CN107872622B

CN107872622B - Close-range imaging method and mobile terminal

Info

Publication number: CN107872622B
Application number: CN201711191041.3A
Authority: CN
Inventors: 廖黎
Original assignee: Guangdong Genius Technology Co Ltd
Current assignee: Guangdong Genius Technology Co Ltd
Priority date: 2017-11-24
Filing date: 2017-11-24
Publication date: 2020-12-25
Anticipated expiration: 2037-11-24
Also published as: CN107872622A

Abstract

A method and a mobile terminal for close-range imaging comprise the following steps: the mobile terminal can determine whether to start the black-and-white fixed-focus camera or not by judging whether the shot object is in the object distance range capable of clearly imaging or not, and if so, the black-and-white fixed-focus camera is started and shooting operation is executed. Under the application scene of close-range shooting, the mobile terminal can present clear shooting images in the shortest time through the quick focusing characteristic of the black and white fixed-focus camera; the mobile terminal also presents more image details through the characteristics of large photosensitive area and high pixel size of a black-white sensor in the black-white fixed-focus camera, so that the quality of a black-white image shot by the black-white fixed-focus camera under the condition of the same sensor size is higher than that of a color image shot by the zoom camera, the image of the shot question is conveniently converted into test question content, and the identification degree of the image of the shot question is improved. By implementing the embodiment of the invention, the quality and the efficiency of short-distance imaging can be improved.

Description

Close-range imaging method and mobile terminal

Technical Field

The invention relates to the technical field of computers, in particular to a close-range imaging method and a mobile terminal.

Background

At present, students can use zoom cameras on home education machines or learning mobile phones to take short-distance test questions and can retrieve answers corresponding to the taken test questions. In practice, it is found that it takes a long time for students to perform close-range shooting by using a zoom camera of a family education machine or a learning mobile phone, and an image shot by using the zoom camera of the family education machine or the learning mobile phone is usually a color image, so that the color image needs to be binarized to be converted into a black-and-white image and then to be searched. In addition, since the pixel size and the light sensing area of the color sensor in the zoom camera are small, it is difficult for a captured image at a short distance to embody a large amount of image details. Obviously, the above-described photographing process not only reduces the efficiency of close-range imaging, but also reduces the quality of close-range imaging.

Disclosure of Invention

The embodiment of the invention discloses a close-range imaging method and a mobile terminal, which can improve the quality and efficiency of close-range imaging.

The embodiment of the invention discloses a method for short-distance imaging in a first aspect, which comprises the following steps:

the method comprises the steps that a mobile terminal receives a starting instruction for starting a black and white fixed-focus camera in the mobile terminal;

the mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range;

if yes, the mobile terminal starts the black and white fixed-focus camera and controls the black and white fixed-focus camera to automatically focus;

the mobile terminal receives a shooting instruction input by a user and executes shooting operation to obtain a shot image.

As an optional implementation manner, in the first aspect of this embodiment of the present invention, the method further includes:

and if the mobile terminal detects that the distance between the shot object and the black-white fixed-focus camera is smaller than the minimum distance of the clear imaging object, the mobile terminal outputs first prompt information, and the first prompt information is used for prompting a user to control the black-white fixed-focus camera to be far away from the shot object.

if the mobile terminal detects that the distance between the shot object and the black-and-white fixed-focus camera is larger than the maximum distance of the clear imaging object, the mobile terminal outputs second prompt information, and the second prompt information is used for prompting a user whether the black-and-white fixed-focus camera needs to be switched to a zoom camera or not;

and if the mobile terminal detects the operation input by the user and used for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal starts the zoom camera.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, after the captured image is a subject image and the mobile terminal obtains the captured image, the method further includes:

the mobile terminal extracts original test question information from the shot image;

the mobile terminal detects whether at least one piece of advanced target test question information with the matching degree with the original test question information larger than a preset first matching degree exists in a test question database;

if the high-level target test question information exists, the mobile terminal determines a piece of high-level target test question information selected from the at least one piece of high-level target test question information by the user as the high-level target test question information to be inquired;

the mobile terminal acquires answer information corresponding to the advanced target test question information to be inquired;

and the mobile terminal outputs answer information corresponding to the advanced target test question information to be inquired.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, after the mobile terminal detects that at least one high-level target test question information whose matching degree with the original test question information is greater than a preset first matching degree does not exist in the test question database, the method further includes:

the mobile terminal identifies a target subject to which the original test question information belongs;

the mobile terminal detects whether at least one piece of middle-level target test question information with the matching degree with the original test question information larger than a preset second matching degree corresponding to the target subject exists in the test question database, wherein the preset second matching degree is smaller than the preset first matching degree;

if the intermediate-level target test question information exists, the mobile terminal determines a certain piece of intermediate-level target test question information selected from the at least one piece of intermediate-level target test question information by the user as the intermediate-level target test question information to be inquired;

the mobile terminal acquires answer information corresponding to the intermediate-level target test question information to be inquired;

and the mobile terminal outputs answer information corresponding to the intermediate-level target test question information to be inquired.

A second aspect of an embodiment of the present invention discloses a mobile terminal, including:

the receiving unit is used for receiving a starting instruction for starting a black and white fixed-focus camera in the mobile terminal;

the first detection unit is used for detecting whether the distance between a shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range or not;

the starting unit is used for starting the black-and-white fixed-focus camera and controlling the black-and-white fixed-focus camera to automatically focus after the first detection unit detects that the distance between the shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range;

the receiving unit is further used for receiving a shooting instruction input by a user and executing shooting operation so as to obtain a shot image.

As an optional implementation manner, in a second aspect of the embodiment of the present invention, the mobile terminal further includes:

the first detection unit is further used for detecting whether the distance between the shot object and the black and white fixed-focus camera is smaller than the minimum value of the distance between the clear imaging objects when the distance between the shot object and the black and white fixed-focus camera is not within the range of the distance between the clear imaging objects;

and the first output unit is used for outputting first prompt information when the first detection unit detects that the distance between the shot object and the black-white fixed-focus camera is smaller than the minimum distance of the clear imaging object, wherein the first prompt information is used for prompting a user to control the black-white fixed-focus camera to be far away from the shot object.

the first output unit is further configured to output second prompt information when the first detection unit detects that the distance between the shot object and the black-and-white fixed-focus camera is greater than the maximum distance of the clear imaging object, where the second prompt information is used to prompt a user whether the black-and-white fixed-focus camera needs to be switched to a zoom camera;

the starting unit is further configured to start the zoom camera by the mobile terminal when the mobile terminal detects an operation input by a user and used for switching the black-and-white fixed-focus camera to the zoom camera.

As an optional implementation manner, in a second aspect of the embodiment of the present invention, the captured image is a subject image, and the mobile terminal further includes:

an extracting unit configured to extract original test question information from the photographed image after the photographed image is obtained by the receiving unit;

the second detection unit is used for detecting whether at least one piece of high-level target test question information with the matching degree with the original test question information larger than a preset first matching degree exists in the test question database;

the determining unit is used for determining a piece of high-level target test question information selected from the high-level target test question information by the user as the high-level target test question information to be inquired after the second detecting unit detects that at least one piece of high-level target test question information with the matching degree with the original test question information larger than a preset first matching degree exists in the test question database;

the acquisition unit is used for acquiring answer information corresponding to the high-grade target test question information to be inquired;

and the second output unit is used for outputting answer information corresponding to the high-level target test question information to be inquired.

the identification unit is used for identifying the target subject to which the original test question information belongs after the second detection unit detects that at least one piece of high-level target test question information of which the matching degree with the original test question information is greater than a preset first matching degree does not exist in the test question database;

the second detection unit is further configured to detect whether at least one piece of intermediate-level target test question information, the matching degree of which with the original test question information is greater than a preset second matching degree corresponding to the target subject, exists in the test question database, and the preset second matching degree is smaller than the preset first matching degree;

the determining unit is further configured to determine, after the second detecting unit detects that at least one piece of middle-level target test question information with a matching degree with the original test question information being greater than a preset second matching degree corresponding to the target subject exists in the test question database, a piece of middle-level target test question information selected by the user from the at least one piece of middle-level target test question information as middle-level target test question information to be queried;

the acquiring unit is further configured to acquire answer information corresponding to the intermediate-level target test question information to be queried;

and the second output unit is also used for outputting answer information corresponding to the intermediate-level target test question information to be inquired.

A third aspect of the embodiments of the present invention discloses a mobile terminal, including:

a memory storing executable program code;

a processor coupled with the memory;

the processor calls the executable program code stored in the memory to execute the method for close-range imaging disclosed by the first aspect of the embodiment of the invention.

A fourth aspect of the embodiments of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the method for close-range imaging disclosed in the first aspect of the embodiments of the present invention.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, the mobile terminal can determine whether to start the black-and-white fixed-focus camera or not by judging whether the shot object is in the object distance range capable of clearly imaging, and if so, the black-and-white fixed-focus camera is started and shooting operation is executed. In an application scene of close-range shooting, the mobile terminal can present a clear shooting image in the shortest time through the quick focusing characteristic of the black-and-white fixed-focus camera, and the step of image binarization is omitted because the black-and-white fixed-focus camera shoots a black-and-white image; the mobile terminal also presents more image details through the characteristics of large photosensitive area and high pixel size of a black-and-white sensor in the black-and-white fixed-focus camera, so that the quality of a black-and-white image shot by the black-and-white fixed-focus camera is higher than that of a color image shot by the zoom camera, the shot image is convenient to convert into test question content, and the identification degree of the shot image is improved. In conclusion, by implementing the embodiment of the invention, the quality and efficiency of the short-distance imaging can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a method for close-up imaging according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart of another method for close-up imaging according to the embodiment of the present disclosure;

FIG. 3 is a schematic flow chart of another close-up imaging method according to the embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a mobile terminal disclosed in the embodiment of the present invention;

fig. 5 is a schematic structural diagram of another mobile terminal disclosed in the embodiment of the present invention;

fig. 6 is a schematic structural diagram of another mobile terminal disclosed in the embodiment of the present invention;

fig. 7 is a schematic structural diagram of another mobile terminal disclosed in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The embodiment of the invention discloses a close-range imaging method and a mobile terminal, which can improve the quality and efficiency of close-range imaging. The following are detailed below.

Example one

Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a close-range imaging method according to an embodiment of the present invention. As shown in fig. 1, the close-up imaging method may include the steps of:

101. the mobile terminal receives a starting instruction for starting a black and white fixed-focus camera in the mobile terminal.

In the embodiment of the present invention, the mobile terminal may receive an opening instruction for opening a black and white fixed-focus camera of the mobile terminal, which is input by a user, so as to trigger execution of step 102. The user input mode may be to click an identifier on a display screen of the mobile terminal, which is used to open the black-and-white fixed-focus camera of the mobile terminal, or to input a voice for opening the black-and-white fixed-focus camera of the mobile terminal, which is not limited in the embodiment of the present invention.

102. The mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range, if so, step 103 is executed, and if not, step 102 is executed.

In the embodiment of the present invention, after receiving the opening instruction for opening the black-and-white fixed focus camera in the mobile terminal in step 101, the mobile terminal may detect whether the distance between the object to be photographed in the lens and the black-and-white fixed focus camera on the mobile terminal is within the range of the clear imaging object distance, if the distance is within the range of the clear imaging object distance, the image can be clearly imaged within a preset depth of field range (for example, 15cm to 25cm), and if the mobile terminal detects that the distance between the object to be photographed and the black-and-white fixed focus camera is not within the preset range of the clear imaging object distance, step 102 is still executed. The depth of field (DOF) is a range of distances between the front and rear of the subject measured in imaging in which a sharp image can be obtained at the front edge of a camera lens or other imager. In other words, there is a space with a certain length in front of the lens (in front of and behind the focus), and when the object is located in the space, the image of the object on the negative film is located between the two circles of confusion in front of and behind the focus. The length of the space in which the object is located is called the depth of field. Therefore, the step 102 can be executed by detecting whether the distance between the shot object and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, so that the situation that the black-and-white fixed-focus camera is turned on when the distance between the shot object and the black-and-white fixed-focus camera is out of the preset clear imaging object distance range is avoided, and the power consumption of the mobile terminal is reduced.

103. And the mobile terminal starts the black and white fixed-focus camera and controls the black and white fixed-focus camera to automatically focus.

In the embodiment of the present invention, when the mobile terminal detects that the distance between the object to be photographed and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, the mobile terminal may open the black-and-white fixed-focus camera to trigger execution of step 104, and the black-and-white camera has a function of automatically identifying the position of the object to be photographed and an automatic focusing function. Therefore, step 103 can be executed by turning on the black-and-white fixed-focus camera and controlling the black-and-white fixed-focus camera to automatically focus, so that the focusing time is reduced, and the shooting efficiency is improved.

104. The mobile terminal receives a photographing instruction input by a user and performs a photographing operation to obtain a photographed image.

In the embodiment of the present invention, after controlling the black-and-white fixed-focus camera to automatically focus in step 103, the mobile terminal may receive a shooting instruction input by a user, where the mode of inputting the shooting instruction by the user may be to click an identifier for shooting on a display screen of the mobile terminal, or to input a voice for shooting. The mobile terminal can also execute shooting operation according to the shooting instruction and acquire a shot image shot by the black-and-white fixed-focus camera. Therefore, step 104 is executed to enable the black-and-white fixed-focus camera to capture the obtained captured image, and due to the characteristics of the black-and-white sensor in the black-and-white fixed-focus camera, the image quality of the captured image is improved.

Therefore, by implementing the method described in fig. 1, the mobile terminal can detect whether the distance between the shot object and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, thereby avoiding the situation that the black-and-white fixed-focus camera is turned on when the distance between the shot object and the black-and-white fixed-focus camera is outside the preset clear imaging object distance range, and reducing the power consumption of the mobile terminal; the mobile terminal can also reduce focusing time by opening the black and white fixed-focus camera and controlling the black and white fixed-focus camera to automatically focus, so that the shooting efficiency is improved; the mobile terminal can also shoot the obtained shot image through the black-and-white fixed-focus camera, and due to the characteristics of large photosensitive area and high pixel size of the black-and-white sensor in the black-and-white fixed-focus camera, the image quality of the shot image is improved. Therefore, in summary, it can be concluded that the method of close-range imaging described in fig. 1 can improve the quality and efficiency of close-range imaging.

Example two

Referring to fig. 2, fig. 2 is a schematic flowchart illustrating another close-range imaging method according to an embodiment of the present invention. As shown in fig. 2, the close-up imaging method may include the steps of:

201. the mobile terminal receives a starting instruction for starting a black and white fixed-focus camera in the mobile terminal.

In the embodiment of the present invention, after receiving a start instruction for starting a black and white fixed-focus camera in the mobile terminal, the mobile terminal triggers and executes step 202.

202. The mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range, if so, step 208 is executed, and if not, step 203 is executed.

203. The mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum distance between the clear imaging object, if so, step 204 is executed, and if not, step 205 is executed.

In the embodiment of the invention, when the mobile terminal detects that the distance between the shot object and the black-and-white fixed-focus camera is not within the preset clear imaging object distance range, whether the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum clear imaging object distance is further detected, and different prompt information is output according to the distance between the shot object and the black-and-white fixed-focus camera.

204. The mobile terminal outputs first prompt information, and the first prompt information is used for prompting a user to control the black-and-white fixed-focus camera to be far away from a shot object.

In the embodiment of the invention, when the mobile terminal detects that the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum distance of the clear imaging object, the mobile terminal can output first prompt information for prompting a user to control the black-and-white fixed-focus camera to be far away from the shot object, and the user needs to be prompted to control the black-and-white fixed-focus camera to be far away from the shot object because the shot object and the black-and-white fixed-focus camera are too close to each other to enable clear imaging to be realized. Therefore, the step 204 can be executed to further improve the user experience by outputting the first prompt message for prompting the user to control the black-and-white fixed-focus camera to be away from the object.

205. And the mobile terminal outputs second prompt information, and the second prompt information is used for prompting whether the user needs to switch the black-and-white fixed-focus camera into the zoom camera.

In the embodiment of the invention, when the mobile terminal does not detect that the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum distance of the clear imaging object, the mobile terminal can output second prompt information for prompting the user whether to switch the black-and-white fixed-focus camera to the zoom camera, and because the distance between the shot object and the black-and-white fixed-focus camera is too far to clearly image, the user needs to be prompted whether to switch the black-and-white fixed-focus camera to the zoom camera beneficial to medium-distance and long-distance shooting. Moreover, the user can obtain a desired color image by switching the zoom camera based on the color requirement of some photos.

In the embodiment of the present invention, the mobile terminal may improve user experience by outputting the prompt information in the human-computer interaction manner, and the mobile terminal may be used to photograph a subject and also may be used to photograph a color scene.

206. And if the mobile terminal detects the operation input by the user and used for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal starts the zoom camera.

In the embodiment of the present invention, after the second prompt information for prompting whether the user needs to switch the black-and-white fixed-focus camera to the zoom camera is output in step 205, if the mobile terminal detects an operation, which is input by the user, for switching the black-and-white fixed-focus camera to the zoom camera, the zoom camera is turned on; if the mobile terminal does not detect the operation input by the user for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal outputs prompt information for prompting the user to control the black and white fixed-focus camera to approach the shot object. Therefore, the step 206 can be executed to improve the imaging quality of the mobile terminal when the shot object is at different distances by turning on the zoom camera after detecting the operation of the user input for switching the black and white fixed focus camera to the zoom camera.

207. And the mobile terminal starts the black and white fixed-focus camera and controls the black and white fixed-focus camera to automatically focus.

208. The mobile terminal receives a photographing instruction input by a user and performs a photographing operation to obtain a photographed image.

Therefore, by implementing the method described in fig. 2, the mobile terminal can detect whether the distance between the shot object and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, thereby avoiding the situation that the black-and-white fixed-focus camera is turned on when the distance between the shot object and the black-and-white fixed-focus camera is outside the preset clear imaging object distance range, and reducing the power consumption of the mobile terminal; the mobile terminal can further improve the user experience by outputting first prompt information for prompting the user to control the black-and-white fixed-focus camera to be far away from the shot object; the mobile terminal can also start the zoom camera after detecting the operation input by the user and used for switching the black and white fixed focus camera to the zoom camera, so that the imaging quality of the mobile terminal when the shot object is at different distances is improved; the mobile terminal can also reduce focusing time by opening the black and white fixed-focus camera and controlling the black and white fixed-focus camera to automatically focus, so that the shooting efficiency is improved; the mobile terminal can also shoot the obtained shot image through the black-and-white fixed-focus camera, and due to the characteristics of large photosensitive area and high pixel size of the black-and-white sensor in the black-and-white fixed-focus camera, the image quality of the shot image is improved. Therefore, in summary, it can be concluded that the method of close-range imaging described in fig. 2 can further improve the quality and efficiency of close-range imaging.

EXAMPLE III

Referring to fig. 3, fig. 3 is a schematic flowchart illustrating another close-range imaging method according to an embodiment of the present invention. As shown in fig. 3, the captured image is a subject image, and the close-range imaging method may include the following steps:

301. the mobile terminal receives a starting instruction for starting a black and white fixed-focus camera in the mobile terminal.

In the embodiment of the present invention, after the step 301 is completed, the step 302 is triggered to be executed.

302. The mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is within a preset clear imaging object distance range, if so, step 307 is executed, and if not, step 303 is executed.

303. The mobile terminal detects whether the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum distance between the clear imaging object, if so, the step 304 is executed, and if not, the step 305 is executed.

304. The mobile terminal outputs first prompt information, and the first prompt information is used for prompting a user to control the black-and-white fixed-focus camera to be far away from a shot object.

305. And the mobile terminal outputs second prompt information, and the second prompt information is used for prompting whether the user needs to switch the black-and-white fixed-focus camera into the zoom camera.

306. And if the mobile terminal detects the operation input by the user and used for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal starts the zoom camera.

In the embodiment of the present invention, after outputting the second prompt information for prompting the user whether to switch the black-and-white fixed-focus camera to the zoom camera in step 305, if the mobile terminal detects an operation input by the user to switch the black-and-white fixed-focus camera to the zoom camera, the zoom camera is turned on; if the mobile terminal does not detect the operation input by the user for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal outputs prompt information for prompting the user to control the black and white fixed-focus camera to approach the shot object.

307. And the mobile terminal starts the black and white fixed-focus camera and controls the black and white fixed-focus camera to automatically focus.

308. The mobile terminal receives a photographing instruction input by a user and performs a photographing operation to obtain a photographed image.

309. The mobile terminal extracts original test question information from the photographed image.

In the embodiment of the present invention, after the captured image is obtained in step 308, the mobile terminal may extract original test question information from the captured image, where the original test question information may be text information or graph information, and the mobile terminal may extract an edge of the captured image through a sobel edge algorithm, and then perform graying, binarization and smooth filtering on the image, so as to connect text information together through morphological erosion, expansion, open operation and close operation, and then obtain a candidate text block region by using a connected domain marker and screen and extract a text block according to a preset rule; after the text blocks are extracted, the mobile terminal needs to segment the text blocks from the background with complex shot images, an adaptive threshold value can be obtained by using an OSTU algorithm, then a clean and clear binary image can be obtained, and finally, the original test question information can be integrated and extracted by segmenting the characters in the text blocks by using single characters. The OSTU algorithm (tsu algorithm) is an efficient algorithm for binarizing an image. The sobel edge algorithm comprises an operator for detecting a horizontal edge and an operator for detecting a vertical edge, and the influence of the sobel operator on the pixel position is weighted, so that the edge blurring degree can be reduced. Since the sobel operator is in the form of a filter operator for extracting edges, a fast convolution function can be utilized and is simple and efficient. Therefore, the step 309 can extract the original test question information from the shot image through the sobel edge algorithm and the OSTU algorithm (tsu algorithm), thereby improving the information extraction efficiency.

310. The mobile terminal detects whether at least one piece of high-level target test question information with the matching degree with the original test question information larger than a preset first matching degree exists in the test question database, if so, the step 311 is executed, and if not, the step 312 is executed.

In the embodiment of the present invention, after extracting the original test question information from the captured image in step 309, the mobile terminal may detect whether at least one high-level target test question information whose matching degree with the original test question information is greater than a preset first matching degree exists in the test question database. For example, if the preset first matching degree is 90%, if there is at least one piece of high-level target test question information, the similarity between the high-level target test question information and the original test question information is greater than 90%. The test question database may be a local test question database or a cloud test question database, and the embodiment of the present invention is not limited. Therefore, the step 310 may be executed by detecting whether at least one high-level target test question information with a matching degree with the original test question information greater than a preset first matching degree exists in the test question database, that is, after the condition screening is performed, a limited number of high-level target test question information is output, so as to reduce the power consumption of the mobile terminal.

311. The mobile terminal determines a piece of high-level target test question information selected from at least one piece of high-level target test question information by a user as the high-level target test question information to be inquired, acquires answer information corresponding to the high-level target test question information to be inquired, and outputs the answer information corresponding to the high-level target test question information to be inquired.

In the embodiment of the invention, after the mobile terminal detects that at least one piece of high-level target test question information with the matching degree with the original test question information larger than the preset first matching degree exists in the test question database, the mobile terminal can determine a piece of high-level target test question information selected from the at least one piece of high-level target test question information by a user as the high-level target test question information to be inquired, search answer information corresponding to the high-level target test question information to be inquired in the test question database and output the answer information corresponding to the high-level target test question information to be inquired.

In the embodiment of the invention, the answer information can be a problem solving process aiming at the high-grade target test question information to be inquired, the problem solving process can be text information or voice information, and the embodiment of the invention is not limited; the answer information may also be in an output form such as video or audio or Gif image for the advanced target test question information to be queried, and the embodiment of the present invention is not limited thereto, wherein the mobile terminal may selectively output the answer information according to the setting of the user (for example, only output the video and the question solving process).

312. And the mobile terminal identifies the target subject to which the original test question information belongs.

In the embodiment of the invention, when the mobile terminal detects that at least one piece of high-level target test question information with the matching degree with the original test question information larger than the preset first matching degree does not exist in the test question database, the mobile terminal can firstly identify the academic expressions in the original test question information and determine the target subject to which the original test question information belongs according to the academic expressions stored in the database and the subject matched with the academic expressions. Therefore, the step 312 can be executed to distinguish the matching degree with the original test question information according to the difficulty degree of the subject by identifying the target subject to which the original test question information belongs, thereby improving the user experience to a certain extent.

313. The mobile terminal detects whether at least one piece of middle-level target test question information with the matching degree with the original test question information larger than a preset second matching degree corresponding to the target subject exists in the test question database, the preset second matching degree is smaller than the preset first matching degree, if yes, step 314 is executed, and if not, the process is ended.

In the embodiment of the present invention, after the target subject to which the original test question information belongs is identified in step 312, the mobile terminal may detect whether at least one piece of middle-level target test question information whose matching degree with the original test question information is greater than a preset second matching degree corresponding to the target subject exists in the test question database, where different subjects correspond to different preset second matching degrees, and the preset second matching degree is less than the preset first matching degree. For example, if the target subject is physical, the corresponding preset second matching degree may be 70%; if the target subject is a Chinese language, the corresponding predetermined second matching degree may be 80%. Therefore, the step 313 is executed to further reduce the power consumption of the mobile terminal by detecting whether at least one piece of intermediate-level target test question information with the matching degree with the original test question information being greater than the preset second matching degree corresponding to the target subject exists in the test question database.

314. The mobile terminal determines a piece of middle-level target test question information selected from at least one piece of middle-level target test question information by a user as the middle-level target test question information to be inquired, acquires answer information corresponding to the middle-level target test question information to be inquired, and outputs the answer information corresponding to the middle-level target test question information to be inquired.

Therefore, in the optional embodiment, the mobile terminal can detect whether the distance between the shot object and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, so that the situation that the black-and-white fixed-focus camera is opened when the distance between the shot object and the black-and-white fixed-focus camera is beyond the preset clear imaging object distance range is avoided, and the power consumption of the mobile terminal is reduced; the mobile terminal can further improve the user experience by outputting first prompt information for prompting the user to control the black-and-white fixed-focus camera to be far away from the shot object; the mobile terminal can also start the zoom camera after detecting the operation input by the user and used for switching the black and white fixed focus camera to the zoom camera, so that the imaging quality of the mobile terminal when the shot object is at different distances is improved; the mobile terminal can also reduce focusing time by opening the black and white fixed-focus camera and controlling the black and white fixed-focus camera to automatically focus, so that the shooting efficiency is improved; the mobile terminal can also shoot a shot image through the black-and-white fixed-focus camera, and due to the characteristics of large photosensitive area and high pixel size of a black-and-white sensor in the black-and-white fixed-focus camera, the image quality of the shot image is improved; the mobile terminal can also extract original test question information from the shot image through a sobel edge algorithm and an OSTU algorithm (Otsu algorithm), so that the information extraction efficiency is improved; the mobile terminal can also output a limited number of high-level target test question information by detecting whether at least one piece of high-level target test question information with the matching degree with the original test question information larger than the preset first matching degree exists in the test question database, namely after condition screening, the power consumption of the mobile terminal is reduced; the mobile terminal can also distinguish the matching degree of the original test question information according to the difficulty degree of the subject by identifying the target subject to which the original test question information belongs, so that the user experience is improved to a certain extent; the mobile terminal can further reduce the power consumption of the mobile terminal by detecting whether at least one piece of middle-level target test question information with the matching degree with the original test question information larger than the preset second matching degree corresponding to the target subject exists in the test question database. Therefore, it can be concluded from the above that the method of close-range imaging described in fig. 3 can be implemented to further improve the quality and efficiency of close-range imaging.

Example four

Referring to fig. 4, fig. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. As shown in fig. 4, the mobile terminal may include:

the receiving unit 401 is configured to receive a start instruction for starting a black and white fixed-focus camera in the mobile terminal.

In the embodiment of the present invention, after the receiving unit 401 receives a start instruction for starting a black and white fixed-focus camera in the mobile terminal, the first detecting unit 402 is triggered to execute a detecting operation.

The first detecting unit 402 is configured to detect whether a distance between the object to be photographed and the black-and-white fixed-focus camera is within a preset clear imaging object distance range.

And a starting unit 403, configured to start the black-white fixed focus camera and control the black-white fixed focus camera to perform auto focusing after the first detecting unit 402 detects that the distance between the object to be photographed and the black-white fixed focus camera is within the preset clear imaging object distance range.

In the embodiment of the present invention, after the start unit 403 starts the black-and-white fixed-focus camera and controls the black-and-white fixed-focus camera to perform auto-focus, the receiving unit 401 is triggered to execute the receiving operation.

The receiving unit 401 is further configured to receive a shooting instruction input by a user and perform a shooting operation to obtain a shot image.

As can be seen, with the mobile terminal described in fig. 4, the first detecting unit 402 can detect whether the distance between the object to be photographed and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, so as to avoid the situation that the black-and-white fixed-focus camera is turned on when the distance between the object to be photographed and the black-and-white fixed-focus camera is outside the preset clear imaging object distance range, thereby reducing the power consumption of the mobile terminal; the opening unit 403 can reduce focusing time by opening the black-and-white fixed-focus camera and controlling the black-and-white fixed-focus camera to automatically focus, thereby improving shooting efficiency; the receiving unit 401 can capture the captured image by the black-and-white fixed-focus camera, and due to the characteristics of the black-and-white sensor in the black-and-white fixed-focus camera, such as large photosensitive area and high pixel size, the image quality of the captured image is improved. Therefore, it can be concluded from the above that the mobile terminal described in fig. 4 can improve the quality and efficiency of close-range imaging.

EXAMPLE five

Referring to fig. 5, fig. 5 is a schematic structural diagram of another mobile terminal according to an embodiment of the present invention. The mobile terminal shown in fig. 5 is optimized by the mobile terminal shown in fig. 4. Compared to the mobile terminal shown in fig. 4, the mobile terminal shown in fig. 5 may further include:

the first detecting unit 402 is further configured to detect whether the distance between the object and the black-and-white fixed-focus camera is smaller than the minimum value of the distance between the object and the black-and-white fixed-focus camera when the distance between the object and the black-and-white fixed-focus camera is not within the range of the distance between the object and the clear imaging object.

And a first output unit 404, configured to output first prompt information when the first detection unit 402 detects that the distance between the object to be shot and the black-and-white fixed-focus camera is smaller than the minimum distance between the clear imaging object, where the first prompt information is used to prompt a user to control the black-and-white fixed-focus camera to be away from the object to be shot.

The first output unit 404 is further configured to output second prompt information when the first detection unit 402 detects that the distance between the object to be shot and the black-and-white fixed-focus camera is greater than the maximum distance of the clear imaging object, where the second prompt information is used to prompt a user whether the black-and-white fixed-focus camera needs to be switched to a zoom camera.

And the turning-on unit 403 is further configured to turn on the zoom camera when the mobile terminal detects an operation for switching the black and white fixed-focus camera to the zoom camera, which is input by the user.

As can be seen, with the mobile terminal described in fig. 5, the first detecting unit 402 can detect whether the distance between the object to be photographed and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, so as to avoid the situation that the black-and-white fixed-focus camera is turned on when the distance between the object to be photographed and the black-and-white fixed-focus camera is outside the preset clear imaging object distance range, thereby reducing the power consumption of the mobile terminal; the first output unit 404 can further improve user experience by outputting first prompt information for prompting a user to control the black-and-white fixed-focus camera to be away from the shot object; the opening unit 403 can improve the imaging quality of the mobile terminal when the shot object is at different distances by opening the zoom camera after detecting the operation input by the user to switch the black and white fixed focus camera to the zoom camera; the opening unit 403 can reduce focusing time by opening the black-and-white fixed-focus camera and controlling the black-and-white fixed-focus camera to automatically focus, thereby improving shooting efficiency; the receiving unit 401 can capture the captured image by the black-and-white fixed-focus camera, and due to the characteristics of the black-and-white sensor in the black-and-white fixed-focus camera, such as large photosensitive area and high pixel size, the image quality of the captured image is improved. Therefore, it can be concluded from the above that the mobile terminal described in fig. 5 can further improve the quality and efficiency of the short-distance imaging.

EXAMPLE six

Referring to fig. 6, fig. 6 is a schematic structural diagram of another mobile terminal according to an embodiment of the present invention. The mobile terminal shown in fig. 6 is optimized by the mobile terminal shown in fig. 5. Compared with the mobile terminal shown in fig. 5, the captured image is a topic image, and the mobile terminal shown in fig. 6 may further include:

an extracting unit 405 for extracting the original question information from the photographed image after the photographed image is obtained by the receiving unit 401.

The second detecting unit 406 is configured to detect whether at least one high-level target test question information whose matching degree with the original test question information is greater than a preset first matching degree exists in the test question database.

The determining unit 407 is configured to determine, after the second detecting unit 406 detects that at least one high-level target test question information with a matching degree with the original test question information being greater than a preset first matching degree exists in the test question database, a certain high-level target test question information selected by the user from the at least one high-level target test question information as the high-level target test question information to be queried.

The obtaining unit 408 is configured to obtain answer information corresponding to the high-level target test question information to be queried.

And the second output unit 409 is configured to output answer information corresponding to the high-level target test question information to be queried.

The identifying unit 410 is configured to identify a target subject to which the original test question information belongs after the second detecting unit 406 detects that at least one high-level target test question information with a matching degree with the original test question information being greater than a preset first matching degree does not exist in the test question database.

The second detecting unit 406 is further configured to detect whether at least one piece of middle-level target test question information whose matching degree with the original test question information is greater than a preset second matching degree corresponding to the target subject exists in the test question database, where the preset second matching degree is smaller than the preset first matching degree.

The determining unit 407 is further configured to determine, after the second detecting unit 408 detects that at least one piece of middle-level target test question information with a matching degree with the original test question information being greater than a preset second matching degree corresponding to the target subject exists in the test question database, a piece of middle-level target test question information selected by the user from the at least one piece of middle-level target test question information is determined as the middle-level target test question information to be queried.

The obtaining unit 408 is further configured to obtain answer information corresponding to the intermediate-level target test question information to be queried.

The second output unit 409 is further configured to output answer information corresponding to the intermediate-level target test question information to be queried.

As can be seen, with the mobile terminal described in fig. 6, the first detecting unit 402 can detect whether the distance between the object to be photographed and the black-and-white fixed-focus camera is within the preset clear imaging object distance range, so as to avoid the situation that the black-and-white fixed-focus camera is turned on when the distance between the object to be photographed and the black-and-white fixed-focus camera is outside the preset clear imaging object distance range, thereby reducing the power consumption of the mobile terminal; the first output unit 404 can further improve user experience by outputting first prompt information for prompting a user to control the black-and-white fixed-focus camera to be away from the shot object; the opening unit 403 can improve the imaging quality of the mobile terminal when the shot object is at different distances by opening the zoom camera after detecting the operation input by the user to switch the black and white fixed focus camera to the zoom camera; the opening unit 403 can reduce focusing time by opening the black-and-white fixed-focus camera and controlling the black-and-white fixed-focus camera to automatically focus, thereby improving shooting efficiency; the receiving unit 401 can obtain a captured image captured by the black-and-white fixed-focus camera, and due to the characteristics of large photosensitive area and high pixel size of the black-and-white sensor in the black-and-white fixed-focus camera, the image quality of the captured image is improved; the extraction unit 405 can extract original test question information from the shot image through a sobel edge algorithm and an OSTU algorithm (Otsu algorithm), so that the information extraction efficiency is improved; the second detection unit 406 can detect whether at least one piece of high-level target test question information with the matching degree with the original test question information larger than the preset first matching degree exists in the test question database, namely, after condition screening, a limited number of pieces of high-level target test question information are output, so that the power consumption of the mobile terminal is reduced; the identifying unit 410 can distinguish the matching degree with the original test question information according to the difficulty degree of the subject by identifying the target subject to which the original test question information belongs, so that the user experience is improved to a certain extent; the second detecting unit 406 can further reduce the power consumption of the mobile terminal by detecting whether at least one piece of middle-level target test question information with the matching degree with the original test question information being greater than the preset second matching degree corresponding to the target subject exists in the test question database. Therefore, it can be concluded from the above that the mobile terminal described in fig. 6 can further improve the quality and efficiency of the short-distance imaging.

EXAMPLE seven

Referring to fig. 7, fig. 7 is a schematic structural diagram of another mobile terminal according to an embodiment of the present invention. As shown in fig. 7, the mobile terminal may include:

a memory 701 in which executable program code is stored;

a processor 702 coupled to the memory 701;

the processor 702 calls the executable program code stored in the memory 701 to execute any one of the close-range imaging methods in fig. 1 to 3.

The embodiment of the invention discloses a computer-readable storage medium which stores a computer program, wherein the computer program enables a computer to execute any one close-range imaging method in figures 1-3.

It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.

The method for short-range imaging and the mobile terminal disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method of close-up imaging, the method comprising:

if the mobile terminal detects the operation input by a user and used for switching the black and white fixed-focus camera to the zoom camera, the mobile terminal starts the zoom camera;

the mobile terminal receives a shooting instruction input by a user and executes shooting operation to obtain a shot image, and the mobile terminal is used for shooting a question or shooting a color scene.

2. The method of claim 1, further comprising:

3. The method according to claim 1, wherein the captured image is a topic image, and after the mobile terminal obtains the captured image, the method further comprises:

4. The method according to claim 3, wherein after the mobile terminal detects that there is no high-level target test question information in the test question database, the matching degree of which with the original test question information is greater than a preset first matching degree, the method further comprises:

5. A mobile terminal, characterized in that the mobile terminal comprises:

the first output unit is used for outputting second prompt information when the first detection unit detects that the distance between the shot object and the black and white fixed-focus camera is larger than the maximum distance of the clear imaging object, and the second prompt information is used for prompting a user whether the black and white fixed-focus camera needs to be switched to a zoom camera or not;

the starting unit is further configured to start the zoom camera by the mobile terminal when the mobile terminal detects an operation input by a user and used for switching the black-and-white fixed-focus camera to the zoom camera;

the receiving unit is also used for receiving a shooting instruction input by a user and executing shooting operation to obtain a shot image;

the mobile terminal is used for shooting questions or color scenes.

6. The mobile terminal of claim 5, wherein the mobile terminal further comprises:

the first output unit is further used for outputting first prompt information when the first detection unit detects that the distance between the shot object and the black-and-white fixed-focus camera is smaller than the minimum distance of the clear imaging object, wherein the first prompt information is used for prompting a user to control the black-and-white fixed-focus camera to be far away from the shot object.

7. The mobile terminal according to claim 5, wherein the captured image is a topic image, the mobile terminal further comprising:

8. The mobile terminal of claim 7, wherein the mobile terminal further comprises: