WO2001035671A1 - Method of transmission of image by cdma system - Google Patents
Method of transmission of image by cdma system Download PDFInfo
- Publication number
- WO2001035671A1 WO2001035671A1 PCT/CN2000/000336 CN0000336W WO0135671A1 WO 2001035671 A1 WO2001035671 A1 WO 2001035671A1 CN 0000336 W CN0000336 W CN 0000336W WO 0135671 A1 WO0135671 A1 WO 0135671A1
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- WO
- WIPO (PCT)
- Prior art keywords
- image
- coding
- transmission
- rate
- transmission method
- Prior art date
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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
- H04N19/136—Incoming video signal characteristics or properties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
-
- 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
- H04N19/103—Selection of coding mode or of prediction mode
-
- 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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
-
- 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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates
-
- 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
- H04N19/124—Quantisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
Definitions
- the present invention relates to the field of image compression coding technology and code division multiple access (CDMA) mobile communication technology, and in particular, to a method for implementing image compression coding and transmission that can adapt to the soft capacity characteristics of a CDMA system.
- CDMA code division multiple access
- a certain degree of compression can be performed on the image data under the condition that a certain degree of distortion is allowed.
- the compression ratio is different due to the different image properties. For example, when the size of entropy is different, an image with large entropy should be compressed more, and an image with lower entropy should be compressed less. For another example, for a moving image, if the change is slow, the compression ratio should be higher than the normal value. Is to reduce the frame rate of image encoding and decoding. Therefore, for different image encoding frames, in order to ensure the quality of image transmission, different image compression ratios should be used, that is, the image encoding rate should be changed accordingly.
- CDMA code division multiple access
- system capacity is a concept of soft capacity.
- the system operator can increase the frame error rate during peak traffic periods, thereby increasing the number of available channels.
- CDMA is a self-interference system, when the load on its neighboring cell is light, the interference experienced by this cell is corresponding. If it is reduced, the capacity can be increased appropriately.
- the features of soft capacity also include residential breathing function and so on.
- the digital image coding algorithm uses a fixed rate algorithm controlled by an external command, such as the CCITT H.261 algorithm.
- an external command control algorithm cannot consider the nature of the image itself.
- the coding rate is a A fixed amount
- the existing fixed-rate algorithm controlled by external commands cannot consider the nature of the image itself, so that the characteristics of the soft capacity of the CDMA system cannot be used well. Summary of the invention
- the purpose of the present invention is to solve the problem that the fixed-rate coding algorithm cannot adapt to the characteristics of the system's soft capacity when the image transmission of the CDMA system is adopted, and proposes to change the image coding rate according to the specific characteristics of the image, so that the system capacity in the statistical sense is increased. Image transmission method.
- the present invention provides an image transmission method for maintaining image transmission quality and increasing capacity of a code division multiple access (CDMA) mobile communication system.
- the method includes at least the following steps:
- the present invention provides an image transmission method for maintaining image transmission quality and increasing capacity of a code division multiple access (CDMA) mobile communication system.
- the method includes at least the following steps:
- variable rate coding according to the nature of the image
- the present invention provides an image transmission method for maintaining image transmission quality and increasing capacity of a code division multiple access (CDMA) mobile communication system.
- the method includes at least the following steps:
- variable rate coding according to the nature of the image
- the above-mentioned variable rate coding may use a threshold subband coding or a differential prediction coding.
- the thresholded subband coding method includes at least the following steps:
- the compression coding can use conventional compression coding.
- the decomposed image may be further subjected to threshold subband coding.
- the rate of image coding may be reduced by increasing the set threshold to increase the capacity of the system.
- the differential prediction encoding method includes at least the following steps:
- the calculation time is the image difference between the two frames before and after
- a high compression ratio algorithm is used. Since the CDMA system is a self-interference system, its capacity is a concept of soft capacity. There is a certain proportional relationship between the coding rate and the transmission power. When the coding rate is changed and the transmission power is changed, the system capacity can be obtained accordingly. increase. Therefore, under the condition of maintaining the image transmission quality, if the compression rate of the encoding rate is changed and the encoding rate is changed according to the specific properties of the image, the compression rate of the image encoding may be further increased. This makes it possible to increase the soft capacity of a CDMA transmission system in a statistical sense. However, the existing external command control algorithm does not consider the nature of the image itself, so that the soft capacity characteristics of the CDMA system cannot be used well.
- variable-rate image compression coding transmission method of the present invention By adopting the variable-rate image compression coding transmission method of the present invention, the stability of image properties can be maintained, and the capacity of a CDMA system in a statistical sense can be increased.
- FIG. 1 is a schematic diagram of a thresholded subband coding process according to the present invention.
- FIG. 2 is a flowchart of increasing the system capacity by changing the spreading factor according to the present invention.
- FIG. 3 is a flowchart of using the intermittent transmission method without changing the spreading factor of the present invention.
- Mode for Carrying Out the Invention The present invention is described in detail below with reference to the drawings.
- the present invention adopts an encoding method that uses the image's own properties to change the compression ratio of an image, and changes the encoding rate accordingly, thereby maintaining stable image quality.
- the above-mentioned object is achieved by encoding an image by using a band-type subband coding image compression method, a differential prediction coding image compression method, and the like.
- the process of subband coding using a thresholded subband coding class image compression algorithm is shown in Figure 1.
- the specific process is as follows: (a) The original image A is decomposed into four parts: 1, 2, 3, and 4; each part has different properties. For example, after using a fast Fourier transform (FFT), the frequency characteristics of each part of the image are different. These transforms also include discrete cosine transform (DCT), wavelet transform, etc., each part of the transformed image has correspondingly different properties.
- FFT fast Fourier transform
- DCT discrete cosine transform
- the part of 1 is basically a reduced image of image A, and the data is similar to that of image A; only a small part of the data of 2 and 3 is larger, and the other is close to zero; and the data of 4 is almost all close to zero.
- a threshold X is set.
- the threshold X can be set to 0.2.
- the absolute value of the data in images 1, 2, 3, and 4 is less than This value makes them zero.
- Subband coding can be continued for images 1 or 2, 3, and 4. In this way, they are broken down into 4 pieces each. Since the data of images 2, 3, and 4 are basically close to zero, generally only image 1 is sub-band encoded.
- Differential prediction coding is particularly suitable for moving images.
- the specific process is to set a moving image.
- a and B are two frames before and after.
- d distance (A, B), which represents the difference between A and B images. This distance function should satisfy the visual relationship of the images.
- a threshold value X is set according to the visual characteristics of the human eye and a certain statistical algorithm.
- the function of this threshold value is similar to the threshold of subband coding.
- d> x it indicates that the difference between A and B images is large. If you ca n’t compress too much, use a low compression ratio algorithm and set the compression ratio to kl. When 0 ⁇ , it means that there is not much difference between A and B images. Increasing compression will not affect the image quality. Therefore, a high compression ratio algorithm is used. Let its compression ratio be k2. From the above, k] ⁇ k2.
- the values of kl and k2 and the specific value of threshold X are related to the requirements of the application system.
- the threshold subband coding mode and differential prediction coding mode By changing the threshold subband coding mode and differential prediction coding mode, it is possible to change the compression ratio and coding rate according to the nature of the image, thereby maintaining the stability of the image quality and making it possible to increase the statistical capacity of the CDMA system. Because, in a general image coding algorithm, if a certain image is compiled, the coding rate of a certain frame of image is kl, and the spreading gain is SF1. In the case of changing the rate coding, the coding rate becomes k2 If the spreading gain is SF2, the following relationship exists:
- E b energy per bit at the source of the transmitted digital signal
- N 0 noise power spectral density in the channel
- E c In the spread spectrum communication, the energy of the spreading chip after spreading the digital signal is set to 101ogk2 / kl.
- the spreading gain and transmission power of the system need to be changed.
- the capacity of the channel can be increased. For example, when the rate of image coding is reduced by half, the transmission power is also reduced by half. From a statistical sense, it means that it can increase regular users by 50%.
- the system can also use Intermittent sending technology. Intermittent transmission technology means that signals are sometimes transmitted over a small period of time, and sometimes signals are not transmitted. Since the image frame rate cannot be noticed as long as the frame rate is greater than 25 frames per second, as long as the discontinuity time is less than 1/25 of a second, people cannot notice it.
- the process of intermittent transmission is shown in FIG. 3, and the system is first initialized; then the variable rate coding is performed according to the nature of the image, and the variable rate coding here is the aforementioned subband coding with threshold and / or differential prediction coding; Then, the discontinuity point is calculated according to the image coding rate. Specifically, the starting point and the end point are calculated first, and then the free space between them is calculated, so that the discontinuity point can be known. Then the interleaving process is performed, that is, the interleaving algorithm is used for the bits that are sent intermittently. Randomize it in the frame and rearrange it; finally, add it to the spreading address code by spreading, and then transmit it to complete the encoding transmission process of one frame. After that, the number of frames is increased by 1, and the steps after the initialization are returned, and the next frame is encoded and transmitted.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/857,853 US6407990B1 (en) | 1999-11-11 | 2000-10-17 | Method of transmission of image by CDMA system |
JP2001537286A JP2003514465A (ja) | 1999-11-11 | 2000-10-17 | 符号分割多元アクセス通信システムの画像伝送方法 |
AU77693/00A AU7769300A (en) | 1999-11-11 | 2000-10-17 | Method of transmission of image by cdma system |
EP00967508A EP1229737A4 (en) | 1999-11-11 | 2000-10-17 | CDMA BILDUEBERTRAGUNGSSYSTEM |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB991223004A CN1138354C (zh) | 1999-11-11 | 1999-11-11 | 码分多址技术和变速率图像压缩编码技术相结合的传输方法 |
CN99122300.4 | 1999-11-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001035671A1 true WO2001035671A1 (en) | 2001-05-17 |
Family
ID=5282426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2000/000336 WO2001035671A1 (en) | 1999-11-11 | 2000-10-17 | Method of transmission of image by cdma system |
Country Status (7)
Country | Link |
---|---|
US (1) | US6407990B1 (zh) |
EP (1) | EP1229737A4 (zh) |
JP (1) | JP2003514465A (zh) |
KR (1) | KR100585999B1 (zh) |
CN (1) | CN1138354C (zh) |
AU (1) | AU7769300A (zh) |
WO (1) | WO2001035671A1 (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101146030B (zh) * | 2006-09-14 | 2010-04-14 | 联想(北京)有限公司 | 一种信道资源的动态分配方法及装置 |
CN104754340B (zh) * | 2015-03-09 | 2020-02-21 | 南京航空航天大学 | 一种无人机侦察图像压缩方法 |
CN105763855B (zh) * | 2016-04-22 | 2018-12-07 | 微景天下(北京)科技有限公司 | 图像传输系统和图像传输方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1113369A (zh) * | 1993-11-08 | 1995-12-13 | 移动通信网株式会社 | 一个cdma通信的方法和系统 |
CN1251725A (zh) * | 1996-10-11 | 2000-04-26 | 夸尔柯姆股份有限公司 | 用于数码视频压缩的自适应速率控制 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4901307A (en) * | 1986-10-17 | 1990-02-13 | Qualcomm, Inc. | Spread spectrum multiple access communication system using satellite or terrestrial repeaters |
US5204876A (en) * | 1991-03-13 | 1993-04-20 | Motorola, Inc. | Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system |
US5239557A (en) * | 1992-04-10 | 1993-08-24 | Ericsson/Ge Mobile Communications | Discountinuous CDMA reception |
CA2118880A1 (en) * | 1994-03-11 | 1995-09-12 | Kannan Ramchandran | Jpeg/mpeg decoder-compatible optimized thresholding for image and video signal compression |
ZA965340B (en) * | 1995-06-30 | 1997-01-27 | Interdigital Tech Corp | Code division multiple access (cdma) communication system |
US6049535A (en) * | 1996-06-27 | 2000-04-11 | Interdigital Technology Corporation | Code division multiple access (CDMA) communication system |
-
1999
- 1999-11-11 CN CNB991223004A patent/CN1138354C/zh not_active Expired - Fee Related
-
2000
- 2000-10-17 EP EP00967508A patent/EP1229737A4/en not_active Ceased
- 2000-10-17 US US09/857,853 patent/US6407990B1/en not_active Expired - Lifetime
- 2000-10-17 JP JP2001537286A patent/JP2003514465A/ja active Pending
- 2000-10-17 AU AU77693/00A patent/AU7769300A/en not_active Abandoned
- 2000-10-17 WO PCT/CN2000/000336 patent/WO2001035671A1/zh active IP Right Grant
- 2000-10-17 KR KR1020017009536A patent/KR100585999B1/ko active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1113369A (zh) * | 1993-11-08 | 1995-12-13 | 移动通信网株式会社 | 一个cdma通信的方法和系统 |
CN1251725A (zh) * | 1996-10-11 | 2000-04-26 | 夸尔柯姆股份有限公司 | 用于数码视频压缩的自适应速率控制 |
Also Published As
Publication number | Publication date |
---|---|
CN1138354C (zh) | 2004-02-11 |
KR100585999B1 (ko) | 2006-06-01 |
EP1229737A4 (en) | 2007-07-11 |
AU7769300A (en) | 2001-06-06 |
JP2003514465A (ja) | 2003-04-15 |
EP1229737A1 (en) | 2002-08-07 |
US6407990B1 (en) | 2002-06-18 |
KR20020057795A (ko) | 2002-07-12 |
CN1296359A (zh) | 2001-05-23 |
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