JPH1066092A - Video data compressor and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply compression coding to video data in real time without deteriorating the quality of a video image of a scene change part. SOLUTION: An encoder control section 12 calculates sequentially a difference between two pictures (inter-frame residual value). A host computer 20 monitors a secular change of the inter-frame residual value and when the inter-frame residual value reaches a multiple of 1.5 or over in comparison with a just preceding inter-frame residual value, a border (scene change) of two video data in a time direction is detected. When the scene change is detected, the host computer 20 changes a picture sequence so that the quality of the video image is not deteriorated and the data amount assigned to each picture is calculated. An encoder 18 applies compression coding to video data based on the revised picture sequence and object data amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video data compression apparatus for compressing and encoding non-compressed video data and a method thereof.

[0002]

2. Description of the Related Art For example, MPEG (moving picture expe
In the rts group) system, uncompressed digital video data is converted into a GOP (g) composed of an I picture (intra coded picture), a B picture (bi-directionaly coded picture), and a P picture (predictive coded picture).
roup of pictures) Compression-encodes in units.

When such an MPEG system is adopted, a plurality of uncompressed video data (hereinafter, also referred to as a scene) which are not correlated in a time direction are connected by editing processing to form one uncompressed video data (hereinafter, also referred to as a scene). Edited video data)
This edited video data is, for example, a picture type sequence I, B, P, B, P, B, P, B, P, B, P,
When compression encoding is performed using B, the first picture of the scene after the compression encoding may be a P picture. In order to decompress and decode the first P picture, it is necessary to refer to the immediately preceding picture. However, since this is compressed video data generated from another scene, the first P picture is not correlated with the decompressed decoding of the first P picture. If a limited amount of data can be used, the picture after decompression decoding will be degraded. Resulting in.

In order to solve such a problem, for example,
JP-A-7-193818 discloses an image processing method and an image processing apparatus. JP-A-7-193818
The image processing method and the image processing apparatus disclosed in Japanese Patent Application Laid-Open No. H10-15095 convert uncompressed edited video data including, for example, two scenes (a first scene and a second scene) into, for example, the picture type sequences I, B, P, B, P, B,
When compression encoding is performed using P, B, P, B, P, and B, second compressed video data obtained by compressing and encoding the second scene (I ₂ , B ₂ , P in the picture type sequence shown below)
₂ ) the first P picture is an I picture which does not refer to the last picture of the first compressed video data (I ₁ , B ₁ , P ₁ in the picture type sequence shown below) obtained by compression encoding the first scene. In order to suppress an increase in the amount of generated data, compression encoding is performed by changing the last I picture of the first compressed video data to a P picture.

That is, specifically, Japanese Patent Application Laid-Open No. 7-19381
The image processing method and image processing apparatus disclosed in 8 JP compresses encoded without changing the picture type sequence, the first compressed image data and second compressed image data, picture type sequence B ₁ , I ₁ ,
B ₁ , P ₁ , B ₁ , P ₁ , B ₁ , P ₂ , B ₂ , P ₂ , B
₂ , P ₂ , B ₂ , the last I picture of the first compressed video data is changed to a P picture, and the first P picture of the second compressed video data is changed to an I picture. To compress and encode the picture type sequences B ₁ , P ₁ , B ₁ , P ₁ , B ₁ , P ₁ , B ₁ ,
The first and second compressed video data of I ₂ , B ₂ , P ₂ , B ₂ , P ₂ , and B ₂ are obtained.

On the other hand, for example, when recording compressed video data that has been compression-encoded by the MPEG system on a recording medium such as a magneto-optical disk (MO disk; magneto-oprical disc), the compressed video data after compression-encoding is used. The data amount (bit amount) of the data must be equal to or less than the recording capacity of the recording medium or equal to or less than the transmission capacity of the communication line while maintaining high quality of the video after the decompression decoding. For this purpose, first, the non-compressed video data is preliminarily compression-encoded and the data amount after the compression and encoding is estimated (first pass). Next, the compression rate is adjusted based on the estimated data amount, and the compression is adjusted. A method of performing compression encoding (second pass) again so that the data amount after encoding becomes equal to or less than the recording capacity of the recording medium is employed (hereinafter, such a compression encoding method is also referred to as “complete two-pass encoding”). Write).

[0007]

However, when compression encoding is performed by the above-described complete two-pass encoding, the same compression encoding processing is performed on the same uncompressed video data.
It has to be applied twice, which takes time. Further, since the final compressed video data cannot be generated by one compression encoding process, the captured video data cannot be directly compression-encoded in real time, recorded, or transmitted.

Therefore, in order to enable real-time compression encoding, the non-compressed image data is input to a frame delay circuit using a FIFO and a first encoder. The information of the difficulty (difficulty) is obtained for the time, and the uncompressed image data delayed by the frame delay circuit and the information of the deficitity from the first encoder are output to the second encoder. Then, in the second encoder, there has been proposed a method of encoding input non-compressed image data based on target bits determined based on difficulty information from the first encoder. A simple compression encoding method is also referred to as “simple two-pass encoding”).

By the way, if such a simple two-pass encoding is employed, in the above-described editing processing, a plurality of uncompressed video data (hereinafter, also referred to as scenes) which are not correlated in the time direction are connected continuously to form one image. When performing compression encoding after converting to uncompressed video data (edited video data),
It is conceivable to detect a scene change using the difficulty obtained by the first encoder. That is, it is conceivable to combine the function of changing the picture type with a scene change and the rate assignment function in picture units by a simple two-pass. However, this has the following problems. That is, in the detection of the difficulty performed in the first pass, encoding is performed in the original GOP phase without taking measures against scene changes, and the difficulty is measured from the amount of bits generated thereby. Next, a scene change is detected based on the measured difficulty, and the picture type is changed (replaced). However, as a result of changing the picture type in this way, when actual encoding is performed in the second pass, encoding is performed with a picture type different from the picture type whose diffuseness has been measured. There is a problem that it is not used properly.

[0010] The present invention has been made in view of the above-mentioned problems of the prior art.
Compressed video data can be generated by compressing and encoding video data continuously including a plurality of scenes to a predetermined data amount or less, and furthermore, a boundary (scene change) portion in a time direction of a plurality of continuous scenes is determined. It is an object of the present invention to provide a video data compression device and a video data compression method capable of maintaining the quality of a video obtained as a result of decompression decoding of compressed video data.

According to the present invention, video data including a scene change and a camera flash can be compression-encoded at a high compression rate, and the encoding distortion generated before and after the scene change and the camera flash is significantly reduced. It is an object of the present invention to provide a video data compression device and a video data compression method capable of performing the same.

[0012]

To achieve the above object, according to the Invention The video data compression apparatus according to the present invention, the non-compressed video data successively, each by a predetermined delay time T _k (n-
1) (n-1) delay means delayed in stages,
n, k are integers, 2 ≦ n, 1 ≦ k ≦ n), each of the uncompressed video data or the (n−1) delay means sequentially delays the uncompressed video data by a predetermined number. Compression encoding means for generating compressed video data by performing compression encoding by the compression encoding method of
And an additional data generation unit for generating predetermined additional data from the compressed video data generated by the first compression encoding unit. The k-th compression encoding unit may include: , Based on the additional data generated from the compressed video data generated by the (k-1) th compression encoding means, the first to (k-1) th delay means sequentially delay the Compression encoding the uncompressed video data.

Preferably, the head picture includes one (n = 2) of the delay units and two of the compression encoding units, and is the first picture after compression encoding of each of a plurality of continuous non-compressed video data. Means for changing the order of the pictures of the plurality of uncompressed video data so that the picture becomes a P picture or an I picture; Further comprising a difference value / prediction error calculating means for calculating a prediction error value;
Compression encoding means compresses and encodes the plurality of uncompressed video data in which the order of pictures has been changed by a predetermined compression encoding method having a predetermined picture type sequence, and includes a first encoding method including a plurality of types of pictures. The compressed video data is generated, the delay unit delays the uncompressed video data by a time during which the uncompressed video data is input for a predetermined number of pictures, and the additional data generation unit generates the calculated difference value Alternatively, the plurality of non-compressed video data are compressed and encoded based on the prediction error value and the data amount of the first compressed video data generated while a predetermined number of pictures of the uncompressed video data are input. Target value data indicating the target value of the data amount of the compressed video data after the compression, as the additional data, a compression value obtained by compression-coding the same uncompressed video data. To have only a correlation data of picture image data to generate for each picture,
Among the two compression encoding units, the second compression encoding unit converts the plurality of delayed uncompressed video data into the first
And compression encoding is performed by a compression encoding method corresponding to the compression encoding method of the compression encoding means, and second compressed video data corresponding to each of the plurality of uncompressed video data is generated.

Preferably, the first compression encoding means includes:
The plurality of uncompressed video data in which the order of pictures has been changed is compression-encoded to generate the first compressed video data including at least an I picture and a P picture, and the additional data generation unit calculates the calculated difference Boundary detecting means for detecting a temporal boundary of the plurality of uncompressed video data based on a change in the value or the prediction error value, and compression-encoding a picture of a temporal boundary of the plurality of uncompressed video data. Target value data indicating a target value of the data amount of the compressed video data after the compression, based on the data amount of the picture included in the first compressed video data generated from the same uncompressed video data. Calculation means, wherein the second compression encoding means converts the first picture of each of the plurality of delayed uncompressed video data into an I picture. By condensation coding, to generate the second compressed video data.

Preferably, the second compression encoding means includes:
The last I picture of the second compressed video data corresponding to each of the plurality of uncompressed video data is changed to a P picture and compression-encoded to generate the second compressed video data.

A video data compression device according to the present invention is a device for compression-coding edited video data in which uncompressed video data of a plurality of scenes are connected in succession, wherein the order changing means comprises The data pictures are rearranged in an order suitable for compression encoding. At this time, the order changing means changes the order of the pictures of the edited video data so that the first picture after compression coding of each of the plurality of continuous non-compressed video data becomes a P picture or an I picture. The difference value / prediction error calculating means calculates a difference value (inter-frame residual) or a prediction error value (ME residual) between two adjacent pictures included in the edited video data after the picture order is changed. Calculate sequentially.
The first compression encoding unit converts the edited video data into, for example,
According to a method such as MPEG, compression encoding is performed with a predetermined picture type sequence to generate first compressed video data.

[0017] The delay means is provided only for a time during which the data amount can be allocated to each picture of the edited video data.
That is, the uncompressed video data is delayed by a time necessary for inputting a predetermined number of pictures of the edited video data and collecting an amount of data required for the data allocation process. The additional data generation unit monitors a temporal change in the value of the inter-frame residual or the ME residual calculated by the difference value / prediction error value calculation unit, and one of these values increases, for example, in an impulse form. The determined portion is determined as a boundary (scene change) in the time direction between a plurality of pieces of video data included in the edited video data.

Further, the additional data generating means compresses based on the presence or absence of a scene change and the data amount of the first compressed video data generated from the number of pictures of the edited video data corresponding to the delay time of the delay means. A target value (target value data) of a data amount to be allocated to each picture of the edited video data after encoding is calculated. At this time, the additional data generation means calculates the target value data by a process that straddles the video data of different scenes, and performs the same process by closing the same video data so that the quality of the video is not degraded. The target value data is calculated so as to have a correlation only with the data amount of the picture of the compressed video data generated from the video data. The second compression encoder encodes a plurality of non-compressed video data delayed by the delayer in the same manner as the first compression encoder by, for example, an MPEG method to generate second compressed video data. .

[0019] The video data compression method according to the present invention, the non-compressed video data sequentially, successively by a predetermined delay time T _k, and delayed (n-1) stages (n, k is an integer, 2 ≦
n, 1 ≦ k ≦ n), each of the uncompressed video data or the uncompressed video data delayed by k stages is compression-coded by a predetermined compression coding method to generate n + 1 compressed video data. A video data compression method for generating predetermined additional data from the compressed video data generated from each of the uncompressed video data delayed in the first to (n-1) th stages; The compression encoding of the uncompressed video data is performed based on the additional data generated from the uncompressed video data delayed in the (k-1) th stage.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of the present invention will be described. By the video data compression coding method such as the MPEG method, when compression coding of a video data having a high degree of difficulty (difficulty) such as a pattern having many high frequency components or a pattern having a lot of motion is generally accompanied by compression. Distortion is likely to occur.
For this reason, it is necessary to compress and encode video data having a high degree of difficulty at a low compression ratio. For compressed video data obtained by compressing and encoding data having a high degree of difficulty, a compressed image of video data having a pattern having a low level of difficulty is obtained. It is necessary to allocate a larger amount of target data than data.

As described above, in order to adaptively allocate a target data amount to the degree of difficulty of video data, the two-pass encoding method shown as a conventional technique is effective. However, the two-pass encoding method is not suitable for real-time compression encoding. The simplified two-pass encoding method shown as the first embodiment has been made to solve the problem of the two-pass encoding method, and the compressed video data obtained by preliminary compression-encoding the non-compressed video data The difficulty level of the uncompressed video data is calculated from the difficulty level data, and the FI level is calculated based on the difficulty level calculated by the preliminary compression encoding.
The compression rate of the uncompressed video data delayed by a predetermined time by the FO memory or the like can be adaptively controlled.

FIG. 1 is a diagram showing a configuration of a video data compression device 1 according to the present invention. As shown in FIG. 1, the video data compression apparatus 1 includes a compression encoding unit 10 and a host computer 20. The compression encoding unit 10 includes an encoder control unit 12, a motion estimator 14,
Delay / compression encoding unit 16, first encoder
18 (# 1), the delay / compression encoding unit 16
Is a FIFO memory 160 and a second encoder 16
2 (# 2). The video data compression device 1
With these components, the above-described simple two-pass encoding is realized for uncompressed video data VIN input from an external device (not shown) such as an editing device and a video tape recorder device.

In the video data compression device 1, a host computer 20 controls the operation of each component of the video data compression device 1. Also, the host computer 20
The data amount of the compressed video data generated by the encoder 162 of the delay / compression encoding unit 16 preliminarily compression-encoding the non-compressed video data VIN, the value of the DC component (DC component) of the DCT-processed video data, and the DC The power value of the component (AC component) is received via the control signal C16, and the difficulty of the picture of the compressed video data is calculated based on the received values.
Further, the host computer 20 based on the calculated difficulty, assigned to each picture of the target amount of data T _j of the compressed video data encoder 18 is generated via a control signal C18, the quantization circuit 166 of the encoder 18 (FIG. 4 ), And the compression rate of the encoder 18 is adaptively controlled on a picture basis.

The motion detector 14 calculates a motion vector of the non-compressed video data and a difference value between frames (inter-frame residual), and calculates the motion vector and the inter-frame residual by the encoder controller 12 and the encoders 162 and 18.
, And outputs the inter-frame residual to the host computer 20 via the control signal c19. Here, the residual between frames calculated by the motion detector 14 is defined as shown in Expression 1 below.

[0025]

(Equation 1)

That is, as shown in Equation 1, the inter-frame residual (Δ) is calculated by calculating the pixel value (Y _i ) of the pixel of the currently input frame and the pixel at the same position of the immediately preceding frame. The absolute value of the difference from the pixel value (R _i ) [| Y _i −R _i |, and the squared value of the difference (Y _i −R _i ) ² ]
It is defined as a value obtained by cumulatively adding all the pixels of the frame. This frame-to-frame residual is usually obtained by converting a movie film image (24 frames / second) into a video signal (30 frames / second).
In the 2-3 pull-down process that uses the difference in the number of frames per second to increase the compression efficiency when converting the video signal into adjacent frames in the video signal obtained as a result of the processing, It is used to determine whether or not it is included in the same frame of the film image.

FIG. 2 shows the encoder controller 1 shown in FIG.
FIG. 2 is a diagram illustrating a configuration of a second embodiment. As shown in FIG. 2, the encoder control unit 12 includes a picture rearranging circuit 120, a scan conversion blocking circuit 122, a frame memory circuit 12
4. Adder circuit 126 and picture type controller 12
8. With these components, the encoder control unit 12 notifies the host computer 20 of the presence or absence of a picture of the uncompressed video data VIN, and performs preprocessing for compression encoding for each picture of the uncompressed video data VIN. .

In the encoder control unit 12, the frame memory circuit 124 stores the input uncompressed video data VI
N is given a predetermined delay time, for example, a delay time such as M uncompressed video data VIN (M is the interval between P pictures) and output to the picture rearranging circuit 120 and the adding circuit 126. Picture rearrangement circuit 1
Reference numeral 20 denotes a picture type control unit 128 for the uncompressed video data VIN that has not been delayed and the uncompressed video data VIN that has been delayed by the frame memory circuit 124.
6 based on the picture type input from
As will be described later with reference to (A) and (B), a process of rearranging in encoding order is performed.

The scan conversion blocking circuit 122 performs picture / field conversion on the uncompressed video data VIN, and performs 3: 2 pull-down processing (30 frames / frame) when the uncompressed video data VIN is movie video data.
Second video data of 24 seconds per movie, and removes redundancy before compression encoding, etc.), and further converts the video data after these processes into macroblocks. To generate the video data S12 and output it to the FIFO memory 160 and the encoder 162 of the delay / compression encoding unit 16.

The adder circuit 126 outputs the undecompressed uncompressed video data VIN and the frame memory circuit 124
In this case, the difference value of the uncompressed video data delayed by the delay time of one frame is calculated irrespective of the P picture interval, and output to the picture type control unit 128. The picture type control unit 128 controls the motion detector 14
Based on the inter-frame residual generated by
Reference numerals 2 and 18 designate the picture type (I-picture, P-picture and B-picture) of a frame generated by compression-coding each frame of the uncompressed video data.

The delay / compression encoding unit 16
The O memory 160 converts the video data S12 input from the encoder control unit 12 into, for example, the uncompressed video data VI.
N is delayed by the time of L (L is an integer) picture input, and is output to the encoder 18 as delayed video data S16.

FIG. 3 is a diagram showing a configuration of the encoder 162 of the delay / compression encoder 16 shown in FIG. The encoder 162 includes, for example, as shown in FIG.
64, DCT circuit 166, quantization circuit (Q) 168, variable length coding circuit (VLC) 170, inverse quantization circuit (I
Q) This is a general video data compression encoder composed of 172, an inverse DCT (IDCT) circuit 174, an addition circuit 176, and a motion compensation circuit 178, and compresses input video data S12 by the MPEG method or the like. Encoding,
The data amount and the like of each picture of the compressed video data are output to the video encoder 20.

The addition circuit 164 subtracts the output data of the addition circuit 176 from the video data S12,
6 is output. The DCT circuit 166 includes the addition circuit 1
For example, the video data input from 64 is converted to 16 pixels ×
Discrete cosine transform (D
CT), converts the data in the time domain into the data in the frequency domain, and outputs the data to the quantization circuit 168. Further, the DCT circuit 166 controls the DCT of the video data after the DCT.
Component value and the AC component power value
Output to

The quantization circuit 168 converts the frequency domain data input from the DCT circuit 166 into a fixed quantization value Q
And the variable length coding circuit 17 as quantized data.
0 and output to the inverse quantization circuit 172. The variable-length coding circuit 170 performs variable-length coding on the quantized data input from the quantization circuit 168, and converts the amount of compressed video data obtained as a result of the variable-length coding into a control signal C
16 to the host computer 20. The inverse quantization circuit 172 inversely quantizes the quantized data input from the variable length encoding circuit 168, and outputs the inversely quantized data to the inverse DCT circuit 174.

The inverse DCT circuit 174 includes the inverse quantization circuit 17
Inverse DCT processing is performed on the inversely quantized data input from 2 and output to the adding circuit 176. Addition circuit 1
76 is the output data of the motion compensation circuit 178 and the inverse DC
The output data of the T circuit 174 is added and output to the addition circuit 164 and the motion compensation circuit 178. The motion compensation circuit 178 performs a motion compensation process on the output data of the addition circuit 176 based on the motion vector input from the motion detector 14 and the picture type input from the encoder control unit 12. 176 is output.

FIG. 4 is a diagram showing a configuration of the encoder 18 shown in FIG. As shown in FIG.
Has a configuration in which a quantization control circuit 180 is added to the encoder 162 shown in FIG. The encoder 18
With these components, the FIFO memory 1 is controlled based on the target data amount _Tj set from the video encoder 20.
60, the delayed video data S delayed by L pictures
16 to perform a motion compensation process, a DCT process, a quantization process, and a variable-length encoding process to generate compressed video data VOUT of the MPEG system or the like, and output it to an external device (not shown).

In the encoder 18, the quantization control circuit 180 sequentially monitors the data amount of the compressed video data VOUT output from the variable length quantization circuit 170, and finally, from the j-th picture of the delayed video data S 16 The data amount of the generated compressed video data is
, The quantization value Q _j set in the quantization circuit 168 is sequentially adjusted so as to approach the set target data amount T _j . The variable length quantization circuit 170 outputs the compressed video data VOUT to the outside,
And outputs the actual data amount _Sj of the compressed video data VOUT obtained by compression-encoding to the host computer 20 via the control signal C18.

Hereinafter, a simple two-pass encoding operation of the video data compression apparatus 1 according to the first embodiment will be described. FIGS. 5A to 5C are diagrams illustrating the operation of the simple two-pass encoding of the video data compression device 1 according to the first embodiment. The encoder control unit 12 controls the video data compression device 1
The non-compressed video data VIN input to the encoder is subjected to pre-processing such as rearranging the pictures in the encoding order by the encoder control unit 12, and as shown in FIG. 162. Note that the encoder control unit 12
, The order of picture encoding shown in FIG. 5 and the like differs from the order of display after decompression decoding.

The FIFO memory 160 delays each picture of the input video data S12 by L pictures and outputs the delayed picture to the encoder 18. Encoder 16
Reference numeral 2 denotes a data amount of compression-encoded data obtained by compression-encoding a picture of the input video data S12 in a preliminary and sequential manner, and compression-encoding a j-th (j is an integer) picture; And outputs the DC component value and AC component power value of the video data to the host computer 20.

For example, since the delayed video data S16 input to the encoder 18 is delayed by L pictures by the FIFO memory 160, as shown in FIG. j
When the (j is an integer) -th picture (picture b in FIG. 5B) is compression-encoded, the encoder 162
Is the (j + L) -th picture L pictures ahead of the j-th picture of the video data S12 (FIG. 5).
This means that the picture a) in (B) is compression-encoded. Therefore, when the encoder 18 starts the compression encoding of the j-th picture of the delayed video data S16,
The encoder 162 has already completed the compression encoding of the j-th to (j + L-1) -th pictures (the range c in FIG. 5B) of the video data S12, Difficulty data D _j , D _{j + 1} , D _{j + 2} ,
, Dj _{+ L-1} have already been calculated by the host computer 20.

The host computer 20 calculates the following equation (2).
As a result, the encoder 18 sets the j-th
A target data amount T _j to be allocated to the compressed video data obtained by compression-coding the third picture is calculated, and the calculated target data amount T _j is set in the quantization control circuit 180.

[0042]

(Equation 2)

Where D _j is the video data S
12 is the actual difficulty data of the 12 th picture,
R ′ _j is the average of the target data amount that can be allocated to the j-th to (j + L−1) -th pictures of the video data S12 and S16, and the initial value of R ′ _j (R ′
₁ ) is a target data amount that can be allocated to each picture of the compressed video data on average, and is expressed by the following equation (3). Each time the encoder 18 generates one picture of the compressed video data, Updated as shown.

[0044]

(Equation 3)

[0045]

(Equation 4)

Note that the numerical bit rate (Bit rat
e) indicates the amount of data (bit amount) per second determined based on the transmission capacity of the communication line and the recording capacity of the recording medium, and the picture rate is the rate per second included in the video data. Indicates the number of pictures (30 pictures / sec (NTSC), 25 pictures / sec (PAL))
_{j + L} indicates the average data amount per picture determined according to the picture type. DC of encoder 18
The T circuit 166 performs DCT processing on the j-th picture of the input delayed video data S16, and
Output to The quantization circuit 168 is a DCT circuit 1
The data of the j-th picture of the frequency domain input from 66, the quantization control circuit 180 is the target data amount T _j
Quantized by the quantization value Q _j adjusted based on the outputs, to the variable length encoding circuit 170 as quantized data. Variable-length coding circuit 170, and variable length coding the j-th picture of the quantized data inputted from the quantization circuit 168, substantially, it generates the compressed video data VOUT of the data amount close to the target amount of data T _j And output.

Similarly, as shown in FIG. 5B, when the encoder 18 compresses and encodes the (j + 1) -th picture (picture b 'in FIG. 5C) of the delayed video data S16. , The encoder 162 completes the compression encoding of the (j + 1) -th to (j + L) -th pictures (the range c ′ in FIG. 5C) of the video data S12,
The actual difficulty data D _{j + 1} , D _{j + 2} , D of these pictures
_{j + 3} ,..., D _{j + L} have already been calculated by the host computer 20.

The host computer 20 uses the following equation (2).
The encoder 18 determines the (j + 1) th of the delayed video data S16.
A target data amount T _{j + 1} to be allocated to compressed video data obtained by compression-encoding the third picture is calculated and set in the quantization control circuit 180 of the encoder 18.

The encoder 18 is connected to the host computer 2
From 0, the (j + 1) -th picture is compression-encoded based on the _scale data amount _Tj set in the quantization control circuit 180, and compressed video data VOUT having a data size close to the target data size _{Tj + 1} is generated. And output. In the same manner, the video data compression device 1 similarly converts the k-th picture of the delayed video data S16 into a quantized value Q _k (k = j + 2,
j + 3,...) are changed for each picture, and are sequentially compression-encoded and output as compressed video data VOUT.

As described above, according to the video data compression apparatus 1 shown in the first embodiment, the degree of difficulty of the pattern of the uncompressed video data VIN is calculated in a short time, and the compression ratio according to the calculated degree of difficulty is calculated. Thus, the non-compressed video data VIN can be adaptively compression-encoded. That is, according to the video data compression apparatus 1 shown in the first embodiment, unlike the two-pass encoding method, the non-compressed video data VI
N based on the degree of difficulty of the picture
IN can be compression-encoded, and can be applied to applications requiring real-time performance such as live broadcasting. In addition to the data multiplexing apparatus 1 according to the present invention, the data multiplexing apparatus 1 according to the present invention uses the data amount of the compressed video data compressed and encoded by the encoder 162 as difficulty data as it is, Various configurations can be adopted, such as simplification.

Second Embodiment Hereinafter, as a second embodiment of the present invention, a plurality of uncompressed video data (hereinafter, also referred to as “scene”) will be connected to one Simplified two-pass encoding in which non-compressed video data (edited video data) is used and the edited video data composed of a plurality of scenes is compression-coded using the video data compression device 1 (FIG. 1) shown in the first embodiment. The method (hereinafter, also referred to as “improved simplified two-pass encoding method”) will be described. For example, the edited video data including a plurality of scenes continuously is divided into picture type sequences I, B, B, P, B, B, P, B, B, P,
When compression encoding is performed using B, B, P, B, B, P, B, and B,
The picture of the first scene after compression encoding may be a P picture. In order to decompress and decode the P picture of the first scene, it is necessary to refer to the immediately preceding picture. However, since it is compressed video data generated from another scene, However, if a picture generated from another scene having no correlation is used, the image obtained as a result of the decompression decoding is deteriorated.

To solve such a problem, for example,
Uncompressed edited video data that includes the first scene and the second scene continuously in this order is applied without changing the image processing method and the image processing apparatus shown in the related art, and the simplified 2 When compression encoding is performed by the path encoding method, the picture type sequence P ₁ , B ₁ , B ₁ ,
P ′ ₁ , B ₁ , B ₁ , P ₁ , B ₁ , B ₁ , P ₁ , B ₁ ,
The first compressed video data (I ₁ , B ₁ , P ₁ ) and the second compressed video data (I ₂ , B ₂ , P ₂ ) of B ₁ , I ′ ₂ , B ₂ , B ₂ , I ₂ are Obtainable. Note that P ′ ₁ and I ′ ₂ in the picture type sequence indicate a P picture and an I picture that have been changed from the original I picture and the P picture, respectively.

However, in the simple two-pass encoding method, as described above, the host computer 20 calculates actual difficulty data for each type of picture, and calculates the target data amount _Tj . Thus, a picture P of the first compressed video data 'in _one, the other I target amount of data T _j calculated based on the data amount of picture is assigned, also, a picture I of the second compressed video data' the _2, so that the target amount of data T _j calculated based on the amount of data of the other P-picture will be allocated.

Here, usually, the data amount of the I picture is larger than the data amount of the P picture, and the host computer 20 generates the target data amount _Tj as described above, and the encoder 18 converts the target data amount _Tj . When performing compression coding using, the quality of the image obtained by expanding and decoding the picture I _'2 is reduced. Further, the host computer 20 inappropriately allocates a large amount of data to the picture P ′ ₁ , and the image after decompression decoding is deteriorated as a whole. As described above, the simple two-pass encoding method cannot be applied without changing the image processing method and the image processing apparatus shown as the conventional technique.
The improved simple two-pass encoding method shown in the second embodiment is made to solve the inconvenience that occurs when such edited video data is compression-encoded.

FIGS. 6A to 6C are diagrams showing a process of changing the order of pictures of the non-compressed video data performed by the encoder control unit 12 shown in FIG. 1. FIG. (B) shows a picture type sequence whose order has been changed by the encoder control unit 12;
(C) shows the compressed video data VOUT output as a result of the encoder 18 compressing and encoding the delayed video data S16.
3 shows a picture type sequence of FIG. FIG.
"Scene Change" in (A)-(C)
Is a boundary (in the time direction) between the first scene and the first compressed video data (previous scene) included in the edited video data and the second scene and the second compressed video data (back scene). Scene change).

In the encoder control unit 12 of the video data compression apparatus 1, for example, as shown in FIG. 6A, 15 pictures (N = 15, M = 3, where N is the number of pictures constituting one GOP (interval between I pictures), and M is the edited video data VIN that is compression-encoded in GOP units composed of P pictures. FIG.
(A) and (B) show the picture type of the picture of the edited video data after compression encoding.

The picture rearranging circuit 120 (FIG. 2) of the encoder control unit 12 changes the picture order of the uncompressed video data input in the picture type sequence shown in FIG. As shown, the order suitable for compression encoding in the encoder 162 and the encoder 18, that is, the order in which the B picture comes after the immediately following I picture or P picture is replaced by the encoder 162 and the FIFO as video data S 12.
Output to the memory 160.

More specifically, as shown in FIG. 6A, a scene change between the data of the first scene and the data of the second scene is compression-coded into a B picture as shown in FIG. The picture to be compression-encoded into this B picture, even if it occurs in the
Rearranged after the picture, encoder 162,
As for the encoding order of 18, the first picture type of the succeeding scene is always a picture that is compression-encoded into a P picture or an I picture. Motion detector 1
4 calculates the motion vector and the inter-frame residual shown in Equation 1, and outputs the result to the encoder control unit 12, the encoders 162 and 18, and the host computer 20.

The FIFO memory 160 outputs the input video data S12 to the encoder 18 with a delay of 15 pictures, for example. The encoder 162
The video data S12 is converted to a picture type sequence I,
B, B, P, B, B, P, B, B, P, B, B, P,
B, B, P, B, and compression-encoded by B, and the data amount of the compressed video data output to the host computer 20, the host computer 20 calculates the real difficulty data D _j of these pictures. At this time, if there is a scene change, the encoder control unit 12
The video data S12 is rearranged as shown in FIG. Therefore, the encoder 162 performs encoding on the already rearranged video data S12.

The host computer 20 has the motion detector 1
The change with time of the value of the inter-frame residual input from No. 4 is monitored. The picture pattern changes greatly before and after the scene change. Accordingly, the value of the inter-frame residual calculated from the video data of the two pictures sandwiching the scene change increases in an impulse manner as compared with the value of the inter-frame residual generated between the pictures of the other parts. . Therefore, the host computer 20 determines that the value of the inter-frame residual is 1.5 times smaller than the value of the immediately preceding inter-frame residual, for example.
It can be determined that a scene change has occurred in a portion indicating a value of twice (preferably a value between 1.4 and 1.8 times) or more.

When a scene change is detected, the host computer 20 further controls the picture type control unit 128 of the encoder control unit 12 for the portion of the edited video data before and after the scene change, and as shown in FIG. As shown, the picture type sequence of the encoder 18 is changed such that the first P picture of the subsequent scene is changed to an I picture that does not refer to the last picture of the previous scene. Further, the host computer 20
The encoder 18 changes the first I picture of the subsequent scene to a P picture so that two I pictures are included in one GOP and the quality of the video of the GOP is not degraded. Change the picture type sequence. FIG. 6C shows each picture of the compressed video data in the display order. As described above, in FIG. 6C, the display order is considered.
This is because the pictures are not rearranged at the time when the inter-frame residual is calculated by the encoder control unit 12.

[0062] Thus, a picture type sequence by changing before calculating the real difficulty data D _j, the the real difficulty data D _j calculated at the actual picture type at the time of compression encoding same Therefore, the data amount can be accurately assigned to each of the pictures after the compression and encoding.

In the scene change portion, as shown in FIG. 7, a method in which the picture type control section 128 controls the encoder 18 so that the last I picture of the previous scene is changed to the P picture can be considered. . However, the realization of this method requires the actual difficulty data D _j
For the last I-picture of the scene before the calculation of is completed, it changes the picture type retroactively is required, between the detection processing and the calculation processing of the real difficulty data D _j of the scene change, It is necessary to take measures such as adding a further delay to the video data. Therefore, rather than the method described here, as described above, the first P picture of the subsequent scene is changed to an I picture, and the first I picture of the subsequent scene is changed to an I picture.
It is more advantageous to adopt a picture type changing method of changing a picture to a P picture.

As in the first embodiment, the encoder 18 has a target data amount T _j set by the host computer 20 and a picture type sequence (FIG. 7) set by the picture type control unit 128 of the encoder control unit 12. 6 (C)), the video data S16 is compression-encoded and output as compressed video data VOUT.

The operation of the video data compression device 2 will be further described below with reference to FIG. FIG. 8 is a flowchart showing the processing content of the video data compression device 1 according to the second embodiment. As shown in FIG.
In (S100), the host computer 20 sets the immediately preceding value (Δ _prev ) of the inter-frame residual to the maximum value (∞). In step 102 (S102), the host computer 20 determines whether or not there is a j-th picture to be processed. If there is a j-th picture, the process proceeds to S104. Ends the processing.

In step 104 (S104), the motion detector 14 sets the (j-1) -th picture and the j-th picture.
Calculate the inter-frame residual between the pictures. In step 106 (S106), the compression encoding unit 10
6 divides the value of the inter-frame residual (Δ) calculated by the motion detector 14 in the processing of S104 by the immediately preceding value (Δ _prev ) of the inter-frame residual, and the division result is a predetermined threshold (Th,
In the second embodiment, it is determined whether the value is greater than 1.5). If it is larger, the process proceeds to S108, and if it is not larger, the process proceeds to S116.

In step 108 (S108), the host computer 20 determines whether or not the j-th picture is a P-picture. If the j-th picture is a P-picture, the process proceeds to S110. ,
If it is not a P picture, the process proceeds to S112. In step 110 (S110), the host computer 20 determines that a scene change has occurred between the (j-1) th picture and the jth picture, and changes the jth picture to an I picture. Then, the frame type sequence is controlled so that the first I picture of the subsequent scene is changed to the P picture, and the target data amount _Tj is calculated.

In step 112 (S112), the host computer 20 determines whether or not the j-th picture is a B picture. If the j-th picture is a B picture, the host computer 20 proceeds to S114. ,
If it is not a B picture, the process proceeds to S116. In step 114 (S114), the host computer 20 determines that a scene change has occurred between the (j-1) th picture and the jth picture, and changes the next P picture to an I picture. And the next I
The frame type sequence is controlled so as to change the picture to the P picture, and the target data amount T _j
Is calculated. In step 116 (S116), the host computer 20 determines the immediately preceding value (Δ
_prev ) is updated to the value of the inter-frame residual (Δ) between the (j−1) th picture and the jth picture.

As described above, the improved simplified 2 shown in the second embodiment
According to the path encoding method, video data including scene changes and camera flashes can be compression-encoded at a high compression rate, and the encoding distortion occurring before and after scene changes and camera flashes is significantly reduced. Can be. Therefore, it is possible to improve the quality of the video obtained by decompressing and decoding the compressed video data generated by the improved simplified two-pass encoding method shown in the second embodiment.

In the second embodiment described above, the occurrence of a scene change is detected based on the change over time of the value of the inter-frame difference. For example, it is defined by the following equation (5). The processing content of the host computer 20 may be changed so that the detection is performed based on the prediction error value (ME residual).

[0071]

(Equation 5)

As shown in Expression 5, the ME residual (E) is obtained by calculating the absolute value of the difference between the luminance signal (Y _i ) for each macroblock serving as a unit of the compression encoding process and the motion vector (R _j ). (May be the squared difference)) is the sum of absolute values of all macroblocks included in one frame. As described above, since the picture of the picture greatly changes before and after the scene change, the value of the ME residual in the scene change part increases like an impulse, as in the case of the inter-frame residual. The host computer 20 monitors the change over time of the value of the inter-frame residual input from the motion detector 14 so that the value of the ME residual becomes
For example, a scene change can be detected in a portion indicating a value that is 1.5 times or more the value of the E residual.

[0073] Also, the host computer 20, based on the compression encoding result of the encoder 162, in addition to the real difficulty data D _j, other data, for example, further improve the quality of the image of the compressed video data in the encoder 18 To generate additional data to be used for
The operation of the video data compression device 1 according to the second embodiment may be modified so that the encoder 18 performs compression encoding based on this additional information. Further, it is needless to say that the improved simplified two-pass encoding method shown in the second embodiment can be applied to the case where the video data compression apparatus 1 performs compression encoding with another picture type sequence.

Third Embodiment Hereinafter, a third embodiment of the present invention will be described. According to the simplified two-pass encoding method shown in the first embodiment and the improved simplified two-pass encoding method shown in the second embodiment and having two encoders and one FIFO circuit (n = 2), The compression encoding of the non-compressed video data can be performed in real time without deteriorating the quality of the video data.
On the other hand, there is a demand for further improving the quality of a video or adding a special effect according to the content of the generated compressed video data. The video data compression device 2 described in the third embodiment has been made to meet such a request.

FIG. 9 is a diagram showing the configuration of the video data compression device 2 according to the third embodiment of the present invention. Note that among the components of the video data compression device 2 shown in FIG. 9, the same components as those of the video data compression device 1 (FIGS. 1 to 4) are denoted by the same reference numerals. As shown in FIG. 9, the video data compression device 2 has a configuration in which the compression encoding unit 10 of the video data compression device 1 is replaced with a compression encoding unit 22. The compression encoding unit 22 includes delay / compression encoding units 24a and 24b corresponding to the delay / compression encoding unit 16 of the video data compression device 1, respectively.
The compression encoders 24a and 24b are provided with FIFO memories 160 and FIs corresponding to the encoders 18 and 162, respectively.
FO memories 160a and 160b and encoder 18
a, 162b. That is, the video data compression device 2 has a configuration in which the delay / compression encoding unit 16 of the video data compression device 1 is added to two delay / compression encoding units 24a and 24b (n = 3).

Hereinafter, the operation of the video data compression device 2 will be described. Encoder control unit 12 of video data compression device 2
As in the second embodiment, FIG.
As shown in (B), the video data S12 is generated by performing processing such as changing the picture order of the uncompressed video data to an order suitable for compression encoding, and the encoder 162a of the delay / compression encoding unit 24b. And FIFO memory 1
Output to 60a. The motion detector 14 calculates a motion vector and an inter-frame residual as in the second embodiment, and outputs the calculated motion vector and the inter-frame residual to the encoder control unit 12, the encoders 162b and 18a, and the host computer 20.

In the delay / compression encoding unit 24b, the FI
As in the second embodiment, the FO memory 160b delays the video data S12 and outputs the video data S12 to the encoder 18a and the encoder 162a of the delay / compression encoder 24a. The encoder 162b converts the video data S12 into the picture type sequence I, B, B, P, B, B, P, B, B, as in the second embodiment.
P, B, B, P, B, B, P, B, B
The amount of compressed video data and the like are stored in the host computer 20.
Output to

[0078] The host computer 20, as well as in the second embodiment, based on the data amount of the compressed video data input from the encoder 162b, calculates the actual difficulty data D _j of these pictures, a scene change when detecting, performs processing for changing the picture type sequence in the encoder 18a of the delay-compression encoding unit 24a, further, calculates a target amount of data T _j to be allocated to these pictures.

In the delay / compression encoder 24a, the FI
The FO memory 160a further delays the video data S24b input from the FIFO memory 160b, and outputs the video data S24b to the encoder 18 as video data S24a.
The encoder 18a is set by the target data amount T _j set by the host computer 20 and the picture type control unit 128 of the encoder control unit 12, similarly to the encoders 162 and 18 of the video data compression device 1 (FIG. 1). Based on the picture type sequence (FIG. 6C), the video data S16 is compression-encoded to generate compressed video data, and the value such as the data amount of the compressed video data is output to the host computer 20.

The host computer 20 has the encoder 1
Similarly to the control for the encoder 18, the control of the picture type sequence and the target data amount T
_Perform processing such as setting of _j . Further, the host computer 20 adaptively, for example, based on the data amount of the compressed video data input from the encoder 162a, for example,
It generates additional data used to improve the quality of the compressed video data or additional data used to add a special effect such as emphasizing a characteristic portion of the compressed video data, and Output. The encoder 18 compression-encodes the video data S24a input from the delay / compression encoding unit 24a based on the additional data input from the host computer 20.

As described above, the video data compression device 2
By performing the same processing as the improved simplified two-pass encoding method shown in the second embodiment.
Processing such as adaptively adding a special effect corresponding to the content of the compressed video data can be performed. Note that in the second embodiment, the video data compression device 1
8 and one delay / compression coding unit (n = 2)
In the third embodiment, the case where the video data compression apparatus 2 has two delay / compression encoding units (n = 3) in addition to the encoder 18 has been described. The video data compression device 2 may be configured by further increasing the number of delay / compression encoding units according to the content, number, or type (n = 4, 5,...).

[0082]

As described above, according to the video data compression apparatus and method according to the present invention, video data continuously including a plurality of scenes can be reduced to a predetermined data amount or less without using two-pass encoding. It is possible to generate compressed video data by compression encoding, and furthermore, to obtain a video obtained as a result of decompression decoding of compressed video data obtained by compressing and encoding boundaries (scene changes) in the time direction of a plurality of continuous scenes. Quality can be maintained.

Further, according to the video data compression apparatus and method of the present invention, video data including scene changes and camera flashes can be compression-coded at a high compression rate, and in addition to scene changes and camera flashes. The encoding distortion that occurs before and after can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a video data compression device according to the present invention.

FIG. 2 is a diagram illustrating a configuration of an encoder control unit illustrated in FIG. 1;

FIG. 3 is a diagram illustrating a configuration of an encoder of a delay / compression encoding unit illustrated in FIG. 1;

FIG. 4 is a diagram illustrating a configuration of an encoder illustrated in FIG. 1;

FIGS. 5A to 5C are diagrams illustrating an operation of a simple two-pass encoding of the video data compression device according to the first embodiment.

FIGS. 6A to 6C are diagrams showing a process of changing the order of pictures of non-compressed video data performed by the encoder control unit shown in FIG. 1; FIG.
Shows a real-time picture type sequence of IN,
(B) shows a picture type sequence in which the order is changed by the encoder control unit 12, and (C) shows a picture type sequence of the compressed video data VOUT output as a result of the encoder 18 compressing and encoding the delayed video data S16. .

FIG. 7 is a diagram illustrating a method in which a picture type control unit 128 (FIG. 2) changes a last I picture of a previous scene to a P picture in a scene change portion.

FIG. 8 is a flowchart showing processing contents of a video data compression device (FIG. 1) in a second embodiment.

FIG. 9 is a diagram illustrating a configuration of a video data compression device according to the present invention in a third embodiment.

[Explanation of symbols]

1 video data compression device, 10, 22 compression encoding unit,
12: encoder control unit, 120: picture rearrangement circuit, 122: scan conversion block circuit, 124: frame memory circuit, 126: addition circuit, 128: picture type control unit, 14: motion detector, 16, 24a, 2
4b: delay / compression encoding unit, 160: FIFO memory,
162, 18 ... encoder, 164 ... addition circuit, 166
.. DCT circuit, 168 quantization circuit, 170 variable length coding circuit, 172 inverse quantization circuit 172, 174 inverse D
CT circuit, 176 ... addition circuit, 178 ... motion compensation circuit,
180: motion compensation circuit, 20: host computer

Claims (8)

[Claims] 1. A sequentially uncompressed video data, each by a predetermined delay time T _k (n-1) to delay stage (n-1)
And delay means (where n and k are integers, 2 ≦ n, 1 ≦ k
≦ n), the uncompressed video data, or the (n−
1) Each of the delay units sequentially compresses the uncompressed video data delayed by a predetermined compression encoding method to generate compressed video data, and n first and second compression encoding units; additional data generation means for generating predetermined additional data from the compressed video data generated by the (n-1) th compression encoding means, wherein the k-th compression encoding means comprises: However, based on the additional data generated from the compressed video data generated by the (k-1) th compression encoding means, the first to (k-1) th delay means sequentially perform A video data compression device for compressing and encoding the delayed uncompressed video data. 2. The image processing apparatus according to claim 1, further comprising 1 (n = 2) delay means and two compression encoding means, wherein the first picture after compression encoding of each of a plurality of continuous uncompressed video data is P Order changing means for changing the order of pictures of the plurality of uncompressed video data so as to become a picture or an I picture; and a difference value or prediction error between frames of the plurality of uncompressed video data having changed the order of pictures. Further comprising a difference value / prediction error calculating means for calculating a value, wherein the first one of the two compression coding means is a plurality of the non-compressed video data in which a picture order is changed. Is compression-encoded by a predetermined compression-encoding method having a certain picture type sequence to generate first compressed video data including a plurality of types of pictures, The stage delays the uncompressed video data by a time during which the uncompressed video data is input by a predetermined number of pictures, and the additional data generation unit calculates the calculated difference value or the prediction error value, and Data of compressed video data after compression encoding of the plurality of non-compressed video data based on the data amount of the first compressed video data generated while a predetermined number of pictures of uncompressed video data are input Target value data indicating a target value of the amount is generated for each picture as the additional data so as to have a correlation only with the data amount of the picture of the compressed video data obtained by compression-coding the same uncompressed video data. Out of the compression encoding means, the second compression encoding means converts the plurality of delayed uncompressed video data into the first
2. The video data according to claim 1, wherein the compression encoding is performed by a compression encoding method corresponding to the compression encoding method of the compression encoding means, and second compressed video data corresponding to each of the plurality of uncompressed video data is generated. Compression device. 3. The first compression-encoding means compresses and encodes the plurality of uncompressed video data in which the order of pictures is changed, and the first compression-encoding means includes at least an I picture and a P picture. The additional data generation means, based on the calculated difference value or the change in the prediction error value, detects a boundary in the time direction of the plurality of uncompressed video data, the boundary detection means, The first compressed video data generated from the same non-compressed video data includes target value data indicating a target value of the data amount of the compressed video data after compression-encoding the picture at the boundary in the time direction of the non-compressed video data. And a target value data calculating means for calculating based on a data amount of a picture included in the plurality of compressed non-compressed video data. 3. The video data compression apparatus according to claim 2, wherein each of the first pictures is compression-encoded into an I picture to generate the second compressed video data. 4. The second compression-encoding means changes the last I picture of the second compressed video data corresponding to each of the plurality of uncompressed video data into a P-picture, and compression-encodes the picture. 4. The video data compression device according to claim 3, wherein the video data compression device generates the second compressed video data. 5. Sequential uncompressed video data sequentially by a predetermined delay time T _k, and delayed (n-1) stages (where, n, k
Is an integer, 2 ≦ n, 1 ≦ k ≦ n). Each of the uncompressed video data or the uncompressed video data delayed in k stages is compression-coded by a predetermined compression coding method, and n A video data compression method for generating compressed video data and generating predetermined additional data from the compressed video data generated from each of the non-compressed video data delayed from the first stage to the (n-1) th stage, A video data compression method, wherein the compression encoding of the uncompressed video data delayed in the step is performed based on the additional data generated from the uncompressed video data delayed in the (k-1) th step. 6. The picture sequence of the plurality of uncompressed video data is changed so that the first picture after compression coding of each of the plurality of continuous non-compressed video data is a P picture or an I picture. Calculating a difference value or a prediction error value between frames of the plurality of uncompressed video data in which the order of pictures has been changed, and converting the plurality of uncompressed video data in which the order of pictures has been changed into a predetermined picture type sequence To generate first compressed video data including a plurality of types of pictures, and a plurality of uncompressed video data is input by a predetermined number of pictures in one step (n). = 1), the plurality of uncompressed video data in which the order of pictures has been changed is delayed, and the calculated difference value or the prediction error is calculated. After compressing and encoding the plurality of uncompressed video data based on the value and the data amount of the first compressed video data generated while a predetermined number of pictures of the uncompressed video data are input. The target value data indicating the target value of the data amount of the compressed video data is used as the additional data, so that it has a correlation with only the data amount of the picture of the compressed video data obtained by compression-coding the same non-compressed video data. The generated and delayed plurality of uncompressed video data are compression-encoded by a compression encoding method corresponding to the predetermined compression encoding method, and second compressed video data corresponding to each of the plurality of uncompressed video data 6. The video data compression method according to claim 5, wherein 7. A method for compressing and encoding the plurality of uncompressed video data in which the order of pictures has been changed to generate the first compressed video data including at least an I picture and a P picture; Based on a change in the prediction error value, detecting a temporal boundary of the plurality of uncompressed video data, and compressing and encoding a picture of a temporal boundary of the plurality of uncompressed video data, Calculating target value data indicating a target value of the data amount of the plurality of delayed uncompressed video images based on the data amount of pictures included in the first compressed video data generated from the same uncompressed video data. 7. The video data compression method according to claim 6, wherein the first picture of each data is compression-encoded into an I picture to generate the second compressed video data. 8. The second compressed video data is generated by changing the last I picture of the second compressed video data corresponding to each of the plurality of uncompressed video data to a P picture and compression encoding the same. Item 8. The video data compression method according to Item 7.