WO2009028830A1 - Dispositif et procédé permettant de maintenir le débit binaire de données d'image - Google Patents

Dispositif et procédé permettant de maintenir le débit binaire de données d'image Download PDF

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Publication number
WO2009028830A1
WO2009028830A1 PCT/KR2008/004866 KR2008004866W WO2009028830A1 WO 2009028830 A1 WO2009028830 A1 WO 2009028830A1 KR 2008004866 W KR2008004866 W KR 2008004866W WO 2009028830 A1 WO2009028830 A1 WO 2009028830A1
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WO
WIPO (PCT)
Prior art keywords
bit
pixel data
line pixel
data frame
image
Prior art date
Application number
PCT/KR2008/004866
Other languages
English (en)
Inventor
Hyoung Jin Kwon
Hyunsang Park
Woo Yong Lee
Jin Kyeong Kim
Kyeongpyo Kim
Original Assignee
Electronics And Telecommunications Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020080021373A external-priority patent/KR101409526B1/ko
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to US12/669,819 priority Critical patent/US20100183078A1/en
Publication of WO2009028830A1 publication Critical patent/WO2009028830A1/fr

Links

Classifications

    • 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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/184—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being bits, e.g. of the compressed video stream
    • 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
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • 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
    • H04N19/164—Feedback from the receiver or from the transmission channel
    • 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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
    • 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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component

Definitions

  • the present invention relates to an apparatus and method of uniformly maintaining a bit rate of image data, and more particularly, to an apparatus and method of uniformly maintaining a bit rate of image data in a wireless environment.
  • a bit rate of the image data needs to be uniformly maintained for real-time transmission.
  • an encoding bit rate may change, which may change the bit rate.
  • a rate control scheme may be used to uniformly maintain the bit rate.
  • the rate control scheme performs lossy compression, there is a disadvantage in that the picture quality of a video may be deteriorated.
  • the deterioration phenomenon stands out in a high definition (HD) image, a viewer may feel uncomfortable with viewing the original image as is.
  • An aspect of the present invention provides an apparatus and method of uniformly maintaining a bit rate of image data that can compress image data for each line according to characteristics of the image data and a channel, and transmit the compressed image data and thereby can uniformly maintain a bit rate of the image data.
  • an image encoding apparatus including: a bit shifter configured to shift a predetermined number of bits included in line pixel data of a single line; an encoder configured to compress the bit shifted line pixel data and output a compressed bitstream; and a data frame formatter configured to generate a data frame including a bit shift field, the bit shift field containing information associated with the shifted bit of the pixel data.
  • an image decoding apparatus including: a data frame deformatter configured to receive a data frame and extract a field value from the data frame; a decoder configured to decode a compressed bitstream from the data frame, and recover line pixel data; a bit shifter configured to shift a predetermined number of bits included in the line pixel data; and a bit recovery unit configured to recover a lost bit with respect to an output signal of the bit shifter.
  • a method of encoding an image including: adjusting a resolution of line pixel data of a single line; compressing the line pixel data with the adjusted resolution to output a compressed bitstream; generating a data frame including the bitstream; and transmitting the generated data frame.
  • a method of decoding an image including: receiving a data frame to extract a field value from the data frame; decoding a compressed bitstream from the data frame to recover line pixel data; recovering a resolution of the line pixel data; and recovering a lost bit with respect to the line pixel data with the recovered resolution.
  • FIG. 1 is a block diagram illustrating a configuration of an image encoding apparatus according to an embodiment of the present invention
  • FIG. 2 illustrates a format of a data frame in which each line of an image is compressed according to an embodiment of the present invention
  • FIG. 3 is a block diagram illustrating a configuration of an image decoding apparatus according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating an image encoding method according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating an image decoding method according to an embodiment of the present invention. Mode for the Invention
  • the basic principle of the present invention is to compress image data for each line according to characteristics of the image data and a channel, and transmit the compressed image data and thereby to uniformly maintain a bit rate of the image data.
  • an image encoding/decoding apparatus may uniformly maintain the bit rate of image data.
  • FIG. 1 is a block diagram illustrating a configuration of an image encoding apparatus according to an embodiment of the present invention.
  • the image encoding apparatus includes a bit shifter 11, an encoder 12, a buffer 13, a data frame formatter 14, and a first in first out (FIFO) buffer 15.
  • the image encoding apparatus may process image data for each line pixel unit.
  • the line pixel indicates 3072 Red-Green-Blue (RGB) sub pixels corresponding to 1024 pixels of the horizontal line in, for example, a 1024 x 768 image.
  • RGB Red-Green-Blue
  • the bit shifter 11 may adjust the resolution of pixels. Specifically, the bit shifter 11 may shift, to the right, a predetermined number of bits included in a line based on an image depth to be adjusted and thereby reduce the resolution of pixels.
  • the image depth may be a number of bits that can classify each color according to the saturation.
  • the line pixel data received by the bit shifter 11 may be image data of which the image depth is 7 and that indicates one of saturation indexes divided into 128 steps.
  • the bit shifter 11 may shift the 7 -bit line pixel data two bits to the right.
  • 5-bit line pixel data may be output from the bit shifter 11 and the output line pixel data may have the image depth of 5.
  • the bit shifter 11 may reduce the image depth and thereby reduce the resolution of pixels.
  • the bit shifter 11 may assign a different resolution for each color. Since the eye sensitivity is different for each color, the bit shifter 11 may adjust the resolution of each color and thereby providing an improved image. For example, in comparison to red or blue, when green is lost, the eye may be more sensitive to green. Therefore, the bit shifter 11 may increase the resolution of green to be greater than the resolution of red or blue. Through this, the bit shifter 11 may enable fine adjustment with respect to the image.
  • the encoder 12 may receive line pixel data of a single line with the adjusted resolution and output a compressed bitstream to the buffer 13.
  • the encoder 12 may receive line pixel data of a plurality of lines.
  • the encoder 12 may output the length of the compressed bitstream to the data frame formatter 14.
  • the encoder 12 may be a lossless encoder, but the present invention is not limited thereto. Specifically, the encoder 12 may be a lossy encoder with a relatively less loss.
  • the buffer 13 may receive the compressed bitstream from the encoder 12 to transfer the received bitstream to the data frame formatter 14 for each line unit.
  • the data frame formatter 14 may receive an output signal of the encoder 12 and the buffer 13 to generate a data frame.
  • the data frame includes a bit shift field, a compressed bitstream length field, and a compressed bitstream field.
  • the FIFO buffer 15 may be a buffer that is configured to performing FIFO.
  • FIFO buffer 15 may output the compressed bitstream to a transmitting end.
  • the FIFO buffer 15 may determine an image depth based on a bitstream amount of line pixel data of a previous line and a remaining bitstream amount after transmitting the bitstream of the line pixel data of the previous line.
  • the FIFIO buffer 15 may transfer the image depth to the bit shifter 11.
  • FIG. 2 illustrates a format of a data frame in which each line of an image is compressed according to an embodiment of the present invention.
  • the data frame includes a bit shift field 21, a compressed bitstream length field 22, and a compressed bitstream field 23.
  • the bit shift field 21 indicates a bit-shifted level of line pixel data of a current line, that is, a number of shifted bits. Specifically, the bit shift field 21 indicates a predetermined number of bits that are shifted to the right among total bits of original line pixel data in order to adjust a predetermined transmission bit rate.
  • the bit shift field 21 may be four bits.
  • the bit shift field 21 indicates an adjusted bit of zero through 15. For example, when changing 7-bit line pixel data classified into 128 steps to 5-bit line pixel data classified into 32 steps, the original line pixel data may be shifted two bits to the right. In this case, the bit shift field 21 may be indicated as 0010.
  • the compressed bitstream length field 22 indicates a data amount of the compressed bits team with respect to the line pixel data.
  • the bit shift field 21 and the compressed bitstream length field 22 may be used to determine the image depth of a subsequent line when encoding the subsequent line.
  • the compressed bitstream field 23 is a playload and indicates the compressed bitstream data.
  • FIG. 3 is a block diagram illustrating a configuration of an image decoding apparatus according to an embodiment of the present invention.
  • the image decoding apparatus includes a data frame deformatter
  • the data frame deformatter 31 may decode a data frame and extract each field value from the decoded data frame. Specifically, the data frame deformatter 31 may extract a field value of each of the bit shift field 21, the compressed bitstream length field 22, and the compressed bitstream field 23 included in the data frame.
  • the decoder 32 may decode a compressed bitstream included in an extracted single line and recover the line pixel data.
  • the bit shifter 33 may recover the resolution of the line pixel data. Specifically, the bit shifter 33 may shift, to the left, the line pixel data by the bit shift field value that is extracted from the data frame deformatter 31 and thereby recover the original resolution. For example, when it is assumed that the line pixel data includes five bits and a bit shift field is 0010, the bit shifter 33 may shift the line pixel data two bits to the left. Through this, the bit shifter 33 may output 7 -bit line pixel data and thereby recover the resolution of the line pixel data.
  • the bit recovery unit 34 may recover data that is lost when adjusting the resolution of image encoding. Specifically, the bit recovery unit 34 may obtain a bit value in a location where the data is lost due to the bit adjustment, from a value of previous line pixel data in the same location, and thereby recover the bit value. In this instance, a lower bit value with respect to an average of line pixel data of previous lines may be used as the value of previous line pixel data. Also, a lower bit value of line pixel data of a previous line may be used as the value of previous line pixel data.
  • lower two bits of the line pixel data may have a low value of 00 or may have random data.
  • the lower two bits may correspond to the data that is lost when adjusting the resolution of image encoding. Therefore, the lost lower two bits may be recovered using lower two bits with respect to the average of line pixel data of previous lines. Also, the lost lower two bits may be recovered using lower two bits of line pixel data of a previous line.
  • the image encoding/decoding apparatus may transmit and receive line pixel data for each line.
  • the image encoding/ decoding apparatus may change a compressed data amount to be transmitted by adjusting the resolution for each line pixel. Specifically, it is possible to uniformly maintain a bit rate of line pixel data with respect to the whole screen by adaptively changing the line pixel data according to channel characteristics. Therefore, according to the present invention, the image encoding/decoding apparatus may improve the deterioration phenomenon of image picture quality that may occur due to the change in the bit rate.
  • FIG. 4 illustrates an image encoding method according to an embodiment of the present invention.
  • the image encoding method may adjust the resolution of line pixel data of a single line.
  • the resolution of line pixel data may be adjusted by a bit shifter.
  • the bit shifter may shift, to the right, a predetermined number of bits included in the line pixel data based on the image depth and thereby reduce the resolution of the line pixel data.
  • the image depth may be determined by predicting a compressed data amount of a current line based on a compressed data amount of a previous line and a transmission data amount.
  • the image encoding method may encode the line pixel data with the adjusted resolution.
  • the line pixel data may be encoded according to a lossless encoding scheme and be output as a compressed bitstream.
  • the lossless encoding scheme may be, for example, a Huffman encoding scheme, but the present invention is not limited thereto.
  • the Huffman encoding scheme allocates a relatively short encoded word to frequently appearing input data and allocates a relatively long encoded word to less frequently appearing input data.
  • the image encoding method may generate a data frame.
  • the data frame for line pixel data may be generated.
  • the data frame includes a bit shift field, a compressed bitstream length field, and a compressed bitstream field.
  • the data frame may be transmitted via a transmitting end.
  • FIG. 5 is a flowchart illustrating an image decoding method according to an embodiment of the present invention.
  • the image decoding method may extract a field value from a received data frame.
  • the image decoding method may decode the received data frame to extract a field value from each of a bit shift field, a compressed bitstream length field, and a compressed bitstream field.
  • the image decoding method may decode the compressed bitstream.
  • the image decoding method may decode the compressed bitstream by referring to the compressed bitstream length field and thereby recover the line pixel data.
  • the image decoding method may recover the resolution of the line pixel data.
  • the image decoding method may be aware of an adjustment level of the resolution, that is, a bit adjustment value by referring to the bit shift field and recover the resolution of the line pixel data using the bit adjustment value.
  • the image decoding method may recover a lost bit value.
  • the image decoding method may obtain a bit value in a location where the data is lost due to the bit adjustment, from a value of previous line pixel data in the same location, and thereby recover the bit value.
  • a lower bit with respect to an average of line pixel data of previous lines may be used as the value of previous line pixel data.
  • a lower bit value of line pixel data of a previous line may be used as the value of previous line pixel data.
  • the above-described image encoding/decoding method may compress image data for each line according to characteristics of a channel and the image data and thereby uniformly maintain a bit rate of the image data. Therefore, the image encoding/ decoding method may significantly decrease loss of image data in a radio channel that may change over time.
  • the exemplary embodiments of the present invention include computer-readable media including program instructions to implement various operations embodied by a computer.
  • the media may also include, alone or in combination with the program instructions, data files, data structures, tables, and the like.
  • the media and program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well known and available to those having skill in the computer software arts.
  • Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD ROM disks; magneto-optical media such as floptical disks; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory devices (ROM) and random access memory (RAM).
  • Examples of program instructions include both machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter.
  • an apparatus and method of uniformly maintaining a bit rate of image data that can compress image data for each line according to characteristics of the image data and a channel, and transmit the compressed image data and thereby can uniformly maintain a bit rate of the image data. Therefore, it is possible to improve the deterioration phenomenon of image picture quality.

Abstract

L'invention concerne un dispositif permettant de maintenir un débit binaire de données d'image comprenant un dispositif de codage d'image comprenant lui-même: un décaleur de bits conçu pour décaler un nombre prédéterminé de bits inclus dans des données de pixels de ligne d'une ligne unique: un codeur conçu pour compresser les données de pixels de ligne à bits décalés et générer un train binaire compressé; et un formateur de trames de données conçu pour générer une trame de données avec champ de décalage de bits, lequel champ renferme des informations sur le bit décalé des données de pixel, et un dispositif de décodage d'image comprenant: un déformateur de trame de données conçu pour recevoir une trame de données et en extraire une valeur de champ; un dispositif conçu pour décoder un train de données compressé dans une trame de données et extraire des données de pixel de ligne; un décaleur de bits conçu pour décaler un nombre prédéterminé de bits: et une unité de récupération de bits permettant de récupérer un bit perdu.
PCT/KR2008/004866 2007-08-28 2008-08-21 Dispositif et procédé permettant de maintenir le débit binaire de données d'image WO2009028830A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/669,819 US20100183078A1 (en) 2007-08-28 2008-08-21 Apparatus and method for keeping bit rate of image data

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20070086771 2007-08-28
KR10-2007-0086771 2007-08-28
KR10-2008-0021373 2008-03-07
KR1020080021373A KR101409526B1 (ko) 2007-08-28 2008-03-07 영상 데이터의 비트율을 일정하게 유지시키는 장치 및 방법

Publications (1)

Publication Number Publication Date
WO2009028830A1 true WO2009028830A1 (fr) 2009-03-05

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WO (1) WO2009028830A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010043282A1 (en) * 1997-10-06 2001-11-22 Xiaoping Hu Multi-function USB video capture chip using bufferless data compression
US20060053004A1 (en) * 2002-09-17 2006-03-09 Vladimir Ceperkovic Fast codec with high compression ratio and minimum required resources
US20070086528A1 (en) * 2005-10-18 2007-04-19 Mauchly J W Video encoder with multiple processors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010043282A1 (en) * 1997-10-06 2001-11-22 Xiaoping Hu Multi-function USB video capture chip using bufferless data compression
US20060053004A1 (en) * 2002-09-17 2006-03-09 Vladimir Ceperkovic Fast codec with high compression ratio and minimum required resources
US20070086528A1 (en) * 2005-10-18 2007-04-19 Mauchly J W Video encoder with multiple processors

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