Method for adjusting projection system and projection system

1 . A method for adjusting a projection system comprising:

driving a projection device to project an image on a projection target;

driving an image-capturing device to perform image capturing toward the projection target to obtain a captured image, wherein the captured image comprises a target object corresponding to the image;

calculating a projection position of the target object in the captured image based on the target object and the captured image; and

adjusting an output power of an illumination light source module of the projection device based on the projection position and an ambient luminance.

2 . The method according to claim 1 , wherein adjusting the output power of the illumination light source module of the projection device based on the projection position and the ambient luminance comprises:

finding out the corresponding output power in a look-up table to adjust the output power of the illumination light source module based on the projection position and the ambient luminance.

3 . The method according to claim 2 , wherein finding out the corresponding output power in the look-up table comprises:

finding out the corresponding output power according to the look-up table, wherein the look-up table comprises a plurality of projection position ranges and a plurality of ambient luminance ranges, the ambient luminance ranges correspond to the ambient luminance, and the plurality of projection position ranges correspond to the projection position.

4 . The method according to claim 1 , wherein calculating the projection position of the target object in the captured image based on the target object and the captured image comprises:

finding out a bounding box of the target object to extract a first object boundary and a second object boundary of the bounding box in a first direction;

calculating a first edge distance between the first object boundary and a first image boundary of the captured image in the first direction;

calculating a second edge distance between the second object boundary and a second image boundary of the captured image in the first direction; and

calculating the projection position based on the first edge distance and the second edge distance.

5 . The method according to claim 4 , wherein the first direction is parallel to a connecting line of the image-capturing device and a projection lens of the projection device.

6 . The method according to claim 4 , wherein the image is a startup image, and the captured image obtained by the image-capturing device comprises the target object corresponding to the startup image and a non-projected image region not corresponding to the startup image,

wherein, after obtaining the captured image, the method further comprises:

finding out the bounding box of the target object based on the target object and the non-projected image region.

7 . The method according to claim 4 , wherein the image is a calibration image, the calibration image comprises a plurality of calibration points, and the captured image obtained by the image-capturing device comprises the target object corresponding to the calibration image and a plurality of point objects corresponding to the plurality of calibration points,

wherein, after obtaining the captured image, the method further comprises:

finding out the bounding box of the target object based on the target object and the point objects.

8 . The method according to claim 1 , wherein a coordinate system transformation relationship between the projection device and the image-capturing device is pre-stored in the projection device.

9 . A projection system comprising:

a projection device, comprising an illumination light source module, and used for projection on a projection target;

an image-capturing device, used for performing image capturing toward the projection target; and

a processing unit, coupled to the projection device and the image-capturing device, and configured to:

drive the projection device to project an image on the projection target;

drive the image-capturing device to perform image capturing toward the projection target to obtain a captured image, wherein the captured image comprises a target object corresponding to the image;

calculate a projection position of the target object in the captured image based on the target object and the captured image; and

adjust an output power of the illumination light source module of the projection device based on the projection position and an ambient luminance.

10 . The projection system according to claim 9 , wherein the processing unit is configured to:

find out the corresponding output power in a look-up table to adjust the output power of the illumination light source module based on the projection position and the ambient luminance.

11 . The projection system according to claim 10 , wherein the processing unit is configured to:

find out the corresponding output power according to the look-up table, wherein the look-up table comprises a plurality of projection position ranges and a plurality of ambient luminance ranges, the ambient luminance ranges correspond to the ambient luminance, and the plurality of projection position ranges correspond to the projection position.

12 . The projection system according to claim 9 , wherein the processing unit is configured to:

find out a bounding box of the target object to extract a first object boundary and a second object boundary of the bounding box in a first direction;

calculate a first edge distance between the first object boundary and a first image boundary of the captured image in the first direction;

calculate a second edge distance between the second object boundary and a second image boundary of the captured image in the first direction; and

calculate the projection position based on the first edge distance and the second edge distance.

13 . The projection system according to claim 12 , wherein the first direction is parallel to a connecting line of the image-capturing device and a projection lens of the projection device.

14 . The projection system according to claim 12 , wherein the image is a startup image, the captured image obtained by the image-capturing device comprises the target object corresponding to the startup image and a non-projected image region not corresponding to the startup image, and the processing unit is configured to:

find out the bounding box of the target object based on the target object and the non-projected image region.

15 . The projection system according to claim 12 , wherein the image is a calibration image, the calibration image comprises a plurality of calibration points, the captured image obtained by the image-capturing device comprises the target object corresponding to the calibration image and a plurality of point objects corresponding to the plurality of calibration points, and the processing unit is configured to:

find out the bounding box of the target object based on the target object and the point objects.

16 . The projection system according to claim 9 , wherein a coordinate system transformation relationship between the projection device and the image-capturing device is pre-stored in the projection device.