CN101583027B - Method for caching image data in real time and movable terminal - Google Patents
Method for caching image data in real time and movable terminal Download PDFInfo
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- CN101583027B CN101583027B CN2009102037480A CN200910203748A CN101583027B CN 101583027 B CN101583027 B CN 101583027B CN 2009102037480 A CN2009102037480 A CN 2009102037480A CN 200910203748 A CN200910203748 A CN 200910203748A CN 101583027 B CN101583027 B CN 101583027B
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Abstract
The invention provides a method for caching image data in real time and a movable terminal, comprising an image interface module which is respectively connected with an upper layer application module and an image collecting device, a direct memory access unit and a cache address maintaining unit. The image interface module comprises the direct memory access unit and a cache address register which are connected, as well as an address setting unit and an address obtaining unit which are connected with the upper layer application module; the direct memory access unit is used for memorizing the latest image data collected by the image collecting device into the memory address indicated by the cache address register. The cache address maintaining unit is used for inputting the memory address stored with the image data earliest into the cache address register when all the memory address used for caching the image data are all memorized with the image data. The terminal can ease the phenomenon that the image updating is delayed, maintain the data cached by the image as the latest collected image based on using lower expense, improve the operating factor of the dynamic cache resources of the movable terminal and improve the updating speed of the real-time image of the movable terminal.
Description
Technical field
The present invention relates to the technology of image data transmission in the multimedia terminal, relate in particular to a kind of method and portable terminal of caching image data in real time.
Background technology
Along with advancing by leaps and bounds of the communication technology and computer technology, multimedia service has become the standard configuration of various embedded devices, especially at consumer handheld terminal, as 3G (3rd Generation, the 3G (Third Generation) Moblie technology) mobile phone, MP4, MP5 etc., and generally all dispose other imageing sensor of mega pixel level and be used to obtain image.But because present random access memory RAM (RandomAccess Memory, RAM) cost is still higher, in embedded device, can not be equipped with many memory headrooms for obtaining image, general way is the buffer memory that configuration can be stored several two field pictures, dispatch these buffer memorys by software and hardware combining, after all images buffer memory all has been filled view data, if the untimely release buffer memory of software, will cause follow-up image transmission to finish, and when software need be handled, image in the buffer memory in time may be expired, makes the bigger delay of appearance on the image-watching, directly influences the user and embody.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and portable terminal of caching image data in real time, improves the utilance of mobile terminal dynamic cache memory resource, improves the renewal speed of portable terminal realtime graphic.
In order to address the above problem, the invention provides a kind of portable terminal of caching image data in real time, comprise respectively the image interface module that links to each other with image capture device with upper application module, comprise continuous direct memory access unit and buffer memory address register in the described image interface module, and the address setting unit and the address acquisition unit that link to each other with upper application module; Also comprise the buffer address maintenance unit that links to each other with described address setting unit, described address acquisition unit and described buffer address register respectively;
Described buffer address maintenance unit when all having had view data on being used for the memory address of caching image data, is input to the memory address that deposits view data the earliest in the described buffer address register; Described direct memory access unit is used for the up-to-date image data storage that collects of described image capture device in the indicated memory address of described buffer address register.
Further, above-mentioned portable terminal also has following characteristics:
Described buffer address maintenance unit also is used to safeguard i.e. first formation and second formation of two First Input First Outputs, and first formation is used to place the memory address of not depositing view data, and second formation is used to place the memory address of having deposited view data; Also be used for when the described first formation non-NULL, the memory address of head nodes records in described first formation is input in the described buffer address register, and in described direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described first formation and delete the head node of this memory address of record in described first formation.
Further, above-mentioned portable terminal also has following characteristics:
Described buffer address maintenance unit, also be used for when described first formation is sky, the memory address of head nodes records in described second formation is input in the described buffer address register, and in described direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described second formation and delete the head node of this memory address of record in described second formation.
Further, above-mentioned portable terminal also has following characteristics:
Described address acquisition unit is used for when described upper application module need be obtained view data, sends to described buffer address maintenance unit and triggers message; After also being used to receive the memory address that described buffer address maintenance unit provides, return to described upper application module; Described buffer address maintenance unit also is used for after receiving the triggering message that described address acquisition unit sends, and the memory address of the head nodes records of described second formation is offered described address acquisition unit, and this node is deleted from second formation; Described upper application module is used for obtaining view data from the memory address that described address acquisition unit provides.
Further, above-mentioned portable terminal also has following characteristics:
Described address acquisition unit is used for when described upper application module need be obtained view data, sends to described buffer address maintenance unit and triggers message; After also being used to receive the memory address that described buffer address maintenance unit provides, return to described upper application module; Described buffer address maintenance unit, also be used for after receiving the triggering message that described address acquisition unit sends, to offer described address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, from described second formation, move to preceding M node in described second formation in described first formation successively; M is the integer greater than 1; Described upper application module is used for obtaining view data from the memory address that described address acquisition unit provides.
Further, above-mentioned portable terminal also has following characteristics:
The memory capacity of the memory address of each nodes records is the size of a frame image data in described first formation that described buffer address maintenance unit is safeguarded and second formation.
In order to solve the problems of the technologies described above, the present invention also provides a kind of method of caching image data in real time, comprise: the image capture device of portable terminal is up-to-date collect view data after, when being used for all having had view data on the memory address of caching image data, the direct memory access unit with described up-to-date image data storage in the memory address that deposits view data the earliest in.
Further, said method also has following characteristics:
I.e. first formation and second formation of two First Input First Outputs of buffer address maintenance unit real-time servicing of portable terminal, first formation is used to place the memory address of not depositing view data, and second formation is used to place the memory address of having deposited view data; The image capture device of portable terminal is up-to-date collect view data after, during the described first formation non-NULL, described buffer address maintenance unit is input to the memory address of head nodes records in described first formation in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described first formation and delete the head node of this memory address of record in described first formation; And; The image capture device of portable terminal is up-to-date collect view data after, when described first formation is empty, described buffer address maintenance unit is input to the memory address of head nodes records in described second formation in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described second formation and delete the head node of this memory address of record in described second formation.
Further, said method also has following characteristics:
Upper application module needs when the memory address that is used for caching image data obtains view data, described buffer address maintenance unit offers upper application module with the memory address of the head nodes records of described second formation by address acquisition unit, and this node is deleted from second formation; Described upper application module is obtained view data from the memory address that described address acquisition unit provides.
Further, said method also has following characteristics:
Upper application module needs when the memory address that is used for caching image data obtains view data, described buffer address maintenance unit will offer upper application module by address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, and move to preceding M node in described second formation in described first formation from described second formation successively; M is the integer greater than 1; Described upper application module is obtained view data from the memory address that described address acquisition unit provides.
The present invention can be alleviated the phenomenon that delay appears in image update, and on the basis of using lower expense, the data that keep image buffer storage are the image of gathering recently, alleviates the burden of the process of image reception; Improve the utilance of mobile terminal dynamic cache memory resource, improve the renewal speed of portable terminal realtime graphic.
Description of drawings
Fig. 1 is the composition structure chart of the portable terminal of real-time cache image among the embodiment;
Fig. 2 is the method flow diagram of real-time cache image among the embodiment.
Embodiment
As shown in Figure 1, the portable terminal of caching image data in real time, comprise respectively the image interface module that links to each other with image capture device with upper application module, comprise continuous direct memory access unit and buffer memory address register in the image interface module, and the address setting unit that links to each other with upper application module also comprises the buffer address maintenance unit that links to each other with address setting unit, address acquisition unit and buffer memory address register respectively with address acquisition unit;
Image capture device is generally cam device commonly used, is sent to the image interface module after collecting view data.
Upper application module can be used for the memory address (idle available internal memory location in the system operation) of caching image data for the image interface module assignment; When needs use view data, obtain the memory address that has view data from the image interface module, and from then on obtain view data in the memory address, use to support the user.
The address setting unit notifies the memory address that is used for caching image data that upper application module is distributed to the buffer address maintenance unit;
Address acquisition unit is used for when upper application module need be obtained view data, sends to the buffer address maintenance unit and triggers message; After also being used to receive the memory address that the buffer address maintenance unit provides, return to upper application module.
The buffer address maintenance unit when all having had view data on being used for the memory address of caching image data, is input to the memory address that deposits view data the earliest in the buffer address register.Specifically comprise during realization: safeguard two First Input First Output first formations and second formation, first formation is used to place the memory address of not depositing view data, and second formation is used to place the memory address of having deposited view data.When the first formation non-NULL, the memory address of head nodes records in first formation is input in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of buffer address register indication, add in second formation as the afterbody node this memory address of head nodes records in first formation and delete the head node of this memory address of record in first formation.When first formation is sky, the memory address of head nodes records in second formation is input in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of buffer address register indication, add in second formation as the afterbody node this memory address of head nodes records in second formation and delete the head node of this memory address of record in second formation.After receiving the triggering message that address acquisition unit sends, the memory address of the head nodes records of second formation is offered address acquisition unit, and this node is deleted from second formation; Perhaps; After receiving the triggering message that address acquisition unit sends, to offer address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, from second formation, move to preceding M node in second formation in first formation successively; M is the integer greater than 1.
The buffer address register is used for the memory address of depositing the up-to-date view data that collects that memory buffers address maintenance unit is selected.
Direct memory access unit (Direct Memory Access, be called for short DMA), with the up-to-date image data storage that collects of vision facilities in the indicated memory address of buffer address register.
In order to improve the access speed of view data, the module of respectively forming shown in Figure 1 preferentially uses hardware circuit to realize.Certainly, under the interface function of the image interface module situation that malleable and system handles speed do not allow, also can use software to realize above-mentioned functions.The present invention does not limit this.
Specify the method that adopts portable terminal caching image data in real time shown in Figure 1 below.
The buffer address maintenance unit is safeguarded i.e. first formation and second formation of two formations, these two formations are First Input First Output and (are made of a plurality of nodes, the end of dateout is called head, the end of input data is called afterbody), the buffer address maintenance unit can be provided with the number of bits of read pointer, write pointer, queue depth and each queue element (QE) of formation, and the system address scope that this number of bits can be used as required is set to 16,32 or 64.
What the address setting unit was real-time provides the buffer address that can be used for storing image data to the buffer address maintenance unit, and the buffer address maintenance unit joins these memory addresss that the address setting unit provides in first formation.
As shown in Figure 2, the method for portable terminal caching image data in real time may further comprise the steps:
The up-to-date view data that step 201, image capture device will collect is sent to the image interface module;
Whether first formation that step 202, buffer address maintenance module detect its maintenance is empty; If, execution in step 203; Otherwise, execution in step 204;
Whether second formation that step 203, buffer address maintenance module detect its maintenance is empty, if not, and execution in step 205;
The buffer address maintenance module is under the situation of the first formation non-NULL, after the operation of direct memory access unit completing steps 206, add in second formation as the afterbody node this memory address of head nodes records in first formation and delete the head node of this memory address of record in first formation.
The buffer address maintenance module is under the situation of the empty second formation non-NULL in first formation, after the operation of direct memory access unit completing steps 206, add in second formation as the afterbody node this memory address of head nodes records in second formation and delete the head node of this memory address of record in second formation.
In above-mentioned steps 203, also when empty, the buffer address maintenance unit is made mistakes to upper strata report buffer memory in second formation that the buffer address maintenance module detects its maintenance.
On the basis of the method for above-mentioned caching image data in real time, upper application module needs when the memory address that is used for caching image data obtains view data, the buffer address maintenance unit selects a memory address to notify to the upper strata application module by address acquisition unit from second formation of its maintenance, and upper application module is obtained view data from the memory address that address acquisition unit provides; The mode that the buffer address maintenance unit is selected has following two kinds:
Mode one:
Upper application module needs when the memory address that is used for caching image data obtains view data, the buffer address maintenance unit offers upper application module with the memory address of the head nodes records of second formation by address acquisition unit, and this node is deleted from second formation.When avoiding externally in this buffer address of resume module view data, this buffer address just is being scheduled for the new view data of storage, thus the read-write Problem-Error that causes.
Mode two:
Upper application module needs when the memory address that is used for caching image data obtains view data, the buffer address maintenance unit will offer upper application module by address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, and preceding M node in second formation moved in first formation successively (M for greater than 1 integer) from second formation, upper application module is obtained than the newer view data of view data of the memory address indication of the second formation head node, and increase successive image data available internal memory space.
In the said method, the memory capacity of the memory address of each nodes records is the size of a frame image data in first formation that the buffer address maintenance unit is safeguarded and second formation, and promptly every collection one frame of image capture device carries out buffer memory one time.But this does not influence the present invention and implements in the mode of each storage multiframe.
By said method, can guarantee the freshness (continuity of image and video when using the above buffer memory of three frames can keep portable terminal to take pictures in real time or make a video recording) of the view data that memory address in second formation is indicated; These data are several seconds view data before with regard to what can not preserve because the upper strata is not in time read; Further guarantee that upper application module is used is the up-to-date image that transmits from camera.Said method is during portable terminal is taken pictures in real time or made a video recording during fast moving, and is especially obvious when alleviating the picture lag phenomenon.
Keeping under the constant prerequisite of the existing functions of modules of existing terminal, former terminal is done less change, can realize the present invention.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the portable terminal of a caching image data in real time, comprise respectively the image interface module that links to each other with image capture device with upper application module, comprise continuous direct memory access unit and buffer memory address register in the described image interface module, and the address setting unit and the address acquisition unit that link to each other with upper application module; It is characterized in that, also comprise the buffer address maintenance unit that links to each other with described address setting unit, described address acquisition unit and described buffer address register respectively;
Described buffer address maintenance unit, when on being used for the memory address of caching image data, all having had view data, the memory address that deposits view data the earliest in is input in the described buffer address register, it is described buffer address maintenance unit, be used to safeguard i.e. first formation and second formation of two First Input First Outputs, first formation is used to place the memory address of not depositing view data, and second formation is used to place the memory address of having deposited view data; In described first formation when being empty, the memory address of head nodes records in described second formation is input in the described buffer address register;
Described direct memory access unit is used for the up-to-date image data storage that collects of described image capture device in the indicated memory address of described buffer address register; The indicated memory address of described buffer address register is meant the memory address of depositing the up-to-date view data that collects that the buffer address maintenance unit is selected.
2. portable terminal as claimed in claim 1 is characterized in that,
Described buffer address maintenance unit, also be used for when the described first formation non-NULL, the memory address of head nodes records in described first formation is input in the described buffer address register, and in described direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described first formation and delete the head node of this memory address of record in described first formation.
3. portable terminal as claimed in claim 2 is characterized in that,
Described buffer address maintenance unit, also be used for when described first formation is sky, the memory address of head nodes records in described second formation is input in the described buffer address register, and in described direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described second formation and delete the head node of this memory address of record in described second formation.
4. as claim 2 or 3 described portable terminals, it is characterized in that,
Described address acquisition unit is used for when described upper application module need be obtained view data, sends to described buffer address maintenance unit and triggers message; After also being used to receive the memory address that described buffer address maintenance unit provides, return to described upper application module;
Described buffer address maintenance unit also is used for after receiving the triggering message that described address acquisition unit sends, and the memory address of the head nodes records of described second formation is offered described address acquisition unit, and this node is deleted from second formation;
Described upper application module is used for obtaining view data from the memory address that described address acquisition unit provides.
5. as claim 2 or 3 described portable terminals, it is characterized in that,
Described address acquisition unit is used for when described upper application module need be obtained view data, sends to described buffer address maintenance unit and triggers message; After also being used to receive the memory address that described buffer address maintenance unit provides, return to described upper application module;
Described buffer address maintenance unit, also be used for after receiving the triggering message that described address acquisition unit sends, to offer described address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, from described second formation, move to preceding M node in described second formation in described first formation successively; M is the integer greater than 1;
Described upper application module is used for obtaining view data from the memory address that described address acquisition unit provides.
6. as claim 2 or 3 described portable terminals, it is characterized in that,
The memory capacity of the memory address of each nodes records is the size of a frame image data in described first formation that described buffer address maintenance unit is safeguarded and second formation.
7. the method for a caching image data in real time comprises:
The image capture device of portable terminal is up-to-date collect view data after, when being used for all having had view data on the memory address of caching image data, the direct memory access unit with described up-to-date image data storage in the memory address that deposits view data the earliest in, be i.e. first formation and second formation of two First Input First Outputs of buffer address maintenance unit real-time servicing of portable terminal, first formation is used to place the memory address of not depositing view data, and second formation is used to place the memory address of having deposited view data; In described first formation when being empty, the memory address of head nodes records in described second formation is input in the buffer address register.
8. method as claimed in claim 7 is characterized in that,
The image capture device of portable terminal is up-to-date collect view data after, during the described first formation non-NULL, described buffer address maintenance unit is input to the memory address of head nodes records in described first formation in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described first formation and delete the head node of this memory address of record in described first formation; And;
The image capture device of portable terminal is up-to-date collect view data after, when described first formation is empty, described buffer address maintenance unit is input to the memory address of head nodes records in described second formation in the buffer address register, and in the direct memory access unit with the up-to-date image data storage that collects to the memory address of described buffer address register indication, add in described second formation as the afterbody node this memory address of head nodes records in described second formation and delete the head node of this memory address of record in described second formation.
9. method as claimed in claim 8 is characterized in that,
Upper application module needs when the memory address that is used for caching image data obtains view data, described buffer address maintenance unit offers upper application module with the memory address of the head nodes records of described second formation by address acquisition unit, and this node is deleted from second formation; Described upper application module is obtained view data from the memory address that described address acquisition unit provides.
10. method as claimed in claim 8 is characterized in that,
Upper application module needs when the memory address that is used for caching image data obtains view data, described buffer address maintenance unit will offer upper application module by address acquisition unit apart from the memory address of M+1 nodes records of the second formation head node, and move to preceding M node in described second formation in described first formation from described second formation successively; M is the integer greater than 1; Described upper application module is obtained view data from the memory address that described address acquisition unit provides.
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| CN101937559B (en) * | 2010-08-23 | 2016-08-17 | 无锡中感微电子股份有限公司 | A kind of grabgraf method and grabgraf device |
| CN102271191A (en) * | 2011-08-31 | 2011-12-07 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal and method for data access thereof |
| CN105491281B (en) * | 2015-11-24 | 2019-01-25 | 深圳眼神智能科技有限公司 | The method and apparatus for improving image acquisition speed |
| CN110519497B (en) * | 2019-08-28 | 2020-11-17 | 中国大恒(集团)有限公司北京图像视觉技术分公司 | Zero-copy trigger acquisition device and method based on VDMA |
| CN111746400B (en) * | 2020-06-29 | 2021-11-05 | 珠海全志科技股份有限公司 | Method for rapidly displaying reverse cold start image, computer device and computer readable storage medium |
| CN113328998B (en) * | 2021-05-14 | 2023-02-21 | 维沃移动通信有限公司 | Image data transmission method and electronic equipment |
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