CN101742294A - Method and device for enhancing monitoring video compression ratio - Google Patents
Method and device for enhancing monitoring video compression ratio Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 32
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Abstract
The invention discloses a method and a device for enhancing monitoring video compression ratio. The method comprises: carrying out content monitoring alarm detection on the original video data of video data collection; selecting different parameter sets to code the original video data, wherein the parameter sets comprise parameters related to code rates, thus realizing adopting codes with different code rates under different alarm state. By intelligently and dynamically adjusting coding parameters during video compression coding in the invention, the code rate of monitoring video compression coding is greatly lowered, and simultaneously the part of code stream interesting to monitoring can have better quality.
Description
Technical field
The present invention relates to monitor video encoding compression field.
Background technology
In monitor video encoding compression field, the encoding compression of monitor video generally adopts the higher international video compression coding standard of compression efficiency to compress.Because the acquisition time of monitor video is very long, and has certain requirement for video quality, even therefore the compress mode of high compression ratio to compress later monitor video data volume still very big.Increase the monitor video compression ratio, reduce the monitor video code check and become a very urgent task.
Summary of the invention
The object of the present invention is to provide to increase the monitor video compression ratio, reduce the method for monitor video code check.
For this reason, it is clear and definite to have monitoring purposes at monitor video, and a large amount of data characteristic that have nothing to do with the monitoring application are arranged in the video data, the present invention proposes a kind of method that improves monitoring video compression ratio.
According to first aspect, the invention provides a kind of coding method of monitor video, comprising: the original video data for video data acquiring is carried out contents supervision's alarm detection; Based on testing result, select different parameter sets to encode for original video data, described parameter set comprises the parameter relevant with code check, realizes adopting under the different alarm condition coding of different code checks thus.
According to second aspect, the invention provides a kind of encoding device of monitor video, comprising: the video data acquiring unit is used to gather original video data; Memory, the storage original video data; The monitoring and detection alarm unit carries out contents supervision's alarm detection to original video data; Parameter set is selected based on testing result in the parameter set selecting unit, and described parameter set comprises the parameter relevant with code check; With, encoder utilizes parameter set and code check that original video data is encoded.
According to the third aspect, the invention provides a kind of video monitoring equipment, comprise as the described encoding device of second aspect.
The present invention is by operation parameter collection technology, parameters such as video coding frame per second, quantization parameter in dynamically adjusting, and with low frame per second, big quantization parameter carries out the compression of vast scale for video data long-time useless in the monitor video.When the relevant anomalous event of monitoring takes place, monitor video is carried out the higher coding of quality.Finally, realized that the code check of monitor video compressed encoding reduces significantly, can also make the interested that part of code stream of monitoring obtain better quality simultaneously by coding parameter intelligent, when dynamically regulating video compression coding.
Description of drawings
Below with reference to accompanying drawings specific embodiments of the present invention is described in detail, in the accompanying drawing:
Fig. 1 is the device structure schematic diagram according to raising monitoring video compression ratio of the present invention;
Fig. 2 (a) and (b), (c) and (d) illustrated required partial parameters that comprises of sequence parameter set, picture parameter set, head and macroblock layer and control information respectively.
Embodiment
Parameter set is a kind of by improving the video code flow structure, strengthens the method for coding flexibility and code stream error recovery capabilities.The parameter set of video coding can be divided into sequence parameter set and picture parameter set.Wherein, sequence parameter set acts on a string video image continuous in time, i.e. video sequence, and it comprises the public information of an image sequence, i.e. two public informations that refresh all images between (IDR) image immediately.Picture parameter set acts on one or more other images in the video sequence, and it comprises the public information of all bursts of an image, comprises image type, sequence number etc.A plurality of different sequences and picture parameter set can be stored in the decoder in advance.Encoder is selected suitable parameter set according to the memory location of the head of each coded slices (Slice), and picture parameter set itself also comprises the sequence parameter set information of use.Decoder is decoded based on the sequence and the image parameter set pair coded data of storage.Sequence and picture parameter set mechanism have reduced the transmission of repetition parameter.With network self-adapting layer (NAL) unit is example, each NAL unit comprises a sign, point to relevant picture parameter set, each picture parameter set comprises a sign, point to the content of relevant sequence parameter set, therefore, only use the pointer information of minority, just quote a large amount of parameters, significantly reduce the information that each NAL unit repeats to transmit.
The present invention is by operation parameter collection technology, parameters such as video coding frame per second, quantization parameter in dynamically adjusting, and with low frame per second, big quantization parameter carries out the compression of vast scale for video data long-time useless in the monitor video.When the relevant anomalous event of monitoring takes place, monitor video is carried out the higher coding of quality.Finally, realized that the code check of monitor video compressed encoding reduces significantly, can also make the interested that part of code stream of monitoring obtain better quality simultaneously by Rate Control parameter intelligent, when dynamically regulating video compression coding.
Fig. 1 is the device structure schematic diagram according to raising monitoring video compression ratio of the present invention.As shown in Figure 1, this equipment comprises video data acquiring unit, monitoring and detection alarm unit, memory, parameter set selecting unit and encoder.
At first, one section original video data F (t) of collection of video data acquiring equipment and input time t.This original video data can be stored in the memory.Then, the original video data of using monitoring and detection equipment that video data acquiring equipment is imported is carried out monitoring alarm and is detected, and sends warning message based on testing result to the parameter set selecting unit.The parameter set selecting unit selects different parameter set information to send to encoder based on warning message.At last, encoder is encoded to view data based on this parameter set information, and the video data that obtains compressing.Need to prove that the present invention also can adopt other monitoring alarm technology.In an example, can send warning message based on the testing result of the voice data that accompanies with video data.
In an example, sequence parameter set 1 and sequence parameter set 2 be respectively be used to have anomalous event a situation arises and normal condition under parameter set, sequence parameter set 1 includes the control data of high code rate, and sequence parameter set 2 includes the control data of low code check.If when t found to have the relevant anomalous event of monitoring to take place constantly, then the monitoring and detection alarm unit sent warning message to the parameter set selecting unit.The parameter set selecting unit selects sequence parameter set 1 to send to encoder according to warning message.Encoder uses the configuration of sequence parameter set 1 for encoding since the original video data of time t, up to t ' all clear.When all clear, the parameter set selecting unit selects sequence parameter set 2 to send to encoder according to warning message.Encoder uses the configuration of sequence parameter set 2 to encode for the video of moment t ' beginning.
According to the present invention, sequence parameter set 1 passes through to realize the coding for the different fine degree of code stream for parameter regulation relevant with code check such as frame per second, quantization parameters with sequence parameter set 2.In order to finish above function, need make amendment for the parameter of the sequence parameter set that has video encoding standard now, add for parameter control information relevant such as video sequence frame per second, quantization parameters with code check.In an example, in sequence parameter set, add the parameter control informations relevant such as frame_rate and seq_init_qp with code check, wherein parameter f rame_rate has indicated the frame per second information of sequence, and seq_init_qp has represented the quantization parameter value that sequence is initial.
In one embodiment, consider the spatial movement intrusion detection, the possible time-delay of technology such as voice-control alarm, for guaranteeing not omit important video data, the video data of a period of time that can prestore in memory or buffer is such as F (t-1), ..., F (t-N).When finding to have the relevant anomalous event of monitoring to take place, begin to carry out the higher coding of quality from that part of video data F (t-N) that prestores.
Fig. 2 (a) and (b), (c) and (d) illustrated required partial parameters that comprises of sequence parameter set, picture parameter set, head and macroblock layer and control information respectively.
The parameter s eq_parameter_set_id that sequential parameter is concentrated indicates id number of this sequence parameter set, will be quoted by picture parameter set for this id number.When encoder need produce new sequence parameter set, should use new seq_parameter_set_id.Simultaneously, new sequence parameter set can adopt the content in the original parameter set.New adding parameter f rame_rate has indicated the frame per second information of sequence, and parameter s eq_init_qp has represented the quantization parameter value that sequence is initial.
The parameter p ic_parameter_set_id that image parameter is concentrated is in order to specify the sequence number of this picture parameter set, and this sequence number is cited at the head of each sheet.Parameter s eq_parameter_set_id indicates the sequence number of the sequence parameter set that this picture parameter set quotes.Parameter p ic_qp_delta is used to calculate the quantization parameter value of present image.
Parameter p ic_parameter_set_id in the head is used to specify the call number of picture parameter set.Parameter p ic_qp_delta is used to calculate the quantization parameter value when anter.
The parameter m b_qp_delta of macroblock layer represents the quantization parameter side-play amount in the macroblock layer.
Quantization parameter is that sub-sequence parameter set, picture parameter set, head, macro block head provide for four layers in the method for the raising monitoring video compression ratio that designs in previous example.Certainly, also can take other different quantization parameter form.
Therefore, as shown in Figure 1, use monitoring and detection equipment to carry out monitoring alarm and detect for video data acquiring equipment input original video data.When t found to have the relevant anomalous event of monitoring to take place constantly, the configuration of using sequence parameter set 1 was for encoding since the original video data of time t-N, up to t ' all clear.When all clear, use the configuration of sequence parameter set 2 to encode for the video of moment t ' beginning.
Each parameter value in can configuration sequence parameter set 1 is as follows:
seq_parameter_set_id＝1；
frame_rate＝30；
seq_init_qp＝10。
Each parameter value in can configuration sequence parameter set 2 is as follows:
seq_parameter_set_id＝2；
frame_rate＝15；
seq_init_qp＝40。
So just realized for parameter regulation relevant such as frame per second, quantization parameters, cooperated the final coding of realizing for the different fine degree of code stream different piece of use of picture parameter set, head, macroblock layer etc. again with code check.
Use the method for raising monitoring video compression ratio of the present invention, the compression factor of the monitor video of longer-term storage is greatly improved, realized the new breakthrough on the monitor video compress technique.In addition, the present invention carries out high-quality compression at the same video of using at monitoring interested that can also make at present that reduces code check, makes that this part video is more clear.
Obviously, the present invention described here can have many variations, and this variation can not be thought and departs from the spirit and scope of the present invention.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of these claims.
Claims (14)
1. the coding method of a monitor video comprises:
Original video data for video data acquiring is carried out contents supervision's alarm detection,
Based on testing result, select different parameter sets to encode for original video data, described parameter set comprises the parameter relevant with code check, realizes adopting under the different alarm condition coding of different code checks thus.
2. coding method as claimed in claim 1, it is characterized in that described testing result shows that anomalous event is arranged, the step that the different parameter set of described selection is encoded for original video data comprises encodes to the parameter set of original video data employing high code rate.
3. coding method as claimed in claim 2, it is characterized in that described method is included in the video data of a period of time that prestores in memory or the buffer, the step that the different parameter set of described selection is encoded for original video data comprises from this section period video data that prestores and begins to adopt the parameter set of high code rate to encode.
4. coding method as claimed in claim 1 is characterized in that described method comprises that the voice data relevant with original video data carried out voice-control alarm detects the described testing result of generation.
5. coding method as claimed in claim 1 is characterized in that parameter set comprises sequence parameter set and picture parameter set.
6. coding method as claimed in claim 5 is characterized in that parameter set also comprises head and/or macroblock layer.
7. the encoding device of a monitor video comprises:
The video data acquiring unit is used to gather original video data;
Memory, the storage original video data;
The monitoring and detection alarm unit carries out contents supervision's alarm detection to original video data;
Parameter set is selected based on testing result in the parameter set selecting unit, and described parameter set comprises the parameter relevant with code check; With
Encoder utilizes parameter set and code check that original video data is encoded.
8. encoding device as claimed in claim 7 is characterized in that the described parameter relevant with code check comprises frame per second and/or quantization parameter.
9. encoding device as claimed in claim 7 is characterized in that described parameter set comprises sequence parameter set and picture parameter set.
10. encoding device as claimed in claim 9 is characterized in that parameter set also comprises head and/or macroblock layer.
11. encoding device as claimed in claim 7 is characterized in that described testing result shows that anomalous event is arranged, described parameter set selecting unit adopts the parameter set of high code rate to encode to original video data.
12. encoding device as claimed in claim 11 is characterized in that comprising memory or buffer, the video data of a period of time that is used to prestore, and described encoder begins to adopt the parameter set of high code rate to encode to this section period video data that prestores.
13. encoding device as claimed in claim 7 is characterized in that comprising acoustic control detection alarm unit, the voice data relevant with original video data is carried out voice-control alarm detect, thereby produce described testing result.
14. a video monitoring equipment comprises the described encoding device as one of claim 7-13.
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Effective date of registration: 20171221 Address after: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee after: Vimicro Electronics Co., Ltd. Patentee after: Zhongxing Technology Co., Ltd. Address before: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee before: Vimicro Electronics Co., Ltd. Patentee before: Beijing Vimicro Corporation |
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Address after: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee after: Vimicro Electronics Co., Ltd. Patentee after: Mid Star Technology Limited by Share Ltd Address before: 100083 Haidian District, Xueyuan Road, No. 35, the world building, the second floor of the building on the ground floor, No. 16 Co-patentee before: Vimicro Electronics Co., Ltd. Patentee before: Zhongxing Technology Co., Ltd. |
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