CN103517072A - Video communication method and video communication equipment - Google Patents
Video communication method and video communication equipment Download PDFInfo
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Abstract
The invention discloses a video communication method and video communication equipment. The method comprises the steps of extracting a feature region from an image, encoding the feature region by a first encoding method and sending the encoded feature region to a receiving end. Therefore, the definition of the feature region can be greatly improved. As only the feature region is transmitted and the difference between frames of the image is small, the code rate generated after encoding is greatly reduced even if a camera shakes with great amplitude or the background environment is complex. Thus, the definition of the feature region with which users are more concerned in video communication can be greatly improved, thereby improving the user experience.
Description
Technical field
The present invention relates to communication technical field, more specifically, the present invention relates to a kind of video communication method and equipment.
Background technology
Development along with computer technology and network technology, in recent years, electronic equipment such as notebook, panel computer (PAD), mobile phone, PDA(Personal Digital Assistant) is universal all the more, and increasing user brings into use the image capture device such as camera and the related application on these electronic equipments, equipped to carry out the video communication applications such as Video chat, video conference.
At present, the intuitional and experiential thinking that video communication applications is brought for user is the sound that can allow the other user see our user's video on the electronic equipment of opposite end and hear our user, and wherein our user video is that the video data that directly catches from the camera local terminal electronic equipment is after coding, be transferred on the electronic equipment of opposite end through network.
For example, due in traditional video communication applications, normally directly (catch certain fixed resolution size by camera, 176 * 144) video data, then through Video coding, realize to the coding of entire image and by the entire image after coding and directly send to opposite end electronic equipment, so often comprised the background image of a lot of complexity in a two field picture.
Like this, in the situation that camera rocks because a variety of causes produces, or the in the situation that of background environment more complicated, the video data producing after coding often has very large code check.And this video data with very large code check in the communication channel of Bandwidth-Constrained (such as, in the situation that use the communication pattern of circuit switching (CS)) will produce error while transmitting.
At this moment, in order to meet the restriction of Internet Transmission to code check, just have to adopt frame losing to process and reduce the processing of frame per second when coding.Yet, in the time of can causing like this video image to show, produce discontinuity and mosaic on the electronic equipment of opposite end, thereby greatly reduce the image definition in video communication, finally cannot effectively give prominence to a certain characteristic area that in entire image the other user is often more concerned about (such as, our user's face).
Thereby, need a kind of novel video communication method and equipment to solve the problems referred to above.
Summary of the invention
In order to solve the problems of the technologies described above, according to an aspect of the present invention, provide a kind of video communication method, it is characterized in that, described method comprises: from image, extract characteristic area; With the first coding method, described characteristic area is encoded; And send the described characteristic area after coding to receiving terminal.
In addition, according to a further aspect in the invention, provide a kind of apparatus for video communication, it is characterized in that, described equipment comprises: extraction element, for extracting characteristic area from image; The first code device, for encoding to described characteristic area with the first coding method; And dispensing device, for sending the described characteristic area after coding to receiving terminal.
Compared with prior art, employing is according to video communication method of the present invention and equipment, in video communication process, can be in local terminal electronic equipment, utilize characteristic area detection technique to extract characteristic area in the video image of each frame, utilize the coding method corresponding with characteristic area to encode to this characteristic area, and to opposite end electronic equipment, transmit the video data after the coding that only comprises characteristic area, make after decode operation, the other user can watch the characteristic area of being only concerned about in the electronic equipment of opposite end.Therefore, in the present invention, can greatly improve the definition of characteristic area, even rock larger in the situation that at camera, or the in the situation that of background environment more complicated, due to a transmission feature region, difference between every frame of image is less, so the code check producing after coding also can reduce greatly, can greatly improve the definition of the characteristic area that in video communication, user is concerned about more like this, thereby improve user's experience.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in specification, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 illustrates according to video communication method of the present invention.
Fig. 2 illustrates according to apparatus for video communication of the present invention.
Fig. 3 illustrates the video communication method according to first embodiment of the invention.
Fig. 4 illustrates the video communication system according to first embodiment of the invention.
Fig. 5 illustrates the video communication method according to second embodiment of the invention.
Fig. 6 illustrates the video communication system according to second embodiment of the invention.
Embodiment
Describe in detail with reference to the accompanying drawings according to each embodiment of the present invention.Here, it should be noted that in the accompanying drawings, identical Reference numeral is given and substantially had part identical or similar structures and function, and will omit being repeated in this description about them.
Hereinafter, with reference to Fig. 1 and Fig. 2, describe according to video communication method of the present invention and equipment.
Fig. 1 illustrates according to video communication method of the present invention, and Fig. 2 illustrates according to apparatus for video communication of the present invention.
The illustrated video communication method of Fig. 1 is realized by the illustrated apparatus for video communication of Fig. 2.Particularly, described apparatus for video communication 100 comprises: extraction element 110, the first code device 120 and dispensing device 130.
As illustrated in figure 1, described electronic equipment method for customizing comprises:
In step S110, extraction element 110 extracts characteristic area from image;
In step S120, first code device 120 use the first coding methods are encoded to described characteristic area; And
In step S130, dispensing device 130 sends the described characteristic area after coding to receiving terminal.
As can be seen here, employing is according to video communication method of the present invention and equipment, in video communication process, can be in local terminal electronic equipment, utilize characteristic area detection technique to extract characteristic area in the video image of each frame, utilize the coding method corresponding with characteristic area to encode to this characteristic area, and to opposite end electronic equipment, transmit the video data after the coding that only comprises characteristic area, make after decode operation, the other user can watch the characteristic area of being only concerned about in the electronic equipment of opposite end.Therefore, in the present invention, can greatly improve the definition of characteristic area, even rock larger in the situation that at camera, or the in the situation that of background environment more complicated, due to a transmission feature region, difference between every frame of image is less, so the code check producing after coding also can reduce greatly, can greatly improve the definition of the characteristic area that in video communication, user is concerned about more like this, thereby improve user's experience.
Hereinafter, with reference to Fig. 3 and Fig. 4, describe according to the video communication method of first embodiment of the invention and video communication system.
Fig. 3 illustrates the video communication method according to first embodiment of the invention, and Fig. 4 illustrates the video communication system according to first embodiment of the invention.
Fig. 3 is illustrated can be applied to the illustrated video communication system 300 of Fig. 4 according to the video communication method of first embodiment of the invention.As illustrated in Fig. 4, this video communication system 300 comprises: local terminal apparatus for video communication 100He opposite end apparatus for video communication 200.This local terminal apparatus for video communication 100Yu Gai opposite end apparatus for video communication 200 by variety of way (such as, cable network and wireless network) and link together, and carry out transmission of video communication data according to the data format of agreement.
At this, the example using mobile phone as local terminal apparatus for video communication 100He opposite end apparatus for video communication 200 describes.Yet, obviously the invention is not restricted to this.Can also apply the present invention in the video communication process between the same types such as notebook, panel computer, personal digital assistant or dissimilar electronic equipment.
This local terminal apparatus for video communication 100 comprises: extraction element 110, the first code device 120, dispensing device 130 and trap setting 140.
This opposite end apparatus for video communication 200 comprises: receiving system 210, the first decoding device 220 and display unit 230.
As illustrated in Fig. 3, according to the video communication method of first embodiment of the invention, comprise:
In step S210, catch video sequence.
Particularly, when our user wants with when its long-range the other user carries out video calling, we user in its local local terminal apparatus for video communication 100(for example can utilize, we user's mobile phone), by the cable network such as 3 G mobile communication network or wireless network, to the other user, initiate video calling request.
Now, in the opposite end of the other user this locality apparatus for video communication 200(similarly, mobile phone for example) to the other user, point out our user to it, to initiate video calling request.After the other user selects to accept call request, between is set up video calling and is connected.
Below, the other side's apparatus for video communication 200 transmission video images held to the other user at the local terminal apparatus for video communication 100 of our user side of take are example, go on to say the video communication method according to first embodiment of the invention.Yet obviously, the other side's apparatus for video communication 200 of the other user's end can transmit video image to the local terminal apparatus for video communication 100 of our user side equally, the processing of now carrying out in both will be exchanged.
For example, setting up after video calling connects, in local terminal apparatus for video communication 100, trap setting 140(for example, the camera on mobile phone) catch our user's video sequence, this video sequence is comprised of a series of picture frame.
Now, trap setting 140 self resolution is set to first resolution.Preferably, this first resolution is the ultimate resolution that this trap setting 140 can be supported.Like this, trap setting 140 adopts maximum resolution to catch a frame video image, to obtain the pair video image of high definition as far as possible, then it sends to extraction element 110 by captured video image, to carry out subsequent treatment.
In step S220, from image, extract characteristic area.
Particularly, after receiving the video image that trap setting 140 catches, extraction element 110 is carried out characteristic area detection algorithm for this video image, to obtain characteristic area in raw video image Zhong position.
Here think, generally speaking, what carry out that the both sides of video communication relatively pay close attention to is user's facial information, therefore, preferably, this characteristic area can be chosen for to user's human face region, and this characteristic area detection algorithm can be that people's face detects and/or Face tracking algorithm.Yet, obviously the invention is not restricted to this.Other regions such as our user's limbs or the display in our subscriber's local can also be chosen for to the characteristic area that the other user is concerned about.
People's face detection algorithm is for detecting and whether to have people's face at input picture, and determines everyone Lian position, size, pose.It is a key technology in the information processing of people's face that people's face detects.According to the color attribute that utilizes feature, people's face detection algorithm can be divided into method and two classes of the method based on gray feature based on features of skin colors.
Face tracking algorithm is often used on basis that people's face detects the tracking for human face in video frequency sequence movement position.Face tracking algorithm comprises based drive method and the method based on model.
It should be noted that, extraction element 110 can adopt any people's face existing or that develop in the future to detect and/or Face tracking algorithm, in the raw video image capturing at trap setting 140, detect human face region, determine the position of this human face region, and extract this human face region from each two field picture.
Now, preferably, extracting human face region from each two field picture when, this extraction element 110 also further monitors that central processing unit (CPU) in local terminal apparatus for video communication 100 detects and/or shared resource during Face tracking algorithm at executor's face, and judge whether the shared system resource of this detection operation is more than or equal to a predetermined resource threshold, for example, 50%.
For example, when this extraction element 110 is when the first two field picture of the video sequence that utilizes ultimate resolution to catch trap setting 140 detects, if the shared system resource of this detection operation exceeds 50% of the whole resource of CPU, this extraction element 110 think that people's face now detects and/or Face tracking algorithm to take the resource of CPU excessive, may affect other application of operation in local terminal apparatus for video communication 100.Therefore, this extraction element 110 sends resolution changing signal to trap setting 140.Described trap setting, according to described resolution changing signal, will be changed into slightly smaller second resolution as the first resolution of ultimate resolution, so that in subsequent operation, adopts second resolution to catch the second two field picture of described video sequence.In this manner, resolution when this extraction element 110 can frame by frame be turned down gradually trap setting 140 and caught video sequence, is less than predetermined resource threshold until this detections operates shared system resource.
In like manner, when user is owing to having exited in local terminal apparatus for video communication 100 other application of operation and cause this detections to operate shared less system resource, resolution when this extraction element 110 also can be heightened trap setting 140 seizure video sequence gradually, make to obtain user's face image more clearly, until this resolution equals ultimate resolution.
By above-mentioned processing, realizing with traditional visual telephone the size that generally resolution of camera is directly set to show compares, the first embodiment of the present invention can be adjusted according to system resource the resolution of camera, thereby obtains a width original facial image as far as possible clearly.
In addition, preferably, human face region detected from original video sequence after, this extraction element 110 can also compare the size of detected human face region and a default dimension threshold, and wherein this dimension threshold depends on the bandwidth of video channel.If the size of detected human face region is less than described dimension threshold, detected human face region is amplified to processing, make the size of detected human face region equal described dimension threshold.This scene usually occurs in our user's portrait apart from camera situation far away.In like manner, if the size of detected human face region is greater than described dimension threshold, detected human face region is dwindled to processing, make the size of detected human face region equal described dimension threshold.This scene occurs in the portrait situation nearer apart from camera.
By above-mentioned processing, realize and comparing with the conventional video phone that does not carry out people's face detection operation, the first embodiment of the present invention can overcome the facial image that may occur and in opposite end apparatus for video communication 200, show excessive or too small situation.
Because trap setting 140 cameras in step S210 are set to ultimate resolution, so in step S220, these extraction element 110 extraction elements 110 can carry out suitable convergent-divergent to detecting the facial image obtaining according to the size of display video coding, thereby make when in the follow-up process that people's face video flowing after convergent-divergent is encoded, guarantee that encoder bit rate meets visual telephone transmission code rate and requires in, guarantee to obtain a highest facial image of definition in the scope of camera blur-free imaging.
Finally, this extraction element 110 sends to the first code device 120 by extracted human face region, to carry out subsequent treatment.
In step S230, with the first coding method, characteristic area is encoded.
Particularly, after receiving the human face region that extraction element 110 extracts, first code device 120 use the first coding methods are encoded to this human face region, to generate the video flowing that will transmit.
For example, this first code device 120 can use various method for video coding (such as, Motion Picture Experts Group (MPEG) 4, H.263, H.264) to encode to extracted human face region.Because the video image that will encode only comprises human face region, the variation of human face region in whole video call process is very little, so frame and the difference between frame at video flowing can be very little, even if also can guarantee very little encoder bit rate rocking very large in the situation that like this.
Then, this first code device 120 is sent to dispensing device 130 by the video image after coding, for subsequent treatment.
In step S240, to receiving terminal, send the characteristic area after coding.
Particularly, after the human face region after receiving coding, dispensing device 130 sends to opposite end apparatus for video communication 200 video flowing that only comprises human face region by for example 3 G mobile communication network.
In step S250, the characteristic area that receives and decode after this coding.
In ， opposite end apparatus for video communication 200, receiving system 210 receives via for example mobile communications network the video flowing that only comprises human face region, and it is sent to the first decoding device 220 particularly.
This first decoding device 220 can be decoded to this video flowing with first coding/decoding method corresponding with the first coding method, to therefrom recover to comprise the image of human face region.
In step S260, indicating characteristic region.
Particularly, after the human face region receiving from this first decoding device 220 coded, the display unit of equipment in display unit 230 opposite end apparatus for video communication 200 (such as, display screen) the upper facial image that shows fixed size, and this facial image is far longer than the general demonstration size 176 * 144 realizing in traditional video communication.Experiment showed, according to the video communication of first embodiment of the invention, realize can reach 176 * 144 * 2, the demonstration size of the even larger order of magnitude.
In addition, because the code check producing in the Video coding of facial image in local terminal apparatus for video communication 100 is very little, so can suitably expand the demonstration of video image in opposite end apparatus for video communication 200.The code check that this operation can produce according to reality regulates.Therefore, in video communication system 300, realized a kind of video communication of high-definition portrait pattern.
As can be seen here, employing is according to the video communication method of first embodiment of the invention and system, can utilize human face detection tech to extract facial image in the video image of each frame, then only facial image is carried out to suitable convergent-divergent, coding, can improve greatly like this definition of facial image.Specifically, even rock larger in the situation that at image, owing to only transmitting facial image, difference between every frame of image is less, so the code check producing after coding also can reduce greatly, thereby can improve significantly the definition of facial image, size and continuity in visual telephone, realize the video communication of high-definition portrait pattern.
Therefore, in the first embodiment of the present invention, can provide in the user interface of electronic equipment the high-definition portrait pattern of this video communication as a kind of additional option, make user not only can carry out video communication by traditional general mode, so that between user, transmission comprises the video data of the various image informations such as people's face and background, thereby recognizes and user-dependent comprehensive information; But also can carry out video communication by high-definition portrait pattern, so that the other user can more clearly observe our user's facial expression etc., thereby realize better talk, experience.
Hereinafter, with reference to Fig. 5 and Fig. 6, describe according to the video communication method of second embodiment of the invention and video communication system.
Fig. 5 illustrates the video communication method according to second embodiment of the invention, and Fig. 6 illustrates the video communication system according to second embodiment of the invention.
Fig. 5 is illustrated can be applied to the illustrated video communication system 300 of Fig. 6 according to the video communication method of second embodiment of the invention.As illustrated in Fig. 6, this video communication system 300 comprises: local terminal apparatus for video communication 100He opposite end apparatus for video communication 200.
This local terminal apparatus for video communication 100 comprises: extraction element 110, the first code device 120, the second code device 150, dispensing device 130 and trap setting 140.
This opposite end apparatus for video communication 200 comprises: receiving system 210, the first decoding device 220, the second decoding device 240 and display unit 230.
As illustrated in Fig. 5, according to the video communication method of second embodiment of the invention, comprise:
In step S310, catch video sequence.
In step S320, from image, extract characteristic area.
In step S330, with the first coding method, characteristic area is encoded, and with the second coding method, non-characteristic area is encoded.
In step S340, to receiving terminal, send the characteristic area after coding.
In step S350, the characteristic area that receives and decode after this coding.
In step S360, indicating characteristic region.
Step S210-S260 in step S310-S360 and the first embodiment is roughly the same, and its difference part is:
In step S320, except extracting characteristic area, extraction element 110 further extracts non-characteristic area from image, and wherein this non-characteristic area is the region except characteristic area, for example, and the background area except human face region.
In step S330, with the same in step S230, first code device 120 use the first coding methods are encoded to this human face region.Yet, meanwhile or concurrently, the second code device 150 use encoder bit rates are less than the second coding method of the first coding method non-characteristic area are encoded, and not only comprise human face region, but also comprise the video flowing that will transmit of background area to generate.
In step S350, with the same in step S250, first decoding device 220 use the first coding/decoding methods are decoded to this human face region.Yet, meanwhile or concurrently, the second decoding device 240 use second coding/decoding method corresponding with the second coding method decoded to non-characteristic area, make in step S360, in opposite end apparatus for video communication 200, in the display unit of equipment, show image, the human face region that definition is high and the definition Di background area that comprises different definition region.
As can be seen here, employing is according to the video communication method of second embodiment of the invention and system, the definition of raising facial image in, utilize the coding method of low encoder bit rate encode and transmit the background image in non-face region, thereby can be in the situation that bandwidth be relatively sufficient, or in the situation that the other user wishes to understand the residing environment of our user, in visual telephone, provide and there is high definition, in the time of large scale and good successional facial image, provide and there is relatively low high definition, small size and general successional background image, thereby having realized more outstanding user experiences.
It should be noted that, although the device by use the first coding/decoding method and the second coding/decoding method is depicted as two coding/decoding devices at this, also can carry out this two kinds of different coding/decoding methods by one and same coding/decoding device.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential hardware platform by means of software and realize, and can certainly all by software or hardware, implement.Understanding based on such, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, disk, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the present invention or embodiment.
Describe each embodiment of the present invention in the above in detail.Yet, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, can carry out various modifications to these embodiment, combination or sub-portfolio, and such modification should fall within the scope of the present invention.
Claims (16)
1. a video communication method, is characterized in that, described method comprises:
From image, extract characteristic area;
With the first coding method, described characteristic area is encoded; And
To receiving terminal, send the described characteristic area after coding.
2. according to the method for claim 1, it is characterized in that, the described step of extracting characteristic area from image comprises:
Catch video sequence;
In each two field picture of described video sequence, detect described characteristic area; And
From described each two field picture, extract described characteristic area.
3. according to the method for claim 2, it is characterized in that, the step of described seizure video sequence comprises:
Adopt first resolution to catch the first two field picture of described video sequence.
4. according to the method for claim 3, it is characterized in that, the described step that detects described characteristic area in each two field picture of described video sequence comprises:
In described the first two field picture, detect described characteristic area;
Judge whether the shared system resource of this detection operation is more than or equal to resource threshold; And
If so, described first resolution is changed into second resolution, so that in subsequent operation, employing second resolution catches the second two field picture of described video sequence,
Wherein, described second resolution is less than described first resolution.
5. according to the method for claim 2, it is characterized in that, the described step of extracting described characteristic area from described each two field picture comprises:
The size of detected characteristic area and dimension threshold are compared;
If the size of detected characteristic area is less than described dimension threshold, detected characteristic area is amplified to processing, make the size of detected characteristic area equal described dimension threshold; And
If the size of detected characteristic area is greater than described dimension threshold, detected characteristic area is dwindled to processing, make the size of detected characteristic area equal described dimension threshold.
6. according to the method for claim 5, it is characterized in that, described dimension threshold depends on the bandwidth of video communication.
7. according to the method for claim 1, it is characterized in that, described method also comprises:
From image, extract the non-characteristic area except characteristic area;
With the second coding method, described non-characteristic area is encoded; And
Together with described characteristic area, to receiving terminal, send the described non-characteristic area after coding,
Wherein, the encoder bit rate of described the second coding method is less than the encoder bit rate of described the first coding method.
8. according to the method for claim 1, it is characterized in that, described characteristic area is to comprise Ren Lian region.
9. an apparatus for video communication, is characterized in that, described equipment comprises:
Extraction element, for extracting characteristic area from image;
The first code device, for encoding to described characteristic area with the first coding method; And
Dispensing device, for sending the described characteristic area after coding to receiving terminal.
10. according to the equipment of claim 9, it is characterized in that, described equipment also comprises:
Trap setting, for catching video sequence, and
Described extraction element detects described characteristic area in each two field picture of described video sequence, and extracts described characteristic area from described each two field picture.
11. according to the equipment of claim 10, it is characterized in that, described trap setting adopts first resolution to catch the first two field picture of described video sequence.
12. according to the equipment of claim 11, it is characterized in that, described extraction element detects described characteristic area in described the first two field picture, judge whether the shared system resource of this detection operation is more than or equal to resource threshold, if, to described trap setting, send resolution changing signal, and
Described trap setting, according to described resolution changing signal, is changed into second resolution by described first resolution, so that in subsequent operation, employing second resolution catches the second two field picture of described video sequence,
Wherein, described second resolution is less than described first resolution.
13. according to the equipment of claim 10, it is characterized in that, described extraction element compares the size of detected characteristic area and dimension threshold, if the size of detected characteristic area is less than described dimension threshold, detected characteristic area is amplified to processing, make the size of detected characteristic area equal described dimension threshold, and if the size of detected characteristic area is greater than described dimension threshold, detected characteristic area is dwindled to processing, make the size of detected characteristic area equal described dimension threshold.
14. according to the equipment of claim 13, it is characterized in that, described dimension threshold depends on the bandwidth of video communication.
15. according to the equipment of claim 9, it is characterized in that, described equipment also comprises the second code device,
Described extraction element is also for extract the non-characteristic area except characteristic area from image,
Described the second code device is used for the second coding method, described non-characteristic area being encoded, and
Described dispensing device, also for together with described characteristic area, sends the described non-characteristic area after coding to receiving terminal,
Wherein, the encoder bit rate of described the second coding method is less than the encoder bit rate of described the first coding method.
16. according to the equipment of claim 9, it is characterized in that, described characteristic area is to comprise Ren Lian region.
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