JP3108162B2 - Still image file playback system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image file reproducing system for reading recorded data from a recording medium in which still image data is recorded in a compressed or uncompressed state and restoring the data as still image data.

[0002]

2. Description of the Related Art In recent years, standardization of high-definition still image discs has been promoted. The basic configuration of such a system is shown in FIG. In FIG. 1, an image drive device 1, an audio drive device 2, and a control drive device 3 read respective disks on which still image data, audio data, and control data are recorded, and read the read disks into a playback device 4. Supply signal.

[0003] Still image data read by the image drive device 1 is supplied to an input terminal of a switching circuit 5. The switching circuit 5 selectively switches the output destination of the data supplied to the input terminal to one of the compression decoder 6 and the switching circuit 7. The compression decoder 6 uses JPEG
(Joint PhotographicExperts Group: International standard for compressing the amount of information of a still image) It has a decoding function of baseline compression. The output of the compression decoder 6 is connected to a switching circuit 7. If the read still image data is compressed data, it is supplied to the compression decoder 6. If the read still image data is non-compressed data, it is directly supplied to the switching circuit 7. The switching circuit 7 selectively switches the output destination of the supplied data to any one of the image memories 8a, 8b and 8c.

[0004] The image memory has a three-frame configuration to provide a predetermined screen effect, and 8a, 8b and 8c are each treated as a frame memory in units of one frame. These frame memories 8a, 8b, 8c usually have
The switching is controlled so as to store any one of the current (on-air) screen, the next (next) screen, and the secondary (second next) screen. The read data of these three frame memories 8a, 8b, 8c are supplied to a screen effect circuit 9 to perform cut, dissolve, wipe, roll switching, continuous scrolling, or data transfer between the memories according to the requirements of the system. After a predetermined screen effect process such as a program wipe is performed, it is supplied as an image signal to a CRT display 10 as a display device.

[0005] Such video reproduction operation is executed in accordance with the reproduction control data read by the control drive device 3. That is, it follows the playback control program recorded on the disk loaded in the control drive device 3. The audio data recorded on the disk set in the audio drive device 2 is also read out according to the reproduction control program, and after the reproduction device 4 performs predetermined signal processing, drives the speakers 11L and 11R.

However, in such a system, when the control drive device 3 is not connected to the reproducing device 4, or when the control disk is not loaded even if the control drive device 3 is connected, the reproduction device 4 is completely disconnected. It does not operate, and it becomes impossible to reproduce a still image.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for displaying a still image even when a control drive device is not connected, or when a control drive device is connected or a control disk is not loaded. An object of the present invention is to provide a still image file reproducing system capable of reproducing.

[0008]

A still image file reproducing system according to the present invention comprises a recording means for recording a still image file comprising a plurality of still image data, and a recording medium for recording reproduction control data for the still image file. Reading means for reading the recorded data of the recording medium loaded with the data, and the reading means are detachably connected by a connection terminal, and the still image data is read from the recording means in accordance with the read / reproduction control data supplied to the connection terminal. A reproduction control means for reading out data and generating a video signal, wherein the reproduction control means comprises a connection between the first storage means in which preliminary control data is stored in advance and the read means. Detecting means for detecting whether or not the reproduction control data is supplied to the terminal; and, when it is detected that the reproduction control data is not supplied to the connection terminal, preliminary control data from the first storage means. reading It was read playback control data of the - is characterized by having setting means for setting a data.

[0009]

In the still picture file reproducing system according to the present invention, when the reading means is not connected to the reproducing control means or when the recording means is not loaded in the reading means, the reproduction control program is used. Since the reproduction control data is not supplied to the connection terminal of the reproduction control means with the reading means, the preliminary control data is read from the first storage means, and the still picture data is read from the recording means in accordance therewith, and the video signal is read Generating is performed.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a still image file reproducing system according to the present invention. In this still image file reproducing system, an image drive device 22 and a control drive device 23 are detachably connected to a reproduction device 21 constituting the system main body via connection terminals I / O1 and I / O2. In the playback device 21, the image drive device 2
A compression decoder 24 and a control circuit 25 are connected to a connection terminal I / O1 with the second. The compression decoder 24 receives the still image compression data read from the image drive device 22, and restores the JPEG baseline-compressed data in the same manner as the above-mentioned compression decoder 6. .
The switch SW1 is connected to the output of the compression decoder 24. The switch SW1 has two fixed contacts A1 and B1, and the fixed contact A1 is connected to the output of the compression decoder 24. The fixed contact B1 is directly connected to a connection terminal I / O1 with the image drive device 22. Switch SW
The switch SW2 is connected to the selection output of No. 1. The switch SW2 has three fixed contacts A2, B2 and C2, and three frame memories 26a, 26b and 26c are connected to the fixed contacts A2, B2 and C2. The frame memories 26a, 26b, and 26c are frame memories 8a,
As in 8b and 8c, one frame of still image data can be stored, and the storage destination is switched by the switch SW2. The writing and reading of data in the frame memories 26a, 26b and 26c are controlled by a writing and reading circuit (not shown) based on a command from the control circuit 25. A screen effect circuit 27 is connected to each read output of the frame memories 26a, 26b, 26c, and a CRT display 28 is externally connected to an output of the screen effect circuit 27.

A connection terminal I / with the control drive unit 23
O2 is connected to the control circuit 25. The control circuit 25 is composed of, for example, a microcomputer, and commands for reading each data of the image drive device 22 and the control drive device 23, for switching the switches SW1 and SW2, and for controlling the frame memories 26a, 26b and 26c. It issues commands such as data write and read commands, operation commands for the screen effect circuit 27, and the like. The control circuit 25 has a RAM 29 and R
The OM 30 is connected. The RAM 29 is composed of a non-volatile memory, and stores data written when the system is turned off.
Data is maintained without disappearing. A preliminary reproduction control program is written in the ROM 30 in advance.

As shown in FIG. 3, the compression decoder 24 has an entropy decoder 31, an inverse quantization circuit 32, an IDCT
(Inverse Discrete Cosine Transform) It comprises a converter 33 and memories 34 and 35. The entropy decoder 31 performs Huffman decoding of the compressed still image data according to a decoding table stored in the memory 34 in advance. The decoded data is a quantized DCT coefficient, which is inversely quantized by the inverse quantization circuit 32. The inverse quantization is performed using an inverse quantization table written in the memory 35 in advance. The inversely quantized data is supplied to the IDCT converter 3
3 and converted into still image uncompressed data.

The data compression of the JPEG standard is described in "Overview of the International Standard for Color Still Image Coding (Part 1)" (Omachi and Ono, Journal of the Institute of Image Electronics Engineers of Japan, Vol. 20, No. 1).
No. 1991, pp. 50-58), JP-A-63-1988.
This is specifically described in publications such as Japanese Patent No. 103583. Next, the file format of the still image data will be described. The file configuration includes a volume part, a compression parameter part, a disk correspondence table part, a directory part, and a data part. The volume section is a section provided at a fixed sector address of the disk and recording management information on the entire disk. The volume section has a 4-byte management flag area.
It indicates whether or not even one still image data compressed by byte (8 bits) is included. Also,
The volume section is provided with a data information section for recording a directory top sector address, a directory area size, the number of registered directories, a data top sector address, a data section free top sector address, and a data free size.

The compression parameter section has a size of one sector size, is provided at a predetermined sector address for each disk, and records default compression parameters necessary for reproducing compressed data. The compression parameters consist of the above-mentioned inverse quantization table and Huffman decoding table.
The disk correspondence table section is provided on a disk in which the reproduction control information exists, and specifies an image recording disk and an audio recording disk used for the reproduction control. The directory section is a table showing the head sector address of each file in the data section.

The data section comprises a data header and a data body for each file. Depending on the type of data, a body header is provided in the data body. The data header records the information such as the head sector address of the next file, the type of data, the area according to the type of data to be recorded, the size of the data, the size of the body header if there is a body header, and the size of the body. Is done. Data types include compressed data, uncompressed data, reduced data, and the like.

The reproduction control data read by the control drive unit 23 is composed of a header section and a reproduction control data main body. A reproduction control command is described in a time series in the reproduction control data main body to constitute a reproduction control program. This file format complies with NHK Hi-Vision still image disk system technical standards.

Next, the operation of the still image file reproducing system according to the present invention will be described with reference to FIG. It is assumed that the playback device 21 is connected to an image drive device 22 loaded with a disk in which a plurality of still image data are recorded as still image files, and operating means such as a keyboard (not shown) Specifies a still image file recorded on the disc.

The control circuit 25 responds to a command for reproducing a designated still image file from the operating means.
3 is instructed to read the reproduction control data (step S1). Thereafter, it is determined whether or not the reproduction control data has been read and supplied via the connection terminal I / O2 (step S2). When the reproduction control data is read from the disk by the control drive device 23, the reproduction control data is input to an input buffer (not shown) of the control circuit 25.
Therefore, it is determined whether or not the reproduction control data is read from the contents of the input buffer and supplied. When the reproduction control data is supplied, it is determined whether or not the reproduction control data is for the designated still image file (step S3). This is determined, for example, from the contents of the header part of the reproduction control data. If the reproduction control data is that of the designated still image file, the reproduction control data is read as a reproduction control program and written into the RAM 29 (step S4), and the process proceeds to step S14 described later.

On the other hand, if the reproduction control data has not been read, it is determined whether or not a predetermined time or more has elapsed after the generation of the reproduction control data read command (step S5). . If the reproduction control data is not for the designated still image file in step S3, step S5
Execute If the predetermined time has not elapsed, the process returns to step S2. If the predetermined time has elapsed, it is determined whether or not the reproduction control program has already been written in the RAM 29 (step S6). RAM29
If a reproduction control program already exists in the file, it is determined whether or not the reproduction control program is for the designated still image file, as in step S3 (step S3).
7). If it is the reproduction control program for the designated still image file, the process proceeds to step S14. If it is not the reproduction control program for the designated still image file, the image drive device 22 is instructed to read all the directory portions of the specified still image file (step S8), and the directory portion data is supplied. (Step S
9) If directory section data is supplied, it is read (step S10). On the other hand, a preliminary reproduction control program as preliminary control data is read from the ROM 30 (step S11), and unique data such as a different number of still images for each still image file in the read directory part data is stored in the preliminary reproduction control program. (Step S1)
2) Write the preliminary reproduction control program into the RAM 29 as a regular reproduction control program (step S1).
3), proceed to step S14.

In step S14, the control circuit 25
Performs a reproducing operation according to a reproduction control program stored in the RAM 29. That is, each data read command of the image drive device 22, a switch command of the switches SW1 and SW2, a frame
Commands for writing and reading data from the memory 26a, 26b, and 26c, and an operation command for the screen effect circuit 27, and reproduces still image data in order from the data read from the image drive device 22. CRT display 2
8

In the above embodiment, the detecting means for detecting whether or not the reproduction control data is supplied from the control drive device 23 is constituted by executing step S2. A detection circuit may be provided to detect the connection of the control device 23 to the playback device 21 and the loading of the disc in the control drive device 23. Further, in the above-described embodiment, the audio drive device is not provided. However, when the audio drive device is provided, the audio data is read from the disk and the audio signal is output in accordance with the audio data. The generated reproduction control can also be performed according to the preliminary reproduction control program.

[0022]

According to the still picture file reproducing system of the present invention, when the reproduction control data, which is the reproduction control program, is not supplied to the reproducing apparatus through the connection terminal, the first control is performed.
The preliminary control data is read out from the storage means, and the still image data is read out by the image drive device in accordance with the read out control data to generate a video signal. Therefore, even when the control drive device is not connected, or when the control drive device is connected and the recording medium such as the control disk is not loaded, the still image can be reproduced. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a conventional still image file reproduction system.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a compression decoder in the system of FIG. 2;

FIG. 4 is a flowchart showing an operation of a control circuit in the system of FIG. 2;

[Description of Signs of Main Parts]

1, 22 ... image drive device 2 ... audio drive device 3, 23 ... control drive device 4, 21 ... reproduction device 6, 24 ... compression decoder 8a, 8b, 8c, 26a, 26b, 26c: Frame memory 10, 28: CRT display device 25: Control circuit

Claims (3)

(57) [Claims] 1. A recording means for recording a still image file comprising a plurality of still image data, and a recording medium on which a recording medium on which reproduction control data for the still image file is recorded is loaded. Reading means for reading data, and the reading means are detachably connected by a connection terminal, and read out still image data from the recording means in accordance with read / playback control data supplied to the connection terminal to output a video signal. A reproduction control means for generating the still image file, wherein the reproduction control means supplies first control means for preliminarily storing preliminary control data and reproduction control data to the connection terminal. Detecting means for detecting whether or not reproduction control data is not supplied to the connection terminal; reading out the preliminary control data from the first storage means; And a setting means for setting as raw control data. 2. The method according to claim 1, wherein said setting means reads said preliminary control data from said first storage means when said reproduction control data read by said reading means does not correspond to said still image file. 2. The still image file system according to claim 1, wherein the still image file system is set as reproduction control data. 3. The reproduction control means includes: a nonvolatile second storage means for storing the read-out reproduction control data set by the setting means; and a reproduction control data in the connection terminal.
Discriminating means for discriminating whether or not reproduction control data is stored in the second storage means when it is detected that no data is supplied, wherein the discrimination means reproduces the data in the second storage means. When the control means determines that control data is stored, the setting means reads a reproduction control program from the second storage means and sets it as new read reproduction control data. 1. The still image file system according to 1.