Projection system and image projection method

Patent metadata

Field	Value
Publication number	US-11792335-B2
Application number	US-202217693437-A
Country	US
Kind code	B2
Filing date	Mar 14, 2022
Priority date	Mar 17, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A projection system, including a projection target, a projection device, an image capturing device, and a processor circuit, is provided. The projection target includes a reflective surface and an anti-reflective film disposed on the reflective surface. The anti-reflective film defines a projection range. The image capturing device captures a first captured image containing the projection target. The first captured image includes an image of the anti-reflective film. The processor circuit determines a position and a shape of the anti-reflective film in the first captured image according to the first captured image. The projection device projects a projection image on the projection target. The projection device adjusts the projection image according to the position and the shape of the anti-reflective film, and correspondingly adjusts the projection image to the projection range. In addition, an image projection method is also provided.

First claim

What is claimed is:

1. A projection system, comprising a projection target, a projection device, an image capturing device, and a processor circuit, wherein
the projection target comprises a reflective surface and an anti-reflective film disposed on the reflective surface, and the anti-reflective film defines a projection range,
the image capturing device captures a first captured image, wherein the first captured image comprises an image of the projection target and the anti-reflective film, and
the processor circuit determines a position and a shape of the anti-reflective film in the first captured image according to the first captured image, the projection device projects a projection image on the projection target, the projection device adjusts the projection image according to the position and the shape of the anti-reflective film, and correspondingly adjusts the projection image to the projection range.

2. The projection system according to claim 1 , wherein the projection device projects a correction image having a correction pattern, the image capturing device captures a second captured image containing the correction image, and the processor circuit determines coordinate conversion information of the projection device and the image capturing device according to the correction pattern in the second captured image.

3. The projection system according to claim 2 , wherein the projection device further adjusts the projection image according to the coordinate conversion information and correspondingly adjusts the projection image to the projection range.

4. The projection system according to claim 1 , wherein image data of the first captured image has a grayscale value range and/or a color value range corresponding to the anti-reflective film, and the processor circuit determines the position and the shape of the anti-reflective film in the first captured image according to the grayscale value range and/or the color value range corresponding to the anti-reflective film.

5. The projection system according to claim 4 , wherein the processor circuit analyzes a grayscale value and/or a color value of the image data of the first captured image and compares with the grayscale value range and/or the color value range corresponding to the anti-reflective film, so as to determine the position and the shape of the anti-reflective film in the first captured image.

6. The projection system according to claim 1 , wherein a proportion of the image of the anti-reflective film in the first captured image is greater than or equal to 50%.

7. The projection system according to claim 1 , wherein the projection target comprises a metal surface of an elevator, the metal surface of the elevator serves as the reflective surface, and the anti-reflective film is affixed to the metal surface of the elevator.

8. The projection system according to claim 1 , wherein an aspect ratio of the projection range is less than one.

9. The projection system according to claim 1 , wherein the projection device comprises the image capturing device and/or the processor circuit.

10. The projection system according to claim 1 , wherein the projection device does not project an image or the projection device projects a single-color image when the image capturing device captures the first captured image containing the projection target.

11. An image projection method, used in a projection system, wherein the projection system comprises a projection device and an image capturing device, the image projection method comprising steps of:
capturing a first captured image through the image capturing device, wherein the first captured image contains an image of a projection target, the projection target comprises a reflective surface and an anti-reflective film disposed on the reflective surface, and the anti-reflective film defines a projection range;
determining a position and a shape of the anti-reflective film in the first captured image according to the first captured image;
project a projection image on the projection target through the projection device; and
adjusting the projection image according to the position and the shape of the anti-reflective film, and correspondingly adjusting the projection image to the projection range.

12. The image projection method according to claim 11 , further comprising:
projecting a correction image having a correction pattern through the projection device;
capturing a second captured image comprising the correction image through the image capturing device; and
determining coordinate conversion information of the projection device and the image capturing device according to the correction pattern in the second captured image.

13. The image projection method according to claim 12 , wherein the step of adjusting the projection image according to the position and the shape of the anti-reflective film in the first captured image, and adjusting the projection image to the projection range further comprises adjusting the projection image according to the coordinate conversion information, and correspondingly adjusting the projection image to the projection range.

14. The image projection method according to claim 11 , wherein image data of the first captured image has a grayscale value range and/or a color value range corresponding to the anti-reflective film, and the step of determining a position and a shape of the anti-reflective film in the first captured image according to the first captured image further comprises determining the position and the shape of the anti-reflective film in the first captured image according to the grayscale value range and/or the color value range corresponding to the anti-reflective film.

15. The image projection method according to claim 14 , wherein the step of determination of the position and the shape of the anti-reflective film in the first captured image according to the first captured image comprises analyzing a grayscale value and/or a color value of the image data of the first captured image, and comparing with the grayscale value range and/or the color value range corresponding to the anti-reflective film, so as to determine the position and the shape of the anti-reflective film in the first captured image.

16. The image projection method according to claim 11 , wherein a proportion of an image of the anti-reflective film in the first captured image is greater than or equal to 50%.

17. The image projection method according to claim 11 , wherein the projection target comprises a metal surface of an elevator, the metal surface of the elevator serves as the reflective surface, and the anti-reflective film is affixed to the metal surface of the elevator.

18. The image projection method according to claim 11 , wherein an aspect ratio of the projection range is less than one.

19. The image projection method according to claim 11 , wherein the step of capturing of the first captured image containing the projection target through the image capturing device comprises the projection device not projecting an image or the projection device projecting a single-color image.

Assignees

• Coretronic Corp

Inventors

• Peng Chien-Chun
• Tu Hsun-Cheng
• Lin Chi-Wei
• Chien Chun-Lin

Classifications

• H04N1/00267 Primary

  with a viewing or projecting apparatus, e.g. for reading image information from a film (H04N1/00262 takes precedence) · CPC title

• G03B21/60 Primary

  characterised by the nature of the surface · CPC title

• G06T5/006

  Physics · mapped topic

• G06T5/50

  using two or more images, e.g. averaging or subtraction · CPC title

• G06T7/70

  Determining position or orientation of objects or cameras (camera calibration G06T7/80) · CPC title