Even when the reverse reproduction of the image is instructed at 2 ″ (index number 8), the processing is performed in the order of C1 → C2 →
As shown by C3 → C4 → C5 → C6 → C7 → C8, FIG.
This is the same as the case shown in FIG.

Next, the operation when the forward reproduction is instructed after the reverse reproduction will be described with reference to C8 → C9 → C10 →
This will be described with reference to C11 → C12.

Assuming that an instruction from the reverse reproduction to the forward reproduction is issued at the position of frame ΔK1 ′, the processing proceeds from C8 → C9 →
The processing is performed in the order of C10 → C11. That is, first, the pointer is returned to the key frame K1 before the frame ΔK1 '(S34). Then, in order to create an image of ΔK1 ″, images of index numbers 2, 3, and 4 are created based on the key frame K1, and the images are stored in the memory (S35).
(S36), from which image reproduction in the forward direction is started (C11 → C12).

As described above, in the moving image reproducing apparatus according to the second embodiment, image reproduction in a desired direction is performed only by the sequential reproduction file 31 and the memory for storing the reproduced image.

Since the reproduction content of a moving image can be interactively controlled, this processing can be used for interactive walk-through software or the like. Also, MP
If EG technology or the like is used, high-quality full-screen and full-frame reproduction can be performed. In addition, the present technology can be applied to 3D images as well as 2D images.

Although the above embodiment has been described with respect to an example using a decoder, it goes without saying that the program may be recorded on a recording medium as a program for causing a normal computer to perform the above operations.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of a moving image reproducing apparatus according to the present invention.

FIG. 2 is a schematic diagram illustrating an operation of the image reproducing device according to the first embodiment.

FIG. 3 is a flowchart illustrating an operation of the moving image reproducing device according to the first embodiment.

FIG. 4 is a schematic diagram for explaining an operation of the moving image reproducing device according to the second embodiment.

FIG. 5 is a flowchart showing an operation of the moving image reproducing device according to the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 moving image playback device 11 media playback device 12 decoder 13 image output device 14 controller 21 forward playback file 22 reverse playback file 23 index 31 forward playback file

Claims (3)

[Claims] A means for preparing a moving image compressed using a key frame; a means for instructing reproduction of the moving image in a forward direction or a reverse direction; and a method for moving the moving image in a forward direction in response to the instruction means. Or a means for reproducing in the reverse direction. 2. A step of preparing a moving image compressed by using a key frame; a step of instructing reproduction of the moving image in a forward direction or a reverse direction; Or a method of reproducing in the reverse direction. 3. A means for preparing a moving image compressed by using a key frame to a computer, a means for instructing reproduction of a moving image in a forward direction or a backward direction, A recording medium storing a computer-readable moving image reproduction program in which a program for executing means for executing reproduction in a forward or reverse direction is recorded.