CN105912704B

CN105912704B - Picture screening method and device

Info

Publication number: CN105912704B
Application number: CN201610268410.3A
Authority: CN
Inventors: 吴苗
Original assignee: Xinyu Xingbang Information Industry Co ltd
Current assignee: XINYU XINGBANG INFORMATION INDUSTRY Co.,Ltd.
Priority date: 2016-04-27
Filing date: 2016-04-27
Publication date: 2020-05-05
Anticipated expiration: 2036-04-27
Also published as: CN105912704A

Abstract

The invention provides a picture screening method, which is applied to a mobile terminal and comprises the following steps: acquiring a thumbnail of a reference picture; acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures; acquiring the gray average value of each thumbnail in the thumbnail set; judging whether the gray average value of each thumbnail exceeds a gray threshold value; and displaying the picture corresponding to the thumbnail according to the judgment result. The invention also provides a picture screening device. The picture screening method and the picture screening device provided by the invention provide a series of picture sets shot by a user in the same time period by acquiring pictures similar to a reference picture currently selected by the user, determine a gray threshold value through the existing environmental parameters which are the same as or similar to the reference picture selected by the user in a picture library, and compare and sort the gray values of the pictures in the picture sets with the gray threshold value to obtain the quality sorting of the pictures shot in the same time period so as to assist the user in deleting the pictures with low quality.

Description

Picture screening method and device

Technical Field

The invention relates to the field of picture processing, in particular to a picture screening method and a picture screening device.

Background

Electronic equipment shoots the function powerful day by day, and the photo that the user stored is more and more, and occupation memory is bigger and bigger, especially can shoot many similar photos when taking a candid photograph or taking a film. The user often needs to repeatedly switch and look at the contrast picture if the user wants to select the most satisfactory one of the similar pictures, which is inefficient. The photos taken by a candid camera or continuously taken by a candid camera are often high in similarity and difficult to distinguish differences, and the photo effect is influenced by the quality of a display screen of the electronic equipment, so that errors can be caused in naked eye judgment.

Disclosure of Invention

The invention mainly aims to provide a picture screening method and a picture screening device, and aims to solve the technical problem that the operation of screening pictures is complex.

In order to achieve the above object, the present invention provides a picture screening method applied to a mobile terminal, the method comprising: acquiring a thumbnail of a reference picture; acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures; acquiring the gray average value of each thumbnail in the thumbnail set; judging whether the gray average value of each thumbnail exceeds a gray threshold value; and displaying the picture corresponding to the thumbnail according to the judgment result.

Optionally, the step of obtaining a thumbnail set meeting a preset condition according to the thumbnail of the reference picture includes: acquiring front N pictures and rear M pictures of a reference picture; judging whether the similarity between the thumbnails of the N + M pictures and the thumbnail of the reference picture meets a preset condition or not; and selecting the thumbnails meeting preset conditions in the N + M thumbnail zooming images to form a thumbnail set.

Optionally, the step of acquiring the first N pictures and the last M pictures of the reference picture includes: acquiring a generation time point of a reference picture; and acquiring N pictures according to a first time period before the time point, and acquiring M pictures according to a second time period after the time point.

Optionally, the step of acquiring a thumbnail of the reference picture includes: receiving an operation instruction of a user in the process of shooting a picture or in a picture preview mode; determining a picture currently being shot or a picture being previewed as a reference picture according to the operation instruction; and acquiring a corresponding thumbnail according to the reference picture.

Optionally, the grayscale threshold is determined according to grayscale values of other pictures in the gallery.

The present invention also provides a picture screening apparatus, comprising: the thumbnail module is used for acquiring a thumbnail of a reference picture; the screening module is used for acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures; the gray value calculation module is used for acquiring the gray average value of each thumbnail in the thumbnail set; the judging module is used for judging whether the gray average value of each thumbnail exceeds a gray threshold value; and the display module is used for displaying the picture corresponding to the thumbnail according to the judgment result.

Optionally, the screening module comprises: the image capturing unit is used for acquiring the front N images and the rear M images of the reference image; the similarity judging unit is used for judging whether the similarity between the thumbnails of the N + M pictures and the thumbnails of the reference pictures meets a preset condition or not; and the screening unit is used for selecting the thumbnails meeting the preset conditions in the N + M thumbnail zooming images to form a thumbnail set.

Optionally, the screening module further comprises: a time point acquisition unit configured to acquire a generation time point of a reference picture; and the screening unit is also used for acquiring N pictures according to a first time period before the time point and acquiring M pictures according to a second time period after the time point.

Optionally, the thumbnail module includes: the receiving unit is used for receiving an operation instruction of a user in the process of taking a picture or in a picture preview mode; the selecting unit is used for determining the picture currently shot or the picture previewing currently shot as a reference picture according to the operation instruction; and the thumbnail unit is used for acquiring the corresponding thumbnail according to the reference picture.

The picture screening method provided by the invention provides a series of picture sets shot in the same time period by a user by obtaining pictures similar to a reference picture currently selected by the user, wherein the time period can be 1 minute or a plurality of pictures formed by continuous shooting at one time, a gray threshold value is determined by the existing environmental parameters which are the same as or similar to the reference picture selected by the user in a picture library, and the gray value of the pictures in the picture sets is compared with the gray threshold value for sequencing to obtain the quality sequencing of the pictures shot in the same time period so as to assist the user to delete the pictures with low quality.

Drawings

Fig. 1 is a schematic diagram of a hardware structure of an alternative mobile terminal for implementing various embodiments of the present invention;

FIG. 2 is a diagram of a wireless communication system for the mobile terminal shown in FIG. 1;

FIG. 3 is a flowchart illustrating a first exemplary embodiment of a method for image screening according to the present invention;

FIG. 4 is a flowchart illustrating a second embodiment of a method for image screening according to the present invention;

FIG. 5 is a flowchart illustrating a third exemplary embodiment of a method for image screening according to the present invention;

FIG. 6 is a flowchart illustrating a step 520 of a third embodiment of a method for image filtering according to the present invention;

fig. 7 is a schematic diagram of functional modules of an embodiment of the image screening apparatus according to the present invention.

The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A mobile terminal implementing various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.

The mobile terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a navigation device, and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. In the following, it is assumed that the terminal is a mobile terminal. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for moving purposes.

Fig. 1 is a schematic diagram of an alternative mobile terminal hardware architecture for implementing various embodiments of the present invention.

The mobile terminal 100 may include a wireless communication unit 110, a user input unit 120, a sensing unit 130, an output unit 140, a memory 150, a controller 160, and a power supply unit 170, and the like. Fig. 1 illustrates a mobile terminal having various components, but it is to be understood that not all illustrated components are required to be implemented. More or fewer components may alternatively be implemented. Elements of the mobile terminal will be described in detail below.

The wireless communication unit 110 typically includes one or more components that allow radio communication between the mobile terminal 100 and a wireless communication system or network. For example, the wireless communication unit may include at least one of a mobile communication module 111 and a wireless internet module 112.

The mobile communication module 111 transmits and/or receives radio signals to and/or from at least one of a base station (e.g., access point, 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 according to text and/or multimedia messages.

The wireless internet module 112 supports wireless internet access of the mobile terminal. The module may be internally or externally coupled to the terminal. The wireless internet access technology to which the module relates may include WLAN (wireless LAN) (Wi-Fi), Wibro (wireless broadband), Wimax (worldwide interoperability for microwave access), HSDPA (high speed downlink packet access), and the like.

The user input unit 120 may generate key input data to control various operations of the mobile terminal according to a command input by a user. The user input unit 120 allows a user to input various types of information, and may include a keyboard, dome sheet, touch pad (e.g., a touch-sensitive member that detects changes in resistance, pressure, capacitance, and the like due to being touched), scroll wheel, joystick, and the like. In particular, when the touch pad is superimposed on the display unit 141 in the form of a layer, a touch screen may be formed.

The sensing unit 130 detects a current state of the mobile terminal 100 (e.g., an open or closed state of the mobile terminal 100), a position of the mobile terminal 100, presence or absence of contact (i.e., touch input) by a user with the mobile terminal 100, an orientation of the mobile terminal 100, acceleration or deceleration movement and direction of the mobile terminal 100, and the like, and generates a command or signal for controlling an operation of the mobile terminal 100.

The output unit 140 may include a display unit 141 and the like.

The display unit 141 may display information processed in the mobile terminal 100. For example, when the mobile terminal 100 is in a phone call mode, the display unit 141 may display a User Interface (UI) or a Graphical User Interface (GUI) related to a call or other communication (e.g., text messaging, multimedia file downloading, etc.). When the mobile terminal 100 is in a video call mode or an image capturing mode, the display unit 141 may display a captured image and/or a received image, a UI or GUI showing a video or an image and related functions, and the like.

Meanwhile, when the display unit 141 and the touch pad are stacked on each other in the form of layers to form a touch screen, the display unit 141 may function as an input device and an output device. The display unit 141 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 transparent displays, and a typical transparent display may be, for example, a TOLED (transparent organic light emitting diode) display or the like. Depending on the particular desired implementation, 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 may be used to detect a touch input pressure as well as a touch input position and a touch input area.

The memory 150 may store software programs and the like for processing and controlling operations performed by the controller 160, or may temporarily store data (e.g., a phonebook, messages, still images, videos, and the like) that has been or is to be output. Also, the memory 150 may store data regarding various ways of vibration and audio signals output when a touch is applied to the touch screen.

The memory 150 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, and the like. Also, the mobile terminal 100 may cooperate with a network storage device that performs a storage function of the memory 150 through a network connection.

The controller 160 generally controls the overall operation of the mobile terminal. For example, the controller 160 performs control and processing related to voice calls, data communications, video calls, and the like. The controller 160 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 170 receives external power or internal power and provides appropriate power required to operate the respective elements and components under the control of the controller 160.

The various embodiments described herein may be implemented in a computer-readable medium using, for example, computer software, hardware, or any combination thereof. For a hardware implementation, the embodiments described herein may be implemented using at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, an electronic unit designed to perform the functions described herein, and in some cases, such embodiments may be implemented in the controller 160. For a software implementation, the implementation such as a process or a function may be implemented with a separate software module that allows performing at least one function or operation. The software codes may be implemented by software applications (or programs) written in any suitable programming language, which may be stored in memory 150 and executed by controller 160.

Up to this point, mobile terminals have been described in terms of their functionality. Hereinafter, a slide-type mobile terminal among various types of mobile terminals, such as a folder-type, bar-type, swing-type, slide-type mobile terminal, and the like, will be described as an example for the sake of brevity. Accordingly, 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 100 as shown in fig. 1 may be configured to operate with communication systems such as wired and wireless communication systems and satellite-based communication systems that transmit data via frames or packets.

A communication system in which a mobile terminal according to the present invention is operable will now be described with reference to fig. 2.

Such communication systems may use different air interfaces and/or physical layers. For example, the air interface used by the communication system includes, 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), and the like. By way of 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, the CDMA wireless communication system may include a plurality of mobile terminals 100, a plurality of Base Stations (BSs) 270, Base Station Controllers (BSCs) 275, and a Mobile Switching Center (MSC) 280. The MSC280 is configured to interface with a Public Switched Telephone Network (PSTN) 290. The MSC280 is also configured to interface with a BSC275, which may be coupled to the base station 270 via a backhaul. The backhaul may be constructed according to any of several known interfaces including, for example, E1/T1, ATM, IP, PPP, frame Relay, HDSL, ADSL, or xDSL. It will be understood that a system as shown in fig. 2 may include multiple BSCs 275.

Each BS270 may serve one or more sectors (or regions), each sector covered by a multi-directional antenna or an antenna pointing in a particular direction being radially distant from the BS 270. Alternatively, each partition may be covered by two or more antennas for diversity reception. Each BS270 may be configured to support multiple frequency allocations, with each frequency allocation having a particular frequency spectrum (e.g., 1.25MHz,5MHz, etc.).

The intersection of partitions with frequency allocations may be referred to as a CDMA channel. The BS270 may also be referred to as a Base Transceiver Subsystem (BTS) or other equivalent terminology. In such a case, the term "base station" may be used to generically refer to a single BSC275 and at least one BS 270. The base stations may also be referred to as "cells". Alternatively, each sector of a particular BS270 may be referred to as a plurality of cell sites.

As shown in fig. 2, a Broadcast Transmitter (BT)295 transmits a broadcast signal to the mobile terminal 100 operating within the system. In fig. 2, several Global Positioning System (GPS) satellites 300 are shown. The satellite 300 assists in locating at least one of the plurality of mobile terminals 100.

In fig. 2, a plurality of satellites 300 are depicted, but it is to be understood that any number of satellites may be utilized to obtain useful positioning information in lieu of or in addition to GPS tracking technology, other technologies that can track the position of a mobile terminal may be used. In addition, at least one GPS satellite 300 may selectively or additionally process satellite DMB transmission.

As a typical operation of the wireless communication system, the BS270 receives reverse link signals from various mobile terminals 100. The mobile terminal 100 is generally engaged in conversations, messaging, and other types of communications. Each reverse link signal received by a particular base station 270 is processed within the particular BS 270. The obtained data is forwarded to the associated BSC 275. The BSC provides call resource allocation and mobility management functions including coordination of soft handoff procedures between BSs 270. The BSCs 275 also route the received data to the MSC280, which provides additional routing services for interfacing with the PSTN 290. Similarly, the PSTN290 interfaces with the MSC280, the MSC interfaces with the BSCs 275, and the BSCs 275 accordingly control the BS270 to transmit forward link signals to the mobile terminal 100.

Based on the above mobile terminal hardware structure and communication system, various embodiments of the present invention are proposed.

Referring to fig. 3, a picture screening method according to a first embodiment of the present invention is applied to a mobile terminal, where the mobile terminal is configured with a touch screen, and a user may input an operation instruction to the mobile terminal through the touch screen to control the mobile terminal to perform a corresponding operation, and when the user performs picture screening by using the picture screening method provided by the present invention, the user may quickly locate one or more groups of currently-photographed pictures and sort the pictures according to their quality for the user to delete the pictures, and when the picture screening method provided by the present invention is applied to perform picture screening, the method includes the following steps:

in step S310, a thumbnail of a reference picture is acquired.

The operating system of the mobile terminal is provided with a gallery function, and the gallery function is used for storing photos taken by a user. When a user can click a corresponding icon to enter a picture library to browse the picture in the photographing process or through a touch screen, the mobile terminal determines the picture at the coordinate position of the user touch point according to the user touch point fed back by the touch screen, determines the picture as a reference picture, and acquires a corresponding thumbnail according to the reference picture.

And step S330, acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures.

After the mobile terminal determines the thumbnail of the reference picture, the other pictures are compared with the reference picture in the picture library, the similarity between the other pictures and the reference picture is judged, the pictures with the similarity in a specific range are screened and collected, and the thumbnails of the pictures meeting the conditions are collected into a thumbnail set, so that a series of pictures in a specific time for generating the reference picture are screened out for further operation of a user in subsequent steps.

And step S350, acquiring the gray level average value of each thumbnail in the thumbnail set.

The mobile terminal obtains thumbnail data in the thumbnail set through an IMread function, then converts the thumbnail into a gray mode to obtain a gray matrix, and further obtains a gray value of each pixel point of the thumbnail.

Step S370, judging whether the gray level average value of each thumbnail exceeds a gray level threshold value, if the gray level average value of each thumbnail does not exceed the gray level threshold value, entering step 390; and if the average grayscale value of the thumbnail exceeds the grayscale threshold value, deleting the photo.

In the present embodiment, the thumbnail is equally divided into 64(8 × 8) image areas, and the average value of the pixel gradations of each of the 64 image areas is calculated. The gray threshold is determined by the mobile terminal through the following steps:

step 1, obtaining environmental parameters when a reference picture is shot.

Specifically, when the mobile terminal takes a picture according to an instruction of a user, the current shooting location is acquired through the GPS, and the weather condition of the current location is acquired through the network according to the location information acquired by the GPS, for example: and recording the shooting time of the current picture on cloudy days, sunny days, snow days or haze and the like. The mobile terminal adds information such as a shooting place, weather parameters and time of a currently shot picture to Exif information of the picture. After the mobile terminal determines the reference picture according to the operation instruction of the user, a built-in program function of the mobile terminal acquires the shooting place, the environmental parameters and the shooting time of the reference picture.

And 2, acquiring other standard pictures matched with the environmental parameters according to the environmental parameters when the reference picture is shot.

After the mobile terminal obtains the environmental parameters of the reference picture during shooting, the mobile terminal traverses the environmental parameters of the pictures in the picture library, compares the environmental parameters of other pictures in the picture library with the environmental parameters of the reference picture, and determines the picture with the minimum difference with the environmental parameters of the reference picture as the standard picture. In other embodiments, the mobile terminal displays the pictures in the display interface in an order according to the difference, and the user actively selects the standard pictures through the touch screen.

And 3, calculating the gray average value of the standard picture, and taking the gray average value as a gray threshold value.

The mobile terminal obtains a thumbnail corresponding to a standard picture, equally divides the thumbnail into 64(8x8) image areas, further calculates the gray value of each pixel in each image area, then calculates the pixel gray average value of the image area according to the gray value of each pixel, and adds or subtracts a preset value on the basis of the pixel gray average value of a reference picture to obtain a gray threshold. In other embodiments, the number of image regions divided for the standard picture may be other values, and the specific value should be consistent with the number of image regions divided for each thumbnail when calculating the average value of the gray levels of each thumbnail in the thumbnail set.

After the gray threshold is determined through the steps 1 to 3, when whether the gray average value of each thumbnail exceeds the gray threshold is calculated, the gray average value of each image area of the thumbnail to be compared is compared with the corresponding gray threshold of the image area in the standard picture, so as to determine whether the gray average value of each image area of the thumbnail to be compared is within the range of the gray threshold.

And step 390, displaying the picture corresponding to the thumbnail according to the judgment result.

In the embodiment, each image area of each thumbnail in the thumbnail set is compared with the grayscale threshold of the corresponding image area in the standard picture, sorting is performed according to the number of image areas meeting the grayscale threshold, and the thumbnail with the most image areas meeting the grayscale threshold is arranged at the head and sorted in a descending manner. If the number of the image areas meeting the gray threshold is the same, in order to more accurately sort the pictures, the mobile terminal sorts the pictures according to the number of the image areas meeting the gray threshold contained in the focusing area of the pictures, so that the displayed pictures are more suitable for the intention of the user.

After the arrangement sequence of the thumbnails is judged, the mobile terminal jumps to a display interface to display the pictures corresponding to the thumbnails. In this embodiment, the mobile terminal provides an option of deleting the picture, and the user can directly delete the picture in the display interface.

According to the first embodiment of the picture screening method provided by the invention, a series of picture sets shot in the same time period by a user are provided by acquiring pictures similar to a reference picture currently selected by the user, the time period can be 1 minute or a plurality of pictures formed by continuous shooting at one time, a gray threshold is determined according to the existing environmental parameters which are the same as or similar to the reference picture selected by the user in a picture library, and the gray values of the pictures in the picture sets are compared with the gray threshold and sorted to obtain the quality sorting of the pictures shot in the same time period so as to assist the user in deleting the pictures with low quality.

Referring to fig. 4, a picture screening method according to a second embodiment of the present invention is applied to a mobile terminal, and includes the following steps:

step 410, receiving an operation instruction of a user in the process of taking a picture or in a picture preview mode.

The mobile terminal is provided with a pressure sensor, and a user can input an operation instruction through a touch screen and/or the pressure sensor. In the process of shooting the picture, the user applies pressure exceeding a preset pressure value while triggering the shooting virtual key. In other embodiments, the user clicks on the virtual option to enter an operation instruction when entering the gallery and clicking on the picture to enter the preview mode.

And step 420, determining the picture currently being shot or the picture being previewed as a reference picture according to the operation instruction.

In the process of shooting a picture, the mobile terminal judges whether the user applies pressure exceeding a preset pressure value when receiving a virtual key triggered by the user, if the mobile terminal receives the pressure exceeding the preset pressure value input by the user, a mark bit is added to the currently shot picture to be used as a reference picture, and a preview window is arranged in the current shooting picture of the mobile terminal and used for displaying a thumbnail marked as the reference picture.

In other embodiments, the user may still apply a pressure operation exceeding a preset pressure value when taking other pictures, at which time the mobile terminal replaces the last reference picture with the picture as the latest reference picture.

In other embodiments, when the user takes another picture, the user may apply a pressure operation exceeding a preset pressure value, the mobile terminal adds a flag bit to the picture as a second reference picture according to the pressure operation instruction, the previous reference picture is a first reference picture, and the first reference picture and the second reference picture are stored together for the user to further operate.

And step 430, acquiring a corresponding thumbnail according to the reference picture.

The mobile terminal detects an input instruction of a user for selecting the thumbnail displayed in the preview window in the shooting interface so as to obtain the thumbnail of the reference picture. When the thumbnails marked as the reference pictures exist, after the mobile terminal detects an input instruction of a user, the thumbnails are displayed in a pop-up window mode, the user further selects a specific displayed thumbnail to determine the thumbnail as the reference picture selected by the user, and the thumbnail of the reference picture is obtained.

And step S440, acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures.

After the mobile terminal determines the thumbnail of the reference picture, the other pictures are compared with the reference picture in the picture library, the similarity between the other pictures and the reference picture is judged, the pictures with the similarity within a specific range are screened and collected, and the thumbnails of the pictures meeting the conditions are collected into a thumbnail set, so that the pictures shot in the same shooting process with the reference picture are obtained.

And step S450, acquiring the gray average value of each thumbnail in the thumbnail set.

The mobile terminal obtains thumbnail data in the thumbnail set through a function, converts the thumbnail into a gray mode to obtain a gray matrix, and calculates the gray value of the thumbnail.

Step S460, judging whether the gray average value of each thumbnail exceeds a gray threshold value, and if the gray average value of each thumbnail does not exceed the gray threshold value, entering step S470; if the average grayscale value of the thumbnail exceeds the grayscale threshold, the thumbnail is removed from the thumbnail set.

And step S470, displaying the picture corresponding to the thumbnail according to the judgment result.

According to the second embodiment of the picture screening method provided by the invention, the user applies the pressure operation exceeding the preset pressure value when the photographing virtual key is triggered, and the currently photographed picture is marked as the reference picture.

Referring to fig. 5, a picture screening method provided in a third embodiment of the present invention is applied to a mobile terminal, and includes the following steps:

in step S510, a thumbnail of a reference picture is acquired.

The operating system of the mobile terminal is provided with a gallery function, and the gallery function is used for storing pictures shot by a user. The method comprises the steps that when a user can take a picture or click a corresponding icon through a touch screen to enter a picture library to browse the picture, the mobile terminal determines the picture at the coordinate position of a user touch point according to the user touch point fed back by the touch screen, the picture is determined as a reference picture, and the mobile terminal obtains a corresponding thumbnail according to the reference picture.

In step S520, N pictures before and M pictures after the reference picture are obtained.

The mobile terminal may determine the front N pictures and the rear M pictures in the following manner, as shown in fig. 6, specifically including:

in step S521, the generation time point of the reference picture is acquired.

The mobile terminal collects a series of information in the shooting process, and the information is placed at the head of a picture file to form EXIF information, wherein the EXIF information comprises shooting date, shooting equipment, shooting parameters, image processing parameters, thumbnails and other related information. And the mobile terminal reads the EXIF information of the reference picture according to the reference picture determined by the user and acquires the generation time point of the reference picture.

In step S522, the first N pictures are obtained according to a first time period before the time point, and the last M pictures are obtained according to a second time period after the time point.

In this embodiment, the first time period and the second time period are the same, the mobile terminal searches other pictures in the picture library, determines whether the generation time point of the picture falls within a time range determined by the generation time point of the reference picture, the first time period and the second time period according to the EXIF information of the other pictures, and acquires the picture if the generation time point of the picture falls within the time range. The first time period and the second time period can be set by a user, and the numerical values of the first time period and the second time period can be different.

In other embodiments, the mobile terminal records a first time point when the user opens the photographing application interface, and when the user exits the photographing application interface, the mobile terminal records a second time point when the user exits the photographing application interface. And the mobile terminal screens the pictures with the generation time in the time period according to the time period determined by the generation time point of the reference picture, the first time point and the second time point.

Step S530, judging whether the similarity between the thumbnails of the N + M pictures and the thumbnail of the reference picture meets a preset condition, if so, entering step S550; if not, skipping the picture.

The thumbnail is equally divided into 64(8 × 8) image areas, the average pixel gradation value of each of the 64 image areas is calculated, and the average pixel gradation value of each of the 64 image areas of the thumbnail of the reference picture and the average pixel gradation value of each of the 64 image areas of the thumbnail corresponding to each of the N + M pictures are calculated in this manner. And comparing the pixel gray level average value of each image area in the 64 image areas of the N + M thumbnails to be compared with the pixel gray level average value of each image area in the 64 image areas of the thumbnail of the reference picture one by one. And if the difference value of the pixel gray level average value of each image area of the thumbnail to be compared with the pixel gray level average value of each image area of the thumbnail of the reference picture is judged to be within the preset difference threshold value, the thumbnail of the currently compared picture is judged to be similar to the thumbnail of the reference picture.

In step S540, thumbnails of the N + M thumbnail images that satisfy a preset condition are selected to form a thumbnail image set.

And screening out the thumbnails similar to the reference picture in the N + M thumbnail to form a thumbnail set.

And step S550, acquiring the gray level average value of each thumbnail in the thumbnail set.

Step S560, judging whether the gray average value of each thumbnail exceeds a gray threshold value, if not, entering step S570; if the average grayscale value of the thumbnail exceeds the grayscale threshold, the thumbnail is removed from the thumbnail set.

And step S570, displaying the picture corresponding to the thumbnail according to the judgment result.

By the picture screening method provided by the third embodiment of the present invention, the mobile terminal determines the thumbnail set similar to the thumbnail of the reference picture by acquiring the time points when the user enters and exits the photographing application, and because the photographed landscape, composition, and the like have large similarities in one photographing time period, the speed of positioning the thumbnail similar to the thumbnail of the reference picture can be increased by the picture screening method provided by the third embodiment.

Referring to fig. 7, an embodiment of the image screening apparatus according to the present invention provides an image screening apparatus, including:

and the thumbnail module is used for acquiring a thumbnail of the reference picture.

In one embodiment, a gallery function is provided in an operating system of the mobile terminal, and the gallery is used for storing photos taken by a user. When a user can click a corresponding icon to enter a picture library to browse the picture in the photographing process or through a touch screen, the mobile terminal determines the picture at the coordinate position of the user touch point according to the user touch point fed back by the touch screen, determines the picture as a reference picture, and the thumbnail module acquires a corresponding thumbnail according to the reference picture.

Specifically, the thumbnail module includes a receiving unit, a selecting unit, and a thumbnail unit, wherein,

and the receiving unit is used for receiving an operation instruction of a user in the process of taking a picture or in a picture preview mode.

Specifically, the receiving unit comprises an input device such as a mobile terminal configuration pressure sensor and a touch screen, and a user can input an operation instruction through the touch screen and/or the pressure sensor. In the process of shooting the picture, the user applies pressure exceeding a preset pressure value while triggering the shooting virtual key. In other embodiments, the user clicks on the virtual option to enter an operation instruction when entering the gallery and clicking on the picture to enter the preview mode.

And the selecting unit is used for determining the picture currently shot or the picture previewing as the reference picture according to the operation instruction.

Specifically, in the process of shooting a picture, the mobile terminal judges whether a pressure exceeding a preset pressure value is applied by a user when the user triggers a shooting virtual key is received, if the mobile terminal receives the pressure exceeding the preset pressure value input by the user, the selecting unit adds a flag bit to the currently shot picture to be used as a reference picture, and the selecting unit is configured as a preview window in the currently shot picture of the mobile terminal and displays a thumbnail marked as the reference picture.

In other embodiments, the user may still apply a pressure operation exceeding a preset pressure value when taking another picture, and at this time, the selecting unit replaces the last reference picture with the picture to which the flag is added as the latest reference picture.

In other embodiments, when the user takes another picture, the user may apply a pressure operation exceeding a preset pressure value, the selecting unit adds a flag bit to the picture as a second reference picture according to the pressure operation instruction, the previous reference picture is a first reference picture, and the first reference picture and the second reference picture are stored together for the user to further operate

And the thumbnail unit is used for acquiring the corresponding thumbnail according to the reference picture.

Specifically, the thumbnail unit detects an input instruction of a user to select a thumbnail displayed in a preview window within a photographing interface to acquire the thumbnail of a reference picture. When a plurality of images are marked as thumbnails of reference images, after the mobile terminal detects an input instruction of a user, the thumbnail unit displays the plurality of thumbnails in a popup window mode, the user further selects a specific displayed thumbnail to determine the thumbnail as the reference image selected by the user, and the thumbnail of the reference image is obtained.

And the screening module is used for acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures.

After the thumbnail of the reference picture is determined by the thumbnail module, the screening module compares other pictures with the reference picture in the picture library, judges the similarity between the other pictures and the reference picture, screens and collects the pictures with the similarity in a specific range, and collects the thumbnails of the pictures meeting the conditions into a thumbnail set, so as to screen a series of pictures within a specific time period for generating the reference picture, and further operate the users in subsequent steps, wherein the screening module specifically comprises:

and the picture capturing unit is used for acquiring the front N pictures and the rear M pictures of the reference picture.

A time point acquisition unit for acquiring a generation time point of the reference picture.

The mobile terminal collects a series of information in the shooting process, and the information is placed at the head of a picture file to form EXIF information, wherein the EXIF information comprises shooting date, shooting equipment, shooting parameters, image processing parameters, thumbnails and other related information. The time point acquisition unit reads EXIF information of a reference picture determined by a user according to the reference picture, and acquires a generation time point of the reference picture.

And the screening unit is also used for acquiring N pictures according to a first time period before the time point and acquiring M pictures according to a second time period after the time point.

In this embodiment, the first time period and the second time period are the same, the filtering unit searches other pictures in the picture library, determines whether the generation time point of the picture falls within a time range determined by the generation time point of the reference picture, the first time period and the second time period based on the EXIF information of the other pictures, and acquires the picture if the generation time point of the picture falls within the time range. The first time period and the second time period can be set by a user, and the numerical values of the first time period and the second time period can be different.

In other embodiments, the screening unit records a first time point when the user opens the photographing application interface, and when the user exits the photographing application interface, the screening unit records a second time point when the user exits the photographing application interface. The filtering unit filters a picture of which the generation time is in the time period according to the time period determined by the generation time point, the first time point and the second time point of the reference picture.

And the similarity judging unit is used for judging whether the similarity between the thumbnails of the N + M pictures and the thumbnails of the reference pictures meets the preset condition or not.

And the screening unit is further used for selecting the thumbnails meeting the preset conditions in the N + M thumbnail zooming images to form a thumbnail set. And screening out the thumbnails similar to the reference picture in the N + M thumbnail to form a thumbnail set.

And the gray value calculation module is used for acquiring the gray average value of each thumbnail in the thumbnail set.

And the judging module is used for judging whether the gray average value of each thumbnail exceeds a gray threshold value.

And the display module is used for displaying the picture corresponding to the thumbnail according to the judgment result.

The picture screening apparatus provided in this embodiment provides a series of picture sets taken by a user in the same time period by obtaining pictures similar to a reference picture currently selected by the user, where the time period may be 1 minute or multiple pictures formed by continuous shooting at one time, determines a gray threshold according to an existing environmental parameter in a gallery that is the same as or similar to the reference picture selected by the user, compares and sorts gray values of pictures in the picture set with the gray threshold to obtain quality ranks of pictures taken in the same time period, so as to assist the user in deleting pictures with low quality

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A picture screening method is applied to a mobile terminal, and is characterized by comprising the following steps:

acquiring a thumbnail of a reference picture;

acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures;

acquiring the gray average value of each thumbnail in the thumbnail set;

judging whether the gray average value of each thumbnail exceeds a gray threshold value or not;

displaying the picture corresponding to the thumbnail according to the judgment result;

wherein the method further comprises:

acquiring environmental parameters when the reference picture is shot; acquiring other standard pictures matched with the environmental parameters according to the environmental parameters of the reference picture during shooting; and calculating the gray average value of the standard picture, and taking the gray average value as a gray threshold value.

2. The picture screening method according to claim 1, wherein the step of acquiring a set of thumbnails meeting a preset condition according to the thumbnails of the reference picture comprises:

acquiring front N pictures and rear M pictures of the reference picture;

judging whether the similarity between the thumbnails of the N + M pictures and the thumbnail of the reference picture meets the preset condition or not;

and selecting the thumbnails meeting the preset condition from the N + M thumbnails to form the thumbnail set.

3. The picture screening method according to claim 2, wherein the step of acquiring the first N pictures and the last M pictures of the reference picture comprises:

acquiring a generation time point of the reference picture;

and acquiring the N pictures according to a first time period before the time point, and acquiring the M pictures according to a second time period after the time point.

4. The picture screening method according to claim 1, wherein the step of acquiring the thumbnail of the reference picture includes:

receiving an operation instruction of a user in the process of shooting a picture or in a picture preview mode;

determining the picture currently shot or the picture previewing currently shot as the reference picture according to the operation instruction;

and acquiring a corresponding thumbnail according to the reference picture.

5. An image screening apparatus, comprising:

the thumbnail module is used for acquiring a thumbnail of a reference picture;

the screening module is used for acquiring a thumbnail set meeting preset conditions according to the thumbnails of the reference pictures;

the gray value calculation module is used for acquiring the gray average value of each thumbnail in the thumbnail set;

the judging module is configured to judge whether the average grayscale value of each thumbnail exceeds a grayscale threshold, where the grayscale threshold specifically includes: acquiring environmental parameters when the reference picture is shot; acquiring other standard pictures matched with the environmental parameters according to the environmental parameters of the reference picture during shooting; calculating the gray average value of the standard picture, and taking the gray average value as a gray threshold value;

6. The picture screening apparatus of claim 5, wherein the screening module comprises:

the image capturing unit is used for acquiring the front N images and the rear M images of the reference image;

the similarity judging unit is used for judging whether the similarity between the thumbnails of the N + M pictures and the thumbnail of the reference picture meets the preset condition or not;

and the screening unit is used for selecting the thumbnails meeting the preset conditions from the N + M thumbnails to form the thumbnail set.

7. The picture screening apparatus of claim 6, wherein the screening module further comprises:

a time point acquisition unit configured to acquire a generation time point of the reference picture;

and the screening unit is further used for acquiring the N pictures according to a first time period before the time point and acquiring the M pictures according to a second time period after the time point.

8. The picture screening apparatus of claim 5, wherein the thumbnail module includes:

the receiving unit is used for receiving an operation instruction of a user in the process of taking a picture or in a picture preview mode;

the selecting unit is used for determining the picture currently shot or the picture previewing at present as the reference picture according to the operation instruction;

and the thumbnail unit is used for acquiring a corresponding thumbnail according to the reference picture.