JP3075207B2 - Adaptive simple motion JPEG compression apparatus and adaptive simple motion JPEG compression method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to an adaptive simple motion JPEG compression apparatus and an adaptive simple motion JPEG compression method for creating a compressed image conforming to the EG (Joint Picture Expert Group / International Standardization Working Group for Color Still Image Coding).

[0002]

2. Description of the Related Art Conventionally, Huffman coding and the like have been used for compression / reproduction of image data. FIG. 5 is a block diagram showing a configuration example of a conventional general image data compression apparatus. In the moving image reproduction of the image data compression device of the first conventional example, reproduction is possible by preparing a reproduction decoder device conforming to the MPEG standard. However, the device becomes expensive.

[0003] Therefore, by continuously reproducing images conforming to the JPEG standard, apparently moving images can be reproduced. Adaptive simple motion JPEG compression apparatus and adaptive simple motion JPE using this JPEG standard
In general, in the G compression method, an inexpensive moving image reproducing apparatus and method can be configured.

For example, Japanese Patent Application Laid-Open No. 5-28445 of the prior art 2
The "information recording / reproducing apparatus" disclosed in Japanese Patent Publication No. 4 (1999) includes a compression / expansion device for compressing and recording a digital video signal according to the JPEG standard, and expanding and reproducing the reproduction compressed data according to the JPEG standard. This compression / expansion device is constituted by a moving image radar that performs a switching operation every frame scanning period.

[0005] In the "compression image coding apparatus" disclosed in Japanese Patent Application Laid-Open No. H5-115055, the component image signal is switched to an LPF for limiting the frequency band by a switch, and then input to an A / D converter for digital information. , A DCT transformer, a quantizer, and a Huffman encoder reduce the data amount. Further, the compressed image data is accumulated by the FIFO and output at a constant data rate. The signal of the OF detector for detecting the amount of data stored in the FIFO is given to the control terminal of the switch,
By limiting the frequency band of the image signal before compression so that O does not overflow, it works to make the compressed image data rate constant and constitutes an image compressor with a fixed data rate.

[0006]

However, the technique of the above-mentioned prior art 2 is an apparatus having only a function of continuously reproducing still images. Further, in the third conventional example, even if the compression ratio setting function is provided, once the compression ratio is set to a certain value, the encoding is performed at the compression ratio until the end. In addition, since there is a limit on the transfer rate of data from the recording medium of the compressed data reproducing apparatus, it takes a very long time to complete encoding work for the deterioration of image quality and the amount of data.

When the problems of the above conventional example are examined in more detail, the following problems arise in obtaining efficient moving image data. A first problem is that if a compression rate is set once when compressing a moving image, encoding is performed at the same compression rate until the end. For this reason, since the compression ratio is constant even when the scene (scene) changes, a redundant image or too much compression depending on the scene, that is, an image in which the image quality is deteriorated occurs.

The second problem is that it is necessary to perform compression while minimizing image quality degradation while taking the transfer rate into consideration, so that it is necessary to confirm the encoding operation many times.

The present invention provides an adaptive simple motion JPEG in which the amount of data is suppressed and good moving image compressed data is obtained.
An object of the present invention is to provide a compression apparatus and an adaptive simple motion JPEG compression method.

[0010]

In order to achieve the above object, an adaptive simple motion JPE according to the first aspect of the present invention is provided.
The G compression device is configured to output a current signal of a moving image, a signal before one field,
Scene determination means for performing a scene determination based on a signal after one field, selection means for selecting a frame rate based on the result of the scene determination, and a frame selected by the selection means
・ Pressure based on the scene judgment result for the rate image data
Quantization control means for controlling the reduction ratio;
Video signal according to the transfer rate of the compressed image data
Performs level control and controls the image signal level.
A gain controller that outputs a signal to the scene determination means
And compression of image data adapted to a predetermined transfer rate.

[0011] The predetermined transfer rate may be a transfer rate to a recording medium for recording the compressed image data.

Further, the adaptive simple motion JPEG compression apparatus has overall operation control means for controlling the operation of the entire apparatus, and the overall operation control means automatically controls the compression operation to an optimum level within the transfer rate. Good to do.

According to a fourth aspect of the present invention, there is provided an adaptive simplified motion JPEG compression method, wherein a scene determination step of performing a scene determination based on a current signal of a moving image, a signal before one field, and a signal after one field, and a frame based on a result of the scene determination.・
A selection step of selecting a rate selected by the selection means
Scene decision result for frame rate image data
A quantization control step of controlling the compression ratio by
According to the transfer rate of the image data compressed by the
A gain controller process for controlling the video signal level;
And compression of image data adapted to a predetermined transfer rate.

The predetermined transfer rate may be a transfer rate to a recording medium for recording the compressed image data.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an adaptive simplified motion JPEG compression apparatus and an adaptive simplified motion JPEG compression method according to an embodiment of the present invention. 1 to 4 show an embodiment of an adaptive simplified motion JPEG compression apparatus and an adaptive simplified motion JPEG compression method according to the present invention.

FIG. 1 shows an example of a system configuration to which an adaptive simplified motion JPEG compression apparatus and an adaptive simplified motion JPEG compression method are applied. In FIG. 1, the adaptive simplified motion JPEG compression apparatus of the present embodiment is configured as a system in which the output of a VTR (Video Tape Recorder) 1 is connected to two systems to an encoder body, and a hard disk 11 is connected to an output unit. Have been.

The encoder body includes a VTR 1, a GC (gain control) 2, an A / D (AD converter) 3,
PLL (Phase Locked Loop) 4, SG (Signal Generator) 5, PRI PROCESS C
ONTROL6, DCT (Discrete Cosine Transform Block)
7, a quantization (quantization block) 8, a Huffman coding (Huffman coding block) 9, and a decoder 10.

An adaptive simple motion JPEG having the above configuration
In the compression device, the material of the moving image compressed to the VTR 1 is
The hard disk 11 stores the compressed data. The encoder main body is a device for compressing a moving image material.

First, a video tape of a moving picture material is placed in a VTR1.
And the data is supplied to the encoder main body. The supplied video signal is split into two, the first signal is
The level is adjusted in the GC2 section, and the analog signal is converted to a digital signal in the A / D3 block, and PRE PRO
Input to CESS CONTROL6. Also, the second signal is synchronized by the PLL4 block,
The timing signal is generated in 5 parts and PRE PROCESS
Input to CONTROL6.

PRE PROCESS CONTROL
6, scene determination of the moving image data, GC2 control, thinning control, and quantization control are performed.
Is input to DCT is performed by DCT 7, quantization is performed by quantization 8, and Huffman coding 9 is performed.
It becomes JPEG compressed data. The data is recorded on the hard disk 11 and is subjected to inverse conversion of the JPEG compressed data by the decoder 10 and output to the monitor for confirming the compressed data in real time.

FIG. 2 shows PRE PROCESS C.
3 shows a more detailed first configuration example inside the ONCONTROL 6.
The digital signal of A / D3 is stored in a field memory (ME
M) 12, a field memory (MEM) 13, a difference detector (DET) 14 performs a scene determination based on a current signal, a signal before one field, and a signal after one field, and based on the result, a selector controller (sel).
(cont) 16 controls the thinning of the selector (select) 15. In addition, quantization / controller (co
At nt) 17, the compression ratio of the quantized block is controlled.
Further, the compressed data from the Huffman coded block is rate detected by a transfer rate detector (DET) 19, and as a result, a gain control controller (GC con
t) At 18, control the level of GC2.

Next, an operation example of this embodiment will be described in detail with reference to FIGS. As an operation procedure of this device, PLAY is transferred from the transfer rate DET19 to the VTR1.
Give instructions. Playback is performed once, and if the rate falls within the transfer rate (S1 / Yes), the process ends. If not (S1 / No), transfer rate D
The ET 19 issues a REW instruction to the VTR 1, and when the REW is completed, the reproduction is performed again. Next, with the difference DET14
Selcont if frame rate can be reduced
16 controls select15 to perform thinning (S
2). As a result, if it is within the transfer rate (S3 / Ye
s) End. If not (S3 / No), REW and PLAY are transferred from the transfer rate DET19 to the VTR1 again.
Is performed.

Next, GC2 is controlled by GC cont18 (S4). As a result, if the transfer rate is within the transfer rate (S5 / Yes), the process is terminated.
o), REW from the transfer rate DET19 to the VTR1 again
And PLAY.

Next, as a result of the seal determination based on the difference DET14,
For scenes that can be compressed, quantization cont17
To control the quantization 8 (S6). If the result is within the transfer rate (S7 / Yes), the process ends. Otherwise (S7 / No), control of the quantization 8 part (S6)
Are repeatedly executed (S6, S7).

FIG. 3 shows the PRE PROCESS CONT.
4 shows a more detailed second configuration example inside the ROL 6. That is, FIG. 3 shows another different embodiment adapted to the pre-processing unit of FIG.

In FIG. 3, the transfer rate DET 19, sel cont 16, quantization cont 17, GC c
A system in which each block of ont18 is replaced by a one-chip microcomputer and controlled by a program is adopted.

Thus, the frame rate suitable for the scene is
Control the video signal level and control the compression ratio
As a result, the amount of data is reduced, and
Is obtained.

Therefore, in order to perform optimization with the conventional apparatus, a compression ratio is manually set for each scene (scene), and a great deal of manual work has occurred. , And the optimal compression ratio can be automatically set. In order to enable this processing, the adaptive simplified motion JPEG compression apparatus or method of the present embodiment compares the image one field before and one field after in the moving image compression procedure, and according to the result, the compression ratio Decision or drop frames. The pre-processed data is subjected to DCT, quantized according to the compression ratio, and finally subjected to Huffman coding to obtain JPEG data. Also, compression is performed in consideration of the data transfer speed of the target reproducing apparatus.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

[0030]

As is clear from the above description, the adaptive simple motion JPEG compression apparatus and the adaptive simple motion JPEG compression method of the present invention can be applied to the present embodiment of the present invention.
Scene determination is performed based on the pre-field signal and the post-field signal. According to the result of this scene judgment,
Select the rate, control the video signal level, and
Control. Therefore, it is possible to compress the image data adapted to the predetermined transfer rate. According to this procedure, the compression ratio according to the scene can be automatically controlled by performing processing on the moving image data before performing compression and performing scene determination. In addition, by monitoring the compressed data at the transfer rate DET and taking into account the transfer rate of reproduction, it is possible to obtain compressed data giving priority to image quality.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration example applied to an embodiment of an adaptive simple motion JPEG compression apparatus and an adaptive simple motion JPEG compression method according to the present invention.

FIG. 2 is a block diagram illustrating a more detailed first configuration example of a preprocessing unit.

FIG. 3 is a block diagram showing a more detailed second configuration example of a preprocessing unit.

FIG. 4 is a flowchart showing an operation example.

FIG. 5 is a block diagram illustrating a configuration example of a conventional general image data compression apparatus.

[Explanation of symbols]

 1 VTR (Video Tape Recorder) 2 GC (Gain Control) 3 A / D (AD Converter) 4 PLL (Phase Locked Loop) 5 SG (Signal Generator) 6 PRE PROCESS CONTROL 7 DCT (Discrete Cosine Transform) 8) Quantization (quantization block) 9 Huffman coding (Huffman coding block) 10 Decoder 11 Hard disk 12 Field memory 13 Field memory 14 Difference detector 15 Selector 16 Selector controller 17 Quantization controller 18 Gain control・ Controller 19 Transfer rate detector 20 Microcomputer

Claims (5)

(57) [Claims] 1. A current signal of a moving image, a signal before one field,
A scene determination unit for performing scene determination by one field after the signal, the scene selecting means for selecting a frame rate as a result of the determination, the image of the frame rate selected by said selection means
Control of compression ratio for data based on the scene determination result
And a transfer rate of the image data compressed by the quantization control means.
Control the video signal level according to the
Outputs a bell-controlled image signal to the scene determination means
An adaptive simple motion JPEG compression apparatus , comprising: a gain controller for performing compression of image data adapted to a predetermined transfer rate. 2. The adaptive simple motion J according to claim 1, wherein the predetermined transfer rate is a transfer rate to a recording medium for recording the compressed image data.
PEG compression device. 3. The adaptive simple motion JPEG compression apparatus further comprises an overall operation control means for controlling the operation of the entire apparatus, wherein the overall operation control means controls the compression operation to an optimum value within the transfer rate. 3. The adaptive simple motion JPEG compression apparatus according to claim 1, wherein the control is automatically performed to a level. 4. A current signal of a moving image, a signal before one field,
A scene determination step of performing a scene determination based on a signal after one field, a selection step of selecting a frame rate based on the result of the scene determination, and an image of the frame rate selected by the selection unit
Control of compression ratio for data based on the scene determination result
And a transfer rate of the image data compressed by the quantization control means.
Gain control that controls the video signal level according to the
Over La and a process, the adaptive Fast Motion JPEG compression method which is characterized in that the compression of the image data adapted to a predetermined transfer rate. 5. The adaptive simple motion J according to claim 4, wherein the predetermined transfer rate is a transfer rate to a recording medium for recording the compressed image data.
PEG compression method.