CN102932649A - Video decoding quality detection method and device of set top box - Google Patents
Video decoding quality detection method and device of set top box Download PDFInfo
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Abstract
The embodiment of the invention discloses a video decoding quality detection method and device, relating to the field of IPTV (Internet Protocol Television) detection and improving the video quality detection accuracy of the set top box. The video decoding quality detection method comprises the following steps of: embedding first feature information into an uncoded original video sequence to obtain a feature sequence; coding the feature sequence to obtain a video bitstream and sending the video bitstream into the set top box; receiving a video file which is acquired by an acquisition card and comprises an analog video signal and decoding the video file to obtain a decoded video sequence; carrying out feature extraction on the decoded video sequence to obtain second feature information; and comparing the first feature information with the second feature information and outputting a comparison result. The video decoding quality detection method and device disclosed by the embodiment of the invention are mainly used for a process of decoding quality detection of the set top box.
Description
Technical field
The present invention relates to the IPTV detection field, relate in particular to set-top box video decoding quality detection method and device.
Background technology
Along with the development of the Internet, Web TV (IPTV, Internet Protocol Television) business has obtained extensive popularization.Set-top box is as the terminal of IPTV, and the vision signal of its decoding output generally all is analog signal, and its major function is exactly the receiver, video code stream, decoding and output video program.
The method of at present set top box decodes test adopts method for subjective testing usually.When this kind method realizes, need to organize a collection of tester, allow them in a video measurement environment, watch continuously the video sequence of set top box decodes output, then adopt distinct methods to allow them that the quality of video image is marked, try to achieve on average at last and appraise, assess the video quality of set top box decodes with this.In above-mentioned method for subjective testing, because the difference of the test environments such as selection of viewing distance, observing environment, cycle tests has affected the evaluation of subjective testing, the poor accuracy that causes the set-top box video decoding quality to detect; And, because set top box decodes output is analog signal, adopt the method for subjective testing will be so that the objectivity of the effective evaluation of set-top box video decoding output quality is reduced; In sum, because the set top box decodes output quality is not had effective objective evaluation and accurate testing result, so that set-top box video decoding output quality detection accuracy is poor.
Summary of the invention
Embodiments of the invention provide a kind of set-top box video decoding quality detection method and device, have improved the accuracy of set-top box video quality testing.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The method that a kind of set-top box video decoding quality detects comprises:
First Characteristic information is embedded in the original video sequence of un-encoded and obtains characteristic sequence;
Described characteristic sequence encoded obtains video code flow, and described video code flow is sent to set-top box, obtains analog video signal so that described set-top box is decoded to described video code flow;
Receive the video file that comprises described analog video signal of capture card collection, described video file decoded obtains decoded video sequence, and described video file is that described capture card receives the video file that the described decoded video sequence of described set-top box output forms;
Decoded video sequence is carried out feature extraction, obtain Second Characteristic information;
Described First Characteristic information and described Second Characteristic information are compared, and comparative result is exported.
The device that a kind of set-top box video decoding quality detects comprises:
Embedded unit obtains characteristic sequence for the original video sequence that First Characteristic information is embedded into un-encoded;
Coding unit, the described characteristic sequence that described embedded unit is generated is encoded and is obtained video code flow;
Transmitting element is used for the described video code flow that described coding unit generates is sent to set-top box, obtains analog video signal so that described set-top box is decoded to described video code flow;
Receiving element is for the video file that comprises described analog video signal that receives the capture card collection;
Decoding unit, being used for the described video file that described receiving element receives decoded obtains decoded video sequence;
Extraction unit is used for described decoded video sequence that the described embedded location according to described recording unit records generates described decoding unit decodes and carries out feature extraction and obtain Second Characteristic information;
Comparing unit is used for the described Second Characteristic information of described First Characteristic information and the extraction of described extraction unit is compared;
Output unit, the result who compares for the described Second Characteristic information with described First Characteristic information and the extraction of described extraction unit exports.
Method and device that the set-top box video decoding quality that the embodiment of the invention provides detects, by in original video sequence, embedding First Characteristic information, gather and the decoded Second Characteristic information of extractor top box, First Characteristic information and Second Characteristic information are compared, come the set-top box of tested person is carried out quality testing, do not need the tester to come the quality of the set-top box of tested person is estimated by sensory information, detect to the set-top box video decoding quality effective objective evaluation is provided; And because test platform provides stable test environment, so that the accuracy that the set-top box video decoding quality detects improves; In sum, because the set-top box video decoding quality detects the raising that effective objective evaluation and set-top box video decoding quality accuracy of detection have been arranged, so that the accuracy that the set-top box video decoding quality detects improves.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow diagram that a kind of set-top box video decoding quality detects in the embodiment of the invention 1;
Fig. 2 is the composition frame chart of a kind of set-top box video decoding quality checkout gear in the embodiment of the invention 2;
Fig. 3 is the composition frame chart of another kind of set-top box video decoding quality checkout gear in the embodiment of the invention 2;
Fig. 4 is the composition frame chart of another kind of set-top box video decoding quality checkout gear in the embodiment of the invention 2;
Fig. 5 is the composition frame chart of another kind of set-top box video decoding quality checkout gear in the embodiment of the invention 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1
The method that the present embodiment provides a kind of set-top box video decoding quality to detect, as shown in Figure 1, the method comprises:
101, First Characteristic information is embedded in the original video sequence of un-encoded and obtains characteristic sequence, and record the embedded location of described First Characteristic information in described characteristic sequence.
Wherein, described First Characteristic information is image segments, described image segments be have each width of cloth image of sign in described original video sequence order and identify a kind of in the function of the top of each the width of cloth image/order of field, the end in described original video sequence, its can separate, stored in the characteristic pattern valut; The original video sequence of described un-encoded also can separate, stored in the original video sequence storehouse, the embodiment of the invention is not done restriction to this, the user can specifically arrange according to demand.
102, described characteristic sequence is encoded obtain video code flow, and described video code flow is sent to set-top box, obtain analog video signal so that described set-top box is decoded to described video code flow.
Wherein, described characteristic sequence encoded obtains video code flow, can according to but be not limited to following methods and realize, the method comprises:
Coding parameter according to frame/field in the type of described characteristic sequence and the described characteristic sequence, determine the coding mode of described characteristic sequence, described coding mode is frame coding, a coding, MBAFF (Marco-Adaptive Field Frame, the macro-block level frame field adaptive) a kind of in coding, PAFF (Picture Adaptive Field Frame, the image level frame field adaptive) coding; Adopt described definite coding mode and based on encryption algorithm H.264, described characteristic sequence is encoded obtains corresponding video code flow.
For example, as shown in table 1 for the method that coding mode is confirmed, wherein, the combination of " √ " sign need to verify, the combination of " * " sign can not verified.If the original video sequence Source Type is sequence line by line, then can select the frame coding that it is encoded, and a coding, MBAFF coding and PAFF coding are not optional.
Table 1
Wherein, described video code flow is sent to set-top box, can according to but be not limited to following methods and realize, the method comprises: the form by the protocol IP network using multicast between the network sends to described set-top box with described video code flow.
103, receive the video file that comprises described analog video signal of capture card collection, described video file decoded obtains decoded video sequence, and described video file is that described capture card receives the video file that the described analog video signal of described set-top box output forms.
Need to prove, capture card claims again capure card, can be used for gathering analogue video signal, and described analogue video signal is stored in the computer.
104, according to described embedded location described decoded video sequence is carried out feature extraction, obtain Second Characteristic information.
Wherein, described Second Characteristic information is image segments, described image segments be have each width of cloth image of sign in described original video sequence order and identify a kind of in the function of the top of each the width of cloth image/order of field, the end in described original video sequence.
105, described First Characteristic information and described Second Characteristic information are compared, and comparative result is exported.
Further, in order to improve the accuracy of set-top box quality-monitoring, can also when being unusual, analyze described unusual comparative result at described comparative result, determine the actual corresponding type of error of described unusual comparative result.For example, the conclusion that compared result is analyzed, as shown in table 2, if described unusual comparative result is that picture numbers is discontinuous, the type that then can determine error of set-top box is missing image, is felt as motion for people's supervisor discontinuous.
| Sequence number | The result detects unusually | The error of set-top box type | Subjective feeling |
| 1 | Picture numbers is discontinuous | Missing image | Move discontinuous |
| 2 | Picture numbers is put upside down | Image is out of order | Flating |
| 3 | Picture numbers repeats | Image repeats | Move discontinuous |
| 4 | Field, top/end sequence number is inconsistent | The top/or end field picture lose | Flating |
| 5 | Put upside down field, the top/end | Top/end field picture is put upside down | Flating |
| 6 | Repeat field, the top/end | Top/end field picture repeats | Move discontinuous |
Table 2
In addition, need to prove, when the comparative result appearance of described First Characteristic information and described Second Characteristic information is unusual, then the comparative result of described First Characteristic information and described Second Characteristic information can be exported also and can not export, the embodiment of the invention does not limit this, and the user can specifically arrange according to demand.
The method that the set-top box video decoding quality that the embodiment of the invention provides detects, by in original video sequence, embedding First Characteristic information, gather and the decoded Second Characteristic information of extractor top box, First Characteristic information and Second Characteristic information are compared, come the set-top box of tested person is carried out quality testing, do not need the tester to come the quality of the set-top box of tested person is estimated by sensory information, detect to the set-top box video decoding quality effective objective evaluation is provided; And because test platform provides stable test environment, so that the accuracy that the set-top box video decoding quality detects improves; In sum, because the set-top box video decoding quality detects the raising that effective objective evaluation and set-top box video decoding quality accuracy of detection have been arranged, so that the accuracy that the set-top box video decoding quality detects improves.
And, in the embodiment of the invention, at described comparative result when being unusual, can also realize described unusual comparative result is analyzed, determine the actual corresponding type of error of described unusual comparative result, so that the concrete type of error of set top box decodes can be determined, in order to improve the accuracy of set-top box quality-monitoring.
Embodiment 2
The device that the present embodiment provides a kind of set-top box video decoding quality to detect, as shown in Figure 2, this device comprises: embedded unit 21, record cell 22, coding unit 23, transmitting element 24, receiving element 25, decoding unit 26, extraction unit 27, comparing unit 28, output unit 29.
Embedded unit 21 obtains characteristic sequence for the original video sequence that First Characteristic information is embedded into un-encoded.Wherein, described First Characteristic information is image segments, described image segments be have each width of cloth image of sign in described original video sequence order and identify the function of the top of each the width of cloth image/order of field, the end in described original video sequence.
Transmitting element 24 is used for the described video code flow that described coding unit 23 generates is sent to set-top box, obtains analog video signal so that described set-top box is decoded to described video code flow; Wherein, when described transmitting element 24 sends to set-top box at the described video code flow that described coding unit 23 is generated, can carry out in the following manner, this mode is: by the protocol IP network between the network described video code flow is sent to described set-top box.
Receiving element 25 is for the video file that comprises described analog video signal that receives the capture card collection.
Decoding unit 26, being used for the described video file that described receiving element 25 receives decoded obtains decoded video sequence.
Comparing unit 28 is used for the described Second Characteristic information of described First Characteristic information and the extraction of described extraction unit is compared.
Further, as shown in Figure 3, this coding unit 23 also comprises: determination module 231, coding module 232.
Further, as shown in Figure 4, this installs this and comprises: analytic unit 210.
Further, as shown in Figure 5, this analytic unit 210 also comprises: the first analysis module 2101, the second analysis module 2102, the 3rd analysis module 2103, the 4th analysis module 2104, the 5th analysis module 2105, the 6th analysis module 2106.
The first analysis module 2101, being used at described unusual comparative result is picture numbers when discontinuous, definite described type of error is missing image.
The second analysis module 2102, being used at described unusual comparative result is picture numbers when putting upside down, definite described type of error is that image is out of order.
The 3rd analysis module 2103 is used for when described unusual comparative result is the picture numbers repetition, and definite described type of error is that image repeats.
, being used for being field, top/end sequence number when discontinuous at described unusual comparative result, definite described type of error is lost for top/end field picture.
The 5th analysis module 2105 is used for when described unusual comparative result is put upside down for field, top/end sequence number, and definite described type of error is put upside down for top/end field picture.
The 6th analysis module 2106 is used for when described unusual comparative result repeats for field, top/end sequence number, and definite described type of error repeats for top/end field picture.
Need to prove, described embedded unit 21, record cell 22, coding unit 23, transmitting element 24 are integrated in the encoder of test lead; Described receiving element 25, decoding unit 26, extraction unit 27, comparing unit 28, output unit 29 are integrated in the described set-top box; or be arranged on outside the described set-top box as autonomous device; but the embodiment of the invention does not limit this, and any enforceable compound mode all belongs to the scope of embodiment of the invention protection.
The device that the set-top box video decoding quality that the embodiment of the invention provides detects, by in original video sequence, embedding First Characteristic information, gather and the decoded Second Characteristic information of extractor top box, First Characteristic information and Second Characteristic information are compared, come the set-top box of tested person is carried out quality testing, do not need the tester to come the quality of the set-top box of tested person is estimated by sensory information, detect to the set-top box video decoding quality effective objective evaluation is provided; And because test platform provides stable test environment, so that the accuracy that the set-top box video decoding quality detects improves; In sum, because the set-top box video decoding quality detects the raising that effective objective evaluation and set-top box video decoding quality accuracy of detection have been arranged, so that the accuracy that the set-top box video decoding quality detects improves.
And, in the embodiment of the invention, at described comparative result when being unusual, can also realize described unusual comparative result is analyzed, determine the actual corresponding type of error of described unusual comparative result, so that the concrete type of error of set top box decodes can be determined, in order to improve the accuracy of set-top box quality-monitoring.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better execution mode in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk such as computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (17)
1. a set-top box video decoding quality detection method is characterized in that, comprising:
First Characteristic information is embedded in the original video sequence of un-encoded and obtains characteristic sequence;
Described characteristic sequence encoded obtains video code flow, and described video code flow is sent to set-top box, obtains analog video signal so that described set-top box is decoded to described video code flow;
Receive the video file that comprises described analog video signal of capture card collection, described video file decoded obtains decoded video sequence, and described video file is that described capture card receives the video file that the described analog video signal of described set-top box output forms;
Described decoded video sequence is carried out feature extraction, obtain Second Characteristic information;
Described First Characteristic information and described Second Characteristic information are compared, and comparative result is exported.
2. set-top box video decoding quality detection method according to claim 1 is characterized in that, obtain characteristic sequence in the described original video sequence First Characteristic information being embedded into un-encoded after, comprising:
Record the embedded location of described First Characteristic information in described characteristic sequence.
3. the method that detects of set-top box video decoding quality according to claim 2 is characterized in that, described described analog video signal is carried out feature extraction, obtains Second Characteristic information, comprising:
According to described embedded location described decoded video sequence is carried out feature extraction, obtain Second Characteristic information.
4. set-top box video decoding quality detection method according to claim 1 is characterized in that, comprising:
Described First Characteristic information and described Second Characteristic information are image segments, described image segments be have each width of cloth image of sign in described original video sequence order or identify a kind of in the function of the top of each the width of cloth image/order of field, the end in described original video sequence.
5. set-top box video decoding quality detection method according to claim 1 is characterized in that, described described characteristic sequence is encoded obtains video code flow and comprise:
According to the coding parameter of frame/field in the type of described characteristic sequence and the described characteristic sequence, determine the coding mode of described characteristic sequence;
Adopt described definite coding mode and based on video coding algorithm, described characteristic sequence is encoded obtains corresponding video code flow.
6. set-top box video decoding quality method of testing according to claim 5 is characterized in that, described coding mode is a kind of in frame coding, a coding, macro-block level frame field adaptive MBAFF coding, the image level frame field adaptive PAFF coding; Described video coding algorithm is encryption algorithm H.264.
7. set-top box quality monitoring method according to claim 1 is characterized in that, after with described comparative result output, also comprises:
If described comparative result is unusual, then described unusual comparative result is analyzed, determine the actual corresponding type of error of described unusual comparative result.
8. set-top box quality determining method according to claim 7 is characterized in that, if described comparative result is unusual, then described unusual comparative result is analyzed, and determines the actual corresponding type of error of described unusual comparative result, comprising:
If described unusual comparative result is that picture numbers is discontinuous, the described type of error of then determining is missing image;
Put upside down if described unusual comparative result is picture numbers, the described type of error of then determining is that image is out of order;
Repeat if described unusual comparative result is picture numbers, the described type of error of then determining is that image repeats;
If described unusual comparative result is discontinuous for field, top/end sequence number, the described type of error of then determining is lost for top/end field picture;
If described unusual comparative result is put upside down for field, top/end sequence number, the described type of error of then determining is put upside down for top/end field picture;
If described unusual comparative result repeats for field, top/end sequence number, the described type of error of then determining repeats for top/end field picture.
9. a set-top box video decoding quality checkout gear is characterized in that, comprising:
Embedded unit obtains characteristic sequence for the original video sequence that First Characteristic information is embedded into un-encoded;
Coding unit, the described characteristic sequence that described embedded unit is generated is encoded and is obtained video code flow;
Transmitting element is used for the described video code flow that described coding unit generates is sent to set-top box, obtains analog video signal so that described set-top box is decoded to described video code flow;
Receiving element is for the video file that comprises described analog video signal that receives the capture card collection;
Decoding unit, being used for the described video file that described receiving element receives decoded obtains decoded video sequence;
Extraction unit is used for that the decoded video sequence that described decoding unit decodes generates is carried out feature extraction and obtains Second Characteristic information;
Comparing unit is used for the described Second Characteristic information of described First Characteristic information and the extraction of described extraction unit is compared;
Output unit, the result who compares for the described Second Characteristic information with described First Characteristic information and the extraction of described extraction unit exports.
10. set-top box video decoding quality checkout gear according to claim 9 is characterized in that, this device also comprises:
Record cell is used for recording described First Characteristic information at the embedded location of the described characteristic sequence of described embedded unit generation.
11. set-top box video decoding quality checkout gear according to claim 10 is characterized in that, described extraction unit is used for:
Described embedded location according to described recording unit records carries out feature extraction to described decoded video sequence, obtains Second Characteristic information.
12. the device that set-top box video decoding quality according to claim 9 detects is characterized in that, comprising:
Described First Characteristic information and described Second Characteristic information are image segments, described image segments be have each width of cloth image of sign in described original video sequence order or identify a kind of in the function of the top of each the width of cloth image/order of field, the end in described original video sequence.
13. the device that set-top box video decoding quality according to claim 9 detects is characterized in that, described coding unit comprises:
Determination module is used for according to the type of described characteristic sequence and the coding parameter of described characteristic sequence frame/field, determines the coding mode of described characteristic sequence.
Coding module is used for adopting coding mode that described determination module determines and based on video coding algorithm, and described characteristic sequence is encoded obtains corresponding video code flow.
14. set-top box video decoding quality device according to claim 13 is characterized in that, described coding mode is a kind of in frame coding, a coding, macro-block level frame field adaptive MBAFF coding, the image level frame field adaptive PAFF coding; Described Video coding mode is encryption algorithm H.264.
15. the device of set-top box quality-monitoring according to claim 9 is characterized in that, also comprises:
Analytic unit is used for, described unusual comparative result being analyzed when being unusual at described comparative result, determines the actual corresponding type of error of described unusual comparative result.
16. the device of set-top box quality-monitoring according to claim 9 is characterized in that, described analytic unit comprises:
The first analysis module, being used at described unusual comparative result is picture numbers when discontinuous, definite described type of error is missing image;
The second analysis module, being used at described unusual comparative result is picture numbers when putting upside down, definite described type of error is that image is out of order;
The 3rd analysis module is used for when described unusual comparative result is the picture numbers repetition, and definite described type of error is that image repeats;
The 4th analysis module is used for being field, top/end sequence number when discontinuous at described unusual comparative result that definite described type of error is lost for top/end field picture;
The 5th analysis module is used for when described unusual comparative result is put upside down for field, top/end sequence number, and definite described type of error is put upside down for top/end field picture;
The 6th analysis module is used for when described unusual comparative result repeats for field, top/end sequence number, and definite described type of error repeats for top/end field picture.
17. according to claim 9 or the device that detects of 10 described set-top box video decoding qualities, it is characterized in that, also comprise:
Described embedded unit, record cell, coding unit, transmitting element are integrated in the encoder of test lead;
Described receiving element, decoding unit, extraction unit, comparing unit, output unit are integrated in the described set-top box, or are arranged on outside the described set-top box as autonomous device.
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