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

• US 7,070,283 B2
• Filed: 08/05/2004
• Issued: 07/04/2006
• Est. Priority Date: 08/25/2003
• Status: Active Grant

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Akutsu, Takashi
• Primary Examiner(s): KOVAL, MELISSA J
• Application Number:
  US10/913,984
• Publication Number:
  US 20050046803A1
• Time in Patent Office: 698 Days
• Field of Search: 353/30, 353/69, 353/70, 353/101, 353/121, 353/52, 353/85, 348/745, 348/746, 348/806, 345/643, 345/647, 352/140
• 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 respective distances to positions on an image projection plane made by the projection section;

a keystone correction section for performing keystone correction on an image projected by the projection section so that the projected image is formed into a rectangular shape having a proper aspect ratio, based on the distances 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 at least one of the distances obtained by the distance measuring section;

a control section for issuing an instruction to carry out processings by the distance measuring section, the keystone correction section and the focus control section; and

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

wherein the control section automatically issues the instruction when the temperature sensing section detects that the temperature of the lamp is more than a predetermined value after vower of the apparatus is turned on.

2. The apparatus according to claim 1, wherein the control section includes a single key for instructing to carry out the processing 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 the keystone correction by the keystone correction section is is to be carried out when the instruction is issued by the control section.

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

a movement detecting section for detecting movement of the apparatus,

wherein the control section automatically issues the instruction when the movement detecting section detects the movement of the apparatus.

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

a select section for selecting;

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

6. The apparatus according to claim 1, wherein the distance measuring section measures the distances with respect to positions on a chart image projected for distance measuring.

7. The apparatus according to claim 6, wherein the chart image comprises a horizontal chart image for measuring distances with respect to positions in a horizontal direction, and a vertical chart image for measuring distances with respect to positions in a vertical direction.

8. The apparatus according to claim 1, wherein the instruction is issued a first time by the control section after the apparatus powers on, and a second time instruction is issued by the control section when a predetermined time elapses after the focus control section acquires a focus position.

9. A projection apparatus comprising

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

a distance measuring section for measuring respective distances to positions on an image projection plane made by the projection section;

a keystone correction section for performing keystone correction on an image projected by the projection section so that the projected image is formed into a rectangular shape having a proper aspect ratio, based on the distances 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 at least one of the distances obtained by the distance measuring section; and

a control section for issuing an instruction to carry out processings by the distance measuring section, the keystone correction section and the focus control section;

wherein the instruction is issued by the control section when it is determined that a predetermined period of time has elapsed after power of the apparatus is turned on.

10. A projection apparatus comprising:

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

a distance measuring section for measuring respective distances to positions on an image projection plane made by the projection section;

a keystone correction section for performing keystone correction on an image projected by the projection section so that the projected image is formed into a rectangular shape having a proper aspect ratio, based on the distances 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 at least one of the distances obtained by the distance measuring section;

a control section for issuing an instruction to carry out processings by the distance measuring section, the keystone correction section and the focus control section;

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

wherein the instruction is issued by the control section when the luminance sensing section detects that the luminance of the lamp is more than a predetermined value after a power of the apparatus is turned on.