CN106598596A - OpenCL image processing method based on Androrid platform - Google Patents

OpenCL image processing method based on Androrid platform Download PDF

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Publication number
CN106598596A
CN106598596A CN201611154205.0A CN201611154205A CN106598596A CN 106598596 A CN106598596 A CN 106598596A CN 201611154205 A CN201611154205 A CN 201611154205A CN 106598596 A CN106598596 A CN 106598596A
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opencl
function
camera
call
kernel
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褚孝鹏
毛治东
赵文浩
李松梁
李发德
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Tianjin Optical Electrical Communication Technology Co Ltd
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Tianjin Optical Electrical Communication Technology Co Ltd
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Priority to CN201611154205.0A priority Critical patent/CN106598596A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/30—Creation or generation of source code
    • G06F8/31—Programming languages or programming paradigms
    • G06F8/315—Object-oriented languages
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/20—Software design
    • G06F8/24—Object-oriented
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/30—Creation or generation of source code
    • G06F8/38—Creation or generation of source code for implementing user interfaces
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/40—Transformation of program code
    • G06F8/41—Compilation

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  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • Human Computer Interaction (AREA)
  • Processing Or Creating Images (AREA)

Abstract

The invention discloses an OpenCL image processing method based on an Androrid platform. OpenCL is combined with an Androrid system so as to realize image processing. Due to the fact that the Androrid platform is open, and can get rid of constraint of operators, an extremely wide and free environment is provided for third-party developers due to the features such as abundant hardware selection. The OpenCL is expanded with GPU for capacity except graphic production, efficient processing for images and videos can be realized. Therefore, OpenCL development frameworks can be applied to Androrid platforms, and some applications of images in the GPU for OpenCL are explored, so that efficient processing for the images is realized.

Description

OpenCL image processing methods based on Andorid platforms
Technical field
The present invention relates to image processing field, more particularly to a kind of OpenCL image processing methods based on Andorid platforms Method.
Background technology
Instantly requirement of the people to mobile phone is improved again and again.Except basic communicating requirement, most of mobile phones can realize which His sophisticated functions.Additionally, with the transmission and process of the development of multimedia communication, image and video, it has also become a new generation is mobile The study hotspot of equipment.Application at present with regard to Android system is very more, and has the impetus for continuing to increase, and Used as the image procossing for always being hot topic, its expressive ability under android system is also paid high attention to by people.
Android is the operating system of a kind of freedom based on Linux and open source code, is mainly used for movement and sets It is standby, such as smart mobile phone and panel computer, led and developed by Google companies and open mobile phone alliance.Android operation system Initially developed by AndyRubin, mainly support mobile phone.First Android intelligent is published in October, 2008. Android is gradually expanded on panel computer and other field, such as TV, digital camera, game machine etc..Due to opening Property, the constraint of operator can be shaken off, the features such as abundant hardware is selected, be widely used and favored by people.
OpenCL (full name OpenComputingLanguage, open computing language) is first logical towards heterogeneous system With open, the free standard of purpose multiple programming, and a unified programmed environment, it is easy to software developer to be high property Energy calculation server, desktop computing system, handheld device write the code of high-efficient light, and are widely used in multi-core process Other parallel processors such as device (CPU), graphic process unit (GPU), Cell type architectures and digital signal processor (DSP), There is vast potential for future development in various fields such as game, amusement, scientific research, medical treatment.
The content of the invention
The present invention discloses a kind of OpenCL image procossings based on Android platform, and OpenCL is tied with android system Altogether, realize the process of image.OpenCL is utilized to extend GPU for the ability outside graphic hotsopt, it can realize figure The efficient process of picture and video etc..Therefore the Development Framework of OpenCL can be applied to Android platform by the present invention, probe into Some applications of OpenCL in GPU in terms of image, realize the efficient process of image.
To achieve these goals, the present invention adopts following scheme：
It is as follows based on the OpenCL image processing methods of Android platform, including step：
Step one：The spatial design of start page；
Step 2：The design of camera-enabled and realization；
Step 3：Build NDK environment；
Step 4：OpenCL is programmed；
Step 5：The Preliminary Practice that OpenCL is run in Android phone.
The step one specifically includes following steps：
S1：With RelativeLayout with relative mode layout, the RelativeLayout is preferably image button Parameter, the parameter that preview is carried out to view and display take pictures after image parameters combination；
S2：Photographing unit interface display is configured；The width and height of preferred pair described image is configured；
S3：Button is configured；The width and height of button described in preferred pair is configured, and also includes to the button Position be configured；
S4：Preview interface is configured；Described in preferred pair, interface width, height and position are configured；
S5：Photo display interface is configured；Described in preferred pair, the width of photo display interface, height and position are carried out Arrange.The step 2 specifically includes following steps：
S1：The open () function of Camera is called to open camera；It is preferred that opening the post-positioned pick-up head of the camera, need to such as beat The specified photographic head of the camera is opened, is the incoming specified photographic head ID of the function open ()；
S2：Call the getParameters () function of Camera to obtain parameter of taking pictures, return one Camera.Parameters objects；
S3：Call Camera.Parameters object functions that parameter of taking pictures is set；
S4:Call which setPreviewDisplay (SurfaceHolderholder) function setup of Camera uses SurfaceView is called the startPreview () function of Camera to start preview and is found a view showing picture of finding a view；
S5：The takePicture () function of Camera is called to be taken pictures；
S6：Call the stopPrview () of Camera to terminate preview of finding a view, and call release () function release resource, So as to terminate program.
The step 3 specifically includes following steps：
S1：Modification mk files；
S2:So is created, and so and java applications are packaged into together automatically by apk by NDK.
The step 4 specifically includes following steps：
S1：Obtain device id；The device id is obtained preferably through call function clGetDeviceIDs ()；
S2：Obtain context；The context is obtained preferably through call function clCreateContext ()；
S3：Create an OpenCL command queue；It is preferred that being created by call function clCreateCommandQueue () Build an OpenCL command queue；
S4：Establishment program is cached with source code；Preferably through call function clCreateProgramWithSource () Or clCreateProgramWithBinary () is creating described program object；
S5：Build OpenCL programs；It is preferred that building the OpenCL journeys by call function clBuildProgram () Sequence；The structure information of each equipment is returned by call function clGetProgramBuildInfo ()；
S6：Create kernel objects；An interior verification is created preferably through call function clCreateKernel () As；
S7：Create cache object；The cache object is created preferably through call function clCreateBuffer ()；
S8：By input-buffer write device end；Come real preferably through call function clEnqueueWriteBuffer () The input-buffer is write the equipment end by existing write order；
S9：To calculating kernel transmission argument；Come for the calculating preferably through call function clSetKernelArg () Kernel transmits the argument；
S10：Obtain the maximum of the working group that kernel is performed on equipment；Preferably through call function ClGetKernelWorkGroupInfo () come obtain it is described perform kernel maximum functional group value；
S11：Perform kernel function；Preferably through call function clEnqueueNDRangeKernel () or ClEnqueueTask () is performed to queue up and is calculated the kernel；
S12：End is performed Deng Wait Order and result of calculation is obtained；Wait preferably through call function clFinish () The order execution terminates and passes through call function clEnqueueReadBuffer () to obtain the OpenCL kernels calculating The result of calculation of function.
The step 5 specifically includes following steps：
S1：Whether confirmation equipment supports OpenCL；OpenCL-Z softwares are preferably used to MEIZU-Mx4Pro cell phone apparatus Carry out OpenCL detections；
S2：Find opencl storehouses；
S3：Set up dynamic base；
S4：Quote OpenCL header files；
S5:Run according to common NDK programs.
The invention has the beneficial effects as follows OpenCL is combined with android system, the process of image is realized.Due to Android platform has opening, can shake off the constraint of operator, to third party developer the features such as abundant hardware is selected One very wide in range free environment.OpenCL extends GPU for the ability outside graphic hotsopt, it can realize image and The efficient process of video etc..Therefore the Development Framework of OpenCL can be applied to Android platform by the present invention, probe into OpenCL Some applications in GPU in terms of image, realize the efficient process of image.
Description of the drawings
Fig. 1 is photographing unit interface setting procedure figure of the present invention.
Fig. 2 is present invention release photographic head flow chart.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described in detail.
Specific embodiment operating procedure：
The first step：The spatial design of start page
Control in start page is the relative placement with RelativeLayout, RelativeLayout by it View views are discharged in an opposing fashion, and this depends on its attribute and arranges：Discharged with relative mode.This start page Layout is as follows：One ImageButton, a SurfaceView are combined at one with an Imageview In RelativeLayout, this RelativeLayout is with relative mode layout.
ImageButton is image button, as the effect of Button, can select suitable picture as button. SurfaceView is used for showing preview interface that in this layout, its effect is to carry out preview to view, in the upper of button Side, button are placed in the middle of screen, and ImageView is disposed below relative to button for showing the picture after taking pictures.
xmlns:Android=" http://schemas.android.com/apk/res/android"
android:Orientation=" vertical "
android:Layout_width=" match_parent "
android:Layout_height=" match_parent "
As above code is the setting to photographing unit interface display, and layout_width=" match_parent " is to arrange which Width adequate screen width, layout_height=" match_parent " are to arrange its height to adapt to screen.
Photographing unit interface display setting procedure is as shown in Figure 1.
As above code is the setting carried out to button, and layout_width=" wrap_content " is the width of settings button Degree adapts to the size of content, and layout_height=" wrap_content " is the size that the height of settings button adapts to content, android:Layout_centerInParent=" true " is the center that the position of settings button is located at screen.
As above code is the setting to preview interface, android:Layout_width=" match_parent " is to arrange The width of the width adequate screen at the interface, layout_height=" match_parent " are that the height for arranging the interface is fitted Answer the height of screen, android:Layout_above="@id/button " is that the position for arranging the interface is just being located at button Top.
As above code is the setting to photo display interface, android:Layout_width=" match_parent " is The width of the width adequate screen at the interface is set, and layout_height=" match_parent " is the height for arranging the interface Degree adapts to the height of screen, android:Layout_below="@id/button " is that the position for arranging the interface is located at button Underface.
Second step：The design of camera-enabled and realization
Present mobile phone typically can all provide camera function, and the camera lens of some cameras even supports more than 10,000,000 pixels, Some even support that optical zoom, these mobile phones have had changed into the digital camera of specialty.In order to make full use of the phase on mobile phone Machine function, Android applications can control to take pictures.
Android controls to take pictures using there is provided Camera, is taken pictures using Camera also fairly simple, and step is such as Under：
1. call the open () function of Camera to open camera.The method acquiescence opens post-positioned pick-up head.If necessary to beat Specified photographic head is opened, can be the incoming photographic head ID of the method.The flow process for opening photographic head is as shown in Figure 2.
2. call the getParameters () function of Camera to obtain parameter of taking pictures.The method returns one Camera.Parameters objects.
3. call Camera.Parameters object functions that parameter of taking pictures is set.
4. call the startPreview () function of Camera to start preview and find a view, needed to call before preview is found a view SetPreviewDisplay (SurfaceHolderholder) function setups of Camera are shown using which SurfaceView Show picture of finding a view.
5. call the takePicture () function of Camera to be taken pictures.
6., when terminating program, call the stopPrview () function of Camera to terminate preview of finding a view, and call release () function discharges resource.
3rd step：Build NDK environment
The full name of NDK is Native Development Kit.NDK provides a series of instrument, helps developer fast The dynamic base of speed exploitation C (or C++), and so and java applications can be packaged into into apk together automatically.These instruments are to developer's Help is huge.
NDK is integrated with cross-compiler, and provides the differences such as corresponding mk files isolation CPU, platform, ABI, exploit person Member only needs to simply change mk files (pointing out " which file needs compiling ", " compiling characteristic requirements " etc.), it is possible to be created that so.So and Java applications automatically can also be packed by NDK together, dramatically reduce the packing work of developer.
4th step：OpenCL is programmed
OpenCL applications are in two sub-sections：One is host side application；One is OpenCL kernels.
Create an opencl application：
1. device id is obtained：
One or more device ids are obtained using clGetDeviceIDs () function；After having called this function, if Return value is successfully, then just can create context with this ID later；
2. context is obtained：
Context is obtained using clCreateContext () function；When OpenCL runs, context is used to manage right As with one or more specified within a context equipment on execution kernel；
3. a command queue is created：
An OpenCL command queue is created using clCreateCommandQueue () function；OpenCL command queues For work is submitted to equipment, they arrange the execution of kernel on an equipment, and operate memory object；
4. establishment program is cached with source code：
Using clCreateProgramWithSource () function or clCreateProgramWithBinary () function To create program object；One OpenCL program is made up of one group of kernel；One kernel is with _ _ kernel limits in source code The function of fixed symbol modification；OpenCL programs can also include auxiliary function and constant data；They are used by kernel function；One Program object contains following information：One associated context；One program source code or binary code；It is most recently successfully The executable program being fabricated, the executable program are fabricated according to the list of devices for above being created；It is current connected The number of the kernel objects for connecing；
5. OpenCL programs are built：
Using clCreateProgramWithSource () function creation it is complete be a program pair comprising source code As；OpenCL programs that will be on operation equipment must be compiled to it, connect；And for The program object of clCreateProgramWithBinary () function creation, then need to be attached；Can thus build Into a complete configuration processor for loading；OpenCL programs are built using clBuildProgram () function； ClGetProgramBuildInfo () function returns structure information of each device in programobject；
6. kernel objects are created：
Using one kernel objects of clCreateKernel () function creation；One kernel objects correspond to an OpenCL With a kernel function of _ _ kernel modification in program；When kernel objects encapsulate kernel function and perform this kernel function Argument；
7. cache object is created：
Cache object is created using clCreateBuffer () function；The memory object of OpenCL is divided into two species Type, one kind are cache objects, and another kind is image object；Cache object storage is one group of one-dimensional element set；And image pair Texture or frame buffer or image as depositing a two dimension or three-dimensional；Data in cache object can be any by a pointer Obtain；And the data of image object are then to need to conduct interviews by corresponding API；Memory object is by being used as to kernel letter Several arguments is operated by OpenCL kernel functions；
8. by input-buffer write device end：
Write order is realized using clEnqueueWriteBuffer () function；After having created input-buffer object, need Data transfer in the addressable memorizer of OpenCL equipment ends, then write order can be issued by command queue Perform this operation；
9. pair calculating kernel transmits argument：
Argument is transmitted to calculate kernel using clSetKernelArg () function；Perform a kernel, it is necessary to first To its arrange parameter；
10. the maximum of the working group that kernel is performed on equipment is obtained：
The maximum functional group size of specified kernel objects is obtained using clGetKernelWorkGroupInfo () function；
11. perform kernel function：
Queued up using clEnqueueNDRangeKernel () function and perform the order for calculating a kernel；If kernel Performed using single work item, such as operated on a CPU, then function clEnqueueTask () can be used；
The pending end such as 12. and acquisition result：
Wait all orders in command queue to perform to complete by calling clFinish () function；By calling ClEnqueueReadBuffer () function calculates the result of calculation of function to obtain OpenCL kernels, clicks on button (button) Image in preview interface is carried out into black and white process, the process for clicking on button contains the operation of opencl programs, can obtain GPU With two carrying out practically times of CPU, in practice GPU run times be 0.022908s, CPU run times be 0.020197s；
5th step：The Preliminary Practice that OpenCL is run in Android phone
1. whether confirmation equipment supports OpenCL
This is one step of most critical, and whether inspection equipment supports opencl (if it does not, cannot run)；Use OpenCL-Z softwares carry out OpenCL detections to MEIZU-Mx4Pro cell phone apparatus, as a result show that the equipment supports the volume of OpenCL Journey.
2. opencl storehouses are found
The storehouse for supporting OpenCL is found in a device；
3. dynamic base is set up
The storehouse found in second step, pull out, as the dynamic base of compiler
4. OpenCL header files are quoted
OpenCL programs are often write in Android engineerings, OpenCL header files are quoted.
Remarks：Android directly links storehouse above when compiling, use when Java ends compile System.load () function is being loaded into the OpenCL storehouses.
5. run according to common NDK programs
The invention has the beneficial effects as follows OpenCL is combined with android system, the process of image is realized.Due to Android platform has opening, can shake off the constraint of operator, to third party developer the features such as abundant hardware is selected One very wide in range free environment.OpenCL extends GPU for the ability outside graphic hotsopt, it can realize image and The efficient process of video etc..Therefore the Development Framework of OpenCL can be applied to Android platform by the present invention, probe into OpenCL Some applications in GPU in terms of image, realize the efficient process of image.
Above embodiments of the invention are described in detail, but the content have been only presently preferred embodiments of the present invention, It is not to be regarded as limiting practical range of the invention.All impartial change, improvement or groups made according to the present patent application scope Close etc., still all should belong within the patent covering scope of the present invention.

Claims (6)

1. the OpenCL image processing methods based on Android platform, including step are as follows：
Step one：The spatial design of start page；
Step 2：The design of camera-enabled and realization；
Step 3：Build NDK environment；
Step 4：OpenCL is programmed；
Step 5：The Preliminary Practice that OpenCL is run in Android phone.
2. image processing method according to claim 1, it is characterised in that：The step one specifically includes following steps：
S1：With RelativeLayout with relative mode layout, the RelativeLayout be preferably image button parameter, View is carried out preview parameter and show take pictures after image parameters combination；
S2：Photographing unit interface display is configured；The width and height of preferred pair described image is configured；
S3：Button is configured；The width and height of button described in preferred pair is configured, and also includes the position to the button Put and be configured；
S4：Preview interface is configured；Described in preferred pair, interface width, height and position are configured；
S5：Photo display interface is configured；Described in preferred pair, the width of photo display interface, height and position are set Put.
3. image processing method according to claim 1, it is characterised in that：The step 2 specifically includes following steps：
S1：The open () function of Camera is called to open camera；It is preferred that the post-positioned pick-up head of the camera is opened, as institute need to be opened The specified photographic head of camera is stated, is the incoming specified photographic head ID of the function open ()；
S2：Call the getParameters () function of Camera to obtain parameter of taking pictures, return a Camera.Parameters Object；
S3：Call Camera.Parameters object functions that parameter of taking pictures is set；
S4:Call which setPreviewDisplay (SurfaceHolderholder) function setup of Camera uses SurfaceView is called the startPreview () function of Camera to start preview and is found a view showing picture of finding a view；
S5：The takePicture () function of Camera is called to be taken pictures；
S6：Call the stopPrview () of Camera to terminate preview of finding a view, and call release () function release resource, so as to End program.
4. image processing method according to claim 1, it is characterised in that：The step 3 specifically includes following steps：
S1：Modification mk files；
S2:So is created, and so and java applications are packaged into together automatically by apk by NDK.
5. image processing method according to claim 1, it is characterised in that：The step 4 specifically includes following steps：
S1：Obtain device id；The device id is obtained preferably through call function clGetDeviceIDs ()；
S2：Obtain context；The context is obtained preferably through call function clCreateContext ()；
S3：Create an OpenCL command queue；It is preferred that creating one by call function clCreateCommandQueue () The individual OpenCL command queues；
S4：Establishment program is cached with source code；Preferably through call function clCreateProgramWithSource () or ClCreateProgramWithBinary () is creating described program object；
S5：Build OpenCL programs；It is preferred that building the OpenCL programs by call function clBuildProgram ()；
The structure information of each equipment is returned by call function clGetProgramBuildInfo ()；
S6：Create kernel objects；The kernel objects are created preferably through call function clCreateKernel ()；
S7：Create cache object；The cache object is created preferably through call function clCreateBuffer ()；
S8：By input-buffer write device end；Realize writing preferably through call function clEnqueueWriteBuffer () The input-buffer is write the equipment end by order；
S9：To calculating kernel transmission argument；Come for the calculating kernel preferably through call function clSetKernelArg () Transmit the argument；
S10：Obtain the maximum of the working group that kernel is performed on equipment；Preferably through call function ClGetKernelWorkGroupInfo () come obtain it is described perform kernel maximum functional group value；
S11：Perform kernel function；Preferably through call function clEnqueueNDRangeKernel () or ClEnqueueTask () is performed to queue up and is calculated the kernel；
S12：End is performed Deng Wait Order and result of calculation is obtained；Wait described preferably through call function clFinish () Order execution terminates and passes through call function clEnqueueReadBuffer () to obtain the OpenCL kernels calculating function The result of calculation.
6. image processing method according to claim 1, it is characterised in that：The step 5 specifically includes following steps：
S1：Whether confirmation equipment supports OpenCL；Preferably using OpenCL-Z softwares is carried out to MEIZU-Mx4Pro cell phone apparatus OpenCL is detected；
S2：Find opencl storehouses；
S3：Set up dynamic base；
S4：Quote OpenCL header files；
S5:Run according to common NDK programs.
CN201611154205.0A 2016-12-14 2016-12-14 OpenCL image processing method based on Androrid platform Pending CN106598596A (en)

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CN108769518A (en) * 2018-05-29 2018-11-06 深圳美图创新科技有限公司 Camera exchange method, device, electronic equipment and computer readable storage medium
CN109976836A (en) * 2019-01-31 2019-07-05 中山大学 A kind of method and system obtaining android terminal camera data
CN111158669A (en) * 2019-12-06 2020-05-15 佛山缔乐视觉科技有限公司 Graphical programming visual system and industrial control method
CN112486684A (en) * 2020-11-30 2021-03-12 展讯半导体(成都)有限公司 Driving image display method, device and platform, storage medium and embedded equipment

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN108769518A (en) * 2018-05-29 2018-11-06 深圳美图创新科技有限公司 Camera exchange method, device, electronic equipment and computer readable storage medium
CN108769518B (en) * 2018-05-29 2020-07-28 深圳美图创新科技有限公司 Camera interaction method and device, electronic equipment and computer readable storage medium
CN109976836A (en) * 2019-01-31 2019-07-05 中山大学 A kind of method and system obtaining android terminal camera data
CN111158669A (en) * 2019-12-06 2020-05-15 佛山缔乐视觉科技有限公司 Graphical programming visual system and industrial control method
CN112486684A (en) * 2020-11-30 2021-03-12 展讯半导体(成都)有限公司 Driving image display method, device and platform, storage medium and embedded equipment

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Application publication date: 20170426