WO2018019122A1

WO2018019122A1 - Focusing method, terminal, and computer storage medium

Info

Publication number: WO2018019122A1
Application number: PCT/CN2017/092457
Authority: WO
Inventors: 王乔明
Original assignee: 努比亚技术有限公司
Priority date: 2016-07-29
Filing date: 2017-07-11
Publication date: 2018-02-01
Also published as: CN106060407A

Abstract

Embodiments of the present invention disclose a focusing method, a terminal, and a computer storage medium. The method comprises: collecting a first image by an image sensor and performing initial focusing on the first image by adopting an initial ROI region; determining validity of a first ROI target image corresponding to the initial ROI region, the first ROI target image being a part of the first image; if it is determined that the first ROI target image is invalid, determining, according to a preset priority, a first ROI region from n preset ROI regions and a second ROI target image corresponding to the first ROI region to be valid, in which the second ROI target image is a part of the first image, the first ROI target image and the second ROI target image are not completely the same, and n is a preset value and is greater than 1; and determining a current phase difference corresponding to the first ROI region and focusing according to the current phase difference.

Description

Focusing method, terminal and computer storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. PCT Application No.

Technical field

The present invention relates to image processing technologies in the field of information processing, and more particularly to a focusing method, a terminal, and a computer storage medium.

Background technique

With the rapid development and popularization of mobile terminals, mobile terminals have become an indispensable tool in people's daily life, and mobile terminals with camera devices are widely favored by users. In order to obtain a better shooting experience, people have higher and higher requirements for the camera function of the mobile terminal, which not only requires an increase in the pixels of the camera device, but also requires an increase in the shooting speed of the camera device. Among them, the shooting speed is mainly determined by the focus mode.

At present, most mobile terminals on the market adopt contrast contrast or phase focusing, and drive the motor to move the lens back and forth to accurately find the target focus position. However, regardless of the focus mode, the range of the target focus position must be fixed. When the subject to be focused is small, the above focus mode cannot be focused.

Summary of the invention

In order to solve the above technical problem, embodiments of the present invention are expected to provide a focusing method, a terminal, and a computer storage medium, which can improve on the basis of ensuring accurate focusing of objects of different sizes. The efficiency of focusing.

The technical solution of the embodiment of the present invention is implemented as follows:

Embodiments of the present invention provide a focusing method, including:

Acquiring a first image by an image sensor, and initially focusing the first image by using a region of interest (ROI) region;

Determining validity of the first ROI target image corresponding to the initial ROI region, the first ROI target image being a partial image of the first image;

If it is determined that the first ROI target image is invalid, the first ROI region is determined from the n preset ROI regions according to the preset priority, and the second ROI target image corresponding to the first ROI region is valid, The second ROI target image is a partial image of the first image, the first ROI target image is not exactly the same as the second ROI target image, wherein n is a preset value, n is greater than or equal to 1;

Determining a current phase difference value corresponding to the first ROI region, and performing focusing according to the current phase difference value.

In an embodiment, a method for determining validity of an ROI target image corresponding to an ROI region includes:

Calculating a credibility value corresponding to the ROI region;

Comparing the credibility value with a preset threshold value, and determining, according to the comparison result, the validity of the ROI target image corresponding to the ROI region.

In an embodiment, the comparing the reliability value with the size of the preset threshold, determining, according to the comparison result, the validity of the ROI target image corresponding to the ROI region, including:

If the credibility value is less than a preset threshold, determining that the ROI target image is invalid;

If the credibility value is greater than or equal to the preset threshold, it is determined that the ROI target image is valid.

In an embodiment, the determining a current phase difference value corresponding to the first ROI area, the packet include:

And determining the current phase difference value according to a distance between the first pixel corresponding to the second ROI target image and the preset masking pixel.

In an embodiment, the achieving focus according to the current phase difference value comprises:

Detecting whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a range of phase difference values for triggering the terminal to achieve phase focusing;

If it is detected that the current phase difference value does not belong to the preset phase difference value range, moving the photographing motor to a target focus range corresponding to the current phase difference value;

Adjusting a position of the photographing motor within the target focus range to determine a target focus position within the first ROI region, thereby achieving focusing.

In an embodiment, the initial focusing of the first image by using an initial ROI region includes:

When the photographing instruction is received, the area identifier corresponding to the initial ROI area is outputted in the display area, and the first image is initially focused based on the area identifier corresponding to the initial ROI area.

In an embodiment, the initial ROI area is a pre-set area, or an area of desired focus determined based on an input operation.

In an embodiment, the preset priority of each of the preset ROI regions of the n preset ROI regions is associated with the size of the corresponding preset ROI region.

In an embodiment, the determining, by the preset priority, the first ROI area from the n preset ROI areas, including:

Determining validity of the ROI target image corresponding to the n ROI regions in sequence according to a preset priority, and determining that the ROI target image corresponding to one ROI region is valid, determining the ROI region as the first ROI region.

The embodiment of the invention further provides a terminal, including:

An acquisition unit configured to acquire a first image by using an image sensor;

a focusing unit configured to perform initial focusing on the first image acquired by the collecting unit by using an initial ROI area;

a determining unit, configured to determine validity of the first ROI target image corresponding to the initial ROI region, where the first ROI target image is a partial image of the first image;

The determining unit is configured to: if the determining unit determines that the first ROI target image is invalid, determine a first ROI region from the n preset ROI regions according to a preset priority, the first ROI region Corresponding second ROI target image is valid, the second ROI target image is a partial image of the first image, and the first ROI target image is not completely identical to the second ROI target image, wherein n is a pre- Setting a value, n is greater than or equal to 1; and determining a current phase difference value corresponding to the first ROI region;

The focusing unit is further configured to achieve focusing according to the current phase difference value determined by the determining unit.

In an embodiment, the terminal further includes: a computing unit;

The calculating unit is configured to calculate a credibility value corresponding to the ROI region;

The determining unit is configured to compare the value of the credibility value calculated by the calculating unit with a preset threshold, and determine the validity of the ROI target image corresponding to the ROI region based on the comparison result.

In an embodiment, the determining unit is further configured to: if the credibility value is less than a preset threshold, determine that the ROI target image is invalid; if the credibility value is greater than or equal to the preset threshold, determine The ROI target image is valid.

In an embodiment, the determining unit is configured to determine the current phase difference value according to a distance between a first pixel corresponding to the second ROI target image and a preset masking pixel.

In an embodiment, the terminal further includes: a detecting unit and a displacement unit;

The detecting unit is configured to detect whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a phase difference value that triggers the terminal to achieve phase focusing Wai

The displacement unit is configured to move the photographing motor to a target focus range corresponding to the current phase difference value if the detecting unit detects that the current phase difference value does not belong to the preset phase difference value range Inside;

The focusing unit is configured to adjust a position of the photographing motor within the target focus range to determine a target in-focus position in the first ROI region, thereby achieving focusing.

In an embodiment, the focusing unit is configured to output an area identifier corresponding to the initial ROI area in the display area when the photographing instruction is received, and initialize the first image based on the area identifier corresponding to the initial ROI area. Focus.

In an embodiment, the determining unit is configured to sequentially determine validity of the ROI target image corresponding to the n ROI regions according to a preset priority order, and determine an ROI target image corresponding to one ROI region. When valid, the ROI area is determined as the first ROI area.

An embodiment of the present invention further provides a terminal, including: a processor and a memory for storing a computer program capable of running on a processor; wherein the processor is configured to execute the computer program, execute an embodiment of the present invention The steps of the focusing method.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the focusing method according to the embodiment of the invention.

The focusing method, the terminal and the computer storage medium provided by the embodiment of the invention collect the first image by using the image sensor, and initially focus the first image by using the initial ROI region; The validity of the first ROI target image corresponding to the initial ROI region, the first ROI target image is a partial image of the first image; if it is determined that the first ROI target image is invalid, according to the preset priority, from the n presets The first ROI area is determined in the ROI area, and the second ROI target image corresponding to the first ROI area is valid, the second ROI target image is a partial image of the first image, and the first ROI target image and the second ROI target image are incomplete The same, wherein n is a preset value, n is greater than or equal to 1; determining a current phase difference value corresponding to the first ROI region, and achieving focusing according to the current phase difference value. With the above-mentioned technical implementation, when the terminal performs a photographing, a plurality of preset ROI regions are set to focus on the first image, and the technical solution of the embodiment of the present invention can be used when the terminal can take photos of objects or objects of different sizes. Adjusting the ROI area of different presets adaptively, so as to adjust the focus of different objects with different credibility corresponding to different preset ROI areas, so as to ensure that the focus of objects of different sizes is improved on the basis of accurate focus. The efficiency of focusing.

DRAWINGS

1 is a schematic structural diagram of hardware of an optional terminal for implementing various embodiments of the present invention;

2 is a communication system that the mobile terminal of the present invention can operate;

FIG. 3 is a flowchart 1 of a focusing method according to an embodiment of the present invention;

4 is a schematic diagram of operation of a focus command according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an interface for setting an initial ROI area according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an exemplary multiple ROI area according to an embodiment of the present invention; FIG.

FIG. 7 is a second flowchart of a focusing method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram 1 of a terminal according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram 2 of a terminal according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram 3 of a terminal according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram 4 of a terminal according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

A mobile terminal embodying various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, the use of suffixes such as "module", "component" or "unit" for indicating an element is merely an explanation for facilitating the present invention, and does not have a specific meaning per se. Therefore, "module" and "component" can be used in combination.

It should be noted that the focusing method provided by the embodiment of the present invention can be applied to a terminal, such as a computer or a mobile terminal, and the like, which can use a browser.

Among them, the mobile terminal can be implemented in various forms. For example, the terminals described in the present invention may include, for example, mobile phones, smart phones, notebook computers, digital broadcast receivers, personal digital assistants (PDAs), tablet computers (PADs), portable multimedia players (PMPs), navigation devices, and the like. Mobile terminals and fixed terminals such as digital TVs, desktop computers, and the like. In the following, it is assumed that the terminal is a mobile terminal. However, those skilled in the art will appreciate that configurations in accordance with embodiments of the present invention can be applied to fixed type terminals in addition to components that are specifically for mobile purposes.

FIG. 1 is a schematic diagram showing the hardware structure of an optional mobile terminal that implements various embodiments of the present invention.

The mobile terminal 1 may include a wireless communication unit 110, an audio/video (A/V) 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 1 and a wireless communication system or network. For example, the wireless communication unit 110 may include a mobile communication module 112, a wireless internet module 113, a short-range communication module 114, and a location information module. At least one of the blocks 115.

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. 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 100. The wireless internet module 113 can be internally or externally coupled to the terminal. The wireless internet access technologies involved in the wireless internet module 113 may include wireless local area network (WLAN), wireless compatibility authentication (Wi-Fi), wireless broadband (Wibro), global microwave interconnection access (Wimax), and high speed downlink. Packet Access (HSDPA) and more.

The short range communication module 114 is a module for supporting 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 for checking or acquiring location information of the mobile terminal. A typical example of a location information module is a Global Positioning System (GPS) module. According to current technology, the GPS module 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. Currently, the method for calculating position and time information uses three satellites and corrects the calculated position and time information errors by using another satellite. Further, the GPS module can calculate the speed information by continuously calculating the current position information in real time.

The A/V input unit 120 is for receiving an audio or video signal. The A/V input unit 120 may include a camera 121 that processes image data of still pictures or video obtained by an image capturing device in a video capturing mode or an image capturing mode. The processed image 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 may be transmitted according to the mobile terminal. The configuration of the end provides two or more cameras 121.

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. In particular, when the touch panel is superimposed on the display unit 151 in the form of a layer, a touch screen can be formed.

The sensing unit 140 detects the current state of the mobile terminal 1 (eg, the open or closed state of the mobile terminal 1), the location of the mobile terminal 1, the presence or absence of contact (ie, touch input) by the user with the mobile terminal 1, and the mobile terminal. The orientation of 1, the acceleration or deceleration movement and direction of the mobile terminal 1, and the like, and generates a command or signal for controlling the operation of the mobile terminal 1. For example, when the mobile terminal 1 is implemented as a slide type mobile phone, the sensing unit 140 can sense whether the slide type phone is turned on or off. In addition, 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. Sensing unit 140 may include proximity sensor 141 which will be described below in connection with a touch screen.

The interface unit 170 serves as an interface through which at least one external device can connect with the mobile terminal 1. For example, 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 for connecting 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 1 and may include a User Identification Module (UIM), a Customer Identification Module (SIM), a Universal Customer Identification Module (USIM), and the like. In addition, the device having the identification module (hereinafter referred to as "identification device") may take the form of a smart card, and thus the identification device may be connected to the mobile terminal 1 via a port or other connection device. The interface unit 170 can be configured to receive input (eg, data information, power, etc.) from an external device and transmit the received input to one or more components within the mobile terminal 1 or can be used in the mobile terminal and external device Transfer data between.

In addition, when the mobile terminal 1 is connected to the external base, the interface unit 170 may function as a path through which power is supplied from the base to the mobile terminal 1 or may be used as a variety of command signals allowed to be input from the base to be transmitted to the mobile 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 and the like.

The display unit 151 can display information processed in the mobile terminal 1. For example, when the mobile terminal 1 is in the 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 1 is in the video call mode or the 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.

Meanwhile, when the display unit 151 and the touch panel are superposed on each other in the form of a layer to form a touch screen, 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. 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. According to a particular desired embodiment, the mobile terminal 1 may comprise two or more display units (or other display devices), for example, the mobile terminal may comprise an external display unit (not shown) and an internal display unit (not shown) . The touch screen can be used to detect touch input pressure as well as touch input position and touch input area.

The memory 160 may store a software program or the like that performs processing and control operations performed by the controller 180, or may temporarily store data that has been output or is to be output (for example, a phone book, Messages, still images, videos, etc.). 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. Moreover, the mobile terminal 1 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. In addition, the controller 180 may include a multimedia module 181 for reproducing (or playing 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. For hardware implementations, 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 ( 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. For software implementations, 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, the software code can It is stored in the memory 160 and executed by the controller 180.

So far, the mobile terminal has been described in terms of its function. Hereinafter, for the sake of brevity, 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 invention can be applied to any type of mobile terminal, and is not limited to a slide type mobile terminal.

The mobile terminal 1 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 in which a mobile terminal according to the present invention can be operated will now be described with reference to FIG.

Such communication systems may use different air interfaces and/or physical layers. For example, 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. As a non-limiting example, the following description relates to a CDMA communication system, but such teachings are equally applicable to other types of systems.

Referring to FIG. 2, a CDMA wireless communication system may include a plurality of mobile terminals 1, 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. The MSC 280 is also configured to interface with a BSC 275 that can be coupled to the BS 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 may include multiple BSCs 2750.

Each BS 270 can serve one or more partitions (or regions), with each partition covered by a multi-directional antenna or an antenna pointing in a particular direction radially away from the BS 270. Alternatively, each partition may be covered by two or more antennas for diversity reception. 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.).

The intersection of partitioning and frequency allocation can be referred to as a CDMA channel. BS 270 may also be referred to as a Base Transceiver Subsystem (BTS) or other equivalent terminology. In such a case, the term "base station" can be used to generally mean a single BSC 275 and at least one BS 270. A base station can also be referred to as a "cell station." Alternatively, each partition of a particular BS 270 may be referred to as multiple cellular stations.

As shown in FIG. 2, a broadcast transmitter (BT) 295 transmits a broadcast signal to the mobile terminal 1 operating within the system. In FIG. 2, several Global Positioning System (GPS) satellites 300 are shown that help locate at least one of a plurality of mobile terminals 1.

In Figure 2, 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, which is the location information module 115 shown in Figure 1, is typically configured to cooperate with the satellite 300 to obtain the 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.

As a typical operation of a wireless communication system, the BS 270 receives reverse link signals from various mobile terminals 1. The mobile terminal 1 typically participates in calls, messaging, and other types of communications. Each reverse link signal received by a particular BS 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. Similarly, 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 1.

Various embodiments of the present invention are proposed based on the above-described mobile terminal hardware structure and communication system.

Before describing the focusing method of the embodiment of the present invention, the ROI will first be described. In machine vision and image processing, the area to be processed is outlined from the processed image in the form of a box, a circle, an ellipse, an irregular polygon, etc., called an ROI. In Halcon, OpenCV, Matlab Various machine operators (computers) and functions are commonly used to obtain the ROI, and the next step of the image processing is performed.

Among them, in the field of image processing, the ROI area is an image area selected from the image, which is the focus of image analysis, and the area is delineated for further processing, and the ROI is used to delineate the target image, which can reduce processing time and increase precision. .

Embodiment 1

An embodiment of the present invention provides a focusing method. As shown in FIG. 3, the method may include:

S101. Acquire a first image by using an image sensor, and perform initial focusing on the first image by using an initial ROI region.

It should be noted that the focus method provided by the embodiment of the present invention is implemented in a scene in which a photograph is taken on a terminal.

Focusing refers to adjusting the focus distance when using an image sensor such as a camera or a camera. Focusing can also be called focusing and focusing. The focus distance is adjusted by the camera application on the camera or the terminal, that is, the object distance and the distance are adjusted, so that the process of sharpening the object is focusing.

Among them, phase focusing is achieved by detecting the phase shift amount of the image. A grid of parallel lines is placed at the position of the photosensitive image sensor, and the lines are successively transparent and opaque. Two light-receiving elements are placed symmetrically with respect to the optical axis at appropriate positions behind the network board. The network board reciprocates in a direction perpendicular to the optical axis. When the focusing surface coincides with the network board, the light passing through the grid plate transmits light to the two light receiving elements at the same time. When defocusing, the beam can only reach two light-receiving elements one after the other, so there is a phase difference between their output signals. After the two signals with phase difference are processed by the circuit, the driving motor can be controlled to adjust the position of the objective lens, so that the focal plane coincides with the plane of the grid plate, thereby achieving autofocus.

It should be noted that, in the embodiment of the present invention, an image sensor is disposed on the terminal, and the terminal acquires a first image by using an image sensor, where the first image is previewed on the display screen of the terminal after the camera application on the terminal is started. Image.

As an embodiment, the image sensor in the embodiment of the present invention may be a sensor based on Phase Detection Auto Focus (PDAF) technology, which is referred to as a PD sensor.

In the embodiment of the present invention, the user uses the terminal to take a photo. When the user clicks on the camera application to activate the camera application, the user clicks the “shooting button”, that is, when the terminal receives the photographing instruction, the initial ROI area appears on the display screen of the terminal. That is, the area identifier corresponding to the initial ROI area is output in the display area, and the terminal attempts to focus the first image based on the area identifier corresponding to the initial ROI area.

Specifically, when the user wants to take a photo, the camera of the terminal is activated, and the camera may be a camera located on the first surface of the terminal (eg, a front camera), a camera located on the second surface of the terminal (eg, a rear camera) Or two cameras or the like located on the same surface of the terminal.

In this embodiment, the initial ROI area is a preset area, or an area of desired focus determined based on an input operation. As an embodiment, as shown in FIG. 4, when the user wants to take a photo, the user can click the area of the display screen of the terminal and the area that the user desires to focus on by triggering the operation to trigger the shooting device of the terminal to perform the operation-based area. Autofocusing is performed. At this time, the display screen of the terminal can display the initial ROI area based on the position of the operation, and the trigger operation of the user receives the focus command, and the terminal starts focusing according to the focus instruction. As another implementation manner, an initial ROI area may also be pre-configured in the terminal, such as an area located at the center of the display screen.

As an embodiment, the initial ROI area in the embodiment of the present invention may be identified by at least one rectangular frame, a circular frame, or another closed frame of the geometrical shape outputted in the display area, and corresponds to the initial ROI area in the embodiment of the present invention. The shape of the area logo is not limited.

It should be noted that, in the focusing method provided by the embodiment of the present invention, n (n is greater than or equal to 1) ROI regions may be set, and one of the n ROI regions is selected as the initial ROI region, specifically, initial The size of the ROI area can be selected automatically or by default. Therefore, the user manually sets, as shown in FIG. 5, the user can perform the setting of the initial ROI area (automatic default or manual setting) in the focusing function of the camera setting interface in the setting application of the terminal.

It should be noted that the parameter setting of the size of the n ROI regions in the embodiment of the present invention may also be automatically defaulted and manually set, provided that the determination of the n ROI regions is determined based on the performance of the PD sensor.

S102. Determine validity of a first ROI target image corresponding to the initial ROI region, where the first ROI target image is a partial image of the first image.

After the terminal initially focuses the first image by using the initial ROI area, the terminal determines the validity of the first ROI target image corresponding to the initial ROI area, that is, the first ROI target image, in order to ensure the sharpness of the photograph. The focus effect is judged to determine whether it is necessary to reselect the ROI area from the n ROI areas.

It should be noted that the validity of the ROI target image in the embodiment of the present invention refers to the validity of the PD value of the ROI region corresponding to the ROI target image, wherein the PD value refers to the phase difference value.

S103. If it is determined that the first ROI target image is invalid, determining a first ROI region from the n preset ROI regions according to a preset priority, where the second ROI target image corresponding to the first ROI region is valid, the second The ROI target image is a partial image of the first image, and the first ROI target image is not completely identical to the second ROI target image, wherein n is a preset value, and n is greater than or equal to 1.

After the terminal determines the validity of the first ROI target image corresponding to the initial ROI region, if the terminal determines that the first ROI target image corresponding to the initial ROI region is invalid, the focus effect of the initial ROI region is not good for the characterizing terminal. The terminal may determine, according to the preset priority, that the ROI target image corresponding to one ROI region is valid from the n preset ROI regions that have been set, that is, determine the first ROI region from the n preset ROI regions, where the first ROI region is determined. The second ROI target image corresponding to one ROI region is valid.

It should be noted that, in the embodiment of the present invention, n ROI regions, the n ROIs may be disposed. Areas are areas where the ROI areas differ or do not overlap completely. Therefore, the first ROI target image and the second ROI target image should be different portions of the first image, but overlapping portions are not excluded.

As an embodiment, the size of the n ROI regions in the embodiment of the present invention may be a plurality of focus windows (ROI regions) having a small size, a medium size, and a large size with respect to the first image.

It should be noted that the preset priority in the embodiment of the present invention refers to the priority of the n ROI areas.

As an embodiment, in the embodiment of the present invention, the n preset ROI regions are prioritized to be associated with the region size; specifically, the smaller the area of the ROI region is, the higher the priority of the ROI region may be.

Exemplarily, as shown in FIG. 6 , it is assumed that there are three ROI regions, the ROI region 1 is the smallest, and the ROI region 3 is the largest. Therefore, the preset priority of the above three ROI regions is: the ROI region 1 is greater than the ROI region 2 is greater than the ROI. In the area 3, when the terminal performs photographing, according to the focusing mode provided by the embodiment of the present invention, when shooting an object with a different size, different ROI regions are selected to achieve better focusing.

Specifically, the determining, by the terminal according to the preset priority, the first ROI area from the n preset ROI areas may be: the terminal sequentially validating the ROI target images corresponding to the n ROI areas according to the preset priority order. It is determined that, when it is determined that the ROI target image corresponding to one ROI region is valid, the ROI region is determined as the first ROI region, that is, the second ROI target image corresponding to the first ROI region is determined to be valid.

It should be noted that the method for determining the validity of the first ROI target image and the second ROI target image in the embodiment of the present invention is the same, that is, the validity of the n ROI target images corresponding to the n ROI regions. The judgment is the same.

In the embodiment of the present invention, the terminal may determine that the validity of the ROI target image corresponding to the ROI region is: the terminal calculates the credibility value corresponding to the ROI region; and compares the credibility value with the preset threshold. Small, based on the comparison result, determining the validity of the ROI target image corresponding to the ROI region; if the reliability value is less than the preset threshold, determining that the ROI target image is invalid; if the reliability value is greater than or equal to the preset threshold, determining the ROI target image effective.

It should be noted that the credibility in the embodiment of the present invention refers to the value of the PD confidence level output by the PD sensor, that is, one data that represents the trusted size of the PD value is the confidence level (ie, PD confidence level). . Among them, the greater the value of PD confidence level, the higher the credibility of characterizing PD values.

S104. Determine a current phase difference value corresponding to the first ROI region, and perform focusing according to the current phase difference value.

After determining the first ROI area from the n preset ROI areas according to the preset priority, the terminal can calculate the reliability value corresponding to the ROI area, so the terminal can judge the ROI by the credibility value. The validity of the target image, that is, the validity of the PD value corresponding to the ROI region, when the PD value is valid, the focus can be focused according to the PD value. Then, after determining that the second ROI image corresponding to the first ROI is valid, the terminal determines a current phase difference value corresponding to the first ROI region, and performs focusing according to the current phase difference value.

Specifically, the terminal determines a current phase difference according to a distance between the first pixel corresponding to the second ROI target image and the preset masking pixel, and the terminal detects whether the current phase difference belongs to a preset phase difference range, and the preset The phase difference range is set to a range of phase difference values for triggering the terminal to achieve phase focusing; if it is detected that the current phase difference value does not belong to the preset phase difference value range, the terminal moves the shooting motor to the target corresponding to the current phase difference value. Within the focus range; the terminal adjusts the position of the shooting motor within the target focus range to determine the target focus position within the first ROI area for focus.

Embodiment 2

An embodiment of the present invention provides a focusing method. As shown in FIG. 7, the method may include:

S201. Acquire a first image by using an image sensor, and adopt an initial ROI area to the first image. Like initial focus.

The description of the detailed process of this step is consistent with the description process of S101 in the previous embodiment, and details are not described herein again.

S202. Calculate an initial credibility value corresponding to the initial ROI region.

S203. Compare the initial credibility value with the size of the preset threshold, and determine, according to the comparison result, the validity of the first ROI target image corresponding to the initial ROI region, where the first ROI target image is a partial image of the first image.

After the initial focus is performed on the first image by using the initial ROI area, in order to ensure the sharpness of the photograph, the terminal will judge the validity of the first ROI target image corresponding to the set initial ROI area, that is, the first The focus effect of the ROI target image is judged to determine whether it is necessary to reselect from the n ROI regions.

Specifically, if the initial credibility value is less than the preset threshold, the terminal determines that the first ROI target image is invalid; if the initial credibility value is greater than or equal to the preset threshold, the terminal determines that the first ROI target image is valid.

S204. If it is determined that the first ROI target image is invalid, determining a first ROI region from the n preset ROI regions according to a preset priority, where the second ROI target image corresponding to the first ROI region is valid, the second ROI The target image is a partial image of the first image, and the first ROI target image is not exactly the same as the second ROI target image, wherein n is a preset value, and n is greater than or equal to 1.

The description of the detailed process of this step is consistent with the description process of S103 in the previous embodiment, and details are not described herein again.

It should be noted that, the method for determining, by the terminal, the validity of the second ROI target image is: the terminal calculates a first credibility value corresponding to the first ROI region, and if the first credibility value is less than a preset threshold, the terminal determines the second The ROI target image is invalid; if the first credibility value is greater than or equal to the preset threshold, the end The terminal determines that the second ROI target image is valid.

S205. Determine a current phase difference value according to a distance between the first pixel corresponding to the second ROI target image and the preset masking pixel.

Specifically, when the terminal receives the shooting instruction using phase focusing, it can be understood that the user turns on the shooting device and performs a click operation on the display screen of the terminal in the image capturing mode (as shown in FIG. 4 ), and the shooting device at this time The current phase difference value between the two images formed on the PD sensor (the second ROI target image and the preset mask image) is acquired. The terminal can open the camera through its own camera program, or use other applications to call or turn on the camera, such as social software, image processing software and other applications. Among them, the phase focusing separates the image into two images through the separation lens and the linear sensor, and then detects the distance between the two images through the linear sensor, that is, the phase difference between the two images, and finally the linear signal through the phase detection. And the phase difference value to determine whether the current focus position is front or back, and accurately tells the camera motor which direction the lens should be driven to move, and in the accurate focus position, the phase focus system can accurately know that the current focus is already Focus state.

S206. Detect whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a phase difference value range in which the trigger terminal implements phase focusing.

Specifically, the terminal detects whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a range of phase difference values that triggers the terminal to achieve phase focusing. Since phase focusing has certain requirements on the light and details in the environment, it is not possible to use phase focusing to focus in any environment. When the light and details in the environment meet the requirements, the terminal can be triggered by phase focusing. It is understood that the phase difference value at this time can trigger phase focusing, and the phase difference value at this time is within the preset phase difference value range. However, when the light in the environment is not very sufficient and the details are not very rich, the phase difference at this time is small and is not within the preset phase difference range, so phase focusing cannot be triggered.

S207. If it is detected that the current phase difference value does not belong to the preset phase difference value range, the shooting will be performed. The motor moves to within the target focus range corresponding to the current phase difference.

As an implementation manner, first, when the result of the detection is that the current phase difference value does not belong to the preset phase difference value range, the terminal determines the movement information of the photographing motor according to the current phase difference value.

In this embodiment, when the result of the detection is no, that is, the current phase difference value does not belong to the preset phase difference value range, it can be understood that the current phase difference value cannot trigger the terminal to use phase focusing to perform focusing. Regardless of which focusing method is used, it is necessary to determine the movement information of the shooting motor, that is, in which direction to move, how much distance to move, the shooting motor can drive the movement of the lens, and during the shooting process, the moving shooting motor must drive the movement of the lens, thereby Focus the lens at the exact focus position to complete the shot. When the focus can be performed by the phase focusing method, the photographing device directly moves the photographing motor to the focus position according to the current phase difference value. When using the contrast focus method to focus, if the lens is at the back end, the camera motor moves to the front end and then back to the back end to determine the focus position; if the lens is at the front end, the camera motor moves to the back end and then Move to the front to determine the focus position.

When the result of the detection is negative, the terminal determines movement information of the photographing motor according to the current phase difference value, the movement information including a moving direction and a moving distance. The terminal determines whether the shooting motor moves to the front end or the back end according to the positive or negative of the current phase difference value. As an implementation manner, when the current phase difference value is positive, the shooting motor moves to the rear end; when the current phase difference value is When it is negative, the shooting motor moves to the front end. The terminal determines the moving distance of the photographing motor based on the absolute value of the current phase difference value.

Next, the terminal determines a target focus range of the photographing motor based on the movement information.

In this embodiment, after determining the moving direction, the terminal moves the shooting motor to the target position according to the moving distance, and the terminal determines the target focusing range of the shooting motor according to the target position and the preset distance, where the target is at the midpoint of the focusing range. The position is a range in which the front-rear distance at the target position is a preset distance as the target focus range. Wherein, the value of the preset distance is small, so that the target focus range is much smaller than the moving range of the contrast focus, and the specific value of the preset distance can be preset by the manufacturer of the terminal based on the specific situation.

Finally, the terminal moves the shooting motor to the target focus range.

In this embodiment, once the target focus range is determined, the terminal moves the photographing motor to the target focus range, so that the photographing device of the terminal can find the target focus position, that is, the position of accurate focus, within the target focus range.

S208. Adjust a position of the photographing motor within a target focus range to determine a target focus position in the first ROI region, thereby achieving focusing.

After the terminal moves the photographing motor to the target focus range corresponding to the current phase difference value, since the current phase difference is for the first ROI region, the target focus range belongs to the first ROI region, and the target target focus range is By adjusting the position of the shooting motor internally, the target focus position can be determined in the first ROI area, thereby achieving focusing.

With the focusing method provided by the embodiment of the present invention, for a small object, multiple ROI regions can be accurately matched to a small object to achieve focusing; and for a case where the middle is a flat region, a small ROI region in multiple ROI regions is used. The PD confidence level value is very small, so the larger ROI area is selected, so that the flat area can be easily focused, and the PD value and PD confidence level value of each ROI area are directly output by the sensor. Basically, it does not participate in the calculation before processing, so the operation efficiency is also very high.

Embodiment 3

As shown in FIG. 8, the embodiment of the present invention provides a terminal 1, which may include:

The collecting unit 10 is configured to acquire a first image by using an image sensor;

The focusing unit 11 is configured to perform initial focusing on the first image collected by the collecting unit 10 by using an initial ROI region;

The determining unit 12 is configured to determine validity of the first ROI target image corresponding to the initial ROI region, where the first ROI target image is a partial image of the first image;

The determining unit 13 is configured to determine, according to the preset priority, the first ROI area from the n preset ROI areas, if the determining unit 12 determines that the first ROI target image is invalid. a second ROI target image corresponding to the first ROI region is valid, the second ROI target image is a partial image of the first image, and the first ROI target image and the second ROI target image are not The same is true, wherein n is a preset value, n is greater than or equal to 1; and determining a current phase difference value corresponding to the first ROI region;

The focusing unit 11 is further configured to achieve focusing according to the current phase difference value determined by the determining unit 13.

As an embodiment, as shown in FIG. 9, the terminal 1 further includes: a computing unit 14;

The calculating unit 14 is configured to calculate a credibility value corresponding to the ROI region.

The determining unit 12 is configured to compare the value of the credibility value calculated by the calculating unit 14 with a preset threshold, and determine the validity of the ROI target image corresponding to the ROI region based on the comparison result.

As an implementation manner, the determining unit 12 is further configured to: if the credibility value is less than a preset threshold, determine that the ROI target image is invalid; if the credibility value is greater than or equal to the preset threshold, It is determined that the ROI target image is valid.

As an implementation manner, the determining unit 13 is configured to determine the current phase difference value according to a distance between a first pixel corresponding to the second ROI target image and a preset masking pixel.

As an embodiment, as shown in FIG. 10, the terminal 1 further includes: a detecting unit 15 and a displacement unit 16;

The detecting unit 15 is configured to detect whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a range of phase difference values for triggering the terminal to achieve phase focusing;

The displacement unit 16 is configured to move the photographing motor to a target corresponding to the current phase difference value if the detecting unit 15 detects that the current phase difference value does not belong to the preset phase difference value range Within the focus range;

The focusing unit 11 is configured to adjust a position of the photographing motor within the target focus range to determine a target focus position within the first ROI region, thereby achieving focusing.

As shown in FIG. 11, in an actual application, the above-mentioned focusing unit 11, the determining unit 12, the determining unit 13, the calculating unit 14, the detecting unit 15, and the shifting unit 16 may be implemented by the processor 17 located on the terminal 1, specifically through the center. Implemented by a processor (CPU), a microprocessor (MPU), a DSP or an FPGA, etc., the above-mentioned acquisition unit 10 can be implemented by a camera 18 on the terminal 1, and the terminal 1 can further include a memory 19, which can be connected through the system bus 110. The processor 17 is connected, wherein the memory 19 is for storing executable program code, the program code comprising computer operating instructions, the memory 19 may comprise a high speed RAM memory, and possibly also a non-volatile memory, such as at least one disk memory.

It should be noted that, when the information reminding device provided by the foregoing embodiment is used for the information reminding, only the division of each of the foregoing program modules is illustrated. In an actual application, the processing allocation may be completed by different program modules as needed. The internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the information reminding device and the information reminding method embodiment provided by the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.

The embodiment of the present invention further provides a terminal, as shown in FIG. 11, the terminal includes: a processor 17 and a memory 19 for storing a computer program capable of running on the processor 17, wherein the processor 17 is the step of performing the focusing method of the embodiment of the present invention when the computer program is run. Specifically, when the processor 17 is configured to run the computer program, the first image is acquired by an image sensor, and the first image is initially focused by using an initial region of interest ROI; and the initial ROI region is determined. Corresponding first ROI target image, the first ROI target image is a partial image of the first image; if it is determined that the first ROI target image is invalid, according to a preset priority, from n Determining a first ROI area in the preset ROI area, where the second ROI target image corresponding to the first ROI area is valid, The second ROI target image is a partial image of the first image, and the first ROI target image is not exactly the same as the second ROI target image, where n is a preset value, n is greater than or equal to 1; a current phase difference value corresponding to the first ROI region, and performing focusing according to the current phase difference value.

As an implementation manner, when the processor 17 is configured to run the computer program, performing: calculating a credibility value corresponding to the ROI region; comparing the credibility value with a preset threshold, based on comparing As a result, the validity of the ROI target image corresponding to the ROI region is determined.

As an embodiment, when the processor 17 is configured to run the computer program, if the credibility value is less than a preset threshold, determining that the ROI target image is invalid; if the credibility value is If the preset threshold is greater than or equal to, the ROI target image is determined to be valid.

As an embodiment, when the processor 17 is configured to run the computer program, determining, according to a distance between a first pixel corresponding to the second ROI target image and a preset masking pixel, determining the current Phase difference.

As an implementation manner, when the processor 17 is configured to run the computer program, it is executed to: detect whether the current phase difference value belongs to a preset phase difference value range, and the preset phase difference value range is a trigger. The terminal realizes a phase difference range of the phase focus; if it is detected that the current phase difference does not belong to the preset phase difference range, moving the shooting motor to a target focus range corresponding to the current phase difference Adjusting a position of the photographing motor within the target focus range to determine a target focus position within the first ROI region, thereby achieving focusing.

As an embodiment, when the processor 17 is configured to execute the computer program, the processor 17 outputs: when receiving the photographing instruction, outputting an area identifier corresponding to the initial ROI area in the display area, based on the area corresponding to the initial ROI area. An initial focus is performed on the first image.

As an implementation manner, when the processor 17 is configured to run the computer program, performing: determining, according to a preset priority order, the validity of the ROI target image corresponding to the n ROI regions, and determining When an ROI target image corresponding to an ROI area is valid, The ROI area is determined as the first ROI area.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the focusing method according to the embodiment of the invention. Specifically, when the computer executable instruction is executed, the first image is acquired by the image sensor, and the first image is initially focused by using an initial region of interest ROI region; and the first ROI region is determined to be corresponding to the first image. The validity of the ROI target image, the first ROI target image is a partial image of the first image; if it is determined that the first ROI target image is invalid, according to a preset priority, from n preset ROI regions Determining a first ROI region, wherein a second ROI target image corresponding to the first ROI region is valid, the second ROI target image is a partial image of the first image, the first ROI target image and the first The two ROI target images are not identical, wherein n is a preset value, n is greater than or equal to 1; a current phase difference value corresponding to the first ROI region is determined, and focusing is performed according to the current phase difference value.

As an implementation manner, when the computer executable instruction is executed, the method is: calculating a credibility value corresponding to the ROI region; comparing the credibility value with a preset threshold, and determining the The validity of the ROI target image corresponding to the ROI region.

As an embodiment, when the computer executable instruction is executed, if the credibility value is less than a preset threshold, determining that the ROI target image is invalid; if the credibility value is greater than or equal to the The preset threshold is used to determine that the ROI target image is valid.

As an embodiment, when the computer executable instructions are executed, the current phase difference value is determined according to a distance between a first pixel corresponding to the second ROI target image and a preset shadow pixel.

As an implementation manner, when the computer executable instruction is executed, it is implemented to: detect whether the current phase difference value belongs to a preset phase difference value range, and the preset phase difference value range is a trigger terminal to implement phase focusing a phase difference value range; if it is detected that the current phase difference value does not belong to the preset phase difference value range, moving the photographing motor to the current phase difference value Corresponding to the target focus range; adjusting the position of the photographing motor within the target focus range to determine a target focus position within the first ROI region, thereby achieving focusing.

As an embodiment, when the computer executable instruction is executed, when the photographing instruction is received, the area identifier corresponding to the initial ROI area is output in the display area, and the area identifier corresponding to the initial ROI area is used to The first image is initially focused.

As an implementation manner, when the computer executable instructions are executed, the method further determines, according to a preset priority order, the validity of the ROI target image corresponding to the n ROI regions, and determines an ROI region. When the corresponding ROI target image is valid, the ROI area is determined as the first ROI area.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in a flow chart A function specified in a block or blocks of a process or multiple processes and/or block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the technical solution of the embodiment of the present invention, the terminal can adaptively adjust different preset ROI regions when taking photos of objects or objects of different sizes, so that different credibility corresponding to different preset ROI regions are used to different The object is adjusted in focus to ensure the focus efficiency is improved on the basis of accurate focus of objects of different sizes.

Claims

A focusing method comprising:

Acquiring a first image by an image sensor, and initially focusing the first image by using an initial region of interest ROI region;

Determining validity of the first ROI target image corresponding to the initial ROI region, the first ROI target image being a partial image of the first image;

If it is determined that the first ROI target image is invalid, the first ROI region is determined from the n preset ROI regions according to the preset priority, and the second ROI target image corresponding to the first ROI region is valid, The second ROI target image is a partial image of the first image, the first ROI target image is not exactly the same as the second ROI target image, wherein n is a preset value, n is greater than or equal to 1;

Determining a current phase difference value corresponding to the first ROI region, and performing focusing according to the current phase difference value.
The method of claim 1, wherein the method for determining the validity of the ROI target image corresponding to the ROI region comprises:

Calculating a credibility value corresponding to the ROI region;

Comparing the credibility value with a preset threshold value, and determining, according to the comparison result, the validity of the ROI target image corresponding to the ROI region.
The method according to claim 2, wherein the comparing the reliability value with the size of the preset threshold, determining the validity of the ROI target image corresponding to the ROI region based on the comparison result, comprising:

If the credibility value is less than a preset threshold, determining that the ROI target image is invalid;

If the credibility value is greater than or equal to the preset threshold, it is determined that the ROI target image is valid.
The method of claim 1 wherein said determining said first ROI region pair The current phase difference value that should be included, including:

And determining the current phase difference value according to a distance between the first pixel corresponding to the second ROI target image and the preset masking pixel.
The method of claim 1 wherein said achieving focus based on said current phase difference comprises:

Detecting whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a range of phase difference values for triggering the terminal to achieve phase focusing;

If it is detected that the current phase difference value does not belong to the preset phase difference value range, moving the photographing motor to a target focus range corresponding to the current phase difference value;

Adjusting a position of the photographing motor within the target focus range to determine a target focus position within the first ROI region, thereby achieving focusing.
The method of claim 1 wherein said initial focusing of said first image using an initial ROI region comprises:

When the photographing instruction is received, the area identifier corresponding to the initial ROI area is outputted in the display area, and the first image is initially focused based on the area identifier corresponding to the initial ROI area.
The method according to any one of claims 1 to 6, wherein the initial ROI area is a preset area, or an area of desired focus determined based on an input operation.
The method according to claim 1, wherein a preset priority of each of the n preset ROI regions is associated with a size of a corresponding preset ROI region.
The method according to claim 8, wherein the determining the first ROI region from the n preset ROI regions according to a preset priority comprises:

Determining validity of the ROI target image corresponding to the n ROI regions in sequence according to a preset priority, and determining that the ROI target image corresponding to one ROI region is valid, determining the ROI region as the first ROI region.
A terminal comprising:

An acquisition unit configured to acquire a first image by using an image sensor;

a focusing unit configured to perform initial focusing on the first image acquired by the collecting unit by using an initial ROI area;

a determining unit, configured to determine validity of the first ROI target image corresponding to the initial ROI region, where the first ROI target image is a partial image of the first image;

The determining unit is configured to: if the determining unit determines that the first ROI target image is invalid, determine a first ROI region from the n preset ROI regions according to a preset priority, the first ROI region Corresponding second ROI target image is valid, the second ROI target image is a partial image of the first image, and the first ROI target image is not completely identical to the second ROI target image, wherein n is a pre- Setting a value, n is greater than or equal to 1; and determining a current phase difference value corresponding to the first ROI region;

The focusing unit is further configured to achieve focusing according to the current phase difference value determined by the determining unit.
The terminal according to claim 10, wherein the terminal further comprises: a calculating unit;

The calculating unit is configured to calculate a credibility value corresponding to the ROI region;

The determining unit is configured to compare the value of the credibility value calculated by the calculating unit with a preset threshold, and determine the validity of the ROI target image corresponding to the ROI region based on the comparison result.
The terminal according to claim 11, wherein

The determining unit is further configured to determine that the ROI target image is invalid if the credibility value is less than a preset threshold, and determine that the ROI target image is valid if the credibility value is greater than or equal to the preset threshold. .
The terminal according to claim 10, wherein

The determining unit is configured to determine the current phase difference value according to a distance between a first pixel corresponding to the second ROI target image and a preset shadow pixel.
The terminal according to claim 10, wherein the terminal further comprises: a detecting unit and a displacement unit;

The detecting unit is configured to detect whether the current phase difference value belongs to a preset phase difference value range, where the preset phase difference value range is a range of phase difference values for triggering the terminal to achieve phase focusing;

The displacement unit is configured to move the photographing motor to a target focus range corresponding to the current phase difference value if the detecting unit detects that the current phase difference value does not belong to the preset phase difference value range Inside;

The focusing unit is configured to adjust a position of the photographing motor within the target focus range to determine a target in-focus position in the first ROI region, thereby achieving focusing.
The terminal according to claim 10, wherein the focusing unit is configured to: when receiving the photographing instruction, output an area identifier corresponding to the initial ROI area in the display area, based on the area identifier corresponding to the initial ROI area The first image is initially focused.
The terminal according to any one of claims 10 to 15, wherein the initial ROI area is a preset area or an area of desired focus determined based on an input operation.
The terminal according to claim 10, wherein a preset priority of each of the n preset ROI regions is associated with a size of a corresponding preset ROI region.
The terminal according to claim 17, wherein the determining unit is configured to sequentially determine validity of the ROI target image corresponding to the n ROI regions according to a preset priority order, and determine an ROI region. When the corresponding ROI target image is valid, the ROI area is determined as the first ROI area.
A terminal, comprising: a processor and a memory for storing a computer program executable on the processor;

Wherein the processor is configured to perform the step of the focusing method according to any one of claims 1 to 9 when the computer program is run.
A computer storage medium having stored therein computer executable instructions for performing the focusing method of any one of claims 1 to 9.