TWI906985B - Dual-lens electronic apparatus and image consistency improvement method thereof - Google Patents

Abstract

The disclosure provides a dual-lens electronic apparatus and an image consistency improvement method thereof. The method is adapted to the dual-lens electronic apparatus including a first lens module and a second lens module, and includes the following steps. An autofocus procedure is executed using the first lens module to obtain a focusing object distance and a first target driving current for a first actuator motor of the first lens module. A second target driving current for a second actuator motor of the second lens module is determined based on the focusing object distance and a second focus lookup table of the second lens module. The second focus lookup table of the second lens module records mapping relationship between multiple preset focusing distances and multiple second driving currents of the second actuator motor. A first perspective image is captured through the first lens module by driving the first actuator motor according to the first target driving current. A second perspective image is captured through the second lens module by driving the second actuator motor according to the second target driving current.

Description

Methods for improving image consistency in dual-lens electronic devices

This invention relates to an electronic device, and more particularly to a dual-lens electronic device and a method for improving image consistency.

Currently, the applications of binocular stereo vision technology are constantly expanding, and dual-lens camera systems have become a key component for acquiring images from different perspectives. Based on binocular stereo vision technology, dual-lens electronic products can acquire images from different perspectives through a dual-lens camera system, thereby generating depth information for the shooting scene based on the image content from each perspective. It is important to note that in the application of binocular stereo vision technology, if the lens characteristics and image quality of different lens modules differ too much, it will have a negative impact on subsequent applications. For example, it may cause inaccurate depth estimation results or poor feature matching results, preventing successful dual-lens spatial correction. However, due to inconsistencies in component characteristics or assembly tolerances between the first and second lens modules in a dual-lens camera system, there is a discrepancy in image sharpness between the images captured by the first and second lens modules.

In view of this, the present invention provides a method for improving the image consistency of a dual-lens electronic device, which can be used to solve the aforementioned technical problems.

This invention provides an image consistency improvement method suitable for a dual-lens electronic device including a first lens module and a second lens module. The method includes the following steps: 1. Executing an autofocus procedure using the first lens module to obtain a focus distance and a first target driving current of a first actuation motor of the first lens module. 2. Determining a second target driving current of a second actuation motor of the second lens module according to a second focus lookup table of the second lens module. The second focus lookup table of the second lens module records mapping relationships between multiple preset focus distances and multiple second driving currents of the second actuation motor. 3. Capturing a first viewpoint image through the first lens module by driving the first actuation motor according to the first target driving current. A second-angle image is captured through a second camera module by driving a second actuator motor with a second target-driven current.

This invention provides a dual-lens electronic device including a first lens module, a second lens module, a storage device, and a processor. The processor is coupled to the first lens module, the second lens module, and the storage device, and configured to perform the following operations: An autofocus procedure is executed using the first lens module to obtain the focusing distance and a first target driving current of a first actuation motor of the first lens module. A second target driving current of a second actuation motor of the second lens module is determined according to a second focus lookup table of the focusing distance and the second lens module. The second focus lookup table of the second lens module records a mapping relationship between multiple preset focusing distances and multiple second driving currents of the second actuation motor. A first viewpoint image is captured through a first lens module by driving a first actuator motor with a first target driving current. A second viewpoint image is captured through a second lens module by driving a second actuator motor with a second target driving current.

Based on the above, in an embodiment of the present invention, by using a focus lookup table pre-established based on a lens calibration procedure, the motor drive current applied to the second lens module can be determined according to the focusing result of the first lens module. This improves the consistency of image sharpness across different viewpoints, thereby enhancing the application quality of binocular stereoscopic vision technology.

100: Dual-lens electronic device

110: First-person camera module

111: First Actuating Motor

120: Second Camera Module

121: Second Actuator

T1: First Focus Lookup Table T1: First Focus Lookup Table Taiwanese Focus Lookup Table ...

T2: Second Focus Lookup Table Taiwanese Focus Lookup Table

130: Storage device

140: Processor

150: Motion Sensor

S210~S240, S310~S340, S410~S450, S510~S560: Steps

Figure 1A is a schematic diagram of a dual-lens electronic device according to an embodiment of the present invention.

Figure 1B is a schematic diagram of a dual-lens configuration according to an embodiment of the present invention.

Figure 2 is a flowchart of an image consistency improvement method according to an embodiment of the present invention.

Figure 3 is a flowchart of a lens calibration procedure according to an embodiment of the present invention.

Figure 4 is a flowchart of an image consistency improvement method according to an embodiment of the present invention.

Figure 5 is a flowchart of an image consistency improvement method according to an embodiment of the present invention.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Component symbols used in the following description are considered identical or similar components when the same component symbol appears in different accompanying drawings. These embodiments are only a part of the present invention and do not disclose all possible embodiments of the present invention. More precisely, these embodiments are merely examples of methods and apparatuses within the scope of the patent applications of the present invention.

Figure 1A is a schematic diagram of a dual-lens electronic device according to an embodiment of the present invention. Referring to Figure 1A, in different embodiments, the dual-lens electronic device 100 may be, for example, a head-mounted display, a laptop, a smart TV, a tablet computer, a game console, a mobile phone, etc., and the present invention is not limited thereto. In Figure 1A, the dual-lens electronic device 100 may include a first lens module 110, a second lens module 120, a storage device 130, a processor 140, and a motion sensor 150.

The first lens module 110 and the second lens module 120 each include a photosensitive element and a lens. The photosensitive elements of each lens module 110 and the second lens module 120 are used to sense the intensity of light entering the corresponding lens and thus generate images. The photosensitive element may be, for example, a charge-coupled device (CCD), a complementary metal-oxide-semiconductor (CMOS) element, or other elements; this invention is not limited thereto.

The first lens module 110 includes a first actuation motor 111 for pushing the lens of the first lens module 110. The second lens module 120 includes a second actuation motor 121 for pushing the lens of the second lens module 120. By controlling the motor drive current supplied to the first actuation motor 111, the first actuation motor 111 can be controlled to move the lens of the first lens module 110 to a designated position. Similarly, by controlling the motor drive current supplied to the second actuation motor 121, the second actuation motor 121 can be controlled to move the lens of the second lens module 120 to a designated position.

In some embodiments, the first actuating motor 111 and the second actuating motor 121 are both voice coil motors (VCMs). A voice coil motor is a type of motor that uses electromagnetic force to achieve linear motion. When an electric current flows through the motor coil of a voice coil motor, the motor coil is subjected to a force in the magnetic field and moves accordingly.

Please refer to Figure 1B, which is a schematic diagram of a dual-lens configuration according to an embodiment of the present invention. A first lens module 110 is used to capture a first viewpoint image (e.g., a left-eye image), while a second lens module 120 is used to capture a second viewpoint image (e.g., a right-eye image). The first and second viewpoint images can be applied to technologies such as stereoscopic imaging, stereoscopic photography, panoramic photography, virtual reality (VR), or augmented reality (AR). In some embodiments, the lens specifications of the first lens module 110 and the second lens module 120 are identical. In some embodiments, the optical axes of the first lens module 110 and the second lens module 120 are substantially parallel to each other.

Storage device 130 can be used to store data such as images, instructions, program code, and software modules. It can be, for example, any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory, hard disk, or other similar devices, integrated circuits, or combinations thereof. Storage device 130 records a first focus lookup table T1 for the first lens module 110 and a second focus lookup table T2 for the second lens module 120. The first focus lookup table T1 and the second focus lookup table T2 can be created by performing lens calibration procedures on the first lens module 110 and the second lens module 120 respectively. Details regarding the first focus lookup table T1 and the second focus lookup table T2 will be clearly explained in the embodiments described later.

Motion sensor 150 is used to sense the shooting direction of the dual-lens electronic device 100. Motion sensor 150 may include a gravity sensor. For example, motion sensor 150 can be used to detect whether the shooting direction of the dual-lens electronic device 100 is horizontally upward, horizontally downward, or horizontally forward.

Processor 140 is coupled to first camera module 110, second camera module 120, motion sensor 150, and storage device 130, such as a central processing unit (CPU), application processor (AP), or other programmable general-purpose or special-purpose microprocessor, digital signal processor (DSP), image signal processor (ISP), graphics processing unit (GPU), neural network processor (NPU), or other similar device, integrated circuit, or combination thereof.

Processor 140 can access and execute software modules recorded in storage device 130 to implement the image consistency improvement method in this embodiment of the invention. The aforementioned software modules can be broadly interpreted as instructions, instruction sets, code, program code, programs, applications, software suites, executable threads, procedures, functions, etc., regardless of whether they are called software, firmware, middleware, microcode, hardware description languages, or others.

Figure 2 is a flowchart of an image consistency improvement method according to an embodiment of the present invention. Referring to Figure 2, the method of this embodiment can be executed by the dual-lens electronic device 100 shown in Figure 1. The details of each step in Figure 2 are explained below with reference to the components shown in Figure 1.

In step S210, processor 140 executes an autofocus procedure using the first lens module 110 to obtain the focusing object distance and the first target driving current of the first actuator motor 111 of the first lens module 110. In different embodiments, processor 140 may apply various autofocus algorithms to implement the autofocus procedure; this invention does not limit the autofocus algorithm. For example, the autofocus algorithm may be a contrast detection autofocus algorithm, a phase detection autofocus algorithm, a deep learning autofocus algorithm, or a predictive autofocus algorithm using a range sensor, etc.

In other words, after executing the autofocus procedure using the first lens module 110, the processor 140 can acquire a first target driving current to move the lens of the first lens module 110 to the optimal position. Furthermore, the focusing object distance is the distance between the first lens module 110 and the object being focused on. In different embodiments, the focusing object distance can be obtained by looking up a table or using a rangefinder.

In step S220, processor 140 determines the second target driving current of the second actuator motor 121 of the second lens module 120 based on the focus distance and the second focus lookup table T2 of the second lens module 120. Specifically, the second focus lookup table T2 of the second lens module 120 can be obtained through prior testing. The second focus lookup table T2 of the second lens module 120 records the mapping relationship between multiple preset focus distances and multiple second driving currents of the second actuator motor 121. The second focus lookup table T2 of the second lens module 120 can be stored in storage device 130.

The processor 140 looks up the second focus lookup table T2 of the second lens module 120 based on the focusing result of the first lens module 110, and determines the second target drive current of the second actuator 121 based on at least one second drive current in the second focus lookup table T2. When the focusing distance in the focusing result of the first lens module 110 is equal to one of the multiple preset focusing distances in the second focus lookup table T2, the processor 140 can identify a certain second drive current corresponding to one of the multiple preset focusing distances as the second target drive current. When the focusing distance in the focusing result of the first lens module 110 is not equal to one of the multiple preset focusing distances in the second focusing lookup table T2, the processor 140 can determine the second target driving current by interpolating at least two second driving currents corresponding to at least two of the multiple preset focusing distances.

In step S230, processor 140 drives first actuator 111 according to a first target driving current to capture a first viewpoint image through first lens module 110. In step S240, processor 140 drives second actuator 121 according to a second target driving current to capture a second viewpoint image through second lens module 120. It should be noted that, due to differences in hardware characteristics or assembly tolerances between the first lens module 110 and the second lens module 120, the first target driving current will differ from the second target driving current.

Therefore, by determining the second target driving current of the second lens module 120 through a lookup table based on the focusing result of the first lens module 110, not only can good focusing efficiency be achieved, but the sharpness of the first and second viewpoint images can also be made consistent. This is because the mapping relationship between multiple second driving currents used to obtain good resolution and multiple preset focusing object distances is recorded in the second focus lookup table T2. When the first viewpoint image has good resolution through the autofocus program, the second focus lookup table T2 can be consulted based on the focusing result of the first lens module 110 to ensure that the resolution of the second viewpoint image is consistent with that of the first viewpoint image.

In some embodiments, processor 140 may perform a lens calibration procedure on the first lens module 110 to establish a first focus lookup table T1 for the first lens module 110. The first focus lookup table T1 of the first lens module 110 records the mapping relationships between multiple preset focus distances and multiple first driving currents of the first actuator 111. Similarly, processor 140 may perform a lens calibration procedure on the second lens module 120 to establish a second focus lookup table T2 for the second lens module 120. The second focus lookup table T2 of the second lens module 120 records the mapping relationships between multiple preset focus distances and multiple second driving currents of the second actuator 121.

For example, Table 1 is an example of the first focus lookup table T1 for the first lens module 110, and Table 2 is an example of the second focus lookup table T2 for the second lens module 120. However, Tables 1 and 2 are only used as illustrative examples and are not intended to limit the invention.

Figure 3 is a flowchart of a lens calibration procedure according to an embodiment of the present invention. It should be noted that the flowchart shown in Figure 3 can be executed separately for the first lens module 110 and the second lens module 120 to generate a first focus lookup table T1 and a second focus lookup table T2.

Referring to Figure 3, in step S310, configure the lens module (i.e., the first lens module 110 or the second lens module 120) and calibration pattern according to a preset focus distance. The calibration pattern can be a pattern on a calibration chart or a pattern displayed on a screen. For example, when performing a lens calibration procedure with a preset focus distance of 10cm, the tester or test equipment will configure the lens module and calibration image at a distance of 10cm.

In step S320, processor 140 controls the lens module (i.e., the first lens module 110 or the second lens module 120) to capture multiple calibration images of the calibration pattern using multiple candidate driving currents. That is, the lens moves to different positions based on different candidate driving currents to capture multiple calibration images. In step S330, processor 140 calculates the sharpness of the multiple calibration images. Processor 140 may use methods such as the Brenner gradient function, Laplacian gradient function, or variance function to detect the sharpness of the calibration images.

In step S340, processor 140 records the candidate drive current corresponding to the highest-resolution calibration image as the drive current corresponding to the preset focus distance. Using the example in Table 1, when a drive current of 150mA is provided to the first actuator 111, the sharpest calibration image can be captured at a preset focus distance of 10cm. Therefore, processor 140 records 150mA as the first drive current corresponding to the preset focus distance of 10cm. Using the example in Table 2, when a drive current of 155mA is provided to the second actuator 121, the sharpest calibration image can be captured at a preset focus distance of 10cm. Therefore, the processor records 155mA as a second drive current corresponding to a preset focus distance of 10cm.

In other words, by repeatedly executing the steps shown in FIG3 according to different preset focus distances, the processor 140 can obtain multiple first driving currents corresponding to different preset focus distances to establish a first focus lookup table T1 for the first lens module 110. Similarly, by repeatedly executing the steps shown in FIG3 according to different preset focus distances, the processor 140 can obtain multiple second driving currents corresponding to different preset focus distances to establish a second focus lookup table T2 for the second lens module 120.

It is worth noting that the first lens module 110 and the second lens module 120 may shoot from different directions. The shooting direction can be defined as the angle between the lens optical axis and the horizon. When the shooting direction is horizontal, the angle between the lens optical axis and the horizon is approximately 0 degrees. When the shooting direction is horizontally upward, the angle between the lens optical axis and the horizon is approximately 90 degrees. When the shooting direction is horizontally downward, the angle between the lens optical axis and the horizon is approximately -90 degrees. Due to gravity and motor structure characteristics, the shooting direction of the first lens module 110 and the second lens module 120 will affect the relationship between the driving current and the lens movement distance.

Therefore, the processor 140 can perform lens calibration procedures separately when the first lens module 110 is shooting from different shooting directions, and obtain multiple preset focus tables corresponding to the first lens module 110 for different shooting directions. For example, when the first lens module 110 is in a lens-up position, the processor 140 can repeatedly execute the steps shown in FIG3 according to different preset focus distances, and obtain a preset focus table corresponding to the lens-up position. When the first lens module 110 is in a lens-down position, the processor 140 can repeatedly execute the steps shown in FIG3 according to different preset focus distances, and obtain another preset focus table corresponding to the lens-down position. In other words, the first focus table T1 shown in Table 1 example can be, for example, a preset focus table corresponding to the lens facing forward. Similarly, the processor 140 can also perform lens calibration procedures separately when the second lens module 120 is shooting from different shooting directions, thereby obtaining multiple preset focus tables corresponding to the second lens module 120 for different shooting directions.

Figure 4 is a flowchart of an image consistency improvement method according to an embodiment of the present invention. Referring to Figure 4, the method of this embodiment can be executed by the dual-lens electronic device 100 shown in Figure 1. The details of each step in Figure 4 are explained below with reference to the components shown in Figure 1.

In step S410, processor 140 executes an autofocus procedure using the first lens module 110 to obtain the focusing object distance and the first target driving current of the first actuation motor 111 of the first lens module 110. In some embodiments, step S410 may be implemented as steps S411 to S412.

In step S411, processor 140 obtains the first target driving current of the first actuator motor 111 by executing an autofocus procedure using the first lens module 110. In step S412, processor 140 determines the focusing distance based on the first target driving current and the first focusing lookup table T1 of the first lens module 110.

Specifically, when the first target driving current equals a first driving current in the first focus lookup table T1, the processor 140 can directly identify the preset focus distance corresponding to that first driving current as the current focus distance. When the first target driving current is not equal to any first driving current in the first focus lookup table T1, the processor 140 can perform interpolation processing based on the two preset focus distances in the first focus lookup table T1 to determine the current focus distance.

For example, referring to Table 1, when the first target driving current of the first actuator 111 is 120mA, the processor 140 can determine the current focusing distance as 20cm based on the first focus lookup table T1. When the first target driving current of the first actuator 111 is 100mA, the processor 140 can calculate the current focusing distance as 35cm based on the first focus lookup table T1.

In step S420, processor 140 determines the second target driving current of the second actuator 121 of the second lens module 120 based on the focusing object distance and the second focus lookup table T2 of the second lens module 120. In some embodiments, step S420 may be implemented as steps S421 to S422.

In step S421, processor 140 can obtain two of the multiple preset focus distances closest to the focus object distance in the second focus lookup table T2. In step S421, processor 140 can perform interpolation processing on two of the multiple driving currents corresponding to the two preset focus object distances to determine the second target driving current of the second actuator 121.

For example, referring to Table 2, when the focusing distance is equal to the preset focusing distance of 20cm, the processor 140 can determine that the second target driving current of the second actuator 121 is equal to 123mA. When the focusing distance is equal to 35cm, the processor 140 can determine that the second target driving current of the second actuator 121 is equal to 105mA (i.e., (123+87)/2)).

In step S430, processor 140 drives first actuator 111 according to a first target driving current to capture a first viewpoint image through first lens module 110. In step S440, processor 140 drives second actuator 121 according to a second target driving current to capture a second viewpoint image through second lens module 120.

In step S450, processor 140 performs edge enhancement processing on both the first viewpoint image and the second viewpoint image using the same sharpening parameter. For example, the sharpening parameter could be a boost factor for High Boost Filtering. Processor 140 performs edge enhancement processing on both the first viewpoint image and the second viewpoint image according to the same sharpening parameter to generate edge-enhanced images of the first viewpoint image and the second viewpoint image. Edge enhancement processing can enhance edges or details in the image, making the image sharper. In some embodiments, edge enhancement processing is, for example, High Boost Filtering processing, but it is not limited to this. Furthermore, when the first-view image and the second-view image have the same sharpening resolution, the processor 140 can use the same sharpening parameters to perform edge enhancement, thereby improving the efficiency of edge enhancement processing.

Figure 5 is a flowchart of an image consistency improvement method according to an embodiment of the present invention. Referring to Figure 5, the method of this embodiment can be executed by the dual-lens electronic device 100 shown in Figure 1. The details of each step in Figure 2 are explained below with reference to the components shown in Figure 1.

In step S510, the processor 140 executes an autofocus procedure using the first lens module 110 to obtain the focusing distance and the first target driving current of the first actuation motor of the first lens module 110.

In step S520, processor 140 uses a motion sensor 150 to detect the shooting direction of the dual-lens electronic device 100. As described above, motion sensor 150 can be used to sense the device attitude of the dual-lens electronic device 100, so that processor 140 can obtain the shooting direction of the dual-lens electronic device 100 (i.e., the shooting direction of the first lens module 110 and the second lens module 120).

In step S530, the processor 140 selects a second focus lookup table T2 from multiple preset focus lookup tables in the second lens module 120 based on the shooting direction of the dual-lens electronics 100. As described in the foregoing embodiment, these preset focus lookup tables can correspond to different shooting directions. The processor 140 can select the second focus lookup table T2 corresponding to the current shooting direction from the multiple preset focus lookup tables based on the current shooting direction.

It should be noted that, similarly, before the processor 140 uses the first focus lookup table T1 of the first lens module 110, the processor 140 can select the first focus lookup table T1 from multiple preset focus lookup tables of the first lens module 110 according to the shooting direction of the dual-lens electronic device 100.

In step S540, processor 140 determines the second target driving current of the second actuator motor 121 of the second lens module 120 based on the focusing object distance and the second focus lookup table T2 of the second lens module 120. In step S550, processor 140 drives the first actuator motor 111 according to the first target driving current to capture a first viewpoint image through the first lens module 110. In step S560, processor 140 drives the second actuator motor 121 according to the second target driving current to capture a second viewpoint image through the second lens module 120.

It should be noted that the processing procedure of the image consistency improvement method executed by at least one processor is not limited to the above-described implementation. For example, the steps can be executed in other orders. Furthermore, any two or more of the above steps can be combined, or a portion of the steps can be modified. Alternatively, other steps can be performed in addition to the steps described above.

In summary, in the embodiments of the present invention, the motor drive current applied to the second lens module can be determined based on the focusing result of the first lens module. This improves the consistency of image sharpness across different viewpoints, thereby enhancing the application quality of binocular stereoscopic vision technology. Furthermore, it also improves focusing efficiency and image edge enhancement processing efficiency.

Although the present invention has been disclosed above with examples, it is not intended to limit the invention. Anyone skilled in the art may make modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

S210~S240: Steps

Claims (10)

An image consistency improvement method is suitable for a dual-lens electronic device including a first lens module and a second lens module. The method includes: Executing an autofocus procedure using the first lens module to acquire a focus distance and a first target driving current of a first actuation motor of the first lens module; Determining a second target driving current of a second actuation motor of the second lens module according to the focus distance and a second focus lookup table of the second lens module, wherein the second focus lookup table of the second lens module records mapping relationships between multiple preset focus distances and multiple second driving currents of the second actuation motor; Capturing a first-angle image through the first lens module by driving the first actuation motor according to the first target driving current; and The second target driving current drives the second actuator motor, thereby capturing a second viewpoint image through the second camera module. The image consistency improvement method as described in claim 1, wherein the step of executing the autofocus procedure using the first lens module to obtain the focus distance and the first target driving current of the first actuation motor of the first lens module includes: obtaining the first target driving current of the first actuation motor by executing the autofocus procedure using the first lens module; and determining the focus distance according to the first target driving current and a first focus lookup table of the first lens module, wherein the first focus lookup table of the first lens module records the mapping relationship between the plurality of preset focus distances and the plurality of first driving currents of the first actuation motor. The image consistency improvement method as described in claim 2 further includes: performing a lens calibration procedure on the first lens module to establish a first focus lookup table for the first lens module; and performing the lens calibration procedure on the second lens module to establish a second focus lookup table for the second lens module. The image consistency improvement method as described in claim 1, wherein the step of determining the second target driving current of the second actuator of the second lens module based on the focusing distance and the second focusing lookup table of the second lens module includes: obtaining two of the plurality of preset focusing distances in the second focusing lookup table that are closest to the focusing distance; and performing an interpolation process on two of the plurality of driving currents corresponding to the two of the plurality of preset focusing distances to determine the second target driving current of the second actuator. The image consistency improvement method as described in claim 1, wherein the first actuating motor and the second actuating motor are each a voice coil motor. The image consistency improvement method as described in claim 1 further includes: detecting the shooting direction of the dual-lens electronic device using a motion sensor; and selecting a second focus lookup table from a plurality of preset focus lookup tables of the second lens module based on the shooting direction of the dual-lens electronic device. The image consistency enhancement method as described in claim 1 further includes: Performing image edge enhancement processing on both the first view image and the second view image using the same sharpening parameters. A dual-lens electronic device includes: a first lens module including a first actuation motor; a second lens module including a second actuation motor; a storage device; and a processor coupled to the first lens module, the second lens module, and the storage device, and configured to: execute an autofocus procedure using the first lens module to acquire a focus distance and a first target driving current of the first actuation motor; determine a second target driving current of the second actuation motor according to the focus distance and a second focus lookup table of the second lens module, wherein the second focus lookup table of the second lens module records mapping relationships between multiple preset focus distances and multiple second driving currents of the second actuation motor; A first-view image is captured through the first lens module by driving the first actuator motor with a first target driving current; and a second-view image is captured through the second lens module by driving the second actuator motor with a second target driving current. The dual-lens electronic device as claimed in claim 8, wherein the storage device records a first focus lookup table of the first lens module and a second focus lookup table of the second lens module, and the first focus lookup table of the first lens module records the mapping relationship between the plurality of preset focus distances and the plurality of first driving currents of the first actuating motor. The dual-lens electronic device as claimed in claim 8 further includes a motion sensor for sensing the shooting direction of the dual-lens electronic device, wherein the processor selects a second focus lookup table from a plurality of preset focus lookup tables of the second lens module based on the shooting direction of the dual-lens electronic device.