KR101647072B1 - Apparatus for Encoding, Driving Method and Encoding Method Thereof - Google Patents

Apparatus for Encoding, Driving Method and Encoding Method Thereof Download PDF

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KR101647072B1
KR101647072B1 KR1020100017456A KR20100017456A KR101647072B1 KR 101647072 B1 KR101647072 B1 KR 101647072B1 KR 1020100017456 A KR1020100017456 A KR 1020100017456A KR 20100017456 A KR20100017456 A KR 20100017456A KR 101647072 B1 KR101647072 B1 KR 101647072B1
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information
bit rate
encoding
input image
image
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KR1020100017456A
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Korean (ko)
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KR20110098037A (en
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임정연
김수년
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에스케이텔레콤 주식회사
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Priority to PCT/KR2011/001379 priority patent/WO2011105867A2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/15—Data rate or code amount at the encoder output by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer

Abstract

An embodiment of the present invention relates to an encoding apparatus, a driving method thereof, and a coding method. An encoding apparatus according to an embodiment of the present invention includes an image analyzer for receiving and analyzing an input image and outputting the input image and analysis information; An input image and analysis information buffer for storing the input image and the analysis information and providing the stored input image and the analysis information in different paths; A database unit receiving the information related to the output amount of the output bitstream and / or the analysis information, and selecting and providing encoding related prediction information according to the output amount related information of the bitstream and the analysis information; A bit rate controller for generating bit rate allocation information for allocating a bit rate of the input image using the analysis information, the encoding related prediction information, and the output status information of the output bitstream; And an encoding unit for encoding the input image using the encoding related prediction information, the bit rate allocation information, and the output state information of the bitstream, and outputting the encoded information, ; And an output state information buffer for receiving and storing the output state information of the bitstream and providing the output state information to the bitrate controller and / or the encoding unit.

Figure R1020100017456

Description

Technical Field [0001] The present invention relates to an encoding apparatus, a driving method thereof,

An embodiment of the present invention relates to an encoding apparatus, a driving method thereof, and a coding method. More specifically, it can efficiently use the bit rate by using the image analysis technique and the adaptive control method of the bit rate for a specific interval within a given buffering time, and it is possible to maintain the stable and optimal image quality, The present invention relates to a coding apparatus, a driving method, and a coding method of the coding apparatus.

Digital television is becoming more and more popular because of the integration of various functions together with the realization of high quality. These various functions include information and entertainment such as pay-per-view, electronic program guide, VOD, weather and stock information, and Internet hyperlinks. do.

In digital television, data is communicated to a user via a satellite or cable television network or via a computer network.

However, the television data is transmitted in the form of a compressed bit stream due to the bandwidth limitation of the communication channel, and the bit rate is adjusted while being encoded and multiplexed for transmission. The purpose of this bit rate adjustment is to overcome constraints on the overall bit rate of the multiplexed stream while maintaining a satisfactory video quality for each program.

Thus, various types of statistical multiplexers have been developed that evaluate the statistical information of the source video data to be encoded and accordingly allocate bits to encode different video channels. Such a multiplexer can allocate many bits to a video channel having a vastly changing video, such as, for example, a fast moving scene, while a few bits can be assigned to a channel having a small variation of video, such as a stationary or slow moving scene Can be assigned.

Such a multiplexing system must use a plurality of individual encoders which encode data provided on a plurality of channels on a channel-by-channel basis. Such a system dynamically allocates bits to individual encoders to encode the video data. In addition, the system must distinguish between encoding bit rate assignment and transmission bit rate assignment.

The system must assign a transmission bit rate to each video channel to prevent mismatch between the input and output bits of the decoder buffer. In addition, the system checks the overflow or underflow status of the input data to set the minimum and maximum limits on the transmission bit rate. Here, the minimum and maximum limits should be set based on whether the new transmission bit rate can be realized before the DTS (Decoding Time Stamp) of the current or next frame. The DTS indicates information on the decoding execution time.

In addition, such a system should be suitable for application to various types of video data, including high definition (HD) and standard definition (SD) televisions.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a block diagram showing a coding apparatus according to the prior art; FIG.

1, the encoding apparatus according to the related art includes buffer / request parameter calculation units 102, 104 and 106, a rate control processor 125, encoders 112, 114 and 116, a multiplexer 120 A transmission packet buffer 130, and a transmitter 135. [

Here, the buffer / request parameter calculator 102, 104, or 106 receives different uncompressed source video data and supplies the requested parameter data to the rate control processor 125. [

The rate control processor 125 alternately supplies the encoding bit rate allocation information to each of the encoders 112, 114 and 116 and receives a fullness signal from the transmission packet buffer 130.

The encoders 112, 114, and 116 perform encoding on the input source video and provide feedback information indicating the encoding bit rate to the rate control processor 125.

The multiplexer 120 receives the encoded data from the encoders 112, 114, and 116 and outputs the multiplexed bit stream.

The transmission packet buffer 130 supplies the multiplexed bit stream to the transmitter 135. The transmitter 135 transmits information on the multiplexed bit stream.

The decoding unit 180 includes a receiver 182, a decoder buffer 184, a demultiplexer 186, and a decoder 180.

According to this configuration, the decoding unit 180 reconstructs the information transmitted from the transmitter 135 to generate a decoded video signal, and the decoded video signal can be displayed on, for example, a television.

However, the conventional configuration increases the data processing speed by adjusting the bit rate for each encoder, but does not improve the image quality of the image finally displayed on a television or the like in comparison with the input image provided to the encoder.

Furthermore, it does not satisfy the desire to adaptively select and adjust the output image according to the demands of viewers who prefer different colors, for example, when watching TV.

The embodiment of the present invention applies a bit rate control method and an adaptive database utilization method to a coding apparatus in an image analysis technique, a buffering time interval, and the like, so that a more efficient use of a bit rate and stable and optimal objective and subjective image quality The present invention provides a coding apparatus, a method of driving the same, and a coding method that can be maintained.

An encoding apparatus according to an embodiment of the present invention includes an image analyzer for receiving and analyzing an input image and outputting the input image and analysis information; An input image and analysis information buffer for storing the input image and the analysis information and providing the stored input image and the analysis information in different paths; A database unit receiving the information related to the output amount of the output bitstream and / or the analysis information, and selecting and providing encoding related prediction information according to the output amount related information of the bitstream and the analysis information; A bit rate controller for generating bit rate allocation information for allocating a bit rate of the input image using the analysis information, the encoding related prediction information, and the output status information of the output bitstream; And an encoding unit for encoding the input image using the encoding related prediction information, the bit rate allocation information, and the output state information of the bitstream, and outputting the encoded information, ; And an output state information buffer for receiving and storing the output state information of the bitstream and providing the output state information to the bitrate controller and / or the encoding unit.

According to another aspect of the present invention, there is provided a method of driving an encoding apparatus, the method including receiving and analyzing an input image and outputting the input image and analysis information; Storing the input image and the analysis information, and providing the stored input image and the analysis information in different paths; Receiving information related to the amount of output of the output bitstream and / or the analysis information, and selecting and providing information related to the amount of output of the bitstream and encoding-related prediction information according to the analysis information; Generating bit rate allocation information for allocating a bit rate of the input image using the analysis information, the encoding related prediction information, and the output state information of the output bitstream; Providing the output amount related information and the output state information, encoding the input image using the encoding related prediction information, the bit rate allocation information, and the output state information, and outputting the encoded bit stream; Receiving the output state information and storing the output state information, and providing the output state information when generating the bit rate allocation information and encoding the input image.

According to another aspect of the present invention, there is provided a coding method of an encoding apparatus, including: receiving an image; Receiving bit rate allocation information generated using analysis information on the image and encoding-related prediction information associated with the analysis information; Receiving the encoding related prediction information; Encoding the image using the bit rate allocation information and the encoding related prediction information; Receiving corrected bit rate allocation information generated using bitstream information of an encoded image and the encoding related prediction information associated with information related to an output bit amount of the bitstream; Receiving the bitstream information; And encoding the image using the corrected bit rate allocation information and the bitstream information.

According to an embodiment of the present invention, a plurality of encoders can guarantee a target image quality on the basis of image analysis and adaptive database prediction information for each input image, and calculate a future bit rate usage for an entire encoding target video sequence in a buffering time interval And allocates each bit rate for the current frames to be coded based on the prediction, and each encoder performs coding so that each encoder maintains subjective and objective image quality compared with the case where each encoder operates independently while controlling the bit rate. ~ 40% bit rate reduction effect can be obtained.

In addition, in the method of using the image analysis information, the bit rate correction method using the feedback information in the encoder, and the encoding method using the database information, the subjective bit rate reduction effect and the subjective image quality can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional encoding apparatus,
2 is a block diagram illustrating a structure of a coding apparatus according to an embodiment of the present invention,
3 is a diagram showing the data structure of the analysis information of FIG. 2,
4 is a diagram illustrating a data structure of input image and analysis information stored in the input image and analysis information buffer unit of FIG. 2,
5 is a flowchart showing an operation procedure of the encoding apparatus shown in FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals as possible, as they can be displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

2 is a block diagram illustrating a structure of an encoding apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a data structure of the analysis information of FIG. 2. FIG. And the data structure of the stored input image and analysis information.

2 to 4, an encoding apparatus according to an embodiment of the present invention includes an image analysis unit 210 for analyzing an input image and outputting analysis information and an input image, An input image and analysis information buffer 220 for providing analysis information and an input image in different paths, an output buffer 220 for outputting information related to output amount and / or analysis information of an output bitstream, A database unit 230 for selecting and providing encoding related prediction information, a bit rate controller for generating bit rate allocation information for allocating a bit rate of an input image using the provided analysis information, encoding related prediction information, and output state information of the bitstream 240, output-related information of the bitstream, and output status information of the bitstream, and outputs encoding-related prediction information, An encoding unit 250 for encoding the input image using the allocation information and the output state information of the bitstream, and outputting the encoded bitstream; and an encoding unit 250 for receiving and storing the output state information of the bitstream and outputting the output state information to the bitrate controller 240 And an output state information buffer 260 for providing the output state information to the encoding unit 250.

The image input unit 200 is connected to the interface system and the image analysis unit 210. The image input unit 200 receives the image from the interface system and provides the received image to the image analysis unit 210 again. The video input unit 200 may include first to Nth video input units 200_1, 200_2, ..., and 200_N. The N video encoders of the encoder 250 use the same fixed band, So that it is possible to divide and optimally use the respective bands.

The image analysis unit 210 is connected to the image input unit 200 and the input image and analysis information buffer unit 220 and is connected to the first to Nth image input units 200_1, 200_2, ..., 1 to Nth image analysis units 210_1, 210_2, ..., 210_N. The image analysis unit 210 performs image analysis on each input image, and provides analysis information on the image to the input image and analysis information buffer unit 220 together with the image. For example, the Nth analysis information is extracted from the Nth image input to the Nth image analyzer 210_N, and the Nth analysis information is provided to the Nth input image and the analysis information buffer 220_N together with the Nth image .

As shown in FIG. 3, the analysis information of the image output through the image analysis unit 210 includes information on the complexity of the image, the data amount of the difference image indicating the difference between the current image and the previous image, (Inter) / Intra coding cost prediction information, area detection information, border detection information, scene change detection information, and the like. As this image analysis information, more various information can be used as characteristic data according to the purpose of use.

The input image and analysis information buffer unit 220 is connected to the image analysis unit 210, the database unit 230, the bitrate controller 240, and the encoding unit 250 as a kind of memory. The input image and analysis information buffer unit 220 analyzes the analysis information of each image provided from the first to Nth image analysis units 210_1, 210_2, ..., and 210_N with first to Nth input images and analysis And temporarily stores the information temporarily in the information buffers 220_1, 220_2, ..., 210_N. Thereafter, the analysis information is sequentially provided to the database unit 230 and the bitrate controller 240, respectively, and the images are sequentially provided to the encoding unit 250. For example, as shown in FIG. 4, the input image and analysis information buffer 220 may include first through N-th analysis information and images provided from the image analysis unit 210, And provides the analysis information to the database unit 230 and the bit rate controller 240, respectively, and provides the image to the encoding unit 250. [0051]

The database unit 230 is divided into an adaptive information database 231 and an initialization information unit 233 and is connected to the input image and analysis information buffer unit 220, the bit rate controller 240, and the encoding unit 250, respectively. Also, the database unit 230 includes first through Nth adaptive information databases 231_1, 231_2, ..., and 231_N for constructing a plurality of encoders. The respective adaptive information databases 231_1, 231_2, ..., and 231_N are connected to the first to Nth initialization information units 233_1, 233_2, ..., and 233_N, respectively. The adaptive information database 231 stores an encoding parameter prediction including a quantization factor value for each encoding block, a weight for each region property, a coding mode prediction value and the like, an output bit rate prediction value when using the predicted encoding parameter, do.

Accordingly, the database unit 230 provides the encoding-related prediction information selected according to the analysis information received from the input image and analysis information buffer unit 220 to the bit rate controller 240 and the encoding unit 250, The control unit 250 receives the output bit amount and other information as the encoding result again and performs adaptive correction on the information to be predicted in the future. Here, the adaptive correction refers to correcting the encoding-related prediction information so that an optimal image quality can be maintained with respect to an encoded image. The first to Nth initialization information units 233_1, 233_2, ..., and 233_N include analysis information and / or initialization information for the video input image, that is, first through Nth adaptive information databases 231_1, 231_2, ) Is initialized and corrected.

As a result, the database unit 230 enables the bit rate controller 240 and the encoding unit 250 to optimally select the adaptive information according to the analysis information and classification characteristics of the image, thereby maintaining the optimal image quality for the image information .

The bit rate controller 240 is connected to the input image and analysis information buffer unit 220, the database unit 230, the encoding unit 250, and the output state information buffer 260, respectively. The bit rate controller 240 receives the image analysis information and / or buffering time related information from the input image and analysis information buffer unit 220, the encoding related prediction information from the database unit 230, and the bit that the entire images in a given buffering time can have And supplies the bit rate allocation information for allocating the bit rate of each current input image to the encoding unit 250 using the received bit rate information.

At this time, the bit rate allocation for the current frame is performed together with the bit rate control for the video sequence of the entire specific time interval being buffered. In particular, the bit rate allocation for the current frame is performed by using the image analysis information for the input video sequence of each encoder over the entire buffered specific time interval So that the bit rate distribution for the current input video frame is first performed based on the bit rate usage information for a specific time interval corresponding to the buffering time, It is possible to distribute the bit rate considering the characteristics on the time axis of the input image, that is, the input image in frame units. For example, if it is predicted that the bit rate usage in a specific time interval corresponding to the buffering time will exceed the target bit rate, the current bit rate allocation is minimized in a range where the reference quality can be maintained, The bit rate allocation can be controlled so as to improve the image quality.

The bit rate controller 240 receives the bit stream information for the encoded stream output from the encoder 250, that is, the updated output bit rate status information from the output status information buffer 260, For example, the bit rate controller 240 determines whether the bit generation amount of all the encoders up to now exceeds the target bit rate, uses less, outputs the over and under information The bit rate allocation information may be provided to the encoding unit 250 by adaptively correcting the initially allocated bit rate allocation information based on the image analysis information and the buffering time information by using the bit rate information for correction of the bit rate allocation information.

The encoding unit 250 includes first to Nth encoders 250_1, 250_2, ..., and 250_N for forming a plurality of encoders and includes an input image and analysis information buffer unit 220, a database unit 230, Controller 240 and output state information buffer 260, respectively. The encoding unit 250 encodes the input information and the input information provided from the analysis information buffer unit 220 based on the encoding related prediction information received from the database unit 230 and the bit rate allocation information received from the bit rate controller 240. [ And performs encoding of the image to output an encoded stream.

At the same time, the encoding unit 250 generates or extracts bitstream information from the encoded stream and provides it to the database unit 230 and / or the output state information buffer 260. For example, the encoding unit 250 feeds back the output bit amount and other information, which are encoding results, to the database unit 230 to perform adaptive correction on future information to be predicted.

The encoding unit 250 receives the bit rate allocation information adaptively corrected based on the output state information provided by the output state information buffer 260 from the bit rate controller 240 and outputs it to the encoders 250_1, 250_2, ..., 233_N And corrects the allocated bit amount by using the output state information fed back from the output state information buffer 260. In this case, So that an optimum image quality can be maintained.

The output state information buffer 260 is connected to the bit rate controller 240 and the encoding unit 250. The output state information buffer 260 receives the bitstream information for the encoded stream from the encoding unit 250 and updates the bitstream information, And provides the updated information to the bit rate controller 240 and the encoding unit 250 again.

5 is a flowchart showing an operation procedure of the encoding apparatus shown in FIG.

Referring to FIG. 5 together with FIG. 2, the image input unit 200 receives an input image from the outside and transmits the input image to the image analysis unit 210.

The image analysis unit 210 extracts analysis information on the received image and outputs the analysis information and the image together (S501). The analysis information includes inter / intra coding prediction information, area detection information, boundary detection information, scene change detection information, and the like, which are calculated based on the complexity of the image and the data amount of the difference image, as described above.

The analysis information and images output from the image analysis unit 210 are provided to the input image and analysis information buffer unit 220 and are sequentially stored. The analysis information stored in the input image and analysis information buffer unit 220 is provided to the database unit 230 and the bitrate controller 240 and the image is provided to the encoding unit 250 in operation S502.

The database unit 230 stores encoding-related prediction information, that is, parameter information, each of which is matched with the input analysis information. The previously stored encoding related prediction information is selected and output according to the input analysis information (S503). The database unit 230 corrects the selected encoding-related prediction information according to the output bit amount related information of the output encoded stream and outputs the corrected encoding related prediction information (S503). Here, the correction of the database unit 230 converts the encoding-related prediction information selected and output according to the analysis information of the image into the encoding-related prediction information selected in accordance with the output bit-amount-related information, and outputs the encoding-related prediction information.

The bit rate controller 240 provides the bit rate allocation information to the encoding unit 250. The bit rate allocation information is determined based on the encoding-related prediction information of the database unit 230 selected according to the analysis information and analysis information of the input image and the image provided by the analysis information buffer unit 220 (S504). In addition, the bit rate controller 240 may select the output bit amount information based on the corrected encoding related prediction information provided by the database unit 230 and / or the corrected bit stream information provided from the output state information buffer 260 The bit rate allocation information is corrected and provided to the encoding unit 250 (S504). Here, the correction of the bit rate controller 240 generates the bit rate allocation information based on the analysis information of the image and the encoding-related prediction information selected in accordance with the analysis information, and then the encoding-related prediction information selected in accordance with the output bit- Based on the stream information.

The encoding unit 250 encodes the input image and the input image provided from the analysis information buffer unit 220. The encoding unit 250 encodes the input image with different bit amounts according to the bit rate allocation information provided by the bit rate controller 240, and outputs the encoded bit stream (S505). The encoding unit 250 extracts bitstream information from the output bitstream and provides the extracted bitstream information to the database unit 230 and the output state information buffer 260. The encoding unit 250 receives the corrected bit rate allocation information from the bitrate controller 240, And outputs the coded bit stream (S505).

The output state information buffer 260 stores the output state information provided by the encoder 250 and uses the stored output state information when the bit rate controller 240 generates the bit rate allocation information and the encoding unit 250 encodes the bit rate allocation information (S506).

As a result, the encoding unit 250 performs encoding based on the image analysis information, the encoding-related parameter information, and the output status information, and can output various types of target image quality by outputting the encoded bitstream, The target bit rate can be accurately maintained.

Meanwhile, in the encoding apparatus according to the embodiment of the present invention shown in FIG. 2, one of the N encoders may be a master encoder and the remaining encoder may be a slave encoder. At this time, the master encoder holds the bit rate controller and the output state information buffer, collects information necessary for the coding bit rate allocation, and can assign the bit rate to each encoder. On the other hand, the slave encoder may transmit the image analysis information, the adaptive database information, and the output status information to the master encoder to perform the role of receiving the bit rate or obtaining the correction information for the current encoding process.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

The terms "include", "comprise", or "have" in the specification do not exclude other components, unless the context clearly indicates otherwise. But should be construed to include other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The embodiments of the present invention are applicable to an encoder, a driving method thereof, and a coding method thereof. When a plurality of encoders perform encoding based on bit rate information allocated to each input image while assuring a target image quality based on image analysis and adaptive database prediction information, each of the encoders performs subjective and objective It is possible to achieve a bit rate reduction effect of about 30 to 40% while maintaining image quality. In addition, in the method of using the image analysis information, the bit rate correction method using the feedback information in the encoder, and the encoding method using the database information, the subjective bit rate reduction effect and the subjective image quality can be improved.

200: image input unit 210: image analysis unit
220: input image and analysis information buffer 230:
231: Adaptive information database 233: Initialization information section
240: bit rate controller 250:
260: output status information buffer

Claims (8)

An image analyzer for receiving and analyzing an image sequence including a plurality of input images and outputting analysis information for each input image;
A database unit for selecting encoding-related prediction information for each input image using analysis information for each input image;
A bit rate controller for generating bit rate allocation information for allocating a bit rate for each input image using the input image analysis information and the encoding related prediction information;
An encoding unit encoding the image sequence using the encoding related prediction information and the bit rate allocation information and outputting the encoded image sequence; And
And an output state information buffer for providing the bit rate controller with the output bit rate information of the bit stream output from the encoding unit
≪ / RTI &
Wherein the bit rate controller regenerates bit rate allocation information on the basis of information on an output bit rate of the video sequence output from the encoder and provides the bit rate allocation information to the encoder,
Wherein the encoding unit encodes the video sequence using the regenerated bit rate allocation information, and outputs the encoded video sequence. The method according to claim 1,
Wherein the database unit comprises an initialization information unit for initializing analysis information for each input image and the encoding-related prediction information, and for enabling input of new information. The method according to claim 1,
The analysis information for each input image may include information on the complexity of the input image, inter or intra prediction cost information calculated based on a data amount of a difference image indicating a difference between the current image and a previous image, The boundary detection information, the scene change detection information, and the scene change detection information. The method according to claim 1,
The encoding-related prediction information includes at least one of a quantization factor for each encoding block, a weight for each region characteristic, and an encoding mode prediction value, or an output bit rate prediction value when the predicted encoding parameter is used. . The method according to claim 1,
Wherein the analysis information for each input video includes buffering time related information for the video sequence. Receiving and analyzing an image sequence including a plurality of input images and outputting analysis information for each input image;
Selecting encoding-related prediction information for each input image using analysis information for each input image;
Generating bit rate allocation information for assigning a bit rate to the input image using the input image analysis information and the encoding related prediction information;
Encoding the video sequence using the encoding related prediction information and the bit rate allocation information, and outputting the encoded bitstream;
And generating output bit rate information of the bit stream
≪ / RTI &
Wherein the step of generating the bit rate allocation information regenerates the bit rate allocation information on the basis of the output bit rate information of the bit stream,
Wherein the step of outputting the encoded bit stream comprises encoding the video sequence using the regenerated bit rate allocation information, and outputting the encoded video sequence. Receiving and analyzing an image sequence including a plurality of input images and outputting analysis information for each input image;
Selecting encoding-related prediction information for each input image using analysis information for each input image;
Generating bit rate allocation information for assigning a bit rate to the input image using the input image analysis information and the encoding related prediction information;
Encoding the video sequence using the bit rate allocation information and the encoding related prediction information, and outputting the encoded bitstream;
Generating output bit rate information of the bit stream;
Regenerating bit rate allocation information on the basis of the output bit rate information of the bit stream; And
Encoding the video sequence using the regenerated bit rate allocation information and the bitstream information,
And encoding the encoded data. delete
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