TWI619390B - Electronic device and lens switching method thereof - Google Patents

Abstract

The present invention discloses an electronic device and a lens switching method thereof. The electronic device includes: a lens module including a standard lens, a macro lens, and a telephoto lens; and an image sensor for passing the image sensor The plurality of lenses acquire a picture of a shooting target; the focusing module is configured to control the plurality of lenses to automatically focus the shooting target; and the processor is configured to select the standard lens as the current lens, in the first Obtaining a corresponding first focus distance at a time, acquiring a corresponding second focus distance at a second time, and determining whether to switch the current lens to the macro lens or according to the magnitude relationship between the second focus distance and the first focus distance The telephoto lens, wherein the second time is later than the first time.

Description

Electronic device and lens switching method thereof

The present invention relates to an electronic device and a lens switching method thereof, and more particularly to an electronic device capable of automatically switching between a macro and a telephoto lens and a lens switching method thereof.

Electronic devices such as mobile phones have a camera module for shooting, but the conventional camera module has only a single lens, and the focus is slow and the accuracy is not good for focusing when shooting, especially when switching to a macro object. High, hindering shooting.

In view of the above, it is necessary to provide an electronic device that can automatically switch between macro and telephoto lenses.

In addition, it is necessary to provide a lens switching method corresponding to the above electronic device.

An electronic device includes: a lens module including a standard lens, a macro lens, and a telephoto lens; and an image sensor for acquiring a shooting target through the plurality of lenses a focusing module, the focusing module is configured to control the plurality of lenses to automatically focus the shooting target, and a processor, the processor is configured to select the standard lens as the current lens, and obtain the corresponding first focusing at the first time a distance, obtaining a corresponding second focusing distance at a second time, and according to the The magnitude relationship between the second focus distance and the first focus distance determines whether the current lens is switched to the macro lens or the distance lens, wherein the second time is later than the first time.

A lens switching method is applied to an electronic device, the electronic device comprising a lens module and an image sensor, the lens module comprising a standard lens, a macro lens and a telephoto lens, the method comprising: Selecting the standard lens as the current lens, acquiring a corresponding first focus distance at a first time, and acquiring a corresponding second focus distance at a second time; Determining whether to switch the current lens to the macro lens or the telephoto lens according to the magnitude relationship of the focus distance, wherein the second time is later than the first time.

The electronic device and the lens switching method thereof can automatically switch the current lens to a macro lens or a remote lens according to actual needs of the user, and the shooting is convenient, and the picture quality can be ensured.

100‧‧‧Electronic devices

10‧‧‧Lens module

11‧‧‧Standard lens

12‧‧‧Macro lens

13‧‧‧Distance lens

20‧‧‧Image Sensor

30‧‧‧ Focus Module

31‧‧‧Sound coil motor

40‧‧‧ processor

50‧‧‧ memory

1 is a functional block diagram of an electronic device in accordance with a preferred embodiment of the present invention.

2 is a flow chart of a lens switching method according to a preferred embodiment of the present invention.

1 is a functional block diagram of an electronic device 100 in accordance with a preferred embodiment of the present invention. The electronic device can be a mobile phone, a tablet computer, and a personal digital assistant.

The electronic device 100 includes a lens module 10 , an image sensor 20 , a focus module 30 , a processor 40 , and a memory 50 . The lens module 10, the image sensor 20, the focus module 30, and the memory 50 are all connected to the processor 40.

In the preferred embodiment, the lens module 10 includes a standard lens 11, a distance lens 13 and a macro lens 12. The standard lens 11 is a general lens device for general distance shooting. The telephoto lens 13 and the macro lens 12 are used for remote and macro photography, respectively. The angle of view of the telephoto lens 13 is narrower than that of the standard lens 11.

The image sensor 20 is configured to acquire a picture of a shooting target through the standard lens 11, the distance lens 13 or the macro lens 12 described above.

The focusing module 30 is configured to control the plurality of lenses, that is, the standard lens 11, the distance lens 13 and the macro lens 12 to perform auto focusing to obtain a clear picture. The focus module 30 includes a voice coil motor 31 for driving the lens to focus.

The memory 50 is used for storing various programs and materials of the electronic device 100, such as a program for controlling the processor 40 to execute the lens switching method shown in FIG. 2, and a first focusing distance and a second method in the method flow of FIG. 2. Focus distance, preset conditions for picture quality, preset values for crop ratio, etc.

2 is a flow chart of a preferred embodiment of the lens switching method of the present invention. The shot switching method is performed by the processor 40 and includes the following steps. The preferred embodiment is also a preferred embodiment of the invention. The order of execution in the flowchart shown in the figure may vary depending on various requirements, and some may be omitted.

In step 300, the processor 40 selects the standard lens 11 as the current lens. It can be understood that the electronic device 100 can preset the standard lens as the current lens, and the step can be omitted.

In step 301, the processor 40 obtains a plurality of focus distances through the focus module 30 at a plurality of different times. The focusing distance is the distance between the lens module 10 and the shooting target. For example, the first focus distance is acquired correspondingly at the first time, and the second focus distance is acquired correspondingly at the second time, wherein the second time is later than the first time.

In the preferred embodiment, the focusing module 30 can obtain the focusing distance by using at least one of three ways: the first mode is laser ranging; the second mode is the image acquired according to the image sensor 20. The edge of the object in the picture is used to estimate the focus distance; the third way is to obtain the depth of field through the two lenses of the lens module 10, and use the depth of field to estimate the focus distance.

Step 302: The processor 40 compares the magnitude relationship between the second focus distance corresponding to the second time and the first focus distance corresponding to the first time. If the second focus distance is smaller than the first focus distance, the current focus distance is gradually reduced. The user is taking a closer shot. In step 303, the processor 40 needs to determine whether the current lens is suitable for the current distance shooting, and whether the current lens needs to be switched to the macro lens 12. If the second focus distance is greater than the first focus distance, it indicates that the current focus distance is gradually increasing, and the user is performing long distance shooting, then the process proceeds to step 306, and the processor 40 needs to determine whether the standard lens 11 is suitable for the current distance shooting, whether It is necessary to switch the current lens to the telephoto lens 13.

Step 303, the processor 40 determines whether the quality of the picture taken by the current lens meets the preset condition. If the quality of the picture taken by the current lens satisfies the preset condition, it indicates that the current lens can still satisfy the user's shooting requirement without switching the current lens. Return to step 302. If the quality of the picture taken by the current lens cannot satisfy the preset condition, it indicates that the current lens may not be able to satisfy the user's shooting requirement, and the process proceeds to step 304. In the preferred embodiment, the preset condition may be that the contrast or sharpness of the picture taken by the current lens is greater than the first preset value.

Step 304, the processor 40 further determines whether the current focus distance has reached the lower limit value of the focus distance of the lens module 10, and if the lower limit value has been reached, it indicates that the current lens is not satisfied by the auto focus. The conditional picture needs to be switched to the macro lens 12, therefore, the process proceeds to step 305. If the lower limit value is not reached, it means that the current lens does not need to be switched, and the process returns to step 303, and the current lens can be obtained by the autofocus until the current lens is satisfied. Picture.

Step 305, the processor 40 switches the current lens to the macro lens 12.

Step 306, the processor 40 determines whether the clipping ratio of the picture taken by the current lens is smaller than the second preset value. In step 306, the shooting picture is the original picture clipping part obtained by the image sensor 20 and is enlarged. Thereafter, the crop ratio is defined as the ratio of the area of the cropped portion to the area of the original picture. If the clipping ratio is greater than or equal to the second preset value, it indicates that the current lens can still meet the user's needs, and the current lens does not need to be switched, and the process returns to step 302. If the clipping ratio is less than the preset value, it indicates that the current lens is no longer able to meet the user's needs, and proceeds to step 307.

In step 307, the processor 40 switches the current lens to the telephoto lens 13.

Step 308, the image sensor 20 acquires a picture of the shooting target through the current lens.

The electronic device 100 and the lens switching method thereof can automatically switch the current lens to the macro lens 12 or the remote lens 13 according to the actual needs of the user, and the shooting is convenient, and the picture quality can be ensured.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

Claims (12)

An electronic device includes: a lens module including a standard lens, a macro lens, and a telephoto lens; and an image sensor for acquiring a shooting target through the plurality of lenses a focusing module, the focusing module is configured to control the plurality of lenses to automatically focus the shooting target, and a processor, the processor is configured to select the standard lens as the current lens, and obtain the corresponding first focusing at the first time a distance, obtaining a corresponding second focus distance at a second time, and determining whether to switch the current lens to the macro lens or the distance lens according to the magnitude relationship between the second focus distance and the first focus distance, wherein The second time is later than the first time. If the second focusing distance is smaller than the first focusing distance, the processor further determines whether the quality of the picture taken by the current lens meets the preset condition, and if the quality of the picture taken by the current lens satisfies the preset Condition, the processor does not switch the current lens, and if the quality does not satisfy the preset condition, the processor further Whether the current switching off the lens to the macro lens. The electronic device of claim 1, wherein if the second focus distance is greater than the first focus distance, the processor further determines whether to switch the current lens to the distance lens. The electronic device of claim 1, wherein if the quality does not satisfy the preset condition, the processor further determines whether the current focus distance has reached a lower limit value of the focus distance of the lens module, if the current If the focus distance has reached the lower limit value, the processor switches the current lens to the macro lens, and if the current focus distance does not reach the lower limit value, the processor does not switch the current lens. The electronic device of claim 1, wherein the preset condition is that the contrast or sharpness of the picture taken by the current lens is greater than the first preset value. The electronic device of claim 1, wherein if the second focus distance is greater than the first focus distance, the processor further determines whether the crop ratio of the picture taken by the current lens is less than a second preset value, if If the clipping ratio is greater than or equal to the second preset value, the processor does not switch the current lens, and if the clipping ratio is less than the second preset value, the processor switches the current lens to the remote lens. The electronic device of claim 5, wherein the picture taken by the current lens is obtained by zooming out an original picture cut portion obtained by the image sensor, and the clipping ratio is the cut portion. The ratio of the area to the area of the original picture. A lens switching method is applied to an electronic device, the electronic device comprising a lens module and an image sensor, the lens module comprising a standard lens, a macro lens and a telephoto lens, wherein the method comprises: selecting the As a current lens, the standard lens acquires a corresponding first focus distance at a first time, and acquires a corresponding second focus distance at a second time; and determines whether to switch the current lens to the macro lens according to the magnitude relationship of the focus distance or The telephoto lens, wherein the second time is later than the first time, if the second focusing distance is smaller than the first focusing distance, further determining whether the quality of the picture taken by the current lens meets the preset condition, if the current picture is taken by the current lens If the quality meets the preset condition, the processor does not switch the current lens, and if the quality does not satisfy the preset condition, further determines whether the current lens is switched to the macro lens. The lens switching method of claim 7, wherein if the second focusing distance is greater than the first focusing distance, it is further determined whether the current lens is switched to the telephoto lens. The lens switching method according to claim 7, wherein if the quality does not satisfy the preset condition, further determining whether the current focus distance has reached a lower limit value of the focus distance of the lens module, if the current focus distance If the lower limit value has been reached, the current lens is switched to the macro lens, and if the current focus distance does not reach the lower limit value, the current lens is not switched. The lens switching method of claim 7, wherein the preset condition is that the contrast or sharpness of the picture taken by the current lens is greater than the first preset value. The lens switching method of claim 7, wherein if the second focusing distance is greater than the first focusing distance, it is further determined whether the clipping ratio of the picture taken by the current lens is less than a second preset value, if the clipping ratio is If the second preset value is greater than or equal to the second preset value, the current lens is not switched, and if the clipping ratio is less than the second preset value, the current lens is switched to the remote lens. The lens switching method according to claim 11, wherein the picture taken by the current lens is obtained by zooming out an original picture cut portion obtained by the image sensor, and the clipping ratio is the cut portion. The ratio of the area of the share to the area of the original picture.