Data transmitter, data receiver, processor, equipment managing device, equipment managing system, data transmitting-receiving system, and medium
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-003/27
H04N-007/173
H04L-005/12
H04L-007/02
출원번호
US-0230995
(1999-02-05)
우선권정보
JP-0205633 (1996-08-05); JP-0306518 (1996-11-18)
국제출원번호
PCT/JP97/02672
(1997-07-31)
국제공개번호
WO98/06221
(1998-02-12)
발명자
/ 주소
Yamada, Masazumi
Iketani, Akira
Usui, Akira
Kobayashi, Masaaki
Takeda, Hidetoshi
출원인 / 주소
Matsushita Electric Industrial Co., Ltd.
대리인 / 주소
RatnerPrestia
인용정보
피인용 횟수 :
3인용 특허 :
15
초록▼
When transmitting encoded video data and audio data, a transmitter 201 also transmits a decoding method 107 generated by decoding-method generation means 203. In the case of a receiver 202, decoding control means 111 controls decoding means 208 in accordance with a received decoding method 113 and t
When transmitting encoded video data and audio data, a transmitter 201 also transmits a decoding method 107 generated by decoding-method generation means 203. In the case of a receiver 202, decoding control means 111 controls decoding means 208 in accordance with a received decoding method 113 and thereby, decodes video data and audio data 115. Thus, it is unnecessary for the receiver 202 to previously prepare all of a plurality of decoding methods and the transmitter 201 does not need to encode video data or audio data in accordance with the decoding method owned by the receiver 202.
대표청구항▼
When transmitting encoded video data and audio data, a transmitter 201 also transmits a decoding method 107 generated by decoding-method generation means 203. In the case of a receiver 202, decoding control means 111 controls decoding means 208 in accordance with a received decoding method 113 and t
When transmitting encoded video data and audio data, a transmitter 201 also transmits a decoding method 107 generated by decoding-method generation means 203. In the case of a receiver 202, decoding control means 111 controls decoding means 208 in accordance with a received decoding method 113 and thereby, decodes video data and audio data 115. Thus, it is unnecessary for the receiver 202 to previously prepare all of a plurality of decoding methods and the transmitter 201 does not need to encode video data or audio data in accordance with the decoding method owned by the receiver 202. rein the complexity of coding is given as the product of the number of bits generated and the quantization parameter. 3. A method for coding a signal representing a video or being accompanied with a video by quantization processing, the method comprising the steps of: detecting a scene change in the video; if the scene change has been detected, determining a quantization parameter adaptively to a scene newly appearing after the scenes have been changed; or unless the scene change is detected, determining the quantization parameter at such a value as to stabilize a coding rate; and performing the quantization processing using the quantization parameter determined, wherein if the scene change has been detected, the quantization parameter is determined based on an assigned coefficient, corresponding to a complexity of coding the signal, and a number of bits generated and calculated during a predetermined interval after the scene change, and bit assignment is performed such that if the complexity is higher, the coding rate gets higher, while if the complexity is lower, the coding rate gets lower. 4. The method of claim 3, wherein the assigned coefficient is obtained based on a target coding rate. 5. The method of claim 3, wherein the assigned coefficient is obtained based on an average of quantization parameters during a predetermined interval before the scene change is detected and an average of numbers of bits generated during the predetermined interval. 6. A method for coding a signal representing a video or being accompanied with a video by quantization processing, the method comprising the steps of: detecting a scene change in the video; if the scene change has been detected, determining a quantization parameter adaptively to a scene newly appearing after the scenes have been changed; or unless the scene change is detected, determining the quantization parameter at such a value as to stabilize a coding rate; and performing the quantization processing using the quantization parameter determined, wherein unless the scene change is detected, an accumulation of errors, each representing a difference between a number of bits generated and a target number of bits, is obtained, and the quantization parameter is determined by a feedback control using the accumulation, wherein a property of the feedback control is determined according to a number of bits assigned when the scene change has been detected. 7. The method of claim 6, wherein a characteristic of the feedback control is modified based on the errors. 8. The method of claim 6, wherein a time passed since coding processing was started is clocked, and the characteristic of the feedback control is modified based on the passed time clocked. 9. The method of claim 1, wherein if the scene change has been detected, a distortion sensitivity of the video after the scene change is detected, and the quantization parameter is determined based on the distortion sensitivity detected. 10. The method of claim 1, wherein if the scene change has been detected, a distortion sensitivity of the video after the scene change is detected, and a first quantization parameter is determined based on the distortion sensitivity detected, and wherein a number of bits generated during a predetermined interval after the scene change is calculated, and a second quantization parameter is determined based on the number of bits generated and calculated. 11. The method of claim 1, further comprising the step of estimating a storable capacity of a storage medium while recording coded data on the storage medium, wherein the quantization parameter is determined considering the storable capacity estimated as well. 12. A coder for coding a signal representing a video or being accompanied with a video, the coder comprising: a quantizer for quantizing the signal; an encoder for encoding the output of the quantizer and outputting coded data; means for supplying a quantization parameter to the quantizer; and means for detecting a scene change in the video, wherein if the detecting means has detected the scene change, the supplying means supplies a quantization parameter, which has been determined adaptively to a scene newly appearing after the scene change, to the quantizer, wherein unless the detecting means detects the scene change, the supplying means supplies a quantization parameter, which has been determined at such a value as to stabilize a coding rate, to the quantizer, and wherein if the scene change has been detected, a complexity of coding (X) is computed based on the quantization parameter (Q) and a number of bits generated (B), which are related as a function of B=f(X,Q), and bit assignment is performed so as to minimize the average of quantization parameter. 13. The coder of claim 12, wherein the complexity of coding is given as the product of the number of bits generated and the quantization parameter. 14. A method for coding a signal by quantization processing, the method comprising the steps of: obtaining an accumulation of errors, each representing a difference between a number of bits generated and a target number of bits; determining a quantization parameter by a feedback control using the accumulation; and performing the quantization processing using the quantization parameter determined, wherein a time passed since coding processing was started is clocked, and a characteristic of the feedback control is modified based on the passed time clocked. 15. The coder of claim 14, wherein the supplying means obtains the assigned coefficient based on a target coding rate. 16. The coder of claim 14, wherein the supplying means obtains the assigned coefficient based on an average of quantization parameters during a predetermined interval before the scene change is detected and an average of numbers of bits generated during the predetermined interval. 17. A coder for coding a signal representing a video or being accompanied with a video, the coder comprising: a quantizer for quantizing the signal; an encoder for encoding the output of the quantizer and outputting coded data; means for supplying a quantization parameter to the quantizer; and means for detecting a scene change in the video, wherein if the detecting means has detected the scene change, the supplying means supplies a quantization parameter, which has been determined adaptively to a scene newly appearing after the scene change, to the quantizer, wherein unless the detecting means detects the scene change, the supplying means supplies a quantization parameter, which has been determined at such a value as to stabilize a coding rate, to the quantizer, wherein unless the detecting means detects the scene change, the supplying means obtains an accumulation of errors each representing a difference between a number of bits generated and a target number of bits, and determines the quantization parameter by a feedback control using the accumulation, and wherein a property of the feedback control is determined according to a number of bits assigned when the scene change has been detected. 18. A coder for coding a signal representing a video or being accompanied with a video, the coder comprising: a quantizer for quantizing the signal; an encoder for encoding the output of the quantizer and outputting coded data; means for supplying a quantization parameter to the quantizer; and means for detecting a scene change in the video, wherein if the detecting means has detected the scene change, the supplying means supplies a quantization parameter, which has been determined adaptively to a scene newly appearing after the scene change, to the quantizer, wherein unless the detecting means detects the scene change, the supplying means supplies a quantization parameter, which has been determined at such a value as to stabilize a coding rate, to the quantizer, and a bit number calculator for calculating a number of bits of the c oded data, wherein when the detecting means detects the scene change, the supplying means determines the quantization parameter based on an assigned coefficient, corresponding to a complexity of coding the signal, and the number of bits calculated by the calculator during a predetermined interval after the scene change, and wherein bit assignment is performed such that if the complexity is higher, the coding rate gets higher, while if the complexity is lower, the coding rate gets lower. 19. The coder of claim 17, wherein the supplying means clocks a time passed since coding processing was started, and modifies the characteristic of the feedback control based on the passed time clocked. 20. The coder of claim 12, wherein when the detecting means detects the scene change, the supplying means detects a distortion sensitivity of the video after the scene change, and determines the quantization parameter based on the distortion sensitivity detected. 21. The coder of claim 12, further comprising a bit number calculator for calculating a number of bits of the coded data, wherein when the detecting means detects the scene change, the supplying means detects a distortion sensitivity of the video after the scene change, and determines a first quantization parameter based on the distortion sensitivity detected, and wherein after a predetermined interval has passed, the supplying means determines a second quantization parameter based on the number of bits calculated by the bit number calculator. 22. A recorder for recording a signal, representing a video or being accompanied with a video, on a storage medium, wherein the recorder includes the coder as recited in claim 12, and records the coded data, which has been output from the coder, on the storage medium. 23. The recorder of claim 22, further comprising means for estimating a storable capacity of the storage medium, wherein the means for supplying a quantization parameter of the coder determines the quantization parameter considering the storable capacity estimated by the estimating means as well.
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