Projection system
View Patent ↗A projection system includes an invisible light projector, an imaging unit, an image generator, and a visible light projector. The invisible light projector projects a predetermined invisible light image onto the object via invisible light. The imaging unit captures an image of the invisible light projected from the invisible light projector. The image generator measures a shape of the object based on the image captured by the imaging unit to generate image data showing image content for projection onto the object in accordance with the measured shape. The visible light projector projects the image content shown by the image data onto the object via visible light. The invisible light projector emits pulsed invisible light to project the measurement pattern. The image generator generates the image data based on an image captured in accordance with a timing for the pulsed light emission.
1. A projection system comprising:
a first projector that projects a light of a first wavelength onto an object;
an imaging device that captures an image formed by the light of the first wavelength projected from the first projector;
an image generator that measures a position of the object based on the image captured by the imaging device to generate image data indicating a projection image in accordance with the measured position;
a second projector that projects the projection image indicated by the image data by using a light of a second wavelength different from the first wavelength,
wherein the first projector emits pulsed light of the first wavelength with a pulse width being smaller than one frame period of the projected image by the second projector, and an amount of the pulsed light emitted for a duration of the pulse width being larger than an amount of the light of the second wavelength emitted by the second projector for the same duration, and
the image generator generates the image data based on an image captured in accordance with a timing of the pulsed light emission.
2. The projection system of claim 1 ,
wherein the imaging device captures the image in synchronization with the pulsed light emission.
3. The projection system of claim 2 ,
wherein the imaging device captures the image every time of the pulsed light emission with a predetermined delay period from a timing of the pulsed light emission.
4. The projection system of claim 3 ,
wherein the delay period is on the basis of a distance to the object and the velocity of light.
5. The projection system of claim 1 ,
wherein the imaging device repeatedly captures images by a time interval shorter than a repetition interval between emissions of the pulsed light of the second wavelength, and
the image generator extracts the image captured in accordance with the timing of the pulsed light emission from the images repeatedly captured.
6. The projection system of claim 1 ,
wherein an exposure period for the imaging device to capture the image is shorter than or equal to half of a pulse cycle for the pulsed light emission.
7. The projection system claim 1 ,
wherein the first projector comprises a pulsed light source including a pulsed laser device.
8. The projection system of claim 1 ,
wherein the light of the first wavelength is an invisible light.
9. The projection system of claim 8 ,
wherein the invisible light is infrared light.
10. The projection system of claim 1 ,
wherein an image formed by the light of the first wavelength, projected onto the object is a measurement pattern in accordance with a space encoding method.
11. The projection system of claim 1 ,
wherein the measured position is a position in three-dimensional space.
12. The projection system of claim 1 ,
wherein an optical axis of the first projector and an optical axis of the imaging device are parallel with each other.
13. The projection system of claim 1 ,
wherein the measured position is obtained based on a distance from the first projector to the object.
14. A projection method comprising:
projecting a light of a first wavelength onto an object by a first projector;
capturing by an imaging device, an image formed by the light of the first wavelength projected from the first projector;
measuring a position of the object based on the image captured by the imaging device;
generating by an image generator, image data indicating a projection image in accordance with the measured position; and
projecting by a second projector, the projection image indicated by the image data by using a light of a second wavelength different from the first wavelength, wherein
the projecting of the light of the first wavelength comprises emitting, by the first projector, pulsed light of the first wavelength with a pulse width being smaller than one frame period of the projected image by the second projector, and an amount of the pulsed light emitted for a duration of the pulse width being larger than an amount of the light of the second wavelength emitted by the second projector for the same duration, and
the image data is generated based on an image captured in accordance with a timing of the pulsed light emission.
15. The projection method of claim 14 ,
wherein the imaging device captures the image in synchronization with the pulsed light emission.
16. The projection method of claim 15 ,
wherein the imaging device captures the image every time of the pulsed light emission with a predetermined delay period from a timing of the pulsed light emission.
17. The projection method of claim 16 ,
wherein the delay period is on the basis of a distance to the object and the velocity of light.
18. The projection method of claim 14 ,
wherein the imaging device repeatedly captures images by a time interval shorter than a repetition interval between emissions of the pulsed light of the second wavelength, and
the image generator extracts the image captured in accordance with the timing of the pulsed light emission from the images repeatedly captured.
19. The projection method of claim 14 ,
wherein an exposure period for the imaging device to capture the image is shorter than or equal to half of a pulse cycle for the pulsed light emission.
20. The projection method of claim 14 ,
wherein the first projector comprises a pulsed light source including a pulsed laser device.
21. The projection method of claim 14 ,
wherein the light of the first wavelength is an invisible light.
22. The projection method of claim 21 ,
wherein the invisible light is infrared light.
23. The projection method of claim 14 ,
wherein an image formed by the light of the first wavelength, projected onto the object is a measurement pattern in accordance with a space encoding method.
24. The projection method of claim 14 ,
wherein the measured position is a position in three-dimensional space.
25. The projection method of claim 14 ,
wherein an optical axis of the first projector and an optical axis the imaging device are parallel with each other.
26. The projection method of claim 14 ,
wherein the measured position is obtained based on a distance from the first projector to the object.