WO2018032917A1 - 一种移动终端、获取对焦值的方法以及计算机可读存储介质 - Google Patents

一种移动终端、获取对焦值的方法以及计算机可读存储介质 Download PDF

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Publication number
WO2018032917A1
WO2018032917A1 PCT/CN2017/092693 CN2017092693W WO2018032917A1 WO 2018032917 A1 WO2018032917 A1 WO 2018032917A1 CN 2017092693 W CN2017092693 W CN 2017092693W WO 2018032917 A1 WO2018032917 A1 WO 2018032917A1
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WIPO (PCT)
Prior art keywords
pixel
focus
value
focus window
mobile terminal
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PCT/CN2017/092693
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English (en)
French (fr)
Inventor
姬向东
付一鹏
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努比亚技术有限公司
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Publication of WO2018032917A1 publication Critical patent/WO2018032917A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/52—Details of telephonic subscriber devices including functional features of a camera

Definitions

  • This document relates to, but is not limited to, smart terminal technology, and more particularly to a mobile terminal, a method of acquiring a focus value, and a computer readable storage medium.
  • the focusing process includes the following steps:
  • FV represents a focus value of a current frame image
  • Q(i) represents a filtered value of a luminance value of the i-th pixel point
  • n represents a total number of pixel points included in the focus window
  • the largest FV is selected among all FVs, and the corresponding lens position is the clearest position.
  • the present application provides a mobile terminal and a method for acquiring a focus value, which can improve the accuracy of focusing and improve the user experience.
  • An embodiment of the present invention provides a mobile terminal, including: an obtaining module, a filtering module, a first determining module, and a computing module;
  • Obtaining a module configured to obtain a brightness value of each pixel included in the focus window in the current frame image
  • a filtering module configured to filter the obtained brightness value of each pixel to obtain a filtered value of the brightness value of each pixel
  • a first determining module configured to determine a weight value corresponding to each pixel point
  • the calculating module is configured to calculate a focus value of the current frame image according to the obtained filtered value of the brightness value of each pixel point and the determined weight value corresponding to each pixel point.
  • the mobile terminal further includes: a detecting module and a second determining module; wherein
  • the detecting module is configured to detect whether there is an external command that meets a preset condition; when detecting that there is an external command that meets the preset condition, send a first notification to the second determining module; when the presence of the matching is not detected When the conditional external command is set, sending a second notification to the second determining module; correspondingly,
  • the second determining module is configured to receive a first notification from the detecting module, acquire first position information of an external command, determine the focus window according to the obtained position information of the external command, and receive the detection from the detecting
  • the second notification of the module uses the preset area as the focus window.
  • the first determining module is configured to determine a weight value corresponding to each pixel point by:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the calculation module is configured to calculate a focus value of the current frame image by:
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents the focus window The total number of pixels included.
  • the first determining module is configured to determine a weight value corresponding to each pixel point by:
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a, b are both Represents a constant
  • ⁇ indicates tuning the tuning parameter.
  • the second determining module is configured to determine the focus window according to the obtained first position information of the external instruction by:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and a circle of radius or The area covered by the square of the side length is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • the square comprises a rectangle or a square
  • the embodiment of the invention further provides a method for acquiring a focus value, which is applied to a focusing process, and includes:
  • the mobile terminal acquires a brightness value of each pixel included in the focus window in the current frame image
  • the focus value of the current frame image is calculated according to the obtained filtered value of the luminance value of each pixel and the determined weight value corresponding to each pixel.
  • the method before the obtaining the brightness value of each pixel included in the focus window, the method further includes:
  • the preset area is used as the focus window.
  • the determining the weight value corresponding to each pixel point includes:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the focus value of the current frame image is calculated according to the following formula:
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents the focus window The total number of pixels included.
  • the weight value corresponding to each pixel point is determined according to the following formula:
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a, b are both Represents a constant
  • ⁇ indicates tuning the tuning parameter.
  • determining, according to the obtained first location information of the external instruction, the focus window includes:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and a circle of radius or The area covered by the square of the side length is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • the square comprises a rectangle or a square
  • the embodiment of the invention further provides a mobile terminal, including:
  • Memory set to store instructions
  • the processor configured to execute the instructions, implements the step of acquiring the focus value method described above.
  • the embodiment of the invention further provides a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by the processor, the following steps are implemented:
  • the focus value of the current frame image is calculated according to the obtained filtered value of the luminance value of each pixel and the determined weight value corresponding to each pixel.
  • the preset area is used as the focus window.
  • the computer program is executed by the processor to determine a weight value corresponding to each pixel point in the following manner:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the focus value of the current frame image is calculated in the following manner:
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents the focus window The total number of pixels included.
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a, b are both Represents a constant
  • ⁇ indicates tuning the tuning parameter.
  • the embodiment of the invention includes: the mobile terminal acquires the brightness value of each pixel included in the focus window in the current frame image; and filters the obtained brightness value of each pixel to obtain the brightness value of each pixel a value; determining a weight value corresponding to each pixel point; calculating a focus value of the current frame image according to the obtained filtered value of the brightness value of each pixel point and the determined weight value corresponding to each pixel point.
  • the embodiment of the invention improves the accuracy of focusing and improves the user experience.
  • FIG. 1 is a schematic structural diagram of hardware of an optional mobile terminal implementing various embodiments of the present application
  • FIG. 2 is a schematic diagram of a communication system supporting communication between mobile terminals of the present application
  • FIG. 3 is a schematic structural diagram of a mobile terminal according to the present application.
  • FIG. 4 is a flowchart of a method for acquiring a focus value according to the present application.
  • Figure 5 (a) is a first schematic view of the side of the display screen of the mobile terminal of the present application.
  • Figure 5 (b) is a second schematic view of the side of the display screen of the mobile terminal of the present application.
  • FIG. 6 is a flow chart of an embodiment of a method for acquiring a focus value of the present application.
  • the mobile terminal can be implemented in various forms.
  • the terminal described in the embodiments of the present invention may include, for example, a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (Personal Digital Assistant), a PAD (Tablet), a PMP (Portable Multimedia Player), a navigation device Mobile terminals of the like and fixed terminals such as digital TVs, desktop computers, and the like.
  • PDA Personal Digital Assistant
  • PAD Tablett
  • PMP Portable Multimedia Player
  • FIG. 1 is a schematic structural diagram of hardware of an optional mobile terminal implementing various embodiments of the present application.
  • the mobile terminal 100 may include a wireless communication unit 110, an A/V (Audio/Video) input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, an interface unit 170, a controller 180, and a power supply unit 190. and many more.
  • Figure 1 illustrates a mobile terminal having various components, but it should be understood that not all illustrated components are required to be implemented. More or fewer components can be implemented instead. The elements of the mobile terminal will be described in detail below.
  • Wireless communication unit 110 typically includes one or more components that permit radio communication between mobile terminal 100 and a wireless communication system or network.
  • the wireless communication unit may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless internet module 113, a short-range communication module 114, and a location information module 115.
  • the broadcast receiving module 111 receives a broadcast signal and/or broadcast associated information from an external broadcast management server via a broadcast channel.
  • the broadcast channel can include a satellite channel and/or a terrestrial channel.
  • the broadcast management server may be a server that generates and transmits a broadcast signal and/or broadcast associated information or a server that receives a previously generated broadcast signal and/or broadcast associated information and transmits it to the terminal.
  • the broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and the like.
  • the broadcast signal may further include a broadcast signal combined with a TV or radio broadcast signal.
  • the broadcast associated information may also be provided via a mobile communication network, and in this case, the broadcast associated information may be received by the mobile communication module 112.
  • the broadcast signal may exist in various forms, for example, it may exist in the form of Digital Multimedia Broadcasting (DMB) Electronic Program Guide (EPG), Digital Video Broadcasting Handheld (DVB-H) Electronic Service Guide (ESG), and the like.
  • the broadcast receiving module 111 can receive a signal broadcast by using various types of broadcast systems.
  • the broadcast receiving module 111 can use forward link media (MediaFLO) by using, for example, multimedia broadcast-terrestrial (DMB-T), digital multimedia broadcast-satellite (DMB-S), digital video broadcast-handheld (DVB-H)
  • MediaFLO forward link media
  • the digital broadcasting system of the @ ) data broadcasting system, the terrestrial digital broadcasting integrated service (ISDB-T), and the like receives digital broadcasting.
  • the broadcast receiving module 111 can be constructed as various broadcast systems suitable for providing broadcast signals as well as the above-described digital broadcast system.
  • the broadcast signal and/or broadcast associated information received via the broadcast receiving module 111 may be stored in the memory 160 (or other type of
  • the mobile communication module 112 transmits the radio signals to and/or receives radio signals from at least one of a base station (e.g., an access point, a Node B, etc.), an external terminal, and a server.
  • a base station e.g., an access point, a Node B, etc.
  • Such radio signals may include voice call signals, video call signals, or various types of data transmitted and/or received in accordance with text and/or multimedia messages.
  • the wireless internet module 113 supports wireless internet access of the mobile terminal.
  • the module can be internally or externally coupled to the terminal.
  • the wireless Internet access technologies involved in the module may include WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless Broadband), Wimax (Worldwide Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), etc. .
  • the short range communication module 114 is a module that is configured to support short range communication.
  • Some examples of short-range communication technology include Bluetooth TM, a radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), ZigBee, etc. TM.
  • the location information module 115 is a module configured to check or acquire location information of the mobile terminal.
  • a typical example of a location information module is GPS (Global Positioning System).
  • GPS Global Positioning System
  • the GPS module 115 calculates distance information and accurate time information from three or more satellites and applies triangulation to the calculated information to accurately calculate three-dimensional current position information based on longitude, latitude, and altitude.
  • the method for calculating position and time information uses three satellites and corrects the calculated position and time information errors by using another satellite.
  • the GPS module 115 is capable of calculating speed information by continuously calculating current position information in real time.
  • the A/V input unit 120 is arranged to receive an audio or video signal.
  • the A/V input unit 120 may include a camera 121 and a microphone 122 that processes image data of still pictures or video obtained by the image capturing device in a video capturing mode or an image capturing mode. Processed image The frame can be displayed on the display unit 151.
  • the image frames processed by the camera 121 may be stored in the memory 160 (or other storage medium) or transmitted via the wireless communication unit 110, and two or more cameras 121 may be provided according to the configuration of the mobile terminal.
  • the microphone 122 can receive sound (audio data) via a microphone in an operation mode of a telephone call mode, a recording mode, a voice recognition mode, and the like, and can process such sound as audio data.
  • the processed audio (voice) data can be converted to a format output that can be transmitted to the mobile communication base station via the mobile communication module 112 in the case of a telephone call mode.
  • the microphone 122 can implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated during the process of receiving and transmitting audio signals.
  • the user input unit 130 may generate key input data according to a command input by the user to control various operations of the mobile terminal.
  • the user input unit 130 allows the user to input various types of information, and may include a keyboard, a pot, a touch pad (eg, a touch sensitive component that detects changes in resistance, pressure, capacitance, etc. due to contact), a scroll wheel , rocker, etc.
  • a touch screen can be formed.
  • the sensing unit 140 detects the current state of the mobile terminal 100 (eg, the open or closed state of the mobile terminal 100), the location of the mobile terminal 100, the presence or absence of contact (ie, touch input) by the user with the mobile terminal 100, and the mobile terminal.
  • the sensing unit 140 can sense whether the slide type phone is turned on or off.
  • the sensing unit 140 can detect whether the power supply unit 190 provides power or whether the interface unit 170 is coupled to an external device.
  • the interface unit 170 serves as an interface through which at least one external device can connect with the mobile terminal 100.
  • the external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port configured to connect a device having an identification module, and an audio input/output. (I/O) port, video I/O port, headphone port, and more.
  • the identification module may be stored to verify various information used by the user using the mobile terminal 100 and may include a User Identification Module (UIM), a Customer Identification Module (SIM), a Universal Customer Identity Module (USIM), and the like.
  • the device having the identification module may take the form of a smart card, and thus the identification device may be connected to the mobile terminal 100 via a port or other connection device.
  • the interface unit 170 can be configured to receive input from an external device (eg, number The received input is transmitted to one or more components within the mobile terminal 100 or may be arranged to transfer data between the mobile terminal and the external device.
  • the interface unit 170 may function as a path through which power is supplied from the base to the mobile terminal 100 or may be used as a transmission of various command signals allowing input from the base to the mobile terminal 100 The path to the terminal.
  • Various command signals or power input from the base can be used as signals for identifying whether the mobile terminal is accurately mounted on the base.
  • Output unit 150 is configured to provide an output signal (eg, an audio signal, a video signal, an alarm signal, a vibration signal, etc.) in a visual, audio, and/or tactile manner.
  • the output unit 150 may include a display unit 151, an audio output module 152, an alarm unit 153, and the like.
  • the display unit 151 can display information processed in the mobile terminal 100. For example, when the mobile terminal 100 is in a phone call mode, the display unit 151 can display a user interface (UI) or a graphical user interface (GUI) related to a call or other communication (eg, text messaging, multimedia file download, etc.). When the mobile terminal 100 is in a video call mode or an image capturing mode, the display unit 151 may display a captured image and/or a received image, a UI or GUI showing a video or image and related functions, and the like.
  • UI user interface
  • GUI graphical user interface
  • the display unit 151 can function as an input device and an output device.
  • the display unit 151 may include at least one of a liquid crystal display (LCD), a thin film transistor LCD (TFT-LCD), an organic light emitting diode (OLED) display, a flexible display, a three-dimensional (3D) display, and the like.
  • LCD liquid crystal display
  • TFT-LCD thin film transistor LCD
  • OLED organic light emitting diode
  • a flexible display a three-dimensional (3D) display, and the like.
  • 3D three-dimensional
  • Some of these displays may be configured to be transparent to allow a user to view from the outside, which may be referred to as a transparent display, and a typical transparent display may be, for example, a TOLED (Transparent Organic Light Emitting Diode) display or the like.
  • TOLED Transparent Organic Light Emitting Diode
  • the mobile terminal 100 may include two or more display units (or other display devices), for example, the mobile terminal may include an external display unit (not shown) and an internal display unit (not shown) .
  • the touch screen can be set to detect touch input pressure as well as touch input position and touch input area.
  • the audio output module 152 may convert audio data received by the wireless communication unit 110 or stored in the memory 160 when the mobile terminal is in a call signal receiving mode, a call mode, a recording mode, a voice recognition mode, a broadcast receiving mode, and the like.
  • the audio signal is output as sound.
  • the audio output module 152 can provide a sound related to a specific function performed by the mobile terminal 100. Frequency output (for example, call signal reception sound, message reception sound, etc.).
  • the audio output module 152 can include a speaker, a buzzer, and the like.
  • the alarm unit 153 can provide an output to notify the mobile terminal 100 of the occurrence of an event. Typical events may include call reception, message reception, key signal input, touch input, and the like. In addition to audio or video output, the alert unit 153 can provide an output in a different manner to notify of the occurrence of an event. For example, the alarm unit 153 can provide an output in the form of vibrations, and when a call, message, or some other incoming communication is received, the alarm unit 153 can provide a tactile output (ie, vibration) to notify the user of it. By providing such a tactile output, the user is able to recognize the occurrence of various events even when the user's mobile phone is in the user's pocket. The alarm unit 153 can also provide an output of the notification event occurrence via the display unit 151 or the audio output module 152.
  • the memory 160 may store a software program or the like for processing and control operations performed by the controller 180, or may temporarily store data (for example, a phone book, a message, a still image, a video, etc.) that has been output or is to be output. Moreover, the memory 160 can store data regarding vibrations and audio signals of various manners that are output when a touch is applied to the touch screen.
  • the memory 160 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (eg, SD or DX memory, etc.), a random access memory (RAM), a static random access memory ( SRAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), magnetic memory, magnetic disk, optical disk, and the like.
  • the mobile terminal 100 can cooperate with a network storage device that performs a storage function of the memory 160 through a network connection.
  • the controller 180 typically controls the overall operation of the mobile terminal. For example, the controller 180 performs the control and processing associated with voice calls, data communications, video calls, and the like.
  • the controller 180 may include a multimedia module 181 configured to reproduce (or play back) multimedia data, which may be constructed within the controller 180 or may be configured to be separate from the controller 180.
  • the controller 180 may perform a pattern recognition process to recognize a handwriting input or a picture drawing input performed on the touch screen as a character or an image.
  • the power supply unit 190 receives external power or internal power under the control of the controller 180 and provides appropriate power required to operate the various components and components.
  • the various embodiments described herein can be implemented in a computer readable medium using, for example, computer software, hardware, or any combination thereof.
  • the embodiments described herein may be through the use of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays ( An FPGA, a processor, a controller, a microcontroller, a microprocessor, at least one of the electronic units designed to perform the functions described herein, in some cases, such an embodiment may be at the controller 180 Implemented in the middle.
  • implementations such as procedures or functions may be implemented with separate software modules that permit the execution of at least one function or operation.
  • the software code can be implemented by a software application (or program) written in any suitable programming language, which can be stored in memory 160 and executed by
  • the mobile terminal has been described in terms of its function.
  • a slide type mobile terminal among various types of mobile terminals such as a folding type, a bar type, a swing type, a slide type mobile terminal, and the like will be described as an example. Therefore, the present application can be applied to any type of mobile terminal, and is not limited to a slide type mobile terminal.
  • the mobile terminal 100 as shown in FIG. 1 may be configured to operate using a communication system such as a wired and wireless communication system and a satellite-based communication system that transmits data via frames or packets.
  • a communication system such as a wired and wireless communication system and a satellite-based communication system that transmits data via frames or packets.
  • Such communication systems may use different air interfaces and/or physical layers.
  • air interfaces used by communication systems include, for example, Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Universal Mobile Telecommunications System (UMTS) (in particular, Long Term Evolution (LTE)). ), Global System for Mobile Communications (GSM), etc.
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • GSM Global System for Mobile Communications
  • the following description relates to a CDMA communication system, but such teachings are equally applicable to other types of systems.
  • a CDMA wireless communication system can include a plurality of mobile terminals 100, a plurality of base stations (BS) 270, a base station controller (BSC) 275, and a mobile switching center (MSC) 280.
  • the MSC 280 is configured to interface with a public switched telephone network (PSTN) 290.
  • PSTN public switched telephone network
  • the MSC 280 is also configured to interface with a BSC 275 that can be coupled to the base station 270 via a backhaul line.
  • the backhaul line can be constructed in accordance with any of a number of well known interfaces including, for example, E1/T1, ATM, IP, PPP, Frame Relay, HDSL, ADSL, or xDSL. It will be appreciated that the system as shown in FIG. 2 can include multiple BSCs 275.
  • Each BS 270 can serve one or more partitions (or regions), each of which is covered by a multi-directional antenna or an antenna directed to a particular direction radially away from the BS 270. Alternatively, each partition may be covered by two or more antennas that are set to receive diversity. Each BS 270 can be configured to support multiple frequency allocations, and each frequency allocation has a particular frequency spectrum (eg, 1.25 MHz, 5 MHz, etc.).
  • BS 270 may also be referred to as a Base Transceiver Subsystem (BTS) or other equivalent terminology.
  • BTS Base Transceiver Subsystem
  • the term "base station” can be used to generally refer to a single BSC 275 and at least one BS 270.
  • a base station can also be referred to as a "cell station.”
  • each partition of a particular BS 270 may be referred to as a plurality of cellular stations.
  • a broadcast transmitter (BT) 295 transmits a broadcast signal to the mobile terminal 100 operating within the system.
  • a broadcast receiving module 111 as shown in FIG. 1 is provided at the mobile terminal 100 to receive a broadcast signal transmitted by the BT 295.
  • GPS Global Positioning System
  • the satellite 300 helps locate at least one of the plurality of mobile terminals 100.
  • a plurality of satellites 300 are depicted, but it is understood that useful positioning information can be obtained using any number of satellites.
  • the GPS module 115 as shown in Figure 1 is typically configured to cooperate with the satellite 300 to obtain desired positioning information. Instead of GPS tracking technology or in addition to GPS tracking technology, other techniques that can track the location of the mobile terminal can be used. Additionally, at least one GPS satellite 300 can selectively or additionally process satellite DMB transmissions.
  • BS 270 receives reverse link signals from various mobile terminals 100.
  • Mobile terminal 100 typically participates in calls, messaging, and other types of communications.
  • Each reverse link signal received by a particular base station 270 is processed within a particular BS 270.
  • the obtained data is forwarded to the relevant BSC 275.
  • the BSC provides call resource allocation and coordinated mobility management functions including a soft handoff procedure between the BSs 270.
  • the BSC 275 also routes the received data to the MSC 280, which provides additional routing services for interfacing with the PSTN 290.
  • PSTN 290 interfaces with MSC 280, which forms an interface with BSC 275, and BSC 275 controls BS 270 accordingly to transmit forward link signals to mobile terminal 100.
  • FIG. 3 is a schematic structural diagram of a mobile terminal according to the present application. As shown in FIG. 3, the method includes: an obtaining module 30, a filtering module 31, a first determining module 32, and a calculating module 33. among them,
  • the obtaining module 30 is configured to acquire a brightness value of each pixel included in the focus window in the current frame image.
  • the filtering module 31 is configured to filter the obtained luminance value of each pixel to obtain a filtered value of the luminance value of each pixel.
  • the first determining module 32 is configured to determine a weight value corresponding to each pixel point.
  • the first determining module 32 is configured to:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the first determining module 32 is configured to determine a weight value corresponding to each pixel point according to formula (2):
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a and b both represent constants
  • ⁇ represents the tuning parameter.
  • a, b, ⁇ are the default values of the system settings of the mobile terminal, such as a can be set to 1, b can be set to 2 or 3 or 4, etc., ⁇ can be set according to the needs of the shooting scene, such as the need for edge regions
  • the weight corresponding to the pixel point is lower than the weight corresponding to the pixel point of the middle region, and then the ⁇ is adjusted to be smaller, and vice versa.
  • the calculating module 33 is configured to calculate a focus value of the current frame image according to the obtained filtered value of the brightness value of each pixel point and the determined weight value corresponding to each pixel point.
  • the calculation module 33 is configured to calculate the focus value of the current frame image according to formula (3):
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents a focus window included The total number of pixels.
  • the mobile terminal further includes: a detecting module 34 and a second determining module 35. among them,
  • the detecting module 34 is configured to detect whether there is an external command that meets the preset condition; when detecting that there is an external command that meets the preset condition, send a first notification to the second determining module 35; when the presence of the preset condition is not detected When the external command is issued, the second notification is sent to the second determining module 35; accordingly,
  • the second determining module 35 is configured to receive the first notification from the detecting module 34, obtain the first location information of the external command, determine the focus window according to the obtained location information of the external command, and receive the second notification from the detecting module 34.
  • the preset area is used as the focus window.
  • the first position information of the external command may include a focus position manually selected by a user.
  • the second determining module 35 is configured to determine the focus window according to the obtained position information of the external command by:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and The area covered by the circle or square of the radius is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • c is a default value set by the system of the mobile terminal according to requirements.
  • c can be set to 2 or set to 3.
  • the square includes a rectangle or a square.
  • the focus area when the focus area is a rectangle, Represents half of the short side of the rectangle, the long side of the rectangle is larger than When the circle is oval, Indicates the short axis radius of the ellipse, the long axis radius of the ellipse is greater than
  • the preset area is a geometric center point of the display center of the display screen of the mobile terminal Round or square.
  • the mobile terminal in the optional embodiment includes: a detecting module 34, a second determining module 35, an obtaining module 30, a filtering module 31, a first determining module 32, and a calculating module 33. among them,
  • the detecting module 34 is configured to detect whether there is an external command that meets the preset condition; when detecting that there is an external command that meets the preset condition, send a first notification to the second determining module 35; when the presence of the preset condition is not detected When the external command is issued, the second notification is sent to the second determining module 35.
  • the second determining module 35 is configured to receive the first notification from the detecting module 34, obtain the first location information of the external command, determine the focus window according to the obtained location information of the external command, and receive the second notification from the detecting module 34. , the preset area is used as the focus window.
  • the determining, by the second determining module 35, the focus window according to the obtained location information of the external command includes:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and The area covered by the circle or square of the radius is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • c is a default value set by the system of the mobile terminal according to requirements.
  • c can be set to 2 or set to 3.
  • the square includes a rectangle or a square.
  • the focus area when the focus area is a rectangle, Represents half of the short side of the rectangle, the long side of the rectangle is larger than When the circle is oval, Indicates the short axis radius of the ellipse, the long axis radius of the ellipse is greater than
  • the preset area is a circle or a square of a geometric center point of the geometric center point of the display screen of the mobile terminal.
  • the obtaining module 30 is configured to acquire a brightness value of each pixel included in the focus window in the current frame image.
  • the filtering module 31 is configured to filter the obtained brightness value of each pixel to obtain each The filtered value of the luminance value of each pixel.
  • the first determining module 32 is configured to determine a weight value corresponding to each pixel point.
  • the first determining module 32 is configured to:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the first determining module 32 determines the weight value corresponding to each pixel point according to formula (2):
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a and b both represent constants
  • ⁇ represents the tuning parameter.
  • a, b, ⁇ are the default values of the system settings of the mobile terminal, such as a can be set to 1, b can be set to 2 or 3 or 4, etc., ⁇ can be set according to the needs of the shooting scene, such as the need for edge regions
  • the weight corresponding to the pixel point is lower than the weight corresponding to the pixel point of the middle region, and then the ⁇ is adjusted to be smaller, and vice versa.
  • how to set a, b, and ⁇ is a common technical means well known to those skilled in the art, and is not described herein again, and is not intended to limit the application.
  • the calculating module 33 is configured to calculate a focus value of the current frame image according to the obtained filtered value of the brightness value of each pixel point and the determined weight value corresponding to each pixel point.
  • the calculation module 33 calculates the focus value of the current frame image according to formula (3):
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents a focus window included The total number of pixels.
  • the present application provides a method as shown in FIG. 4 corresponding thereto.
  • FIG. 4 is a flowchart of a method for acquiring a focus value according to the present application. When applied to a focus process, as shown in FIG. 4, the following steps are performed for each frame of image output by the camera:
  • Step 401 The mobile terminal acquires a brightness value of each pixel included in the focus window in the current frame image.
  • the method further includes:
  • the mobile terminal detects whether there is an external command that meets the preset condition; when detecting that there is an external command that meets the preset condition, acquiring the first position information of the external command; determining the focus window according to the obtained position information of the external command;
  • the preset area is used as the focus window.
  • the external instructions that meet the preset conditions include: click operation or double-click operation.
  • determining the focus window according to the obtained position information of the external instruction comprises:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and The area covered by the circle or square of the radius is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • c is a default value set by the system of the mobile terminal according to requirements.
  • c can be set to 2 or set to 3.
  • the square includes a rectangle or a square.
  • the focus area when the focus area is a rectangle, Represents half of the short side of the rectangle, the long side of the rectangle is larger than When the circle is oval, Indicates the short axis radius of the ellipse, the long axis radius of the ellipse is greater than
  • L may be the side length of the left and right sides of the display screen of the mobile terminal; as shown in FIG. 5( b ), L may also be the upper and lower sides of the display screen of the mobile terminal. The side of the side is long.
  • the preset area is a circle or a square of a geometric center point of the geometric center point of the display screen of the mobile terminal.
  • Step 402 Filter the obtained luminance values of each pixel to obtain a filtered value of the luminance value of each pixel.
  • Step 403 Determine a weight value corresponding to each pixel point.
  • step 403 includes:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • weight value corresponding to each pixel point is determined according to formula (2):
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a and b both represent constants
  • ⁇ indicates tuning the tuning parameter.
  • a, b, ⁇ are the default values of the system settings of the mobile terminal, such as a can be set to 1, b can be set to 2 or 3 or 4, etc., ⁇ can be set according to the needs of the shooting scene, such as the need for edge regions
  • the weight corresponding to the pixel point is lower than the weight corresponding to the pixel point of the middle region, and then the ⁇ is adjusted to be smaller, and vice versa.
  • the method further includes:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the second location information includes multiple, that is, several pixel points have several second location information, and several second location information have several fourth location information.
  • Step 404 Calculate a focus value of the current frame image according to the obtained filtered value of the brightness value of each pixel point and the determined weight value corresponding to each pixel point.
  • the focus value of the current frame image is calculated according to formula (3):
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents a focus window included The total number of pixels.
  • the smaller ⁇ (i) (ie, the closer to the geometric center point), the larger w(i), the larger ⁇ (i) (ie, the further away from the geometric center point), w(i) The smaller, the weight of the filter value closer to the geometric center point can be increased, and the weight of the filter value farther from the geometric center point (edge area) can be reduced, thereby reducing the influence of the background image of the edge, effectively avoiding Misjudgment caused by the off-center of the focusing object.
  • the focus value of the current frame image is calculated by determining the weight value corresponding to each pixel point, and the filtered value of the brightness value of each pixel point obtained and the determined weight value corresponding to each pixel point. , which improves the accuracy of focusing and improves the user experience.
  • the present application provides a method as shown in FIG. 6 corresponding thereto.
  • FIG. 6 is a flowchart of an embodiment of a method for acquiring a focus value according to the present application. When applied to a focus process, as shown in FIG. 6, the method includes:
  • Step 600 The mobile terminal detects whether there is an external command that meets the preset condition. When it is detected that there is an external command that meets the preset condition, the process proceeds to step 601; when it is not detected that there is an external command that meets the preset condition, the process proceeds to step 603.
  • the external instructions that meet the preset conditions include: click operation or double-click operation.
  • Step 601 Acquire first location information of the external instruction.
  • Step 602 Determine a focus window according to the obtained position information of the external instruction, and perform step 604.
  • Step 602 includes:
  • the pixel corresponding to the position information of the obtained external instruction is a geometric center point, and The area covered by the circle or square of the radius is used as the focus area;
  • L is the side length of the display screen of the mobile terminal; c is a natural number greater than one.
  • c is a default value set by the system of the mobile terminal according to requirements.
  • c can be set to 2 or set to 3.
  • the square includes a rectangle or a square.
  • the focus area when the focus area is a rectangle, Represents half of the short side of the rectangle, the long side of the rectangle is larger than When the circle is oval, Indicates the short axis radius of the ellipse, the long axis radius of the ellipse is greater than
  • L may be the side length of the left and right sides of the display screen of the mobile terminal; as shown in FIG. 5( b ), L may also be the upper and lower sides of the display screen of the mobile terminal. The side of the side is long.
  • Step 603 The preset area is used as a focus window.
  • the preset area is a circle or a square of a geometric center point of the geometric center point of the display screen of the mobile terminal.
  • Step 604 The mobile terminal acquires a brightness value of each pixel included in the focus window in the current frame image.
  • Step 605 Filter the obtained luminance value of each pixel to obtain a filtered value of the luminance value of each pixel.
  • Step 606 Determine a weight value corresponding to each pixel.
  • step 606 includes:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • weight value corresponding to each pixel point is determined according to formula (2):
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a and b both represent constants
  • ⁇ indicates tuning the tuning parameter.
  • a, b, ⁇ are the default values of the system settings of the mobile terminal, such as a can be set to 1, b can be set to 2 or 3 or 4, etc., ⁇ can be set according to the needs of the shooting scene, such as the need for edge regions
  • the weight corresponding to the pixel point is lower than the weight corresponding to the pixel point of the middle region, and then the ⁇ is adjusted to be smaller, and vice versa.
  • the method further includes:
  • the third position information of the geometric center point of the obtained focusing window is coordinate system conversion for the coordinate origin, and the plurality of fourth position signals corresponding to the second position information after the plurality of coordinate system conversions are acquired. interest;
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the second location information includes multiple, that is, several pixel points have several second location information, and several second location information have several fourth location information.
  • the second location information includes multiple, that is, there are several pixel locations and several second location information.
  • Step 607 Calculate a focus value of the current frame image according to the obtained filtered value of the luminance value of each pixel point and the determined weight value corresponding to each pixel point.
  • the focus value of the current frame image is calculated according to formula (3):
  • FV represents a focus value of the current frame image
  • w(i) represents a weight value corresponding to the i-th pixel point
  • Q(i) represents a filtered value of the luminance value of the i-th pixel point
  • n represents a focus window included The total number of pixels.
  • the smaller ⁇ (i) (ie, the closer to the geometric center point), the larger w(i), the larger ⁇ (i) (ie, the further away from the geometric center point), w(i) The smaller, the weight of the filter value closer to the geometric center point can be increased, and the weight of the filter value farther from the geometric center point (edge area) can be reduced, thereby reducing the influence of the background image of the edge, effectively avoiding Misjudgment caused by the off-center of the focusing object.
  • the embodiment of the invention further provides a mobile terminal, including:
  • Memory set to store instructions
  • a processor arranged to execute the instructions, to implement the steps of the method of acquiring a focus value as described above.
  • the memory may be the memory 160 of the mobile terminal of FIG. 1; the processor may be disposed in the controller 180 of the mobile terminal of FIG.
  • Embodiments of the present invention also provide a computer readable storage medium having a computer stored thereon a program that, when executed by a processor, implements the following steps:
  • the focus value of the current frame image is calculated according to the obtained filtered value of the luminance value of each pixel and the determined weight value corresponding to each pixel.
  • the preset area is used as the focus window.
  • the computer program is executed by the processor to determine a weight value corresponding to each pixel point in the following manner:
  • the weight value corresponding to each pixel point is determined according to the calculated distance.
  • the focus value of the current frame image is calculated in the following manner:
  • FV represents a focus value of the current frame image
  • w(i) represents a weight corresponding to the i-th pixel point Value
  • Q(i) represents the filtered value of the luminance value of the i-th pixel point
  • n represents the total number of pixel points included in the focus window.
  • w(i) represents the weight value corresponding to the i-th pixel point
  • ⁇ (i) represents the distance between the i-th pixel point and the geometric center point of the focus window
  • exp represents an exponential function
  • a, b are both Represents a constant
  • ⁇ indicates tuning the tuning parameter.
  • each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, being executed by a processor and stored in a memory. Programs/instructions to implement their respective functions.
  • the invention is not limited to any specific form of combination of hardware and software.
  • the embodiment of the invention obtains the brightness value of each pixel included in the focus window in the current frame image; filters the obtained brightness value of each pixel to obtain a filter value of the brightness value of each pixel; A weight value corresponding to each pixel point; a focus value of the current frame image is calculated according to the obtained filtered value of the luminance value of each pixel point and the determined weight value corresponding to each pixel point.
  • the embodiment of the invention improves the accuracy of focusing and improves the user experience.

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Abstract

一种移动终端和获取对焦值的方法，该方法包括：移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；确定每个像素点对应的权重值；根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。

Description

一种移动终端、获取对焦值的方法以及计算机可读存储介质 技术领域
本文涉及但不限于智能终端技术，尤指一种移动终端、获取对焦值的方法以及计算机可读存储介质。
背景技术
在支持自动对焦的移动终端中，找出图像最清晰时对应的像距的过程称为对焦。其中，对焦过程包括以下步骤：
首先，获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
其次，对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
接着，按照公式(1)计算当前帧图像的对焦值(FV，Focus Value)(或称为对比度值)并记录与FV对应的当前镜头位置：
Figure PCTCN2017092693-appb-000001
其中，FV表示当前帧图像的对焦值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量；
最后，在所有的FV中选出最大的FV，其对应的镜头位置即为最清晰位置。
但是，上述对焦过程中，如果对焦窗口太大，对焦窗口中背景图像的比重增大，影响对焦值的准确性；如果对焦窗口过小，目标对象(需要对焦的对象)容易偏离窗口，也会影响对焦值的准确性。因此，如何提高对焦值的准确性成为亟需解决的问题。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本申请提供了一种移动终端和获取对焦值的方法，能够提高对焦的准确性，提升用户体验。
本发明实施例提供了一种移动终端，包括：获取模块、滤波模块、第一确定模块和计算模块；其中，
获取模块，设置为获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
滤波模块，设置为对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
第一确定模块，设置为确定每个像素点对应的权重值；
计算模块，设置为根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
可选地，该移动终端还包括：检测模块和第二确定模块；其中，
所述检测模块，设置为检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，向所述第二确定模块发送第一通知；当未检测到存在符合预设条件的外部指令时，向所述第二确定模块发送第二通知；相应地，
所述第二确定模块，设置为接收到来自所述检测模块的第一通知，获取外部指令的第一位置信息；根据获得的外部指令的位置信息确定所述对焦窗口；接收到来自所述检测模块的第二通知，将预设区域作为所述对焦窗口。
可选地，所述第一确定模块是设置为通过如下方式实现确定每个像素点对应的权重值：
确定所述对焦窗口的几何中心点；
获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
根据计算出的距离确定所述每个像素点对应的权重值。
可选地，所述计算模块是设置为通过如下方式计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000002
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
可选地，所述第一确定模块是设置为通过如下方式确定所述每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000003
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
可选的，所述第二确定模块是设置为通过如下方式实现根据获得的外部指令的第一位置信息确定所述对焦窗口：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000004
为半径的圆形或以
Figure PCTCN2017092693-appb-000005
为边长的方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
可选的，所述方形包括长方形或正方形；
当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000006
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000007
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000008
表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000009
本发明实施例还提供了一种获取对焦值的方法，应用于对焦过程中，包括：
移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
确定每个像素点对应的权重值；
根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
可选地，在所述获取对焦窗口所包含的每个像素点的亮度值之前，该方法还包括：
所述移动终检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；
当未检测到存在符合预设条件的外部指令时，将预设区域作为所述对焦窗口。
可选地，所述确定每个像素点对应的权重值包括：
确定所述对焦窗口的几何中心点；
获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
根据计算出的距离确定所述每个像素点对应的权重值。
可选地，根据以下公式计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000010
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
可选地，根据以下公式确定所述每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000011
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
可选的，根据获得的外部指令的第一位置信息确定所述对焦窗口包括：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000012
为半径的圆形或以
Figure PCTCN2017092693-appb-000013
为边长的方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
可选的，所述方形包括长方形或正方形；
当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000014
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000015
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000016
表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000017
本发明实施例还提供了一种移动终端，包括：
存储器，设置为存储指令；
处理器，设置为执行所述指令，实现上述的获取对焦值方法的步骤。
本发明实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现以下步骤：
获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
确定每个像素点对应的权重值；
根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
可选的，所述计算机程序被处理器执行时还实现以下步骤：
在所述获取对焦窗口所包含的每个像素点的亮度值之前，检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；
当未检测到存在符合预设条件的外部指令时，将预设区域作为所述对焦窗口。
可选的，所述计算机程序被处理器执行时采用以下方式实现确定每个像素点对应的权重值：
确定所述对焦窗口的几何中心点；
获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
根据计算出的距离确定所述每个像素点对应的权重值。
可选的，所述计算机程序被处理器执行时采用以下方式实现计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000018
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
可选的，所述计算机程序被处理器执行时采用以下方式实现确定所述每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000019
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
本发明实施例包括：移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；确定每个像素点对应的权重值；根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。本发明实施例提高了对焦的准确性，提升了用户体验。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为实现本申请各个实施例一个可选的移动终端的硬件结构示意图；
图2为支持本申请移动终端之间进行通信的通信系统的示意图；
图3为本申请移动终端的结构示意图；
图4为本申请获取对焦值的方法的流程图；
图5(a)为本申请移动终端的显示屏幕的侧边的示意图一；
图5(b)为本申请移动终端的显示屏幕的侧边的示意图二；
图6为本申请获取对焦值的方法的实施例的流程图。
本发明的实施方式
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。
现在将参考附图描述实现本申请各个实施例的移动终端。在后续的描述 中，使用设置为表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本发明的说明，其本身并没有特定的意义。因此，"模块"与"部件"可以混合地使用。
移动终端可以以各种形式来实施。例如，本发明实施例中描述的终端可以包括诸如移动电话、智能电话、笔记本电脑、数字广播接收器、PDA(个人数字助理)、PAD(平板电脑)、PMP(便携式多媒体播放器)、导航装置等等的移动终端以及诸如数字TV、台式计算机等等的固定终端。下面，假设终端是移动终端。然而，本领域技术人员将理解的是，除了特别用于移动目的的元件之外，根据本发明的实施方式的构造也能够应用于固定类型的终端。
图1为实现本申请各个实施例一个可选的移动终端的硬件结构示意图。
移动终端100可以包括无线通信单元110、A/V(音频/视频)输入单元120、用户输入单元130、感测单元140、输出单元150、存储器160、接口单元170、控制器180和电源单元190等等。图1示出了具有各种组件的移动终端，但是应理解的是，并不要求实施所有示出的组件。可以替代地实施更多或更少的组件。将在下面详细描述移动终端的元件。
无线通信单元110通常包括一个或多个组件，其允许移动终端100与无线通信系统或网络之间的无线电通信。例如，无线通信单元可以包括广播接收模块111、移动通信模块112、无线互联网模块113、短程通信模块114和位置信息模块115中的至少一个。
广播接收模块111经由广播信道从外部广播管理服务器接收广播信号和/或广播相关信息。广播信道可以包括卫星信道和/或地面信道。广播管理服务器可以是生成并发送广播信号和/或广播相关信息的服务器或者接收之前生成的广播信号和/或广播相关信息并且将其发送给终端的服务器。广播信号可以包括TV广播信号、无线电广播信号、数据广播信号等等。而且，广播信号可以进一步包括与TV或无线电广播信号组合的广播信号。广播相关信息也可以经由移动通信网络提供，并且在该情况下，广播相关信息可以由移动通信模块112来接收。广播信号可以以各种形式存在，例如，其可以以数字多媒体广播(DMB)的电子节目指南(EPG)、数字视频广播手持(DVB-H) 的电子服务指南(ESG)等等的形式而存在。广播接收模块111可以通过使用各种类型的广播系统接收信号广播。特别地，广播接收模块111可以通过使用诸如多媒体广播-地面(DMB-T)、数字多媒体广播-卫星(DMB-S)、数字视频广播-手持(DVB-H)，前向链路媒体(MediaFLO@)的数据广播系统、地面数字广播综合服务(ISDB-T)等等的数字广播系统接收数字广播。广播接收模块111可以被构造为适合提供广播信号的各种广播系统以及上述数字广播系统。经由广播接收模块111接收的广播信号和/或广播相关信息可以存储在存储器160(或者其它类型的存储介质)中。
移动通信模块112将无线电信号发送到基站(例如，接入点、节点B等等)、外部终端以及服务器中的至少一个和/或从其接收无线电信号。这样的无线电信号可以包括语音通话信号、视频通话信号、或者根据文本和/或多媒体消息发送和/或接收的各种类型的数据。
无线互联网模块113支持移动终端的无线互联网接入。该模块可以内部或外部地耦接到终端。该模块所涉及的无线互联网接入技术可以包括WLAN(无线LAN)(Wi-Fi)、Wibro(无线宽带)、Wimax(全球微波互联接入)、HSDPA(高速下行链路分组接入)等等。
短程通信模块114是设置为支持短程通信的模块。短程通信技术的一些示例包括蓝牙TM、射频识别(RFID)、红外数据协会(IrDA)、超宽带(UWB)、紫蜂TM等等。
位置信息模块115是设置为检查或获取移动终端的位置信息的模块。位置信息模块的典型示例是GPS(全球定位系统)。根据当前的技术，GPS模块115计算来自三个或更多卫星的距离信息和准确的时间信息并且对于计算的信息应用三角测量法，从而根据经度、纬度和高度准确地计算三维当前位置信息。当前，用于计算位置和时间信息的方法使用三颗卫星并且通过使用另外的一颗卫星校正计算出的位置和时间信息的误差。此外，GPS模块115能够通过实时地连续计算当前位置信息来计算速度信息。
A/V输入单元120设置为接收音频或视频信号。A/V输入单元120可以包括相机121和麦克风122，相机121对在视频捕获模式或图像捕获模式中由图像捕获装置获得的静态图片或视频的图像数据进行处理。处理后的图像 帧可以显示在显示单元151上。经相机121处理后的图像帧可以存储在存储器160(或其它存储介质)中或者经由无线通信单元110进行发送，可以根据移动终端的构造提供两个或更多相机121。麦克风122可以在电话通话模式、记录模式、语音识别模式等等运行模式中经由麦克风接收声音(音频数据)，并且能够将这样的声音处理为音频数据。处理后的音频(语音)数据可以在电话通话模式的情况下转换为可经由移动通信模块112发送到移动通信基站的格式输出。麦克风122可以实施各种类型的噪声消除(或抑制)算法以消除(或抑制)在接收和发送音频信号的过程中产生的噪声或者干扰。
用户输入单元130可以根据用户输入的命令生成键输入数据以控制移动终端的各种操作。用户输入单元130允许用户输入各种类型的信息，并且可以包括键盘、锅仔片、触摸板(例如，检测由于被接触而导致的电阻、压力、电容等等的变化的触敏组件)、滚轮、摇杆等等。特别地，当触摸板以层的形式叠加在显示单元151上时，可以形成触摸屏。
感测单元140检测移动终端100的当前状态，(例如，移动终端100的打开或关闭状态)、移动终端100的位置、用户对于移动终端100的接触(即，触摸输入)的有无、移动终端100的取向、移动终端100的加速或减速移动和方向等等，并且生成用于控制移动终端100的操作的命令或信号。例如，当移动终端100实施为滑动型移动电话时，感测单元140可以感测该滑动型电话是打开还是关闭。另外，感测单元140能够检测电源单元190是否提供电力或者接口单元170是否与外部装置耦接。
接口单元170用作至少一个外部装置与移动终端100连接可以通过的接口。例如，外部装置可以包括有线或无线头戴式耳机端口、外部电源(或电池充电器)端口、有线或无线数据端口、存储卡端口、设置为连接具有识别模块的装置的端口、音频输入/输出(I/O)端口、视频I/O端口、耳机端口等等。识别模块可以是存储用于验证用户使用移动终端100的各种信息并且可以包括用户识别模块(UIM)、客户识别模块(SIM)、通用客户识别模块(USIM)等等。另外，具有识别模块的装置(下面称为"识别装置")可以采取智能卡的形式，因此，识别装置可以经由端口或其它连接装置与移动终端100连接。接口单元170可以设置为接收来自外部装置的输入(例如，数 据信息、电力等等)并且将接收到的输入传输到移动终端100内的一个或多个元件或者可以设置为在移动终端和外部装置之间传输数据。
另外，当移动终端100与外部底座连接时，接口单元170可以用作允许通过其将电力从底座提供到移动终端100的路径或者可以用作允许从底座输入的各种命令信号通过其传输到移动终端的路径。从底座输入的各种命令信号或电力可以用作用于识别移动终端是否准确地安装在底座上的信号。输出单元150被构造为以视觉、音频和/或触觉方式提供输出信号(例如，音频信号、视频信号、警报信号、振动信号等等)。输出单元150可以包括显示单元151、音频输出模块152、警报单元153等等。
显示单元151可以显示在移动终端100中处理的信息。例如，当移动终端100处于电话通话模式时，显示单元151可以显示与通话或其它通信(例如，文本消息收发、多媒体文件下载等等)相关的用户界面(UI)或图形用户界面(GUI)。当移动终端100处于视频通话模式或者图像捕获模式时，显示单元151可以显示捕获的图像和/或接收的图像、示出视频或图像以及相关功能的UI或GUI等等。
同时，当显示单元151和触摸板以层的形式彼此叠加以形成触摸屏时，显示单元151可以用作输入装置和输出装置。显示单元151可以包括液晶显示器(LCD)、薄膜晶体管LCD(TFT-LCD)、有机发光二极管(OLED)显示器、柔性显示器、三维(3D)显示器等等中的至少一种。这些显示器中的一些可以被构造为透明状以允许用户从外部观看，这可以称为透明显示器，典型的透明显示器可以例如为TOLED(透明有机发光二极管)显示器等等。根据特定想要的实施方式，移动终端100可以包括两个或更多显示单元(或其它显示装置)，例如，移动终端可以包括外部显示单元(未示出)和内部显示单元(未示出)。触摸屏可设置为检测触摸输入压力以及触摸输入位置和触摸输入面积。
音频输出模块152可以在移动终端处于呼叫信号接收模式、通话模式、记录模式、语音识别模式、广播接收模式等等模式下时，将无线通信单元110接收的或者在存储器160中存储的音频数据转换音频信号并且输出为声音。而且，音频输出模块152可以提供与移动终端100执行的特定功能相关的音 频输出(例如，呼叫信号接收声音、消息接收声音等等)。音频输出模块152可以包括扬声器、蜂鸣器等等。
警报单元153可以提供输出以将事件的发生通知给移动终端100。典型的事件可以包括呼叫接收、消息接收、键信号输入、触摸输入等等。除了音频或视频输出之外，警报单元153可以以不同的方式提供输出以通知事件的发生。例如，警报单元153可以以振动的形式提供输出，当接收到呼叫、消息或一些其它进入通信(incoming communication)时，警报单元153可以提供触觉输出(即，振动)以将其通知给用户。通过提供这样的触觉输出，即使在用户的移动电话处于用户的口袋中时，用户也能够识别出各种事件的发生。警报单元153也可以经由显示单元151或音频输出模块152提供通知事件的发生的输出。
存储器160可以存储由控制器180执行的处理和控制操作的软件程序等等，或者可以暂时地存储己经输出或将要输出的数据(例如，电话簿、消息、静态图像、视频等等)。而且，存储器160可以存储关于当触摸施加到触摸屏时输出的各种方式的振动和音频信号的数据。
存储器160可以包括至少一种类型的存储介质，所述存储介质包括闪存、硬盘、多媒体卡、卡型存储器(例如，SD或DX存储器等等)、随机访问存储器(RAM)、静态随机访问存储器(SRAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、可编程只读存储器(PROM)、磁性存储器、磁盘、光盘等等。而且，移动终端100可以与通过网络连接执行存储器160的存储功能的网络存储装置协作。
控制器180通常控制移动终端的总体操作。例如，控制器180执行与语音通话、数据通信、视频通话等等相关的控制和处理。另外，控制器180可以包括设置为再现(或回放)多媒体数据的多媒体模块181，多媒体模块181可以构造在控制器180内，或者可以构造为与控制器180分离。控制器180可以执行模式识别处理，以将在触摸屏上执行的手写输入或者图片绘制输入识别为字符或图像。
电源单元190在控制器180的控制下接收外部电力或内部电力并且提供操作各元件和组件所需的适当的电力。
这里描述的各种实施方式可以以使用例如计算机软件、硬件或其任何组合的计算机可读介质来实施。对于硬件实施，这里描述的实施方式可以通过使用特定用途集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理装置(DSPD)、可编程逻辑装置(PLD)、现场可编程门阵列(FPGA)、处理器、控制器、微控制器、微处理器、被设计为执行这里描述的功能的电子单元中的至少一种来实施，在一些情况下，这样的实施方式可以在控制器180中实施。对于软件实施，诸如过程或功能的实施方式可以与允许执行至少一种功能或操作的单独的软件模块来实施。软件代码可以由以任何适当的编程语言编写的软件应用程序(或程序)来实施，软件代码可以存储在存储器160中并且由控制器180执行。
至此，己经按照其功能描述了移动终端。下面，为了简要起见，将描述诸如折叠型、直板型、摆动型、滑动型移动终端等等的各种类型的移动终端中的滑动型移动终端作为示例。因此，本申请能够应用于任何类型的移动终端，并且不限于滑动型移动终端。
如图1中所示的移动终端100可以被构造为利用经由帧或分组发送数据的诸如有线和无线通信系统以及基于卫星的通信系统来操作。
现在将参考图2描述其中根据本申请的移动终端能够操作的通信系统。
这样的通信系统可以使用不同的空中接口和/或物理层。例如，由通信系统使用的空中接口包括例如频分多址(FDMA)、时分多址(TDMA)、码分多址(CDMA)和通用移动通信系统(UMTS)(特别地，长期演进(LTE))、全球移动通信系统(GSM)等等。作为非限制性示例，下面的描述涉及CDMA通信系统，但是这样的教导同样适用于其它类型的系统。
参考图2，CDMA无线通信系统可以包括多个移动终端100、多个基站(BS)270、基站控制器(BSC)275和移动交换中心(MSC)280。MSC280被构造为与公共电话交换网络(PSTN)290形成接口。MSC280还被构造为与可以经由回程线路耦接到基站270的BSC275形成接口。回程线路可以根据若干己知的接口中的任一种来构造，所述接口包括例如E1/T1、ATM，IP、PPP、帧中继、HDSL、ADSL或xDSL。将理解的是，如图2中所示的系统可以包括多个BSC275。
每个BS270可以服务一个或多个分区(或区域)，由多向天线或指向特定方向的天线覆盖的每个分区放射状地远离BS270。或者，每个分区可以由设置为分集接收的两个或更多天线覆盖。每个BS270可以被构造为支持多个频率分配，并且每个频率分配具有特定频谱(例如，1.25MHz,5MHz等等)。
分区与频率分配的交叉可以被称为CDMA信道。BS270也可以被称为基站收发器子系统(BTS)或者其它等效术语。在这样的情况下，术语"基站"可以用于笼统地表示单个BSC275和至少一个BS270。基站也可以被称为"蜂窝站"。或者，特定BS270的各分区可以被称为多个蜂窝站。
如图2中所示，广播发射器(BT)295将广播信号发送给在系统内操作的移动终端100。如图1中所示的广播接收模块111被设置在移动终端100处以接收由BT295发送的广播信号。在图2中，示出了几个全球定位系统(GPS)卫星300。卫星300帮助定位多个移动终端100中的至少一个。
在图2中，描绘了多个卫星300，但是理解的是，可以利用任何数目的卫星获得有用的定位信息。如图1中所示的GPS模块115通常被构造为与卫星300配合以获得想要的定位信息。替代GPS跟踪技术或者在GPS跟踪技术之外，可以使用可以跟踪移动终端的位置的其它技术。另外，至少一个GPS卫星300可以选择性地或者额外地处理卫星DMB传输。
作为无线通信系统的一个典型操作，BS270接收来自各种移动终端100的反向链路信号。移动终端100通常参与通话、消息收发和其它类型的通信。特定基站270接收的每个反向链路信号被在特定BS270内进行处理。获得的数据被转发给相关的BSC275。BSC提供通话资源分配和包括BS270之间的软切换过程的协调的移动管理功能。BSC275还将接收到的数据路由到MSC280，其提供用于与PSTN290形成接口的额外的路由服务。类似地，PSTN290与MSC280形成接口，MSC与BSC275形成接口，并且BSC275相应地控制BS270以将正向链路信号发送到移动终端100。
基于上述移动终端硬件结构以及通信系统，提出本申请方法各个实施例。
图3为本申请移动终端的结构示意图，如图3所示，包括：获取模块30、滤波模块31、第一确定模块32和计算模块33。其中，
获取模块30，设置为获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值。
滤波模块31，设置为对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值。
第一确定模块32，设置为确定每个像素点对应的权重值。
其中，第一确定模块32是设置为：
确定对焦窗口的几何中心点；
获取对焦窗口所包含的每个像素点的第二位置信息，以及对焦窗口的几何中心点的第三位置信息；
根据获得的第二位置信息和第三位置信息分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
其中，第一确定模块32是设置为根据公式(2)确定每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000020
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐(tuning)参数。
其中，a、b、δ均是移动终端的系统设置的默认值，如a可以设置为1，b可以设置为2或3或4等，δ可以根据拍摄场景的需求进行设置，如需要边缘区域的像素点对应的权重相对中间区域的像素点对应的权重更低，则调小δ，反之则调大δ。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大；ρ(i)越大(即距几何中心点越远)，w(i)就越小。
计算模块33，设置为根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
其中，计算模块33是设置为根据公式(3)计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000021
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示对焦窗口所包含的像素点的总数量。
可选地，该移动终端还包括：检测模块34和第二确定模块35。其中，
检测模块34，设置为检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，向第二确定模块35发送第一通知；当未检测到存在符合预设条件的外部指令时，向第二确定模块35发送第二通知；相应地，
第二确定模块35，设置为接收到来自检测模块34的第一通知，获取外部指令的第一位置信息；根据获得的外部指令的位置信息确定对焦窗口；接收到来自检测模块34的第二通知，将预设区域作为对焦窗口。所述外部指令的第一位置信息可以包括用户手动选择的对焦位置。
其中，第二确定模块35是设置为通过如下方式实现根据获得的外部指令的位置信息确定对焦窗口：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000022
为半径的圆形或方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
需要说明的是，c是移动终端的系统根据需求设置的默认值，例如，c可以设置为2，也可以设置为3。
其中，方形包括长方形或正方形。
其中，当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000023
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000024
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000025
表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000026
其中，预设区域以移动终端的显示屏幕的几何中心点为几何中心点的 圆形或方形。
可选实施例，该可选实施例中的移动终端包括：检测模块34、第二确定模块35、获取模块30、滤波模块31、第一确定模块32和计算模块33。其中，
检测模块34，设置为检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，向第二确定模块35发送第一通知；当未检测到存在符合预设条件的外部指令时，向第二确定模块35发送第二通知。
第二确定模块35，设置为接收到来自检测模块34的第一通知，获取外部指令的第一位置信息；根据获得的外部指令的位置信息确定对焦窗口；接收到来自检测模块34的第二通知，将预设区域作为对焦窗口。
其中，第二确定模块35根据获得的外部指令的位置信息确定对焦窗口包括：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000027
为半径的圆形或方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
需要说明的是，c是移动终端的系统根据需求设置的默认值，例如，c可以设置为2，也可以设置为3。
其中，方形包括长方形或正方形。
其中，当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000028
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000029
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000030
表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000031
其中，预设区域以移动终端的显示屏幕的几何中心点为几何中心点的圆形或方形。
获取模块30，设置为获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值。
滤波模块31，设置为对获得的每个像素点的亮度值进行滤波以获取每 个像素点的亮度值的滤波值。
第一确定模块32，设置为确定每个像素点对应的权重值。
其中，第一确定模块32是设置为：
确定对焦窗口的几何中心点；
获取对焦窗口所包含的每个像素点的第二位置信息，以及对焦窗口的几何中心点的第三位置信息；
根据获得的第二位置信息和第三位置信息分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
其中，第一确定模块32根据公式(2)确定每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000032
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐(tuning)参数。
其中，a、b、δ均是移动终端的系统设置的默认值，如a可以设置为1，b可以设置为2或3或4等，δ可以根据拍摄场景的需求进行设置，如需要边缘区域的像素点对应的权重相对中间区域的像素点对应的权重更低，则调小δ，反之则调大δ。需要说明的是，关于如何设置a、b、δ属于本领域技术人员所熟知的惯用技术手段，此处不再赘述，并不用来限制本申请。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大；ρ(i)越大(即距几何中心点越远)，w(i)就越小。
计算模块33，设置为根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
其中，计算模块33根据公式(3)计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000033
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示对焦窗口所包含的像素点的总数量。
针对图3所示的移动终端，本申请提供了与之对应的如图4所示的方法。
图4为本申请获取对焦值的方法的流程图，应用于对焦过程中，如图4所示，针对于摄像头输出的每帧图像均执行以下步骤：
步骤401：移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值。
可选地，在步骤401之前，该方法还包括：
移动终检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的位置信息确定对焦窗口；
当未检测到存在符合预设条件的外部指令时，将预设区域作为对焦窗口。
其中，符合预设条件的外部指令包括：单击操作或双击操作。
其中，根据获得的外部指令的位置信息确定对焦窗口包括：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000034
为半径的圆形或方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
需要说明的是，c是移动终端的系统根据需求设置的默认值，例如，c可以设置为2，也可以设置为3。
其中，方形包括长方形或正方形。
其中，当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000035
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000036
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000037
表示的是该椭圆形的短轴 半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000038
如图5(a)所示，L可以是移动终端的显示屏幕的左、右侧边的边长；如图5(b)所示，L也可以是移动终端的显示屏幕的上、下侧边的边长。
其中，预设区域以移动终端的显示屏幕的几何中心点为几何中心点的圆形或方形。
步骤402：对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值。
步骤403：确定每个像素点对应的权重值。
其中，步骤403包括：
确定对焦窗口的几何中心点；
获取对焦窗口所包含的每个像素点的第二位置信息，以及对焦窗口的几何中心点的第三位置信息；
根据获得的第二位置信息和第三位置信息分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
其中，根据公式(2)确定每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000039
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
其中，a、b、δ均是移动终端的系统设置的默认值，如a可以设置为1，b可以设置为2或3或4等，δ可以根据拍摄场景的需求进行设置，如需要边缘区域的像素点对应的权重相对中间区域的像素点对应的权重更低，则调小δ，反之则调大δ。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大；ρ(i)越大(即距几何中心点越远)，w(i)就越小。
可选地，在分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离之前，在获取对焦窗口的几何中心点的第三位置信息之后，该方法还包括：
以获得的对焦窗口的几何中心点的第三位置信息为坐标原点进行坐标系转换，获取多个坐标系转换后的第二位置信息对应的多个第四位置信息；
分别计算多个第四位置信息与坐标原点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
需要说明的是，第二位置信息包括多个，即有几个像素点就有几个第二位置信息，有几个第二位置信息就有几个第四位置信息。
步骤404：根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
其中，根据公式(3)计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000040
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示对焦窗口所包含的像素点的总数量。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大，ρ(i)越大(即距几何中心点越远)，w(i)就越小，这样就可以实现增加距几何中心点近的滤波值的权重，减小距几何中心点远(边缘区域)的滤波值的权重，从而降低了边缘的背景图像的影响，有效的避免了对焦物体偏离中心导致的误判。
本申请实施方式中，通过确定每个像素点对应的权重值，以及根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值，从而提高了对焦的准确性，提升了用户体验。
针对较佳实施例中的移动终端，本申请提供了与之对应的如图6所示的方法。
图6为本申请获取对焦值的方法的实施例的流程图，应用于对焦过程中，如图6所示，包括：
步骤600：移动终检测是否存在符合预设条件的外部指令。当检测到存在符合预设条件的外部指令时，转入步骤601；当未检测到存在符合预设条件的外部指令时，转入步骤603。
其中，符合预设条件的外部指令包括：单击操作或双击操作。
步骤601：获取外部指令的第一位置信息。
步骤602：根据获得的外部指令的位置信息确定对焦窗口，执行步骤604。
步骤602包括：
将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
Figure PCTCN2017092693-appb-000041
为半径的圆形或方形所覆盖的区域作为对焦区域；
其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
需要说明的是，c是移动终端的系统根据需求设置的默认值，例如，c可以设置为2，也可以设置为3。
其中，方形包括长方形或正方形。
其中，当对焦区域是长方形时，
Figure PCTCN2017092693-appb-000042
表示的是该长方形的短边的一半，该长方形的长边大于
Figure PCTCN2017092693-appb-000043
当圆形是椭圆形时，
Figure PCTCN2017092693-appb-000044
表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
Figure PCTCN2017092693-appb-000045
如图5(a)所示，L可以是移动终端的显示屏幕的左、右侧边的边长；如图5(b)所示，L也可以是移动终端的显示屏幕的上、下侧边的边长。
步骤603：将预设区域作为对焦窗口。
其中，预设区域以移动终端的显示屏幕的几何中心点为几何中心点的圆形或方形。
步骤604：移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值。
步骤605：对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值。
步骤606：确定每个像素点对应的权重值。
其中，步骤606包括：
确定对焦窗口的几何中心点；
获取对焦窗口所包含的每个像素点的第二位置信息，以及对焦窗口的几何中心点的第三位置信息；
根据获得的第二位置信息和第三位置信息分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
其中，根据公式(2)确定每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000046
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
其中，a、b、δ均是移动终端的系统设置的默认值，如a可以设置为1，b可以设置为2或3或4等，δ可以根据拍摄场景的需求进行设置，如需要边缘区域的像素点对应的权重相对中间区域的像素点对应的权重更低，则调小δ，反之则调大δ。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大；ρ(i)越大(即距几何中心点越远)，w(i)就越小。
可选地，在分别计算对焦窗口所包含的每个像素点与对焦窗口的几何中心点之间的距离之前，在获取对焦窗口的几何中心点的第三位置信息之后，该方法还包括：
以获得的对焦窗口的几何中心点的第三位置信息为坐标原点进行坐标系转换，获取多个坐标系转换后的第二位置信息对应的多个第四位置信 息；
分别计算多个第四位置信息与坐标原点之间的距离；
根据计算出的距离确定每个像素点对应的权重值。
需要说明的是，第二位置信息包括多个，即有几个像素点就有几个第二位置信息，有几个第二位置信息就有几个第四位置信息。
需要说明的是，第二位置信息包括多个，即有几个像素点就有几个第二位置信息。
步骤607：根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
其中，根据公式(3)计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000047
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示对焦窗口所包含的像素点的总数量。
需要说明的是，ρ(i)越小(即距几何中心点越近)，w(i)就越大，ρ(i)越大(即距几何中心点越远)，w(i)就越小，这样就可以实现增加距几何中心点近的滤波值的权重，减小距几何中心点远(边缘区域)的滤波值的权重，从而降低了边缘的背景图像的影响，有效的避免了对焦物体偏离中心导致的误判。
本发明实施例还提供了一种移动终端，包括：
存储器，设置为存储指令；
处理器，设置为执行所述指令，实现如上所述的获取对焦值的方法的步骤。
所述存储器可为图1所述移动终端的存储器160；所述处理器可设置在图1所述移动终端的控制器180中。
本发明实施例还提供了一种计算机可读存储介质，其上存储有计算机 程序，所述计算机程序被处理器执行时实现以下步骤：
获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
确定每个像素点对应的权重值；
根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
可选的，所述计算机程序被处理器执行时还实现以下步骤：
在所述获取对焦窗口所包含的每个像素点的亮度值之前，检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；
当未检测到存在符合预设条件的外部指令时，将预设区域作为所述对焦窗口。
可选的，所述计算机程序被处理器执行时采用以下方式实现确定每个像素点对应的权重值：
确定所述对焦窗口的几何中心点；
获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
根据计算出的距离确定所述每个像素点对应的权重值。
可选的，所述计算机程序被处理器执行时采用以下方式实现计算当前帧图像的对焦值：
Figure PCTCN2017092693-appb-000048
其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重 值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
可选的，所述计算机程序被处理器执行时采用以下方式实现确定所述每个像素点对应的权重值：
Figure PCTCN2017092693-appb-000049
其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的每个模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。本发明不限制于任何特定形式的硬件和软件的结合。
以上仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间 接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。
工业实用性
本发明实施例通过获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；确定每个像素点对应的权重值；根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。本发明实施例提高了对焦的准确性，提升了用户体验。

Claims (20)

  1. 一种移动终端，包括：获取模块、滤波模块、第一确定模块和计算模块；其中，
    获取模块，设置为获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
    滤波模块，设置为对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
    第一确定模块，设置为确定每个像素点对应的权重值；
    计算模块，设置为根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
  2. 根据权利要求1所述的移动终端，该移动终端还包括：检测模块和第二确定模块；
    所述检测模块，设置为检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，向所述第二确定模块发送第一通知；当未检测到存在符合预设条件的外部指令时，向所述第二确定模块发送第二通知；
    所述第二确定模块，设置为接收到来自所述检测模块的第一通知，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；接收到来自所述检测模块的第二通知，将预设区域作为所述对焦窗口。
  3. 根据权利要求1或2所述的移动终端，其中，所述第一确定模块是设置为通过如下方式实现确定每个像素点对应的权重值：
    确定所述对焦窗口的几何中心点；
    获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
    根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
    根据计算出的距离确定所述每个像素点对应的权重值。
  4. 根据权利要求3所述的移动终端，其中，所述计算模块是设置为通过如下方式计算当前帧图像的对焦值：
    Figure PCTCN2017092693-appb-100001
    其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
  5. 根据权利要求4所述的移动终端，其中，所述第一确定模块是设置为通过如下方式确定所述每个像素点对应的权重值：
    Figure PCTCN2017092693-appb-100002
    其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
  6. 根据权利要求2所述的移动终端，其中，所述第二确定模块是设置为通过如下方式实现根据获得的外部指令的第一位置信息确定所述对焦窗口：
    将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
    Figure PCTCN2017092693-appb-100003
    为半径的圆形或以
    Figure PCTCN2017092693-appb-100004
    为边长的方形所覆盖的区域作为对焦区域；
    其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
  7. 根据权利要求6所述的移动终端，其中，
    所述方形包括长方形或正方形；
    当对焦区域是长方形时，
    Figure PCTCN2017092693-appb-100005
    表示的是该长方形的短边的一半，该长方形的长边大于
    Figure PCTCN2017092693-appb-100006
    当圆形是椭圆形时，
    Figure PCTCN2017092693-appb-100007
    表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
    Figure PCTCN2017092693-appb-100008
  8. 一种获取对焦值的方法，应用于对焦过程中，包括：
    移动终端获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
    对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
    确定每个像素点对应的权重值；
    根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
  9. 根据权利要求8所述的方法，该方法还包括：
    在所述获取对焦窗口所包含的每个像素点的亮度值之前，所述移动终检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；
    当未检测到存在符合预设条件的外部指令时，将预设区域作为所述对焦窗口。
  10. 根据权利要求8或9所述的方法，其中，所述确定每个像素点对应的权重值包括：
    确定所述对焦窗口的几何中心点；
    获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
    根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
    根据计算出的距离确定所述每个像素点对应的权重值。
  11. 根据权利要求10所述的方法，其中，根据以下公式计算当前帧图像的对焦值：
    Figure PCTCN2017092693-appb-100009
    其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
  12. 根据权利要求11所述的方法，其中，根据以下公式确定所述每个像素点对应的权重值：
    Figure PCTCN2017092693-appb-100010
    其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
  13. 根据权利要求9所述的方法，其中，根据获得的外部指令的第一位置信息确定所述对焦窗口包括：
    将以获得的外部指令的位置信息对应的像素点为几何中心点，且以
    Figure PCTCN2017092693-appb-100011
    为半径的圆形或以
    Figure PCTCN2017092693-appb-100012
    为边长的方形所覆盖的区域作为对焦区域；
    其中，L是移动终端的显示屏幕的边长；c是大于1的自然数。
  14. 根据权利要求13所述的方法，其中，
    所述方形包括长方形或正方形；
    当对焦区域是长方形时，
    Figure PCTCN2017092693-appb-100013
    表示的是该长方形的短边的一半，该长方形的长边大于
    Figure PCTCN2017092693-appb-100014
    当圆形是椭圆形时，
    Figure PCTCN2017092693-appb-100015
    表示的是该椭圆形的短轴半径，该椭圆形的长轴半径大于
    Figure PCTCN2017092693-appb-100016
  15. 一种移动终端，包括：
    存储器，设置为存储指令；
    处理器，设置为执行所述指令，实现如权利要求8至14任意一项所述的获取对焦值方法的步骤。
  16. 一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现以下步骤：
    获取当前帧图像中的对焦窗口所包含的每个像素点的亮度值；
    对获得的每个像素点的亮度值进行滤波以获取每个像素点的亮度值的滤波值；
    确定每个像素点对应的权重值；
    根据获得的每个像素点的亮度值的滤波值和确定出的每个像素点对应的权重值计算当前帧图像的对焦值。
  17. 如权利要求16所述的计算机可读存储介质，所述计算机程序被处理器执行时还实现以下步骤：
    在所述获取对焦窗口所包含的每个像素点的亮度值之前，检测是否存在符合预设条件的外部指令；当检测到存在符合预设条件的外部指令时，获取外部指令的第一位置信息；根据获得的外部指令的第一位置信息确定所述对焦窗口；
    当未检测到存在符合预设条件的外部指令时，将预设区域作为所述对焦窗口。
  18. 如权利要求16或17所述的计算机可读存储介质，其中，所述计算机程序被处理器执行时采用以下方式实现确定每个像素点对应的权重值：
    确定所述对焦窗口的几何中心点；
    获取所述对焦窗口所包含的每个像素点的第二位置信息，以及所述对焦窗口的几何中心点的第三位置信息；
    根据获得的所述第二位置信息和所述第三位置信息分别计算所述对焦窗口所包含的每个像素点与所述对焦窗口的几何中心点之间的距离；
    根据计算出的距离确定所述每个像素点对应的权重值。
  19. 如权利要求18所述的计算机可读存储介质，其中，所述计算机程序被处理器执行时采用以下方式实现计算当前帧图像的对焦值：
    Figure PCTCN2017092693-appb-100017
    其中，FV表示当前帧图像的对焦值；w(i)表示第i个像素点对应的权重 值；Q(i)表示第i个像素点的亮度值的滤波值；n表示所述对焦窗口所包含的像素点的总数量。
  20. 如权利要求19所述的计算机可读存储介质，其中，所述计算机程序被处理器执行时采用以下方式实现确定所述每个像素点对应的权重值：
    Figure PCTCN2017092693-appb-100018
    其中，w(i)表示第i个像素点对应的权重值；ρ(i)表示第i个像素点与所述对焦窗口的几何中心点之间的距离；exp表示指数函数；a、b均表示常数；δ表示调谐tuning参数。
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