WO2013075472A1

WO2013075472A1 - Screen unlocking method and device

Info

Publication number: WO2013075472A1
Application number: PCT/CN2012/076022
Authority: WO
Inventors: 张楠
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-21
Filing date: 2012-05-24
Publication date: 2013-05-30
Also published as: CN102508614B; CN102508614A

Abstract

Disclosed are a screen unlocking method and device. The screen unlocking method includes: a terminal acquiring an indentation graph formed by an input medium pressing an image collection interface of a touch screen thereof; the terminal extracting a corresponding point set of the indentation graph, and comparing the similarity between the corresponding point set of the indentation graph and a preset point set; and when the similarity thereof is higher than or equal to a preset similarity threshold value, unlocking the screen of the terminal. The screen unlocking method solves the problem in the related art that the setting of the screen locking function of a mobile terminal is too simple and there is a serious security risk, so that a user can unlock a terminal in a more secure manner, and the terminal has a higher security coefficient, improving user experience.

Description

The present invention relates to the field of communications, and in particular to a method and apparatus for unlocking a screen. BACKGROUND OF THE INVENTION With the development of the times, various terminals also play an important role. For example, mobile terminals have become an indispensable part of people's lives, and there are mobile terminals wherever they are. The functions of mobile terminals are also growing stronger. At present, mobile terminals on the market all have a lock screen function, and the application of the lock screen function brings a lot of convenience to the user's life. When the mobile terminal is in an idle or unused state, the user can lock the mobile terminal, which can save power consumption, increase the standby time of the mobile terminal, and prevent the user from negligently moving when the mobile terminal is in an idle or unused state. The terminal performed an erroneous operation that should not be performed. For some users, the mobile terminal has become a tool for storing private information. The use of the lock function of the mobile terminal is not only for saving power consumption and preventing misoperation, but also for the security of the mobile phone. The existing mobile terminal can set a password when the mobile phone locks the screen. When the user wants to unlock, the user must use the corresponding password to unlock the screen of the mobile terminal in the lock screen state. The lock screen function of the existing touch screen mobile terminal can lock and unlock the screen by inputting a password and sliding the unlocking slider, but when the password is stolen by others and/or the mobile terminal falls into the hands of others, the lock screen of the mobile terminal The function setting is simple and there is a great security risk. Aiming at the problem that the lock screen function of the terminal in the related art is simple and has a great potential safety hazard, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for unlocking a screen, so as to at least solve the problem that the lock screen function of the terminal in the related art is simple, resulting in a great security risk. According to an aspect of the present invention, a method for unlocking a screen is provided, including: acquiring, by a terminal, an indentation pattern formed by pressing an input medium on an image collection interface of a touch screen; and extracting, by the terminal, a corresponding point set of the indentation graphic, comparing the indentation The similarity between the corresponding point set of the graphic and the preset point set; when the similarity degree is higher than or equal to the preset similarity threshold, the screen of the terminal is unlocked. Preferably, the indentation pattern comprises: a boundary continuous indentation pattern and/or a non-boundary continuous indentation pattern. Preferably, when the indentation pattern is a boundary continuous indentation pattern, the terminal extracts a corresponding point set of the indentation pattern, and comparing the similarity between the corresponding point set of the indentation pattern and the preset point set includes: extracting the boundary continuous indentation pattern The corresponding point set extracts the feature points in the corresponding point set; calculates the feature value of the feature point according to the preset feature value algorithm; compares the similarity between the feature value and the preset feature value. Preferably, the method for extracting feature points comprises: framing a continuous indentation pattern with a rectangle having a minimum boundary; halving the rectangle by a set of parallel lines; extracting features at an intersection of parallel lines and boundary of continuous indentation pattern boundaries point. Preferably, the preset eigenvalue algorithm comprises: a curve approximation parameter method and/or a curve fitting parameter method. Preferably, when the indentation pattern is a non-boundary continuous indentation pattern, the terminal extracts a corresponding point set of the indentation pattern, and comparing the similarity between the corresponding point set of the indentation pattern and the preset point set includes: extracting the non-boundary continuous indentation The corresponding point set of the graph; the translation/rotation vector of the corresponding point set of the non-boundary continuous indentation pattern relative to the preset point set, the translation/rotation transformation using the translation/rotation vector; the non-boundary after the translation/rotation transformation is compared The similarity between the corresponding point set of the continuous indentation pattern and the preset point set. Preferably, the terminal is a mobile terminal. According to another aspect of the present invention, an apparatus for unlocking a screen is provided, including: an acquisition module configured to acquire an indentation pattern formed by pressing an input medium on an image collection interface of a touch screen of the terminal; and a comparison module configured to extract an indentation graphic Corresponding point set, comparing the similarity between the corresponding point set of the indentation pattern and the preset point set; and the unlocking module is set to unlock the screen of the terminal when the similarity degree is higher than or equal to the preset similarity threshold value. Preferably, when the indentation pattern is a boundary continuous indentation pattern, the comparison module comprises: a first extraction sub-module, configured to extract a corresponding point set of the boundary continuous indentation pattern, and extract feature points in the corresponding point set; the first calculation sub- The module is configured to calculate a feature value of the feature point according to the preset feature value algorithm; the first comparison submodule is configured to compare the similarity between the feature value and the preset feature value. Preferably, when the indentation pattern is a non-boundary continuous indentation pattern, the extraction module further comprises: a second extraction sub-module, configured to extract a corresponding point set of the non-boundary continuous indentation pattern; and a second calculation sub-module, set to calculate the non- The corresponding point set of the boundary continuous indentation pattern is compared with the translation/rotation vector of the preset point set, and the translation/rotation transformation is performed using the translation/rotation vector; the second comparison sub-module is set to compare the non-boundary after the translation/rotation transformation The similarity between the corresponding point set of the continuous indentation pattern and the preset point set. Preferably, the terminal is a mobile terminal. According to the present invention, the corresponding point set of the indentation pattern formed by pressing the image input interface of the touch screen is extracted, and the similarity between the corresponding point set of the indentation pattern and the preset point set is compared, when the similarity degree is used. When the preset similarity threshold is higher than or equal to the preset similarity threshold, the method for unlocking the terminal screen solves the problem that the lock screen function of the mobile terminal in the related art is simple to set up, and there is a great potential safety hazard, so that the user is safer when using the terminal. The way to unlock, let the terminal have a higher safety factor and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a method for unlocking a screen according to an embodiment of the present invention; FIG. 2 is a flowchart of a method for unlocking a screen according to a preferred embodiment of the present invention; FIG. 3 is a preferred embodiment of the present invention. FIG. 4A is a schematic diagram 1 of a pattern acquisition according to a preferred embodiment 2 of the present invention; FIG. 4B is a schematic diagram 2 of a pattern acquisition according to a preferred embodiment 2 of the present invention; FIG. 4C is a schematic diagram of a pattern acquisition according to a preferred embodiment of the present invention; FIG. 5 is a schematic diagram of a seal pattern according to Embodiment 3 of the present invention; FIG. 6 is a block diagram of a screen unlocking apparatus according to an embodiment of the present invention; FIG. FIG. 8 is a structural block diagram of a screen unlocking apparatus according to an embodiment of the present invention; and FIG. 9 is a structural block diagram of a screen unlocking apparatus according to a preferred embodiment 4 of the present invention; . BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. An embodiment of the present invention provides a method for unlocking a screen. As shown in FIG. 1 , it is a flowchart of a method for unlocking a screen according to an embodiment of the present invention. The method for unlocking the screen includes: Step S102: The terminal acquires an indentation pattern formed by pressing an input medium on an image collection interface of the touch screen; in step S104, the terminal extracts a corresponding point set of the indentation graphic, and compares the corresponding point set of the indentation graphic. The similarity with the preset point set; Step S106: When the similarity degree is higher than or equal to the preset similarity threshold, the screen of the terminal is unlocked. In this embodiment, the corresponding point set of the indentation pattern formed by pressing the input medium on the image acquisition interface of the touch screen is extracted, and the similarity between the corresponding point set of the indentation pattern and the preset point set is compared, when the similarity is When the degree is higher than or equal to the preset similarity threshold, the method for unlocking the terminal screen solves the problem that the lock screen function of the mobile terminal in the related art is simple to set up, and there is a great potential safety hazard, so that the user compares when using the terminal. The secure way to unlock, so that the terminal has a higher safety factor, improve the user experience. Preferably, the indentation pattern may include: a boundary continuous indentation pattern and/or a non-boundary continuous indentation pattern. The boundary continuous indentation pattern may be a human fingerprint indentation or a boundary continuous pattern composed of a circular pattern; the non-boundary continuous pattern may be various patterns, and if applied to a fixed device terminal, the pattern may be an encryption of the device manufacturer. The seal, if applied to a mobile terminal, may be a seal that the user likes the pattern. The pattern is known only to the user. In other words, the seal of the pattern is only held by the user, which can improve the security performance of the terminal. When the indentation pattern is a boundary continuous indentation pattern, step S104 may further include the following processing:

(1) extracting corresponding set of points of the continuous indentation pattern of the boundary, and extracting feature points in the corresponding point set;

(2) Calculating the feature value of the feature point according to the preset feature value algorithm; (3) comparing the similarity between the feature value and the preset feature value. The above method of extracting feature points may include the following processing:

(1) framing a continuous indentation pattern with a rectangle with the smallest boundary;

(2) halve the rectangle in a set of parallel lines;

(3) Extracting feature points at the intersection of the parallel line and the boundary of the continuous indentation pattern of the boundary. In the implementation process, the method for extracting feature points may further include: framing the rectangle with the smallest boundary to the continuous indentation pattern of the boundary; dividing the rectangle by a set of horizontal parallel lines and vertical parallel lines; horizontal parallel lines and vertical Feature points are extracted at intersections of parallel lines. Preferably, the preset feature value algorithm may include: a curve approximation parameter method and/or a curve fitting parameter method. When the indentation pattern is a non-boundary continuous indentation pattern, step S104 may include the following processing:

(1) extracting a corresponding set of points of the non-boundary continuous indentation pattern;

(2) Calculate the translation/rotation vector of the corresponding point set of the non-boundary continuous indentation pattern relative to the preset point set, and use the translation/rotation vector to perform the translation/rotation transformation;

(3) Comparing the similarity between the corresponding point set of the non-boundary continuous indentation pattern after the translation/rotation transformation and the preset point set. In the implementation process, the indentation pattern can be input by the external seal pattern. Before the password can be set to the terminal, if the stamp is lost during use, the screen can be unlocked with the second password. After unlocking, the screen can be re-opened. Set a new stamp pattern for the new unlock pattern. Easy to use and high safety factor. Preferably, the terminal is a mobile terminal. The size of the mobile terminal is generally small. When the user's mobile terminal is lost, the method of safely unlocking the screen does not leak private information. Increased security. Preferred Embodiment 1 FIG. 2 is a flowchart of a method of unlocking a screen according to a preferred embodiment 1 of the present invention. As shown in FIG. 2, the method includes the following steps: Step S202: Display a graphic collection interface on a standby interface of the mobile terminal. The image acquisition interface can be located at the upper part, the middle part, the lower part of the touch screen, etc., and can be set arbitrarily, and can be in any area on the touch screen, and the area is only known by the user, and the safety factor is improved. Step S204: Collect a point set corresponding to the indentation pattern pressed by the authentication body on the touch screen. Step S206, extracting feature values corresponding to the point set. Step S208, determining whether the feature value matches the feature value preset by the terminal, and if it matches, unlocking is performed. With the above embodiment, the screen can be unlocked by comparing the feature value of the acquired image with the feature value of the preset image. Preferred Embodiment 2 FIG. 3 is a schematic flow chart of eigenvalue calculation according to a preferred embodiment 2 of the present invention. As shown in FIG. 3, this embodiment uses a finger pressure graphic to unlock. After obtaining the pixel point set M corresponding to the finger pressing pattern, the terminal needs to calculate the offset vector in order to eliminate the influence of the finger pressing position on the screen, and perform the translation/rotation transformation on the point set by using the offset vector to set the point. The set M is transformed into a new point set 变换' in the transformed coordinate system; several feature points are extracted in the point set M'; for the extracted feature points, the segmentation adopts curve approximation and/or curve fitting, which will approximate The curve parameters of the curve and/or the fitted curve are used as the characteristic values of the acupressure pattern. As shown in Fig. 4A-4C, the schematic diagram of the process of extracting the feature points of the acupressure pattern is introduced. The processing is as follows: Acupressure pattern acquisition. Through the touch screen module of the mobile terminal, an area where the user presses the finger in the collection area by the finger is obtained. As shown in FIG. 4A, FIG. 1 is a schematic diagram of a pattern acquisition according to a preferred embodiment 2 of the present invention. The acquisition area is a rectangular area, and is used to collect the coordinates of the force area points when the user presses a finger. After collection, a set of coordinates is formed. Calculate the offset vector. As shown in FIG. 4A, it is a schematic diagram 2 of the pattern acquisition according to the preferred embodiment 2 of the present invention. Calculate the minimum value X _min and the maximum value X _{max of the} abscissa of all points in the Μ, and the minimum value Ymm and the maximum value Ymax of all the ordinates of the point, then (Xmm, Ymm) (Xmm, Ymax) (X max, Ymin ) ( Xmax, Ymax ) The rectangle with the vertices constitutes the smallest rectangle, and (X _mm , Y _mm ) is the offset vector of the global coordinates, that is, the sampling coordinate system with the new origin (X _min , Y _mi „) as the new origin is re-established. The point in the M set is converted into the relative coordinate set M' by the offset vector (X _min , Y _min ). In this embodiment, the feature point extraction method in the fingerprint pressing unlocking embodiment is as shown in FIG. 4C , A schematic diagram 3 of a pattern acquisition according to a preferred embodiment 2 of the present invention. In the smallest rectangle, a quadrangle is parallel to the rectangular side of the Y-axis, and parallel lines are drawn at the equi-partitions, and the parallel lines intersect the boundary of the finger-pressure pattern at The 8 points of AH are used as the feature points of the acupressure pattern. In the implementation process, the acupressure pattern is unlocked by the curve approximation method, in which the eigenvalue calculation is performed by the second-order polynomial approximation method. AC, CE, EG, GA are segmented. Feature point, segmentation calculation, final shape Taking the three points of B, C as an example, calculate the polynomial coefficient corresponding to the quadratic polynomial approximation as the characteristic component Tl(al, bl, cl) of AC, where al, bl, and cl are respectively quadratic polynomials Coefficient of the phasing pattern in this way The values (Tl, T2, T3, Τ4) = (al, bl, cl, a2, b2, c2, a3, b3, c3, a4, b4, c4) are used as the eigenvalues corresponding to the acupressure area. In this embodiment, the comparison criterion of the similarity of the two eigenvalues may adopt the distance measurement method in the similarity measurement method of the vector. When the metric is within a certain threshold range, the metric of the acupressure pattern is considered to be the same. Otherwise, It is determined that the features are different. The method of feature point extraction may include: sampling feature points using parallel lines of n-divided rectangular boundaries; eigenvalue extraction may use curve approximation (eg, polynomial approximation, B-spline approximation, etc.) or curve fitting (eg, polynomial fitting) , polynomial function fitting, Bezier curve fitting, etc.), calculate the parameter set contained in the curve, merged into a vector as the eigenvalue of the acupressure graph; the eigenvalue similarity comparison criterion can also be calculated by the similarity function method. Preferred Embodiment 3 is a schematic view of a stamp pattern provided according to Embodiment 3 of the present invention, as shown in FIG. Due to the uncertainty of the shape of the seal, the figure does not necessarily have the boundary continuity of the finger pressure pattern, and the method of calculating the feature value by curve approximation and/or curve fitting cannot be used. In this embodiment, after obtaining the pixel point set M corresponding to the seal pattern, the terminal directly uses the M′ point set as the feature value (the unlocking of the seal graphic is compared with the unlocking of the finger pressing graphic in the second embodiment). For example, the process of feature point extraction and eigenvalue calculation is omitted, and the point set is directly used as a basis for judging whether the figure matches. The similarity calculation is performed according to the point set in M' and the point set stored in the terminal; if the similarity is within the threshold, the unlocking is successful. The method for calculating the similarity of two eigenvalues is as follows: When the metric value comparison is performed by the judging module, the entry condition is that the eigenvalue M1 introduced in the current standby interface and the eigenvalue M2 already stored in the terminal are obtained, and the calculation is required. The result is whether the two eigenvalues satisfy the similarity requirement. The calculation method is as follows: Step 1: Extract the points with the smallest and largest horizontal and vertical coordinates in the point sets M1 and M2 respectively, that is, extract the upper left, lower left, upper right, and lower right of the seal graphic. Four points. The point set M1 is denoted as Al, Bl, Cl, Dl; M2 is denoted as A2, B2, C2, D2; wherein, the points of the figure may be coincident, as shown in Fig. 5, the lower left and the lower right are one point. Step 2: Calculate the translation vector of the stamp graphic. Using the distance measure method, calculate the distance between the vectors A1A2, B1B2, C1C2, and D1D2, and find the mean of all the distance values, denoted as a. Step 3: When a is in the threshold range, (A1A2+B 1B2+C1C2+D1D2 ) /4 is taken as the translation vector of M1. Go to step 4; otherwise, return "similarity does not meet the requirements". Step 4: Translate the points in M1 according to the translation vector, and finally get a new point set. Step 5: Count the number of points belonging to Μ2 and belonging to ΜΓ, denoted as m, indicating the addition of points; count the number of points belonging to ΜΓ and not belonging to M2, denoted as n, indicating the sub-item; the statistics belong to M2 and The number of points not belonging to M2' is denoted by p, indicating the sub-item; Step 6: The calculated (mnp) I ( m+n+p ) is the similarity corresponding to the two point sets. When the similarity satisfies the requirement, the "similarity meets the requirement" is returned; otherwise, the "similarity does not meet the requirement" is returned. FIG. 6 is a structural block diagram of a screen unlocking apparatus according to an embodiment of the present invention. As shown in FIG. 6 , the screen unlocking device is applied to the terminal, and includes: an acquiring module 10 configured to acquire an indentation pattern formed by pressing an input medium on an image capturing interface of the touch screen of the terminal; and comparing the module 20, configured to extract the indentation graphic Corresponding point set, comparing the similarity between the corresponding point set of the indentation pattern and the preset point set; the unlocking module 30 is configured to unlock the screen of the terminal when the similarity degree is higher than or equal to the preset similarity threshold value . The acquisition module 10, the comparison module 20, and the unlocking module 30 are sequentially connected. As shown in FIG. 7 , when the indentation pattern is a boundary continuous indentation pattern, the comparison module 20 may include: a first extraction sub-module 202 configured to extract a corresponding point set of the boundary continuous indentation pattern, and extract features in the corresponding point set. The first calculation sub-module 204 is configured to calculate the feature value of the feature point according to the preset feature value algorithm; the first comparison sub-module 206 is configured to compare the similarity between the feature value and the preset feature value. As shown in FIG. 8, when the indentation pattern is a non-boundary continuous indentation pattern, the extraction module 20 may further include: a second extraction sub-module 208, configured to extract a corresponding point set of the non-boundary continuous indentation pattern; and a second calculation sub- The module 210 is configured to calculate a translation/rotation vector of the corresponding point set of the non-boundary continuous indentation pattern relative to the preset point set, and perform a translation/rotation transformation using the translation vector; the second comparison sub-module 212 is set to compare translation/ The similarity between the corresponding point set of the non-boundary continuous indentation pattern after the rotation transformation and the preset point set. Preferably, the terminal may be a mobile terminal. A preferred embodiment 4 is a block diagram of a screen unlocking apparatus according to a preferred embodiment 4 of the present invention, as shown in FIG. The screen unlocking device includes: a setting module 902, configured to set a screen lock on the mobile terminal; an obtaining module 904, configured to extract the indentation pattern; and a feature extraction module 906 configured to perform feature value extraction on the indentation graphic; The determining module 908 is configured to determine whether the feature value matches the terminal setting value; and the unlocking module 910 is configured to perform unlocking if the determination is consistent. The setting module of the terminal performs the indentation pattern feature extraction and stores it in the terminal; in the standby state, the user extracts the pixel point of the indentation pattern formed on the touch screen by the authentication body through the obtaining module 904 in the standby interface to form a point set. The feature extraction module 906 performs feature value calculation on the point set; the determination module performs feature value comparison, and if the matching is successful, the unlocking is performed normally. In this embodiment, by extracting the indentation pattern information, an unlocking method of the terminal is realized, and the security of the terminal is enhanced. The boundary of the figure formed after the actual authenticator presses the touch screen is not continuous as the boundary in the schematic diagram provided in the embodiment of the present invention, and the actual extraction has a certain zigzag shape, but the various algorithms proposed in the embodiments of the present invention are still Effectively from the above description, it can be seen that the present invention achieves the following technical effects: The embodiment of the present invention utilizes the inherent attribute feature of the indentation graphic, and is applied to a terminal supporting multi-touch, and performs lock screen authentication, and increases The security factor of the screen unlocking, the unlocking method is not easy to crack, and it has a good protection for the user's personal privacy. Improve the user experience. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method of unlocking a screen, comprising:

The terminal acquires an indentation pattern formed by the input medium pressing on the image collection interface of the touch screen; the terminal extracts a corresponding point set of the indentation pattern, and compares the corresponding point set of the indentation pattern with a preset point set. Degree

When the similarity degree is higher than or equal to the preset similarity threshold, the screen of the terminal is unlocked.

2. The method of claim 1, wherein the indentation pattern comprises: a boundary continuous indentation pattern and/or a non-boundary continuous indentation pattern.

3. The method according to claim 2, wherein, when the indentation pattern is the boundary continuous indentation pattern, the terminal extracts a corresponding point set of the indentation pattern, and compares the indentation pattern The similarity between the corresponding point set and the preset point set includes:

Extracting a corresponding point set of the boundary continuous indentation pattern, extracting a feature point in the corresponding point set; calculating a feature value of the feature point according to a preset feature value algorithm;

Comparing the similarity between the feature value and the preset feature value.

4. The method according to claim 3, wherein the method for extracting feature points comprises:

Frame the continuous indentation pattern of the boundary with a rectangle having the smallest boundary;

Dividing the rectangle into a set of parallel lines;

Feature points are extracted at the intersection of the parallel line and the boundary of the boundary continuous indentation pattern.

The method according to claim 4, wherein the preset feature value algorithm comprises: a curve approximation parameter method and/or a curve fitting parameter method.

6. The method according to claim 2, wherein, when the indentation pattern is the non-boundary continuous indentation pattern, the terminal extracts a corresponding point set of the indentation pattern, and compares the indentation pattern The similarity between the corresponding point set and the preset point set includes:

Extracting a corresponding set of points of the non-boundary continuous indentation pattern;

Calculating a translation/rotation vector of the corresponding point set of the non-boundary continuous indentation pattern with respect to the preset point set, and performing translation/rotation transformation using the translation/rotation vector; Comparing the similarity between the corresponding point set of the non-boundary continuous indentation pattern after the translation/rotation transformation and the preset point set.

The method according to any one of claims 1 to 6, wherein the terminal is a mobile terminal.

8. A device for unlocking a screen, applied to a terminal, comprising:

The obtaining module is configured to obtain an indentation pattern formed by pressing the input medium on the image capturing interface of the touch screen of the terminal;

a comparison module, configured to extract a corresponding point set of the indentation pattern, and compare a similarity between the corresponding point set of the indentation pattern and a preset point set;

The unlocking module is configured to unlock the screen of the terminal when the similarity degree is higher than or equal to the preset similarity threshold.

9. The apparatus according to claim 8, wherein, in the case where the indentation pattern is a boundary continuous indentation pattern, the comparison module comprises:

a first extraction sub-module, configured to extract a corresponding set of points of the boundary continuous indentation pattern, and extract feature points in the corresponding point set;

The first calculation sub-module is configured to calculate a feature value of the feature point according to a preset feature value algorithm; and the first comparison sub-module is configured to compare the similarity between the feature value and the preset feature value.

10. The device according to claim 8, wherein, in the case that the indentation pattern is a non-boundary continuous indentation pattern, the extraction module further comprises:

a second extraction sub-module, configured to extract a corresponding point set of the non-boundary continuous indentation pattern; a second calculation sub-module configured to calculate a corresponding point set of the non-boundary continuous indentation pattern relative to the preset a translation/rotation vector of the point set, using the translation/rotation vector for translation/rotation transformation; a second comparison sub-module, configured to compare the corresponding point set of the non-boundary continuous indentation pattern after the translation/rotation transformation The similarity of the preset point set.

The device according to any one of claims 8 to 10, wherein the terminal is a mobile terminal.