CN105739877A - Distance sensor based zoom method and system - Google Patents

Abstract

The invention provides a distance sensor based zoom mode for a mobile device. A distance c from the mobile device to the eyes of a user is obtained in real time, and the mobile device determines a zoom ratio according to the distance c to zoom out a display object. The zoom mode comprises the following steps of S1, obtaining data of an accelerometer and a gyroscope of a distance sensor in real time; and S2, according to the data obtained in the step S1, obtaining the distance c by adopting a quaternion method. When the mobile device is taken far away from the eyes of the user, the display object such as a picture and the like is automatically zoomed in; and when the mobile device is close to the eyes of the user, the display object is automaically zoomed out. The usage mode meets the ergonomics design, the user experience can be improved, and especially the large-sized mobile device is more convenient and comfortable to use.

Description

Zooming method and system based on distance sensor

Technical Field

The present invention relates to a scaling method and system, and more particularly, to a scaling method and system based on a distance reactor.

Background

Manual zooming is widely used in mobile devices for browsing pictures and taking photos. Generally, pressing the screen with two fingers simultaneously and pulling to both sides can zoom in, and moving closer together can zoom out. Holding the device in one hand and touching the screen with two fingers on the other hand is a current simple and popular implementation. This approach requires both fingers of one hand holding the device and the other hand to operate simultaneously to achieve zooming, but becomes increasingly difficult as the size of the handset and the panel become larger. Such as a 12-inch or larger screen, it is not convenient to use the current two-finger touch method for zooming.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a distance sensor-based zooming method and system for a mobile device, in which a display object such as a picture is automatically zoomed in when the mobile device is far away from the eyes of a user, and the display object is automatically zoomed out when the mobile device is close to the eyes of the user. The use mode is in accordance with ergonomics, and simultaneously, the user experience can be improved, and particularly, the use of a large-size mobile device is more convenient and comfortable.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a zooming method based on a distance sensor is characterized in that: and acquiring the distance c from the mobile equipment to the eyes of the user in real time, and determining the scaling ratio by the mobile equipment according to the distance c to scale the display object.

Preferably, the method comprises the following steps:

s1, acquiring data of an accelerometer and a gyroscope of the distance sensor in real time;

and S2, obtaining the distance c by adopting a quaternion method according to the data acquired in the step S1.

More preferably, step S2 includes:

s21, defining the posture of the mobile device in the geographic coordinate system as a quaternion (q)₀，q₁，q₂，q₃) The quaternion (q) is obtained by solving the following differential equation₀，q₁，q₂，q₃)：

$\left[\begin{array}{c}{\stackrel{\·}{q}}_0\\ {\stackrel{\·}{q}}_1\\ {\stackrel{\·}{q}}_2\\ {\stackrel{\·}{q}}_3\end{array}\right]=\frac{1}{2}\mathrm{\ω}\left(t\right)Q\left(t\right)=\frac{1}{2}\left[\begin{array}{cccc}0& -{\mathrm{\ω}}_{nx}^b& -{\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b\\ {\mathrm{\ω}}_{nx}^b& 0& {\mathrm{\ω}}_{nz}^b& -{\mathrm{\ω}}_{ny}^b\\ {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b& 0& {\mathrm{\ω}}_{nx}^b\\ {\mathrm{\ω}}_{nz}^b& {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nx}^b& 0\end{array}\right]\left[\begin{array}{c}{q}_0\\ q_1\\ q_2\\ q_3\end{array}\right]$

Wherein,is the derivative of the quaternion, ω (t) is the angular velocity, Q (t) is the current quaternion,the angular velocities of the x axis, the y axis and the z axis output by the gyroscope are respectively, n is a geographic coordinate system, and b is a distance sensor coordinate system;

s22, obtaining the included angle gamma between the connecting line of the wrist and the elbow joint of the user and the connecting line of the elbow joint and the eye part by the following formula:

$\mathrm{\γ}=1-2q_1^2-2q_2^2;$

s23, obtaining the distance c by:

c²＝a²+b²-2abcos(γ)

wherein, a is the distance from the wrist to the elbow joint of the user, and b is the distance from the elbow joint of the user to the eyes.

More preferably, the included angle γ, the distance c and the scaling are obtained by a system-on-chip operation.

Further, the display object is zoomed by the CPU of the system-on-chip according to the zoom scale.

Preferably, the scaling is proportional to the distance c.

A zooming system for realizing any one of the zooming methods based on the distance sensor comprises an accelerometer and a gyroscope and further comprises a chip, wherein the chip comprises:

the distance sensing processing module is used for receiving data output by the accelerometer and the gyroscope in real time and calculating a scaling ratio through a quaternion method;

and the CPU is used for receiving the scaling output by the distance sensing processing module and scaling the display object according to the scaling.

Preferably, the chip is a system-on-chip.

By adopting the technical scheme, compared with the prior art, the invention has the following advantages: the mobile equipment is automatically enlarged when the mobile equipment is taken away from the display objects such as the eye images, the web pages and the like of the user, the display objects close to the eyes of the user are automatically reduced, the user can hold the mobile equipment with two hands, the use mode accords with human engineering, and meanwhile, the use mode can improve the user experience, is comfortable and more reasonable to use, and is suitable for large-size mobile equipment; and for small-sized tablet or mobile phone, the method is also suitable, and the zooming can be realized by holding with only one hand.

Drawings

FIG. 1 is a diagram illustrating a usage status of a mobile device according to the present invention;

FIG. 2 is a schematic diagram of the zooming principle of the present invention;

FIG. 3 is a schematic diagram illustrating the solution of the distance γ according to the present invention;

FIG. 4 is a block diagram of a zoom system of the present invention.

Wherein, 1, an accelerometer; 2. a gyroscope; 3. a system-on-chip; 31. a distance sensing processing module; 32. a CPU.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art.

A user holds a large-sized mobile device, such as a tablet, using two hands in a manner as shown in fig. 1. As shown in fig. 2, the scaling method of the present invention includes: the distance between the flat plate and the eyes of a user is obtained in real time through the distance reactor of the flat plate, the scaling of display objects such as pictures, web pages and the like displayed on the flat plate screen is determined according to the distance, and then the display objects are correspondingly scaled according to the scaling. Specifically, the distance is proportional to the size of the display object, and as the distance increases, the display object increases; the subtended distance decreases and the display object shrinks.

As shown in fig. 3, a is a distance from the wrist to the elbow joint of the user, and is substantially constant; b is the distance from the elbow joint of the user to the eyes and is basically a constant; the angle gamma between the connecting line of the wrist and elbow joint of the user and the connecting line of the elbow joint and eye changes with the change of the using posture of the user, and is a variable which can be obtained by a distance sensor in the flat plate. Thus, the distance c between the plate and the user's eyes can be calculated by a, b and γ. Since a, b are both constants, c depends only on γ. According to the invention, the included angle gamma is calculated by adopting a quaternion method according to the three-axis accelerometer and the three-axis gyroscope of the distance sensor.

The scaling method based on the distance reactor specifically comprises the following steps:

s1, acquiring data of an accelerometer and a gyroscope of the distance sensor in real time;

s2, obtaining the distance c by a quaternion method according to the data acquired in the step S1;

and S3, determining the scaling of the display object according to the distance c.

Step S2 specifically includes:

s21, defining the posture of the mobile device in the geographic coordinate system as a quaternion (q)₀，q₁，q₂，q₃) The quaternion (q) is obtained by solving the following differential equation₀，q₁，q₂，q₃)：

$\left[\begin{array}{c}{\stackrel{\·}{q}}_0\\ {\stackrel{\·}{q}}_1\\ {\stackrel{\·}{q}}_2\\ {\stackrel{\·}{q}}_3\end{array}\right]=\frac{1}{2}\mathrm{\ω}\left(t\right)Q\left(t\right)=\frac{1}{2}\left[\begin{array}{cccc}0& -{\mathrm{\ω}}_{nx}^b& -{\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b\\ {\mathrm{\ω}}_{nx}^b& 0& {\mathrm{\ω}}_{nz}^b& -{\mathrm{\ω}}_{ny}^b\\ {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b& 0& {\mathrm{\ω}}_{nx}^b\\ {\mathrm{\ω}}_{nz}^b& {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nx}^b& 0\end{array}\right]\left[\begin{array}{c}{q}_0\\ q_1\\ q_2\\ q_3\end{array}\right]$

Wherein,determining an initial value for the quaternion differential by the accelerometer; ω (t) is the angular velocity, Q (t) is the current quaternion,the angular velocities of the x axis, the y axis and the z axis output by the gyroscope are respectively, n is a geographic coordinate system, and b is a distance sensor coordinate system;

s22, obtaining the included angle γ by the following formula:

$\mathrm{\γ}=1-2q_1^2-2q_2^2;$

s23, obtaining the distance c by the following formula

c²＝a²+b²-2abcos(γ)。

Referring to fig. 4, a distance sensor-based scaling system for implementing the above scaling method includes a three-axis accelerometer 1 and a three-axis gyroscope 2, and further includes a system on chip 3 (SOC), where the SOC3 includes:

a distance sensing processing module 31(SensorSignalProcessing) for receiving data output by the triaxial accelerometer 1 and triaxial gyroscope 2 in real time and calculating a scaling ratio by a quaternion method;

and a CPU32 for receiving the scaling ratio output by the distance sensing processing module 31 and scaling the display object according to the scaling ratio.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (8)

1. A zooming method based on a distance sensor is characterized in that: and acquiring the distance c from the mobile equipment to the eyes of the user in real time, and determining the scaling ratio by the mobile equipment according to the distance c to scale the display object.

2. The distance sensor-based scaling method according to claim 1, comprising the steps of:

s1, acquiring data of an accelerometer and a gyroscope of the distance sensor in real time;

and S2, obtaining the distance c by adopting a quaternion method according to the data acquired in the step S1.

3. The method for scaling based on a distance sensor according to claim 2, wherein step S2 comprises:

s21, defining the posture of the mobile device in the geographic coordinate system as a quaternion (q)₀，q₁，q₂，q₃) The quaternion (q) is obtained by solving the following differential equation₀，q₁，q₂，q₃)：

$\left[\begin{array}{c}{\stackrel{\·}{q}}_0\\ {\stackrel{\·}{q}}_1\\ {\stackrel{\·}{q}}_2\\ {\stackrel{\·}{q}}_3\end{array}\right]=\frac{1}{2}\mathrm{\ω}\left(t\right)Q\left(t\right)=\frac{1}{2}\left[\begin{array}{cccc}0& -{\mathrm{\ω}}_{nx}^b& -{\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b\\ {\mathrm{\ω}}_{nx}^b& 0& {\mathrm{\ω}}_{nz}^b& -{\mathrm{\ω}}_{ny}^b\\ {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nz}^b& 0& {\mathrm{\ω}}_{nx}^b\\ {\mathrm{\ω}}_{nz}^b& {\mathrm{\ω}}_{ny}^b& -{\mathrm{\ω}}_{nx}^b& 0\end{array}\right]\left[\begin{array}{c}{q}_o\\ q_1\\ q_2\\ q_3\end{array}\right]$

Wherein,is the derivative of the quaternion, ω (t) is the angular velocity, Q (t) is the current quaternion,the angular velocities of the x axis, the y axis and the z axis output by the gyroscope are respectively, n is a geographic coordinate system, and b is a distance sensor coordinate system;

s22, obtaining the included angle gamma between the connecting line of the wrist and the elbow joint of the user and the connecting line of the elbow joint and the eye part by the following formula:

$\mathrm{\γ}=1-2q_1^2-2q_2^2;$

s23, obtaining the distance c by:

c²＝a²+b²-2abcos(γ)

wherein, a is the distance from the wrist to the elbow joint of the user, and b is the distance from the elbow joint of the user to the eyes.

4. The distance sensor-based scaling method of claim 3, wherein: and obtaining the included angle gamma, the distance c and the scaling through system-level chip operation.

5. The distance-sensor-based scaling method of claim 4, wherein: and zooming the display object according to the zooming proportion by the CPU of the system-on-chip.

6. The range-sensor-based scaling method of claim 1, wherein: the scaling is proportional to the distance c.

7. A zooming system for realizing any one of the zooming methods based on the distance sensor comprises an accelerometer and a gyroscope, and is characterized by further comprising a chip, wherein the chip comprises:

the distance sensing processing module is used for receiving data output by the accelerometer and the gyroscope in real time and calculating a scaling ratio through a quaternion method;

and the CPU is used for receiving the scaling output by the distance sensing processing module and scaling the display object according to the scaling.

8. The zoom system of claim 7, wherein: the chip is a system-on-chip.