Projection apparatus, projection method and recording medium recording the projection method

• US 20050046803A1
• Filed: 08/05/2004
• Published: 03/03/2005
• Est. Priority Date: 08/25/2003
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Akutsu, Takashi
• Granted Patent: US 7,070,283 B2
• Time in Patent Office: Days
• US Class Current: 353/69
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A projection apparatus comprising a projection section for projecting an image corresponding to an input image signal, a distance measuring section for measuring each distance of several positions on an image projection plane made by the projection section, a focus control section for making keystone correction on an image projected by the projection section so that a projection image is formed into a rectangular shape having a proper aspect ratio based on each distance obtained by the distance measuring section while controlling a focus position of the image projected by the projection section, and a control section for instructing to carry out processing by the focus control section.

Claims

1. A projection apparatus comprising:

a projection section for projecting an image corresponding to an input image signal;

a distance measuring section for measuring each distance of several positions on an image projection plane made by the projection section;

a keystone correction section for making keystone correction on an image projected by the projection section so that a projection image is formed into a rectangular shape having a proper aspect ratio based on each distance obtained by the distance measuring section;

a focus control section for controlling a focus position of the image projected by the projection section based on the distance obtained by the distance measuring section; and

a control section for instructing to carry out processings by the distance measuring section, the keystone correction section and the focus control section.

2. The apparatus according to claim 1, wherein the control section includes a single key for instructing to carry out processings by at least one of the distance measuring section, the keystone correction section and the focus control section.

3. The apparatus according to claim 1, further comprising:

a setup section for setting whether or not a setup of keystone correction by the keystone correction section is made in accordance with to the instruction of the control section.

4. The apparatus according to claim 1, wherein an instruction by the control section is automatically carried out when an apparatus power is turned on.

5. The apparatus according to claim 1, further comprising:

a movement detecting section for detecting a movement of the apparatus,

the instruction by the control section being automatically carried out when the movement detecting section detects the movement of the apparatus.

6. The apparatus according to claim 1, further comprising:

a select section for selecting a one-shot mode for carrying out processings by the distance measuring section, the keystone correction section and the focus section only one time in accordance with the instruction by the control section, and a continue mode for continuously carrying out processings by the distance measuring section, the keystone correction section and the focus section until a second time instruction is made after the first time instruction by the control section.

7. The apparatus according to claim 1, wherein the distance measuring section measures distances relevant to several positions on a chart image projected for measuring a distance.

8. The apparatus according to claim 7, wherein the chart image projected for measuring a distance is composed of a horizontal chart image for measuring each distance with respect to several positions in the horizontal direction, and a vertical chart image for measuring each distance with respect to several positions in the vertical direction.

9. The apparatus according to claim 4, wherein the instruction by the control section is carried out when a predetermined time elapses after the apparatus powers on.

10. The apparatus according to claim 4, further comprising:

a temperature sensing section for sensing a temperature of a light source lamp of the projection section,

the instruction by the control section being carried out when the temperature sensing section makes a detection that the temperature of the lamp becomes more than a predetermined value after a power of the apparatus is turned on.

11. The apparatus according to claim 4, further comprising:

a luminance sensing section for sensing a luminance of a light source lamp of the projection section,

the instruction by the control section being carried out when the luminance sensing section makes a detection that the luminance of the lamp becomes more than a predetermined value after a power of the apparatus is turned on.

12. The apparatus according to claim 4, wherein a first time instruction by the control section is carried out after the apparatus powers on, and a second time instruction by the control section is again carried out when a predetermined time elapses after the focus control section acquires a focus position.

13. A projection method comprising:

projecting an image corresponding to an input image signal;

measuring each distance of several positions of the image projected on an image projection plane;

keystone correcting on the projected image so that a corrected projection image is formed into a rectangular shape having a proper aspect ratio based on each distance obtained by the distance measuring;

controlling a focus position of the projected image based on each distance obtained by the distance measuring; and

instructing to carry out processings by the distance measuring, the keystone correcting and the focus controlling.

14. The method according to claim 13, further comprising:

setting whether or not a setup of a keystone correction process by the keystone correcting is made in accordance with to the instructing.

15. The method according to claim 13, further comprising:

detecting a movement of the apparatus,

the instructing being automatically carried out when the movement of the apparatus is detected by the movement detecting.

16. The method according to claim 13, further comprising:

selecting a one-shot mode for carrying out processings by the distance measuring, the keystone correcting and the focus controlling only one time in accordance with the instructing, and a continue mode for continuously carrying out processings by the distance measuring, the keystone correcting and the focus controlling until a second time instructing is made after the first time instructing.

17. A recording medium recording a projection method comprising:

projecting an image corresponding to an input image signal;

measuring each distance of several positions on an image projection plane made by the projecting;

keystone correcting on an image projected by the projecting so that a projection image is formed into a rectangular shape having a proper aspect ratio based on each distance obtained by the distance measuring;

controlling a focus position of the image projected by the projecting based on each distance obtained by the distance measuring; and

instructing to carry out processings by the distance measuring, the keystone correcting and the focus controlling.

18. The recording medium recording the projection method according to claim 17, further comprising:

setting whether or not a setup of keystone correction by the keystone correcting is made in accordance with to the instructing.

19. The recording medium recording the projection method according to claim 17, further comprising:

detecting a movement of the apparatus,

the instructing being automatically carried out when the movement of the apparatus is detected in the movement detecting.

20. The recording medium recording the projection method according to claim 17, further comprising:

selecting a one-shot mode for carrying out processings by the distance measuring, the keystone correcting and the focus controlling only one time in accordance with the instruction by the instructing, and a continue mode for continuously carrying out processings by the distance measuring, the keystone correcting and the focus controlling until a second time instruction is made after the first time instruction by the instructing.