TW201410201A - Image detecting apparatus and image detecting method - Google Patents

Abstract

An image detecting apparatus for detecting an object including a light source, a light mask, a lens module, a image detecting unit and a control unit is provided. The light source provides an illumination beam. The light mask is disposed on the transmission path of the illumination beam and has a light transmissive aperture. The illumination beam propagates through the light mask via the light transmissive aperture. The lens module is disposed on the transmission path of the illumination beam from the light transmissive aperture. The object reflects the illumination beam into an image beam. The lens module is disposed on the transmission path of the image beam. The image detecting unit is disposed on the transmission path of the image beam from the lens module. The control unit makes the image detecting unit and the light mask move according to the shift condition of the image detected by the image detecting unit. An image detecting method is also provided.

Description

Image detecting device and image detecting method

The present invention relates to a detection apparatus and a detection method, and more particularly to an image detection apparatus and an image detection method.

In recent years, under the continuous advancement of semiconductor technology and process, complementary metal-oxide-semiconductor sensor (CMOS sensor) and charge coupled device (CCD) image sensing The device is reduced in size, cost, and power consumption, and thus is widely used in portable products such as a handheld digital camera or a smart phone. However, since the image sensing device on the portable device often blurs the image due to slight shaking or movement of the user, the difficulty of the user is increased.

In the application of medical instruments, for example, in a physiological image capturing device such as a retina or a fundus camera, even a small vibration greatly affects the imaging range of the optical system because the small pupil is aligned through the narrow pupil. It can cause blurred images and reduce image quality. As a result, it is often difficult for a physician to judge the condition based on the wrong imaging range and blurred images. In order to obtain a clear image for the physician to determine the physiological condition, the image sensing device is usually mounted on a fixed table, and the image sensing device is manually adjusted by the medical staff to correct the patient's pupil position and then focus on The retina is photographed. In this way, take a picture of the retina of the fundus Photographs can take a lot of time and can also cause the patient's eyes to become more tired. Even for patients suffering from special diseases such as nystagmus, they are unable to control the eyeball or body tremor, which makes the difficulty and time spent manually shooting the retina much higher, and increases the burden on medical personnel and patients.

The invention provides an image detecting device which can adapt to the movement of the object to be tested, and achieves a good image capturing range and a good image of the object to be tested.

The invention provides an image detecting method, which can adapt to the movement of the object to be tested, and achieve a good image capturing range and a good image of the object to be tested.

An embodiment of the present invention provides an image detecting device for detecting an object to be tested. The image detecting device includes a light source, a light mask, a lens module, an image detecting unit, and a control unit. The light source provides an illumination beam. The light mask is disposed on the transmission path of the illumination beam, and the light mask has a transparent opening, and the illumination beam passes through the light mask through the transparent opening. The lens module is disposed on a transmission path of the illumination beam from the light-transmitting aperture to project the illumination beam onto the object to be tested, and the object to be tested reflects the illumination beam into an image beam. The lens module is disposed on the transmission path of the image beam. The image detecting unit is disposed on the transmission path of the image beam from the lens module, and the lens module images the image of the object to be tested on the image detecting unit. The control unit is electrically connected to the image detecting unit, and moves the image detecting unit and the light mask according to the offset state of the image detected by the image detecting unit.

In an embodiment of the invention, the object to be tested is an eyeball, and The control unit recognizes the pupil image of the eyeball in the image detected by the image detecting unit, determines the position of the pupil image on the image detecting unit, and calculates the offset of the position of the pupil image, and the control unit The image detecting unit and the light mask are moved according to the offset of the pupil image.

In an embodiment of the invention, the control unit first confirms whether the position of the pupil image is in the central area of the image detecting unit, and if not, calculates the offset of the position of the pupil image.

In an embodiment of the present invention, the control unit calculates a first corresponding movement amount of the light mask and a second corresponding movement amount of the image detecting unit according to the offset of the pupil image, and the control unit makes the light mask After the first corresponding movement amount is moved, and the image detecting unit is moved by the second corresponding movement amount, the illumination beam is incident on the pupil of the eyeball, and the image formed by the image detection unit of the eyeball is aligned with the image detection unit.

In an embodiment of the invention, the image detecting device further includes a first actuator and a second actuator. The first actuator is electrically connected to the control unit, and the control unit drives the light mask to move by the first actuator. The second actuator is electrically connected to the control unit, and the control unit drives the image detecting unit to move by the second actuator.

In an embodiment of the invention, the lens module includes a front lens group and a beam splitting unit. The front lens group is disposed on a transmission path of the illumination beam from the light-transmitting aperture, and is disposed on a transmission path of the image beam from the object to be tested. The beam splitting unit is disposed on the transmission path of the illumination beam and the image beam, and the beam splitting unit transmits the illumination beam from the transparent aperture to the front lens group, and transmits the image beam from the object to be tested to the image detection unit.

In an embodiment of the invention, the movement of the image detecting unit and the movement of the light mask are relative to the relative movement of the light source and the lens module.

The present invention provides an image detecting method for detecting an object to be tested. The image detecting method includes the following steps: providing an illumination beam. The illumination light is transmitted to the object to be tested through a light-transmissive opening of a light mask. The image of the object to be tested is imaged on an image detecting unit. The light mask and the image detecting unit are moved according to the offset state of the image of the object to be tested on the image detecting unit.

In an embodiment of the invention, the object to be tested is an eyeball, and the step of moving the light mask and the image detecting unit according to the offset state of the image of the eyeball on the image detecting unit comprises identifying the image detecting unit The pupil image in the detected image, the position of the pupil image on the image detecting unit, the offset of the position of the pupil image, and the movement of the image detecting unit and the light mask according to the offset of the pupil image .

In an embodiment of the invention, the step of moving the light mask and the image detecting unit according to the offset state of the image of the object to be tested on the image detecting unit further includes offsetting the position of the pupil image. Before confirming whether the position of the pupil image is in the central area of the image detection unit, if not, calculate the offset of the position of the pupil image.

In an embodiment of the invention, the step of moving the image detecting unit and the light mask according to the offset of the pupil image comprises calculating a first corresponding movement of the image detecting unit according to the offset of the pupil image And moving the light mask and the image detecting unit respectively by the first corresponding moving amount of the light mask and the first corresponding moving amount and the second corresponding moving amount, so that the illumination beam is incident on the pupil of the eyeball, and the fundus of the eyeball is made Formed by the image detecting unit The image is aligned with the image detection unit.

In an embodiment of the invention, the method for imaging an image of the object to be tested on the image detecting unit comprises imaging the image of the object to be imaged on the image detecting unit by using a lens module. Moreover, the method for moving the light mask and the image detecting unit according to the offset state of the image of the eyeball on the image detecting unit comprises moving the light mask relative to the lens module and moving the image detecting unit relative to the lens module.

Based on the above, in the image detecting device and the image detecting method of the embodiment of the present invention, the image detecting unit and the light are blocked according to the state of the image shift of the object to be detected detected by the image sensing unit. The cover moves, so the image detecting device and the image detecting method can be adapted to the movement of the object to be tested to obtain a good image capturing range and image quality.

The above described features and advantages of the present invention will be more apparent from the following description.

1 is a schematic diagram of an image detecting apparatus according to an embodiment of the present invention. 2 is a detailed schematic view of a light mask in accordance with the embodiment of FIG. 1. Please refer to Figure 1 first. In this embodiment, the image detecting device 10 is configured to detect an object to be tested 20. In the present embodiment, the object to be tested 20 is, for example, an eyeball. However, in other embodiments, the object to be tested 20 may be any object that can be detected by the optical system of the image detecting device 10. The image detecting device 10 includes a light source 100, a light mask 110, a lens module 120, an image detecting unit 130, and a control unit 140. The light source 100 can be a visible light source, and An illumination beam L is provided. Alternatively, in other embodiments, the light source 100 can also be a source of invisible light, such as a light source for providing an infrared beam. The light mask 110 is disposed on the transmission path of the illumination light beam L. Referring to FIG. 1 and FIG. 2 , the light mask 110 has a light-transmissive opening 111 through which the illumination light beam L passes through the light-shielding opening 111 . In this embodiment, the light-transmissive opening 111 can be, for example, an annular opening, and the illumination beam L can form an annular illumination beam through the annular opening. Among them, the annular illumination beam can avoid the concentrated reflection light in the fundus, and can uniformly illuminate the retina R located at the fundus through the pupil PL, thereby increasing the image quality. However, in other embodiments, the light-transmissive opening 111 may have a different shape according to the type and shape of the object to be tested 20, and the invention is not limited thereto.

In the embodiment, the lens module 120 is disposed on the transmission path of the illumination light beam L from the light-transmissive opening 111 to project the illumination light beam L to the object to be tested 20 . The object to be tested 20 reflects the illumination beam L into an image beam B. The lens module 120 is disposed on the transmission path of the image beam B. The lens module 120 can include a front lens group 122 and a light splitting unit 124. The front lens group 122 is disposed on the transmission path of the illumination light beam L from the light-transmitting aperture 111, and is disposed on the transmission path of the image light beam B from the object 20 to be tested. The light splitting unit 124 is disposed on a transmission path of the illumination light beam L and the image light beam B. In the present embodiment, the beam splitting unit 124 is a beam splitter, that is, a partially penetrating partial mirror, such as a transflective mirror. However, in other embodiments, the beam splitting unit 124 can also be a polarizing beam splitter (PBS) or other type of beam splitter. The light splitting unit 124 transmits the illumination light beam L from the light transmission opening 111 The image lens B from the object to be tested 20 is transmitted to the image detecting unit 130.

In the embodiment, the lens module 120 further includes a first rear lens group 126 disposed on the transmission path of the illumination light beam L and located between the light transmission opening 111 and the light splitting unit 124. In addition, according to actual needs, the lens module 120 can include a reflector 129 disposed between the first rear lens group 126 and the light transmission opening 111, and reflect the illumination light beam L from the light transmission opening 111 to the light splitting. The unit 124 transmits the illumination light beam L to the spectroscopic unit 124 via the first rear lens group 126, for example. However, in other embodiments, the lens module 120 may not be provided with the reflector 129, and the illumination light beam L from the light-transmissive opening 111 faces the beam splitting unit 124. Alternatively, the first rear lens group 126 may be disposed between the reflector 129 and the light transmission opening 111. The reflector 129 is, for example, a mirror or a reflection 稜鏡.

In this embodiment, the lens module 120 further includes a second rear lens group 128 disposed on the transmission path of the image beam B and located between the beam splitting unit 124 and the image detecting unit 130. In addition, each lens group may include one lens or a plurality of lenses, and in FIG. 1, a single lens is taken as an example. Furthermore, in the present embodiment, the beam splitting unit 124 reflects at least part of the illumination light beam L from the light-transmissive opening 111 to the front lens group 122, and at least part of the image light beam B from the front lens group 122 penetrates the light splitting unit 124. Passed to the image detecting unit 130. However, in other embodiments, at least part of the illumination light beam L from the light-transmissive opening 111 may pass through the beam splitting unit 124 and be transmitted to the front lens group 122, and the light splitting unit 124 will at least partially image the light beam from the front lens group 122. B is reflected to the image detecting unit 130.

When the pupil PL of the eyeball 20 is at the position 200, the illumination beam L0 emitted by the light source 100 can pass through the light mask 110 at the position F0, and the split light is transmitted to the eyeball 20 through the splitting unit 124 and transmitted to the fundus of the eyeball 20 through the front lens group 122. . The image beam B0 of the fundus can be further transmitted through the front lens group 122 to the position 1300 of the image sensing unit 130. The image detecting unit 130 is disposed on the transmission path of the image beam B from the lens module 120. The lens module 120 images the image of the object 20 to be imaged by the image detecting unit 130 at the position P0. The image detecting unit 130 can be, for example, a charge coupled device (CCD) or a complementary metal-oxide-semiconductor sensor (CMOS Sensor), which can detect the object to be tested. 20 image beam B. In the present embodiment, the structure and arrangement of the lens module 120 are for illustrative purposes only, and the present invention is not limited thereto.

In this embodiment, the control unit 140 is electrically connected to the image detecting unit 130, and moves the image detecting unit 130 and the light mask 110 according to the offset state of the image detected by the image detecting unit 130. The control unit 140 is, for example, a processor or a control chip. The movement of the image detecting unit 130 and the movement of the light mask 110 may be relative movements of the light source 100 and the lens module 120. For example, the image detecting unit 130 and the light mask 110 can move inside the image detecting device 10 relative to the entire image detecting device 10. That is, in the embodiment, the control unit 140 can adjust the image detecting unit 130 when the object to be tested 20 is in a moving state by the cooperation of the image detecting unit 130 and the control unit 140. The position of the light mask 110 is adapted to the image beam B of the moving object to be tested 20, thereby reducing the influence of the movement of the object to be tested 20 on the image, thereby obtaining a correct image capturing range and improving image quality.

In this embodiment, the image detecting device 130 further includes a first actuator 131 and a second actuator 132. The first actuator 131 is electrically connected to the control unit 140, and the control unit 140 drives the light mask 110 to move by the first actuator 131. The second actuator 132 is electrically connected to the control unit 140, and the control unit 140 drives the image detecting unit 130 to move by the second actuator 132. In this embodiment, the control unit 140 can identify the pupil image in the image detected by the image detecting unit 130, and can determine the position of the pupil image on the image detecting unit 130, and can calculate the pupil image. The position of the offset, and the control unit 140 can move the image detecting unit 130 and the light mask 110 according to the offset of the pupil image. That is, in the embodiment, the first actuator 131 and the second actuator 132 are controlled by the control unit 140 to adjust the movement of the image detecting unit 130 and the light mask 110 to offset the offset of the pupil PL. And tracking the position of the pupil PL, so that when the lens module 120 focuses on the fundus (such as the retina R), the image of the retina R can be correspondingly imaged on the image detecting unit 130, and there is no cause The image capturing range is incorrect, so that only part of the image of the retina R is imaged on the partial image detecting unit 130, and the other part of the image detecting unit 130 receives the reflected light from tissues other than the pupil PL (for example, the iris). In this way, the problem of incorrect imaging range caused by eye movement can be effectively improved. In addition, since the image of the retina also moves when the eyeball moves, at this time, since the image detecting unit 130 also follows the image The image of the retina moves and moves, so that the image of the retina is close to being in a stationary state with respect to the image detecting unit 130. Therefore, when the image detecting unit 130 performs image capturing, the image of the retina obtained is less blurred.

In detail, in this embodiment, the control unit 140 may first confirm whether the position of the pupil image is in the central area of the image detecting unit 130. If no, the offset of the position of the pupil image is calculated. For example, when the eyeball 20 moves from the position 200 to the position 201, the offset of the position of the pupil image is the offset amount d1, that is, when the distance of the pupil image from the position P0 to the position P1, the control unit 140 according to the pupil image The offset d1 calculates a first corresponding movement amount M1 of the light mask 110 and a second corresponding movement amount J1 of the image detecting unit 130. The control unit 140 moves the light mask 110 by the first corresponding movement amount M1 (that is, the light mask 110 moves from the position F0 to the position F1) and moves the image detecting unit 130 by the second corresponding movement amount J1 (ie, After the image detecting unit 130 moves from the position 1300 to the position 1301, the illumination beam L1 is incident on the eyeball 20, and the image formed by the image detecting unit 130 of the eyeball 20 is aligned with the image detecting unit 130. Or, when the eyeball 20 moves from the position 200 to the position 202, its pupil image is imaged at P2, and the light mask 110 can be aligned to the pupil PL by the corresponding movement to the position F2, and the image detection The measuring unit 130 can be moved to the position 1302 correspondingly so that the image beam B2 can be aligned with the image detecting unit 1302. Therefore, when the pupil PL moves due to the body or the eye, the illumination beam L emitted by the light source 100 can still align with the pupil PL to uniformly illuminate the fundus, and the image of the fundus can still be maintained in the image detecting unit 130, so the image The detecting unit 130 can still obtain a stable and clear fundus image. The moving direction of the light mask 110 and the image detecting unit 130 is only used as an example. The moving direction of the actual light mask 110 and the moving direction of the image detecting unit 130 may correspond to the optical structure of the lens module 120. The invention is not limited thereto.

In the image detecting device 10 of the present embodiment, the image detecting unit 130 and the light mask 110 can be moved relative to the entire image detecting device 10, and the user can move the entire image detecting device 10 without intention to move it. The problem is that the image detecting device 10 of the present embodiment can be used as a hand-held fundus camera, and the hand-held fundus camera technology can be realized to meet the demand.

3 is a flow chart of an image detection method in an embodiment of the present invention. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the image detection method of the present embodiment can be applied to the image detection device 10 of FIG. 1 , but the invention is not limited thereto. In this embodiment, the image detection method includes the following steps. First, an illumination light beam L is provided (step S110), for example, to provide an illumination light beam L using the light source 100. The illumination light L is transmitted to the object to be tested through the light-transmissive opening 111 of the light mask 110 (step S120), for example, the illumination light beam L is transmitted to the object to be tested 20 via the lens module 120. Then, the image of the object to be tested 20 is imaged on an image detecting unit 130 (step S130). For example, the image beam B of the object to be tested 20 is transmitted to the image detecting unit 130 through the lens module 120. Then, the light mask 110 and the image detecting unit 130 are moved according to the offset state of the image of the object 20 to be detected on the image detecting unit 130 (step S140), for example, according to the image shift amount d1 of the object 20 to be tested. Mobile image The measuring unit 130 and the light mask 110. The object to be tested 20 in step S120 can be, for example, an eyeball, and the light-transmissive opening 111 can be an annular opening. In detail, in step S130, the method of imaging the image of the object to be tested 20 onto an image detecting unit 130 may include imaging the image of the object to be tested 20 on the image detecting unit 130 by using a lens module 120. . In the step S140, the method of moving the light mask 110 and the image detecting unit 130 according to the offset state of the image of the object 20 to be tested on the image detecting unit 130 may further include the light mask 110 relative to the lens module. 120 moves and moves the image detecting unit 130 relative to the lens module 120. The moving direction of the light mask 110 relative to the lens module 120 and the moving direction of the image detecting unit 130 relative to the lens module 120 may be, for example, in the same direction or in the opposite direction, depending on the design of the visual lens module 120. For the other steps of the method for operating the image sensing device 130, reference may be made to the description of the image sensing device 10, and the details of the steps are not described herein.

FIG. 4 is a flow chart showing the steps of moving the light mask and the image detecting unit according to the offset state of the image of the object to be tested on the image detecting unit according to the image detecting method in the embodiment of FIG. 3. Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. In this embodiment, the step S140 includes identifying the pupil image in the image detected by the image detecting unit 130 (step S141), determining the position of the pupil image on the image detecting unit 130 (step S142), and calculating the pupil image. The positional offset (step S143) and the image detecting unit 130 and the light mask 110 are moved according to the offset of the pupil image (step S144). In detail, in this embodiment, before the step S142 is performed, it is determined whether the image detecting unit 130 can recognize the image of the pupil PL (step 1411). If not, the process returns to step S141 to re-recognize. If yes, step S142 is performed to determine the position of the pupil image on the image detecting unit 130. Thereby, to increase the accuracy of capturing images. In addition, the step S140 further includes: before calculating the offset of the position of the pupil image, confirming whether the position of the pupil image is in the central area of the image detecting unit 130 (step S1421), and if not, calculating the position of the pupil image. The offset. If YES, the image can be captured on the fundus (step S145). After capturing the image, it is possible to return to step S141 to prepare for subsequent shooting. Thereby, the image detecting unit 130 and the light mask 110 can automatically track the position of the pupil PL and stably introduce light into the fundus through the pupil PL to provide a uniform and stable illumination source of the fundus.

In more detail, as shown in FIG. 5, step S144 further includes calculating a first corresponding movement amount M1 of the light mask 110 and a second corresponding movement amount J1 of the image detecting unit 130 according to the offset of the pupil image. (Step 1441) and moving the light mask 110 and the image detecting unit 130 respectively by the first corresponding movement amount M1 and the second corresponding movement amount J1, so that the illumination light beam L is incident on the pupil PL of the eyeball, and the fundus of the eyeball is imaged. The image formed by the detecting unit 130 is aligned with the image detecting unit 130 (step 1442). For the other steps of the method for operating the image sensing device 130, reference may be made to the description of the image sensing device 10, and the details of the steps are not described herein.

In summary, in the above embodiment of the present invention, the control unit determines the imaging position of the image of the object to be tested on the image detecting unit, and if the imaging position is offset, the control unit (for example, a processor) ) Calculate the test The offset of the image of the object image and the corresponding amount of movement required to control the image detecting unit and the light mask are fed back to the control image detecting unit and the light mask to change the position of the image detecting unit and the light mask. Therefore, the light source can be aligned with the object to be tested (for example, an eyeball) and the image of the object to be tested can be aligned with the image detecting unit. Thereby, the image detecting device can automatically adapt to the vibration or movement of the object to be tested, thereby reducing the influence of the vibration or movement on the image quality, and reducing the time and difficulty of detecting the image, for example, in the application of medical images. Automatically detecting the position of the pupil of the eyeball and automatically focusing on the fundus to save the image can save the time and difficulty of manual focus of the medical staff. The patient can also detect the fundus image at any time by using the automated image detecting device, which can save a lot of medical care. Resources and medical treatment time can obtain good fundus images for further analysis and diagnosis by medical staff, thereby increasing user convenience and diagnostic accuracy.

In addition, in the image detecting method of the above-described embodiment of the present invention, the image detecting unit and the light mask are correspondingly moved according to the state of the image shift of the object to be tested detected by the image sensing unit. The image shifting degree of the object to be tested is reduced, so that the image detecting method can be adapted to the movement of the object to be tested to obtain a good image capturing range and image quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧Image detection device

20‧‧‧Test object

100‧‧‧Light source

110‧‧‧Light mask

111‧‧‧Light opening

120‧‧‧Lens module

122‧‧‧ front lens group

124‧‧‧Distribution unit

126‧‧‧First rear lens group

128‧‧‧Second rear lens group

129‧‧‧ reflector

130‧‧‧Image Detection Unit

131‧‧‧First actuator

132‧‧‧second actuator

140‧‧‧Control unit

B, B0, B1, B2‧‧‧ image beam

D1‧‧‧ offset

J1‧‧‧second corresponding movement amount

L, L0, L1, L2‧‧‧ illumination beam

M1‧‧‧ first corresponding amount of movement

PL‧‧‧ pupil

R‧‧‧Retina

200, 201, 202, 1300, 1301, 1302, F0, F1, F2, P0, P1, P2‧‧‧ position

S110, S120, S130, S140, S141, S1411, S142, S143, S144, S1421, S1441, S1442, S145‧‧ steps

1 is a schematic diagram of an image detecting apparatus according to an embodiment of the present invention.

2 is a detailed schematic view of a light mask in accordance with the embodiment of FIG. 1.

3 is a flow chart of an image detection method in an embodiment of the present invention.

4 is a detailed flowchart of the steps of moving the light mask and the image detecting unit according to the offset state of the image of the object to be tested on the image detecting unit according to the image detecting method in the embodiment of FIG.

5 is a flow chart showing the steps of moving the image detecting unit and the light mask according to the offset of the pupil image in FIG.

10‧‧‧Image detection device

20‧‧‧Test object

100‧‧‧Light source

110‧‧‧Light mask

120‧‧‧Lens module

122‧‧‧ front lens group

124‧‧‧Distribution unit

126‧‧‧First rear lens group

128‧‧‧Second rear lens group

129‧‧‧ reflector

130‧‧‧Image Detection Unit

131‧‧‧First actuator

132‧‧‧second actuator

140‧‧‧Control unit

B, B0, B1, B2‧‧‧ image beam

D1‧‧‧ offset

J1‧‧‧second corresponding movement amount

L, L0, L1, L2‧‧‧ illumination beam

M1‧‧‧ first corresponding amount of movement

200, 201, 202, 1300, 1301, 1302, F0, F1, F2, P0, P1, P2‧‧‧ position

Claims (12)

An image detecting device for detecting an object to be tested, the image detecting device comprising: a light source for providing an illumination beam; and a light mask disposed on the transmission path of the illumination beam, the light mask having a light-transmitting aperture through which the illumination beam passes through the light-shielding aperture; a lens module disposed on a transmission path of the illumination beam from the light-transmissive aperture to project the illumination beam to the light The object to be tested reflects the illumination beam into an image beam, the lens module is disposed on the transmission path of the image beam; and an image detection unit is disposed on the image beam from the lens module The image of the object to be tested is imaged on the image detecting unit, and a control unit is electrically connected to the image detecting unit, and is detected according to the image detecting unit. The offset state of the image causes the image detecting unit to move with the light mask. The image detecting device of claim 1, wherein the object to be tested is an eyeball, and the control unit recognizes a pupil image of the eyeball in the image detected by the image detecting unit, and Determining a position of the pupil image on the image detecting unit, and calculating an offset of the position of the pupil image, and the control unit causes the image detecting unit according to the offset of the pupil image The light mask moves. An image detecting device according to claim 2, wherein The control unit first confirms whether the position of the pupil image is in the central area of the image detecting unit, and if not, calculates the offset of the position of the pupil image. The image detecting device of claim 3, wherein the control unit calculates a first corresponding amount of movement of the light mask and a portion of the image detecting unit according to the offset of the pupil image And corresponding to the movement amount, the control unit moves the light mask by the first corresponding movement amount, and after the image detecting unit moves the second corresponding movement amount, the illumination beam is incident on the pupil of the eyeball, and the The image formed by the image detecting unit of the eyeball is aligned with the image detecting unit. The image detecting device of claim 1, further comprising: a first actuator electrically connected to the control unit, wherein the control unit drives the light mask to move by the first actuator And a second actuator electrically connected to the control unit, wherein the control unit drives the image detecting unit to move by the second actuator. The image detecting device of claim 1, wherein the lens module comprises: a front lens group disposed on a transmission path of the illumination beam from the transparent aperture, and configured to be from the And a light splitting unit disposed on the transmission path of the illumination beam and the image beam, the spectroscopic unit transmitting the illumination beam from the transparent aperture to the front lens group And transmitting the image beam from the object to be tested to the Image detection unit. The image detecting device of claim 1, wherein the movement of the image detecting unit and the movement of the light mask are relative to the relative movement of the light source and the lens module. An image detecting method for detecting an object to be tested, the image detecting method comprising: providing an illumination beam; and transmitting the illumination light to the object to be tested through a transparent opening of a light mask; The image of the object to be tested is imaged on an image detecting unit; and the light mask and the image detecting unit are moved according to an offset state of the image of the object to be tested on the image detecting unit. The image detecting method of claim 8, wherein the object to be tested is an eyeball, and the light mask and the image are moved according to an offset state of the image of the eyeball on the image detecting unit. The detecting unit includes: identifying a pupil image in the image detected by the image detecting unit; determining a position of the pupil image on the image detecting unit; and calculating an offset of the position of the pupil image And moving the image detecting unit and the light mask according to the offset of the pupil image. The image detecting method of claim 9, wherein the image is offset according to the image of the object to be tested on the image detecting unit The step of moving the light mask and the image detecting unit further includes: before calculating the offset of the position of the pupil image, confirming whether the position of the pupil image is in a central region of the image detecting unit, If not, the offset of the position of the pupil image is calculated. The image detecting method of claim 10, wherein the step of moving the image detecting unit and the light mask according to the offset of the pupil image comprises: according to the offset of the pupil image Calculating a first corresponding movement amount of the light mask and a second corresponding movement amount of the image detecting unit; and moving the light mask with the first corresponding movement amount and the second corresponding movement amount respectively The image detecting unit is configured such that the illumination beam is incident on the pupil of the eyeball, and the image formed by the fundus of the eyeball is aligned with the image detecting unit. The image detecting method of claim 8, wherein the object to be tested is an eyeball, and the method of imaging the image of the object to be detected on the image detecting unit comprises: using a lens module to The image of the object to be tested is imaged on the image detecting unit; and the method for moving the light mask and the image detecting unit according to the offset state of the image of the eyeball on the image detecting unit comprises: The light mask moves relative to the lens module; and the image detecting unit is moved relative to the lens module.