CN104703030A - Image coding method and image coding device - Google Patents

Image coding method and image coding device Download PDF

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Publication number
CN104703030A
CN104703030A CN201310671494.1A CN201310671494A CN104703030A CN 104703030 A CN104703030 A CN 104703030A CN 201310671494 A CN201310671494 A CN 201310671494A CN 104703030 A CN104703030 A CN 104703030A
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image
user
image coding
encoding rate
coding device
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CN104703030B (en
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王鸿智
邱利昌
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Ali Corp
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Ali Corp
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Abstract

Disclosed are an image coding method and an image coding device. The image coding method includes the following steps: collecting multiple frames enough for performing an H.264 coding mechanism in a buffer; dynamically switching coding rate of the H.264 coding mechanism according to at least one of using condition of the image coding device by a user and operating condition of an application program; adopting the H.264 coding mechanism corresponding to the coding rate to code the frames.

Description

Video encoding method and image coding device
Technical field
The invention relates to a kind of coding method and code device, and relate to a kind of video encoding method and image coding device especially.
Background technology
Along with the development of science and technology and the evolution in epoch, the amusement function that people provide for electronic product is more and more focused on.Therefore, Ge Jia manufacturer falls over each other the digital entertainment product releasing various novelty invariably, to attract the attention of consumers.The picture watched on the mobile device can be projected to the display had compared with large-screen to allow user, develop the external device (ED) that one has screen mirror (Mirracast) function now, it can after being connected with mobile device, the image sent according to mobile device and control display (such as TV) the display picture identical with mobile device accordingly.
In general, when mobile device is when adopting encoding mechanism H.264 to deliver to the image of described external device (ED) to tendency to develop of encoding, its image coding quality is just no longer changed after decision, and the image quality thus making mobile device be sent to described external device (ED) is fixing.More specifically, namely the encoding rate that mobile device carries out H.264 encoding mechanism according to this determines before substantially encoding, and cannot at random change.Therefore, in some cases, operating mechanism so may make user be exposed to not good operating experience.
For example, when user is when editing the application program on mobile device, usually wish that display more immediately can reflect the various editor that user carries out on the mobile device or operation behavior, and compared with taking notice of the image quality of picture shown by display.In the case, if mobile device still adopt correspond to compared with the H.264 encoding mechanism of high code-rate encode for send (or sharing) to the image of external device (ED) time, mobile device and external device (ED) may be made when providing screen mirror function to occur the situation postponed, and then cause user to be exposed to not good user's experience.More specifically, when mobile device adopts high code-rate, the picture shown by display possibly will immediately cannot reflect the operation that user carries out on the mobile device.
Lift another example, when user for view and admire mobile device over the display and play film time, usually wish the film that can watch compared with high image quality, and compared with the small delays situation occurred when can not take notice of movie.In the case, if mobile device still adopts correspond to the H.264 encoding mechanism of lower encoding rate when encoding for being sent to the image of external device (ED), user may be made to be exposed to not good user to experience because the film of high image quality cannot be watched.
Summary of the invention
In view of this, the invention provides a kind of video encoding method and image coding device, it can adjust encoding rate according to user to the operation situation of application program in the use situation of image coding device or running adaptively, and then provides user preferably user's experience.
The invention provides a kind of video encoding method, be suitable for image coding device.Described method comprises the following steps: to collect in a buffer the multiple frames being enough to carry out H.264 encoding mechanism; According to user to the use situation of image coding device and the operation situation of application program at least one of them and dynamically switch the encoding rate of H.264 encoding mechanism; Adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.
In one embodiment of this invention, after the step adopting the H.264 described multiple frame of encoding mechanism coding, more comprise: the described multiple frame after coding is carried out multiplex (MUX) with corresponding message part and processes to produce transmission stream; Transmission stream is sent to image-decoding device, with the display frame of shared image code device to image-decoding device by direct line.
In one embodiment of this invention, according to user to the use situation of image coding device and the operation situation of application program at least one of them and the step that dynamically adjusts the encoding rate of H.264 encoding mechanism comprises: user by the User's Interface unit adjustment of image coding device for adjusting the object of encoding rate time, the adjustment result presented according to object switches encoding rate.
In one embodiment of this invention, described application program is the superiors' application program, and according to user to the use situation of image coding device and the operation situation of application program at least one of them and the step that dynamically adjusts the encoding rate of H.264 encoding mechanism comprises: judge that whether user is just in editing application program; If so, encoding rate is reduced.
In one embodiment of this invention, described application program is the superiors' application program, and judging user whether just after the step of editing application program, more comprise: if user is not just in editing application program, judge the whether idle or static Preset Time of image coding device; If so, encoding rate is increased.
In one embodiment of this invention, described application program is the superiors' application program, and according to user to the use situation of image coding device and the operation situation of application program at least one of them and the step that dynamically adjusts the encoding rate of H.264 encoding mechanism comprises: judge whether the diversity factor between present frame shown by application program and previous frame is greater than preset value; If so, encoding rate is reduced; If not, encoding rate is maintained.
The invention provides a kind of image coding device, it comprises buffer and image process unit.Image process unit couples buffer, is configured to perform the following step: collect the multiple frames being enough to carry out H.264 encoding mechanism in a buffer; According to user to the use situation of image coding device and the operation situation of application program at least one of them and dynamically switch the encoding rate of H.264 encoding mechanism; Adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.
In one embodiment of this invention, described image coding device more comprises the communication unit being connected to image process unit, and image process unit is more configured to: the described multiple frame after coding is carried out multiplex (MUX) with corresponding message part and processes to produce transmission stream; Communication control unit sends transmission stream to image-decoding device, with the display frame of shared image code device to image-decoding device by direct line.
In one embodiment of this invention, described image coding device more comprises the User's Interface unit being connected to image process unit, wherein when user adjusts the object for adjusting encoding rate by the User's Interface unit of image coding device, the adjustment result that image process unit presents according to object switches encoding rate.
In one embodiment of this invention, described application program is the superiors' application program, and image process unit judges that whether user is just in editing application program; If so, image process unit reduces encoding rate.
In one embodiment of this invention, described application program is the superiors' application program, and if user not just in editing application program, image process unit is more configured to judge the whether idle or static Preset Time of image coding device; If so, image process unit increases encoding rate.
In one embodiment of this invention, whether the present frame shown by image process unit judgement and the diversity factor between previous frame are greater than preset value; If so, image process unit reduces encoding rate; If not, image process unit maintains encoding rate.
Based on above-mentioned, the video encoding method that the embodiment of the present invention proposes and image coding device can adjust encoding rate according to user for the operational scenario of image coding device adaptively, and then provide user preferably user's experience.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the image coding device that foundation one embodiment of the invention illustrate.
Fig. 2 is the video encoding method flow chart illustrated according to one embodiment of the invention.
Fig. 3 is the video encoding method flow chart illustrated according to first embodiment of the invention.
Fig. 4 is the video encoding method flow chart illustrated according to second embodiment of the invention.
[symbol description]
100: image coding device
110: buffer
120: image process unit
130: communication unit
140: User's Interface unit
S210 ~ S250, S310 ~ S360, S410 ~ S450: step
Embodiment
Fig. 1 is the functional block diagram of the image coding device that foundation one embodiment of the invention illustrate.In the present embodiment, image coding device 100 comprises buffer 110 and image process unit 120.Image coding device 100 is such as smart mobile phone (Smart Phone), panel computer (Tablet), notebook computer, personal digital assistant or other any by Radio Transmission Technology by display frame transmission or share to other image-decoding devices (be such as Set Top Box (Set-Top Box, STB)), to reach the electronic installation of screen mirror (Mirracast) function.Described Radio Transmission Technology is such as the direct line of wireless fidelity (Wireless Fidelity direct, Wi-Fi direct), but embodiment of the present invention is not limited thereto.Buffer 110 is such as the mediums such as memory, and it can store the multiple frames (frame) being associated with picture shown by mirror image coding device 100.
Image process unit 120 is coupled to buffer 110.Image process unit 120 can be graphics processing unit (Graphics Processing Unit, GPU), general service processor, special purpose processors, traditional processor, digital signal processor, multi-microprocessor (microprocessor), the microprocessor of one or more combined digital signal processor core, controller, microcontroller, Application Specific Integrated Circuit (ApplicationSpecific Integrated Circuit, ASIC), field programmable gate array (Field Programmable GateArray, FPGA), the integrated circuit of any other kind, state machine, based on advanced reduced instruction set machine (AdvancedRISC Machine, ARM) processor and similar product.
Can provide user better operating experience when carrying out screen mirror in order to allow image coding device 100 and image-decoding device, the embodiment of the present invention proposes a kind of video encoding method, it can adjust encoding rate according to user for the operational scenario of image coding device 100 adaptively, and details are as follows for its details.
Fig. 2 is the video encoding method flow chart illustrated according to one embodiment of the invention.The method that the present embodiment proposes can be performed by the image coding device 100 of Fig. 1, and each element of the Fig. 1 that namely arranges in pairs or groups below is to illustrate the step details of this method.
In step S210, image process unit 120 can collect the multiple frames (that is, image) being enough to carry out H.264 encoding mechanism in buffer 110.Then, in step S220, image process unit 120 can according to user to the use situation of image coding device 100 and the operation situation of application program at least one of them and dynamically adjust the encoding rate of H.264 encoding mechanism.
In one embodiment, image coding device 130 more can comprise the User's Interface unit 140 being connected to image process unit 120.In this embodiment, image coding device 100 can at its User's Interface unit 140(such as Touch Screen) upper display can allow user adjust the object of encoding rate.Described object is such as spool (ScrollBar) or button screen, but embodiment of the present invention is not limited thereto.When described object is spool, user adjusts encoding rate when image process unit 120 carries out H.264 encoding mechanism by dragging the mode of spool.When described object is button screen, image coding device 100 can show the corresponding different coding rate of multiple difference or the button of image quality on its User's Interface unit, chooses wanted image quality voluntarily in order to allow user.
Then, the adjustment result that image process unit 120 can present according to described object switches encoding rate.For example, when described object be realize with button screen, when user chooses the button screen of such as high image quality, encoding rate can be switched to the encoding rate (being such as 768kbps) of corresponding so far button screen by image process unit 120.
Then, in step S230, image process unit 120 can adopt the described multiple frame of H.264 encoding mechanism coding corresponding to described encoding rate.Thus, user can manually adjust the encoding rate of image coding unit 120 for coded frame according to it to the demand of image quality voluntarily, and then avoids user to be exposed to previously mentioned various not good user experience.
In other embodiments, image coding device 100 more can comprise the communication unit 130 being coupled to image process unit 120.Communication unit 130 can set up direct line (being such as the direct line of Wi-Fi) with the image-decoding device such as such as Set Top Box, and the frame of image process unit 120 being encoded by this direct line or other relevant image information transfer to described image-decoding device.
When image-decoding device 100 has communication unit 130, after step S230, image process unit 120 more can perform step S240 and process to produce transmission stream (Transport Stream, TS) so that the described multiple frame after coding is carried out multiplex (MUX) with corresponding message part.
Then, in step s 250, image process unit 120 can control communication unit 130 and send transmission stream to image-decoding device, with the display frame of shared image code device to image-decoding device by direct line.Afterwards, the display unit (such as liquid crystal display) that comprises by self of image-decoding device or display unit (such as liquid crystal display) the show image code device 100 controlling other display frame of sharing.
In other embodiments, video encoding method of the present invention also can adopt other mode to realize, and will enumerate two kinds of ways wherein below, but embodiment of the present invention is not limited thereto.
Fig. 3 is the video encoding method flow chart illustrated according to first embodiment of the invention.The method that the present embodiment proposes can be performed by the image coding device 100 of Fig. 1, and each element of the Fig. 1 that namely arranges in pairs or groups below is to illustrate the step details of this method.
In step S310, image process unit 120 can collect the multiple frames being enough to carry out H.264 encoding mechanism in buffer 110.Then, in step s 320, image process unit 120 can judge that whether user is just in editing application program.Described application program is such as the superiors (On-top) application program, that is to be presented at/the application program of the superiors.If so, image process unit 120 can continue and carry out step S330 to reduce encoding rate.Then, image process unit 120 can carry out step S340 to adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.
In other words, when editing (or operation) application program when image coding device 100 detects user, image process unit 120 reduces encoding rate with may correspond to, with avoid image coding device 100 share display frame over the display and occur that the situation immediately cannot responding user's operation behavior occurs.
On the other hand, if image process unit 120 judges user not just in editing application program, then image process unit 120 can continue and carry out step S350 to judge whether image coding device 100 has left unused or static Preset Time.That is, image process unit 120 can judge user whether for some time (being such as described Preset Time) do not operate image coding device 100, or whether image coding device 100 is not all moved in described Preset Time.In one embodiment, the sensing signal that image process unit 120 can provide according to the such as transducer (not illustrating) such as gravity sensor (G-sensor) and gyroscope (gyroscope) is to carry out the judgement behavior in step S350, but embodiment of the present invention is not limited thereto.Described Preset Time is such as 20 seconds or other are by the value of designer's sets itself of image coding device 100.
If not, image process unit 120 can return step S320; If so, then image process unit can carry out step S360 to increase encoding rate, and then carries out step S340 to adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.Its reason is, when user watch image coding device 100 share to the film of display or image (such as transparency) time, image coding device 100 may be statically placed in somewhere by user for a long time.Now, image process unit 120 can increase encoding rate adaptively, can watch display frame compared with high image quality to allow user.
Fig. 4 is the video encoding method flow chart illustrated according to second embodiment of the invention.The method that the present embodiment proposes can be performed by the image coding device 100 of Fig. 1, and each element of the Fig. 1 that namely arranges in pairs or groups below is to illustrate the step details of this method.
In step S410, image process unit 120 can collect the multiple frames being enough to carry out H.264 encoding mechanism in buffer 110.Then, in the step s 420, image process unit 120 can judge whether the diversity factor between shown present frame and previous frame is greater than preset value (being such as 5%).Described present frame is such as the picture that described application program shows at present, and described previous frame is such as the previous display frame of described present frame.In other embodiments, described previous frame can also be that other be previously stored in the frame in buffer 110, but embodiment of the present invention is not limited thereto.
If described diversity factor is greater than preset value, then image process unit 120 can carry out step S430 to reduce encoding rate.Afterwards, image process unit 120 can carry out step S440 to adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.Its reason is, when described diversity factor is greater than preset value, the similarity represented between present frame and previous frame is lower, if now image process unit 120 still adopts the words compared with high code-rate, the longer processing time will be needed, and then there is the situation of delay in the display frame that image coding device 100 may be caused to share.Therefore, image process unit 120 in time can reduce encoding rate in described diversity factor higher than during preset value, to reduce image process unit 120 for the time of encoding and transmit, and then avoids occurring aforesaid delay situation.
On the other hand, if described diversity factor is not more than preset value, then image process unit 120 can carry out step S450 to maintain encoding rate.Afterwards, image process unit 120 can carry out step S440 to adopt the described multiple frame of H.264 encoding mechanism coding corresponding to encoding rate.Its reason is, between present frame and previous frame, similarity is higher, image process unit 120 encode after data quantity relatively less, even if therefore maintain encoding rate also can not cause aforesaid delay situation.In addition, in other embodiments, if described diversity factor is not more than preset value, then image process unit 120 also can increase the image quality that encoding rate improves shared display frame further.
In sum, the video encoding method that the embodiment of the present invention proposes and image coding device, it can adjust encoding rate according to user for the operational scenario of image coding device 100 adaptively.Thus, when user is when operating image coding device, image coding device in time can turn down encoding rate, with allow its display frame of sharing to display immediately can reflect the various editor of user on image coding device or operation behavior.In addition, when user is only when viewing and admiring the display frame that image coding device is shared to display, image coding device in time can increase encoding rate, to allow user can watch display frame compared with high image quality, thus can provide user preferably user experience.
In addition, although each method that the present invention proposes is illustrated in multiple figure separated, in other embodiments, described multiple method also can at random combined effect reaching other designers and want.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.

Claims (12)

1. a video encoding method, is suitable for image coding device, it is characterized in that, described method comprises the following steps:
Collect in a buffer and be enough to the multiple frames carrying out H.264 encoding mechanism;
According to user to the use situation of this image coding device and the operation situation of application program at least one of them and dynamically switch the encoding rate of this H.264 encoding mechanism; And
Adopt correspond to this encoding rate this H.264 encoding mechanism to encode those frames.
2. the method for claim 1, is characterized in that, adopt this H.264 encoding mechanism encode those frames step after, more comprise:
Those frames after coding are carried out multiplex (MUX) with corresponding message part and processes to produce transmission stream; And
This transmission stream is sent to image-decoding device, to share the display frame of this image coding device to this image-decoding device by wireless direct line.
3. the method for claim 1, it is characterized in that, according to this user, at least one of them and the step dynamically adjusting this H.264 this encoding rate of encoding mechanism of this use situation of this image coding device and this operation situation of this application program are comprised:
When this user adjusts the object for adjusting this encoding rate by the User's Interface unit of this image coding device, the adjustment result presented according to this object switches this encoding rate.
4. the method for claim 1, it is characterized in that, according to this user, at least one of them and the step dynamically adjusting this H.264 this encoding rate of encoding mechanism of this use situation of this image coding device and this operation situation of this application program are comprised:
Judge whether this user is editing this application program;
If so, this encoding rate is reduced.
5. method as claimed in claim 4, is characterized in that, after judging whether this user is editing the step of this application program, more comprise:
If this user is not editing this application program, judging whether this image coding device has left unused or static Preset Time;
If so, this encoding rate is increased.
6. the method for claim 1, it is characterized in that, according to this user, at least one of them and the step dynamically adjusting this H.264 this encoding rate of encoding mechanism of this use situation of this image coding device and this operation situation of this application program are comprised:
Judge whether the diversity factor between present frame shown by this application program and previous frame is greater than preset value;
If so, this encoding rate is reduced; And
If not, this encoding rate is maintained.
7. an image coding device, is characterized in that, comprising:
Buffer; And
Image process unit, couples this buffer, is configured to perform the following step:
Collect in this buffer and be enough to the multiple frames carrying out H.264 encoding mechanism;
According to user to the use situation of this image coding device and the operation situation of application program at least one of them and dynamically switch the encoding rate of this H.264 encoding mechanism; And
Adopt correspond to this encoding rate this H.264 encoding mechanism to encode those frames.
8. image coding device as claimed in claim 7, it is characterized in that, more comprise the communication unit being connected to this image process unit, and this image process unit is more configured to:
Those frames after coding are carried out multiplex (MUX) with corresponding message part and processes to produce transmission stream; And
Control this communication unit and send this transmission stream to image-decoding device by direct line, to share the display frame of this image coding device to this image-decoding device.
9. image coding device as claimed in claim 7, it is characterized in that, more comprise the User's Interface unit being connected to this image process unit, wherein when this user adjusts the object for adjusting this encoding rate by this User's Interface unit of this image coding device, the adjustment result that this image process unit presents according to this object switches this encoding rate.
10. image coding device as claimed in claim 7, it is characterized in that, this image process unit judges whether this user is editing this application program;
If so, this image process unit reduces this encoding rate.
11. image coding devices as claimed in claim 10, is characterized in that, if this user is not editing this application program, this image process unit is more configured to judge whether this image coding device has left unused or static Preset Time;
If so, this image process unit increases this encoding rate.
12. image coding devices as claimed in claim 7, is characterized in that, whether the present frame shown by this image process unit judges and the diversity factor between previous frame are greater than preset value;
If so, this image process unit reduces this encoding rate; And
If not, this image process unit maintains this encoding rate.
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