CN116634258A - Image capturing device and automatic framing method applied to same - Google Patents

Abstract

An image capturing device comprises an optical zoom lens module, a processing module and a motion sensing module. The optical zoom lens module captures an image corresponding to the first visual field range according to preset parameters. The automatic view finding unit of the processing module defines a second visual field range according to the position of the main object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range. The processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range. When the motion sensing module detects that the suspected target object enters the first visual field range, a switching signal is transmitted to the processing module. The processing module controls the optical zoom lens module to capture the image corresponding to the first visual field range according to the switching signal.

Description

Image capturing device and automatic framing method applied to same

Technical Field

The invention relates to an image capturing device and an automatic framing method applied by the same.

Background

With the development of electronic products and communication technologies, video calls or video conferences are increasingly frequently used. The image capturing device is an indispensable device in video call or video conference. The image capturing device may be a camera with a communication function (for example, a camera of an electronic device such as a mobile phone, a tablet computer, or a notebook computer), or a webcam. In order to facilitate a user to perform a video call or a conference, an image capturing device having an auto-framing function is commercially available. The automatic framing function is that the image capturing device can automatically identify the position of a target object (e.g. a face) in the captured image and automatically adjust the target object to an optimal framing image.

The current automatic view finding method executed by the image capturing device is to perform image recognition in a shooting range, and capture an area containing a target object in a digital zoom mode when the position of the target object in a picture is recognized. That is, the area is enlarged (zoom in) as an optimal view. In addition, the imaging range of the digital zoom system is fixed, and even when an image of an optimal view screen is output, an image can be recognized in a range other than the optimal view screen, which is generally called an auto-tracking function.

However, the digital zooming method has a disadvantage that the image quality of the output image is poor after capturing and enlarging the optimal viewfinder. If the optimum view-finding screen is enlarged by using the optical zoom method, the original image quality can be maintained, but after the image is enlarged, the photographing range is reduced to the optimum view-finding screen. Therefore, the optical zooming method can not determine whether new objects (e.g. faces) enter the shooting range, and the automatic tracking function is lost.

Therefore, how to provide an image capturing device and an automatic view finding method applied by the same, which can enlarge an image by using an optical zoom manner and maintain an automatic tracking function, is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the foregoing, it is a primary object of the present invention to provide an image capturing apparatus and an automatic view finding method, which can solve the problem of enlarging an image by an optical zoom method without an automatic tracking function by setting an action sensing module and controlling an optical zoom lens module to capture images corresponding to different visual fields by a processing module.

In order to achieve the above objective, the present invention provides an image capturing device, which includes an optical zoom lens module, a processing module and a motion sensing module. The optical zoom lens module captures an image corresponding to the first visual field range according to preset parameters. The processing module is electrically connected with the optical zoom lens module. The processing module is provided with an automatic view finding unit, the automatic view finding unit defines a second view field range according to the position of the main object in the image corresponding to the first view field range, and the second view field range is smaller than the first view field range. The processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range. The action sensing module is electrically connected with the processing module. When the motion sensing module detects that the suspected target object enters the first visual field range, a switching signal is transmitted to the processing module. The processing module controls the optical zoom lens module to capture the image corresponding to the third visual field range according to the switching signal.

In order to achieve the above objective, the present invention further provides an automatic view finding method applied to an image capturing device. The image capturing device comprises an optical zoom lens module, a processing module and a motion sensing module. The processing module is electrically connected with the optical zoom lens module and the action sensing module and is provided with an automatic view finding unit. The auto-focusing method comprises the following steps: capturing an image corresponding to the first visual field range by the optical zoom lens module according to preset parameters; the automatic view finding unit of the processing module defines a second visual field range according to the position of the main target object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range; the processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range; when the motion sensing module detects that a suspected target object enters a first visual field range, a switching signal is transmitted to the processing module; and the processing module controls the optical zoom lens module to capture the image corresponding to the third visual field range according to the switching signal.

According to an embodiment of the invention, the predetermined parameter is a minimum magnification or a maximum field of view of the optical zoom lens module.

According to an embodiment of the invention, the processing module includes a face recognition unit that recognizes a main object or a suspected object.

According to an embodiment of the present invention, the third field of view includes a suspected target object.

According to an embodiment of the present invention, the switching signal includes position information of the suspected target. The processing module controls the optical zoom lens module to capture the image corresponding to the third visual field range according to the position information.

According to an embodiment of the invention, the motion sensing module comprises a radar.

In order to achieve the above objective, the present invention further provides an image capturing device, which includes an optical zoom lens module, a processing module and a motion sensing module. The optical zoom lens module captures an image corresponding to the first visual field range according to preset parameters. The processing module is electrically connected with the optical zoom lens module. The processing module has an automatic viewfinder unit. The automatic view finding unit defines a second visual field range according to the position of the main target object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range. The processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range. The action sensing module is electrically connected with the processing module. When the motion sensing module detects that the suspected target object enters the first visual field range, a switching signal is transmitted to the processing module. The processing module controls the optical zoom lens module to capture the image corresponding to the first visual field range according to the switching signal.

In order to achieve the above objective, the present invention further provides an automatic view finding method applied to an image capturing device. The image capturing device comprises an optical zoom lens module, a processing module and a motion sensing module. The processing module is electrically connected with the optical zoom lens module and the action sensing module and is provided with an automatic view finding unit. The auto-focusing method comprises the following steps: capturing an image corresponding to the first visual field range by the optical zoom lens module according to preset parameters; the automatic view finding unit of the processing module defines a second visual field range according to the position of the main target object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range; the processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range; when the motion sensing module detects that a suspected target object enters a first visual field range, a switching signal is transmitted to the processing module; and the processing module controls the optical zoom lens module to capture the image corresponding to the first visual field range according to the switching signal.

According to an embodiment of the invention, the predetermined parameter is a minimum magnification of the optical zoom lens module or a maximum field of view.

According to an embodiment of the invention, the processing module includes a face recognition unit that recognizes a main object or a suspected object.

According to an embodiment of the invention, the processing module controls the optical zoom lens module to capture the image corresponding to the first visual field according to the switching signal, and the automatic view finding unit redefines the second visual field according to the positions of the main object and the suspected object in the image corresponding to the first visual field.

According to an embodiment of the invention, the motion sensing module comprises a radar or an infrared sensor.

In the foregoing, according to the image capturing device and the automatic view finding method of the present invention, the image capturing device includes an optical zoom lens module, a processing module and a motion sensing module. The optical zoom lens module can capture an image corresponding to the first visual field range according to preset parameters. The automatic view finding unit of the processing module defines a second visual field range according to the position of the main object in the image corresponding to the first visual field range, and the optical zoom lens module captures the image corresponding to the second visual field range. Meanwhile, the first visual field range is continuously detected through the action sensing module. When a new object (i.e., a suspected object) is detected to enter the first visual field, the processing module may control the optical zoom lens module to capture an image corresponding to the first visual field or capture an image corresponding to a third visual field (including the suspected object). In other words, the optical zoom lens module returns to a preset image corresponding to the first field of view, or captures an image containing a suspected object (i.e. the third field of view), so as to achieve the function of automatic tracking.

Drawings

Fig. 1 is a block diagram of an image capturing device according to an embodiment of the invention.

Fig. 2 is a flowchart of an automatic framing method according to an embodiment of the invention.

Fig. 3a to 3d are schematic views of the automatic framing method shown in fig. 2.

Fig. 4a to 4d are schematic diagrams illustrating another embodiment of the automatic framing method shown in fig. 2.

Fig. 5 is a flowchart of an automatic framing method according to another embodiment of the present invention.

Fig. 6a to 6d are schematic diagrams of the automatic framing method shown in fig. 5.

The reference numerals are explained as follows:

1 image capturing device 10 optical zoom lens module

20 processing module 21 face recognition unit

22 automatic viewfinder unit 30 motion sensing module

FOV1 first FOV2 second FOV

FOV3, FOV3' third field of view range T1 main object

T2 suspected target S10-S60 steps

Detailed Description

In order to better understand the technical content of the present invention, specific preferred embodiments are described below.

Fig. 1 is a block diagram of an image capturing device according to an embodiment of the invention, and fig. 2 is a flowchart of an automatic framing method according to an embodiment of the invention, please refer to fig. 1 and 2. In this embodiment, the image capturing apparatus 1 includes an optical zoom lens module 10, a processing module 20 and a motion sensing module 30. The image capturing apparatus 1 executes the auto-framing method shown in fig. 2. Preferably, the image capturing device 1 of the present embodiment may be the image capturing device 1 disposed in an electronic device such as a notebook computer, a tablet computer or a mobile phone. In other embodiments, the image capturing device 1 may be a camera, a video camera, or the like. In other embodiments, the image capturing device 1 may also be the image capturing device 1 provided in, for example, a monitoring device or a smart doorbell. The optical zoom lens module 10 may include an optical zoom lens, an Image sensor (Image sensor), etc. for photographing or recording. The optical zoom lens can utilize the relative positions of the convex lens and the concave lens in the optical zoom lens to achieve the zooming function. The image sensor may be a photosensitive coupling device (charge coupled device, CCD) or a complementary metal oxide semiconductor (complementary metal-oxide semiconductor, CMOS). The image sensor can convert the optical signal into an analog electrical signal to output an image within a captured field of view (or shooting range).

In the present embodiment, the processing module 20 may be, for example, but not limited to, a digital signal processor (Digital Signal Processor, abbreviated as DSP), or a central processing unit (Central Processing Unit, CPU). In this embodiment, the processing module 20 may be a processor of the aforementioned electronic device. The processing module 20 is electrically connected to the optical zoom lens module 10, receives images corresponding to the field of view from the optical zoom lens module 10, and controls the optical zoom lens module 10 to capture images corresponding to different field of view, as will be described in detail below.

The motion sensing module 30 of the present embodiment is used for detecting whether a moving object or animal enters the sensing area. The motion sensing module 30 may be, for example, but not limited to, radar (radar), or an infrared sensor (infra-red sensor). The motion sensing module 30 is also electrically connected to the processing module 20. The processing module 20 can adjust the view range captured by the optical zoom lens module 10 according to the detection result of the motion sensing module 30, and details are the same as described in detail below.

It should be noted that, in addition to the above-mentioned modules being configured as hardware devices, software programs, firmware, or a combination thereof, the modules may be configured by circuit loops or other suitable types, and the connections between the modules may be connected to each other in a wired or wireless manner for receiving and transmitting data; further, the respective modules may be arranged in a combination manner, in addition to being arranged in a single manner. In addition, this embodiment is merely an example of the present invention, and all possible variations and combinations are not described in detail for avoiding redundant description. However, it will be appreciated by those of ordinary skill in the art that the various modules or elements described above are not necessarily all necessary. Also, other well-known modules or elements may be included in more detail in order to practice the invention. Each module or element may be omitted or modified as desired, and no other module or element may be present between any two modules.

The following describes how the processing module 20 adjusts the view range captured by the optical zoom lens module 10 to achieve the auto-framing function according to the step flow of the auto-framing method shown in fig. 2. Fig. 3a to 3d are schematic views of the automatic view finding method shown in fig. 2, please refer to fig. 1, 2 and 3a to 3 d.

Step S10: the optical zoom lens module 10 captures an image corresponding to the first field of view FOV1 according to a predetermined parameter.

In the present embodiment, the field of view range preset by the optical zoom lens module 10 and initially captured is referred to as a first field of view FOV1. The optical zoom lens module 10 may be preset to capture a maximum range that the optical zoom lens can capture, i.e., a maximum photographing range, as shown in fig. 3 a. Accordingly, the preset parameter may be a minimum magnification of the optical zoom lens module 10, or a maximum field of view.

In the present embodiment, the image capturing apparatus 1 is disposed in an electronic device, and the usage situation thereof is, for example, video call or video conference. When the user turns on the image capturing device 1, the optical zoom lens module 10 captures an image corresponding to the first field of view FOV1 according to the preset parameters, that is, captures an image with a maximum photographing range. The image corresponding to the first field of view FOV1 includes at least one human image or at least one human face.

Step S20: the automatic view finder unit 22 of the processing module 20 defines a second field of view FOV2 according to the position of the main object T1 in the image corresponding to the first field of view FOV1.

The processing module 20 receives an image corresponding to the maximum photographing range (i.e. the first field FOV 1) captured by the optical zoom lens module 10, and then performs image recognition. For example, the processing module 20 can first identify whether the image has a portrait feature or a face feature, and define it as the main target T1. In the present embodiment, the usage situation of the image capturing apparatus 1 is a video call or a video conference. Preferably, the processing module 20 may have a face recognition unit 21 for recognizing whether the image corresponding to the first field of view FOV1 has a face feature, and defining at least one object having the face feature as the main target T1. In other words, the main target T1 may include at least one face feature. For example, when a face feature is included in the image corresponding to the first field of view FOV1, the face feature may be defined as the main target T1. When the image corresponding to the first field of view FOV1 has a plurality of face features, the face features may be defined as the main target T1, in other words, the image corresponding to the first field of view FOV1 may include a plurality of main targets T1.

In addition, the processing module 20 further has an automatic view finding unit 22, which can define the second field of view FOV2 according to the position of the main target T1 in the image corresponding to the first field of view FOV1. In other words, the automatic view unit 22 defines the area including the main object T1 as the second field of view FOV2, and the second field of view FOV2 is smaller than the first field of view FOV1. For example, when a face feature is included in the image corresponding to the first field of view FOV1, the face feature may be defined as the main target T1. In the present embodiment, the automatic view unit 22 can define the region including the face feature and part of the portrait as the second field FOV2, so as to conform to the use situation of the video call or the video conference, such as the second field FOV2 of the dashed frame in fig. 3 a.

In an embodiment of the present invention, the image corresponding to the first field of view FOV1 may include a plurality of main targets T1. The second field of view FOV2 defined by the auto-viewfinder 22 may include the main objects T1.

It should be noted that the main target T1 may be defined according to the situation or the requirement of the image capturing device 1. As described above, the usage scenario of the present embodiment is video call or video conference, so the face features can be defined as the main target T1. In other embodiments, the image capturing device 1 may be a smart doorbell or an environmental monitoring device, and the use situation thereof is home security monitoring. The image corresponding to the first field of view FOV1 includes a human body or other animal. The processing module 20 may have an identification unit for identifying whether the image corresponding to the first field of view FOV1 has a human body or other animals, and defining the human body or other animals as the main target T1.

Step S30: the optical zoom lens module 10 captures an image corresponding to the second field of view FOV2.

Next, the processing module 20 controls the optical zoom lens module 10 to focus the optical zoom lens to the second field of view FOV2, so as to capture an image corresponding to the second field of view FOV2, as shown in fig. 3 b. Specifically, the range captured by the optical zoom lens module 10 can be reduced to the second field of view FOV2 by enlarging the magnification of the optical zoom lens. It should be noted that fig. 3b may also be a schematic diagram of the electronic device displaying the second field of view FOV2. In this embodiment, when the user performs a video call or a video conference, the electronic device may display an image corresponding to the second field of view FOV2, as shown in fig. 3 b.

Step S40: the motion sensing module 30 detects whether the first field of view FOV1 has the suspected target T2.

The sensing region of the motion sensing module 30 of the present embodiment may be set to a region overlapping the first field of view FOV1. In other words, the motion sensing module 30 can detect whether other moving objects, human bodies or other animal bodies exist in the first field of view FOV1, which is referred to as a suspected target T2 in this embodiment. In this embodiment, the motion sensing module 30 may include a radar, or an infrared sensor. The radar can be used for detecting whether other moving objects exist in the sensing area. The infrared sensor may be a passive infrared sensor (passive infrared sensing module) that receives or measures infrared radiant energy emitted or reflected by objects in the sensing area, and thus may be used to detect the presence of other human or animal bodies entering the sensing area.

Therefore, while the optical zoom lens module 10 captures the image corresponding to the second field of view FOV2, for example, the user can still continuously detect the area of the first field of view FOV1 through the motion sensing module 30 while performing a video call or a video conference, so as to confirm whether a new moving object, a human body or an animal body enters the first field of view FOV1. In other words, when the moving object, the human body or the animal is present in the area outside the second field of view FOV2 and within the first field of view FOV1, as shown in fig. 3c, the motion sensing module 30 can determine that the suspected object T2 enters the first field of view FOV1. Next, step S41 is performed. Otherwise, when the motion sensing module 30 determines that the suspected target T2 does not enter the first field of view FOV1, step S30 is continuously performed to continue the video call or the video conference.

Step S41: the motion sensing module 30 transmits a switching signal to the processing module 20.

In this embodiment, when the motion sensing module 30 detects that the suspected target T2 enters the first field of view FOV1, a switching signal is transmitted to the processing module 20. The processing module 20 can control the optical zoom lens module 10 to adjust the zoom parameter to zoom out the lens and expand the field of view based on the switching signal, so that the expanded field of view (or temporary field of view) includes the main target T1 and the suspected target T2, and captures an image corresponding to the expanded field of view.

In one embodiment, the switching signal may include information about the suspected target T2, such as the position, orientation, distance, or number of the suspected targets T2.

In an embodiment, the processing module 20 can control the optical zoom lens module 10 to adjust to the set parameters based on the switching signal to expand the field of view.

Step S50: the processing module 20 controls the optical zoom lens module 10 to capture an image corresponding to the third field of view FOV3 according to the switching signal, wherein the image corresponding to the third field of view FOV3 includes the main target T1 and the suspected target T2.

In the present embodiment, the processing module 20 adjusts the optical zoom lens module 10 according to the switching signal to make the magnification of the optical zoom lens smaller, so as to control the optical zoom lens module 10 to capture the image corresponding to the third field of view FOV3 (i.e. the temporary field of view), as shown in fig. 3d, wherein the third field of view FOV3 is larger than the second field of view FOV2 and smaller than the first field of view FOV1. As shown in fig. 3d, at this time, the image corresponding to the third field FOV3 includes the main target T1 and the suspected target T2.

In other words, the image capturing device 1 can continuously detect the region of the first field of view FOV1 through the motion sensing module 30 while the optical zoom lens module 10 captures the image corresponding to the second field of view FOV2 for monitoring, video call or video conference. If a new object (i.e., the suspected object T2) enters the range of the first field of view FOV1, the optical zoom lens module 10 zooms and captures an image corresponding to a larger field of view, so as to achieve the function of tracking the new object.

Step S60: the auto-viewfinder unit 22 redefines the second field of view FOV2 according to the position of the main object T1 or the suspected object T2 in the image corresponding to the third field of view FOV 3.

Preferably, the processing module 20 of the present embodiment may recalculate the image of the third field of view FOV3 captured by the optical zoom lens module 10 (step S50). Specifically, the processing module 20 can perform image recognition on the image of the third field of view FOV3, and find the target object from the image of the third field of view FOV3, so as to redefine the second field of view FOV2, so that the updated second field of view FOV2 includes the target object.

For example, if the usage situation of the image capturing apparatus 1 in the present embodiment is doorbell monitoring, video call, or video conference, the face recognition unit 21 of the processing module 20 can recognize whether the suspected target T2 in the image includes at least one face feature. If any, the suspected target T2 may be a visit, or another person participating in a video call or video conference, so the redefined second field of view FOV2 may include the main target T1 and the suspected target T2. Otherwise, if the suspected object T2 does not have the face feature, it indicates that the suspected object T2 may be another animal or a moving object, and the redefined second field of view FOV2 may return to include only the main object T1.

Specifically, the automatic viewfinder unit 22 of the processing module 20 may redefine the second field of view FOV2 according to the position of the main target T1 or the suspected target T2 in the image corresponding to the first field of view FOV1. In one embodiment, if the suspected object T2 includes a face feature, the automatic view finder 22 redefines the area including the main object T1 and the suspected object T2 as the second field of view FOV2. In another embodiment, if the suspected object T2 does not have the face feature, the automatic view finder unit 22 redefines the area including the main object T1 as the second field of view FOV2.

In general, while the video call or the video conference is being conducted (i.e., step S30), the region of the first field of view FOV1 is continuously detected by the motion sensing module 30 (step S40). If a new object (i.e., the suspected object T2) enters the range of the first field FOV1 (step S41), the optical zoom lens module 10 enlarges and captures an image corresponding to the third field FOV3, which includes the main object T1 and the suspected object T2 (step S50), and the auto-view unit 22 redefines the second field FOV2 according to the position of the main object T1 or the suspected object T2 to include the desired object. In other words, during the video call or the video conference, if a new object (i.e. the suspected object T2) enters the area outside the second field of view FOV2, the optical zoom lens module 10 can still automatically enlarge and capture the image including the main object T1 and the suspected object T2 (i.e. the third field of view FOV 3), so as to achieve the function of automatic tracking, without the need of the user to adjust the shot image.

Fig. 4a to 4d are schematic diagrams of another embodiment of the automatic view finding method shown in fig. 2, please refer to fig. 1, 2 and 4a to 4 d. As described above, the automatic framing method of the present embodiment also includes: the optical zoom lens module 10 captures an image corresponding to the first field of view FOV1 according to a preset parameter (step S10); the automatic view finder unit 22 of the processing module 20 defines a second field of view FOV2 according to the position of the main object T1 in the image corresponding to the first field of view FOV1 (step S20), as shown in fig. 4 a; the processing module 20 controls the optical zoom lens module 10 to capture an image corresponding to the second field of view FOV2 (step S30), as shown in fig. 4 b; the motion sensing module 30 detects whether the first field of view FOV1 has a suspected target T2 (step S40); if yes, send a switching signal to the processing module 20 (step S41), and the switching signal includes the position information of the suspected target T2; the processing module 20 controls the optical zoom lens module 10 to capture an image corresponding to the third field of view FOV3' according to the position information (step S50). The difference from the foregoing embodiment is that the third field of view FOV3' is a region mainly covering the suspected target T2, and does not necessarily include the main target T1.

In step S40, if the motion sensing module 30 determines that the suspected target T2 is located outside the second field of view FOV2, as shown in fig. 4 c. Then, the motion sensing module 30 can also transmit the switching signal to the processing module 20. As described above, the switching signal may include information related to the suspected target T2, such as the position, orientation, distance or number of the suspected target T2. In this embodiment, the switching signal includes the position information of the suspected target T2, so that the third field of view FOV3' is mainly the area covering the suspected target T2.

Specifically, the motion sensing module 30 of the present embodiment may be a radar. The radar can detect the moving object in the sensing area and further acquire the position information of the moving object. In step S40, when the motion sensing module 30 detects that the moving object (i.e. the suspected target object T2) enters the sensing region (i.e. the first field of view FOV 1), step S41 is performed. The motion sensing module 30 transmits a switching signal containing the position information of the suspected target T2 to the processing module 20. In step S50, the processing module 20 controls the optical zoom lens module 10 to capture an image corresponding to the third field of view FOV3' according to the position information of the suspected target T2, as shown in fig. 4 d. The third field of view FOV3' includes the suspected target T2, so as to achieve the function of automatic tracking. Next, in step S60, the processing module 20 also re-calculates the image of the third field of view FOV3' captured by the optical zoom lens module 10 to re-adjust the optical zoom lens module 10. For example, the automatic view finder 22 of the processing module 20 redefines the second field of view FOV2 according to the position of the suspected object T2 in the image corresponding to the third field of view FOV 3. The redefined second field of view FOV2 may refocus the suspected target T2 or readjust the shooting angle. For example, the suspected object T2 is placed in the second field of view FOV2.

In the present embodiment, while the video call or the video conference is being performed (i.e. step S30), the motion sensing module 30 also continuously detects the region of the first field of view FOV1 (step S40). If a new object (i.e., the suspected object T2) enters the range of the first field FOV1, the processing module 20 may control the optical zoom lens module 10 to capture an image corresponding to the third field FOV3' including the new object according to the position information in the switching signal (step S50). In short, in the process of the video call or the video conference, if a new object (i.e. the suspected object T2) enters the area outside the second field of view FOV2, the optical zoom lens module 10 can automatically capture the image of the suspected object T2 (i.e. the third field of view FOV 3), so as to achieve the function of automatic tracking, without the user having to adjust the shot image by himself.

Fig. 5 is a flowchart of an automatic view finding method according to another embodiment of the present invention, and fig. 6a to 6d are schematic diagrams of the automatic view finding method shown in fig. 5, please refer to fig. 1, 5 and 6a to 6 d. As described above, the automatic framing method of the present embodiment includes: the optical zoom lens module 10 captures an image corresponding to the first field of view FOV1 according to a preset parameter (step S10); the automatic view finder unit 22 of the processing module 20 defines a second field of view FOV2 according to the position of the main object T1 in the image corresponding to the first field of view FOV1 (step S20), as shown in fig. 6 a; the optical zoom lens module 10 captures an image corresponding to the second field of view FOV2 (step S30), as shown in fig. 6 b; the motion sensing module 30 detects whether the first field of view FOV1 has the suspected target T2 (step S40). If yes, the motion sensing module 30 transmits a switching signal to the processing module 20 (step S41), and returns to step S10. If not, return to step S30. Therefore, steps S10 to S41 of the automatic view finding method of the present embodiment are the same as those of the previous embodiment, and reference is directly made to the previous embodiment, and the description thereof is omitted.

In the present embodiment, when the motion sensing module 30 determines that the suspected target T2 is located within the first field of view FOV1 and outside the second field of view FOV2, as shown in fig. 6c, the processing module 20 returns to step S10 according to the switching signal after the motion sensing module 30 transmits the switching signal. At this time, the optical zoom lens of the optical zoom lens module 10 zooms in to the initial setting, that is, captures an image corresponding to the first field of view FOV1 according to the preset parameters, as shown in fig. 6 d. The auto-viewfinder 22 uses the same operations to determine and define the main object T1 within the first field FOV1, which may include one or more face features, and redefine the second field FOV2.

In the present embodiment, the processing module 20 controls the optical zoom lens module 10 to capture the image corresponding to the first field of view FOV1 according to the switching signal, as shown in fig. 6 d. That is, the processing module 20 returns to the preset state according to the switching signal, and the processing module 20 controls the optical zoom lens module 10 to capture the maximum range that the optical zoom lens can capture (step S10). As shown in fig. 6d, at this time, the image corresponding to the first field FOV1 includes the main target T1 and the suspected target T2.

On the contrary, in step S40, if the motion sensing module 30 determines that the suspected object T2 does not enter the first field of view FOV1, step S30 is continuously performed to continuously capture the corresponding image with the focal length parameter of the original second field of view FOV2.

In general, while the video call or the video conference is being conducted (i.e., step S30), the region of the first field of view FOV1 is continuously detected by the motion sensing module 30 (step S40). If a new object (i.e. the suspected object T2) enters the range of the first field of view FOV1, the optical zoom lens module 10 returns to capturing the image corresponding to the first field of view FOV1 (step S10), and the automatic viewfinder unit 22 redefines the second field of view FOV2 in the same manner as the above embodiment, so that the main object T1 in the second field of view FOV2 includes one or more face features, and may cover the face features of the new object. In other words, during the video call or the video conference, if a new object (i.e. the suspected object T2) enters the area outside the second field of view FOV2, the optical zoom lens module 10 can automatically capture the image including the main object T1 and the suspected object T2 (i.e. the second field of view FOV 2), so as to achieve the function of automatic tracking, without the need of the user to adjust the shot image.

In summary, according to the image capturing device and the automatic view finding method of the present invention, the image capturing device includes an optical zoom lens module, a processing module and a motion sensing module. The optical zoom lens module can capture an image corresponding to the first visual field range according to preset parameters. The automatic view finding unit of the processing module defines a second visual field range according to the position of the main object in the image corresponding to the first visual field range, and the optical zoom lens module captures the image corresponding to the second visual field range. Meanwhile, the first visual field range is continuously detected through the action sensing module. When a new object (i.e., a suspected object) is detected to enter the first visual field, the processing module may control the optical zoom lens module to capture an image corresponding to the first visual field or capture an image corresponding to a third visual field (including the suspected object). In other words, the optical zoom lens module returns to a preset image corresponding to the first field of view, or captures an image containing a suspected object (i.e. the third field of view), so as to achieve the function of automatic tracking.

It should be noted that the above-mentioned embodiments are presented for the purpose of illustration and that the scope of the invention claimed should be defined by the claims rather than by the above-mentioned embodiments.

Claims (20)

1. An image capturing device, comprising:

the optical zoom lens module captures an image corresponding to the first visual field range according to preset parameters;

the processing module is electrically connected with the optical zoom lens module and is provided with an automatic view finding unit, the automatic view finding unit defines a second visual field range according to the position of a main target object in the image corresponding to the first visual field range, the second visual field range is smaller than the first visual field range, and the processing module controls the optical zoom lens module to capture the image corresponding to the second visual field range; and

the motion sensing module is electrically connected with the processing module, and when the motion sensing module detects that a suspected target object enters the first visual field range, the motion sensing module transmits a switching signal to the processing module, and the processing module controls the optical zoom lens module to capture an image corresponding to a third visual field range according to the switching signal.

2. The image capturing device of claim 1, wherein the predetermined parameter is a minimum magnification or a maximum field of view of the optical zoom lens module.

3. The image capturing device of claim 1, wherein the processing module comprises a face recognition unit that recognizes the primary object or the suspected object.

4. The image capturing device of claim 1, wherein the third field of view comprises the suspected target.

5. The image capturing device according to claim 1, wherein the switching signal includes position information of the suspected object, and the processing module controls the optical zoom lens module to capture an image corresponding to the third field of view according to the position information.

6. The image capture device of claim 1, wherein the motion sensing module comprises a radar.

7. An automatic view finding method is applied to an image capturing device, and is characterized in that the image capturing device comprises an optical zoom lens module, a processing module and a motion sensing module, wherein the processing module is electrically connected with the optical zoom lens module and the motion sensing module, and is provided with an automatic view finding unit, and the automatic focusing method comprises the following steps:

the optical zoom lens module captures an image corresponding to a first visual field range according to preset parameters;

the automatic view finding unit of the processing module defines a second visual field range according to the position of the main target object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range;

the processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range;

when the motion sensing module detects that a suspected target object enters the first visual field range, a switching signal is transmitted to the processing module; and

the processing module controls the optical zoom lens module to capture an image corresponding to a third visual field range according to the switching signal.

8. The automatic view finding method as claimed in claim 7, wherein the preset parameter is a minimum magnification or a maximum visual field range of the optical zoom lens module.

9. The automatic framing method according to claim 7, wherein the processing module includes a face recognition unit that recognizes the main object or the suspected object.

10. The automatic view finding method as claimed in claim 7, wherein the third visual field range includes the suspected object.

11. The method according to claim 7, wherein the switching signal includes position information of the suspected object, and the processing module controls the optical zoom lens module to capture an image corresponding to the third field of view according to the position information.

12. An image capturing device, comprising:

the optical zoom lens module captures an image corresponding to the first visual field range according to preset parameters;

the processing module is electrically connected with the optical zoom lens module and is provided with an automatic view finding unit, the automatic view finding unit defines a second visual field range according to the position of a main target object in the image corresponding to the first visual field range, the second visual field range is smaller than the first visual field range, and the processing module controls the optical zoom lens module to capture the image corresponding to the second visual field range; and

the motion sensing module is electrically connected with the processing module, and when the motion sensing module detects that a suspected target object enters the first visual field range, the motion sensing module transmits a switching signal to the processing module, and the processing module controls the optical zoom lens module to capture an image corresponding to the first visual field range according to the switching signal.

13. The image capturing device of claim 12, wherein the predetermined parameter is a minimum magnification or a maximum field of view of the optical zoom lens module.

14. The image capturing device of claim 12, wherein the processing module comprises a face recognition unit to identify the primary object or the suspected object.

15. The image capturing device according to claim 12, wherein the processing module controls the optical zoom lens module to capture the image corresponding to the first field of view according to the switching signal, and the automatic view finding unit redefines the second field of view according to the positions of the main object and the suspected object in the image corresponding to the first field of view.

16. The image capturing device of claim 12, wherein the motion sensing module comprises a radar or an infrared sensor.

17. An automatic view finding method is applied to an image capturing device, and is characterized in that the image capturing device comprises an optical zoom lens module, a processing module and a motion sensing module, wherein the processing module is electrically connected with the optical zoom lens module and the motion sensing module, and is provided with an automatic view finding unit, and the automatic focusing method comprises the following steps:

the optical zoom lens module captures an image corresponding to a first visual field range according to preset parameters;

the automatic view finding unit of the processing module defines a second visual field range according to the position of the main target object in the image corresponding to the first visual field range, and the second visual field range is smaller than the first visual field range;

the processing module controls the optical zoom lens module to capture an image corresponding to the second visual field range;

when the motion sensing module detects that a suspected target object enters the first visual field range, a switching signal is transmitted to the processing module; and

the processing module controls the optical zoom lens module to capture the image corresponding to the first visual field range according to the switching signal.

18. The automatic view finding method as claimed in claim 17, wherein the preset parameter is a minimum magnification or a maximum visual field range of the optical zoom lens module.

19. The automatic framing method according to claim 17, wherein the processing module includes a face recognition unit that recognizes the main object or the suspected object.

20. The automatic framing method according to claim 17, further comprising the step of:

and the automatic view finding unit redefines the second visual field range according to the positions of the main target object and the suspected target object in the image corresponding to the first visual field range.