Projection apparatus and control method thereof

1. A projection apparatus which projects an image onto a projection plane based on an input image signal, the apparatus comprising:

a decision unit configured to decide a shape of the image to be projected onto the projection plane;

a deformation unit configured to deform shapes of divided images corresponding to the input image signal based on the shape of the image decided by said decision unit;

a combination unit configured to combine the images deformed by said deformation unit such that each of the images is disposed on corresponding coordinates of the shape of the image decided by said decision unit; and

a projection optical system configured to project the image combined by said combination unit onto the projection plane.

2. The apparatus according to claim 1 , further comprising a division unit configured to divide an image represented by the input image signal into a plurality of regions, and temporarily store the divided images in a plurality of independent storage areas,

wherein said deformation unit separately deforms the images stored in the plurality of storage areas, respectively.

3. The apparatus according to claim 1 , wherein

said combination unit combines the plurality of deformed images with each other such that no image which is not based on the input image signal is included between the plurality of deformed images.

4. The apparatus according to claim 1 , wherein

said combination unit reads image signals representing the plurality of deformed images in an order corresponding to a scanning direction of the image projected by said projection optical system.

5. The apparatus according to claim 1 , wherein

said combination unit includes a storage unit having an addressing structure,

said combination unit stores the plurality of images deformed by said deformation unit in said storage unit, and

said projection optical system reads out the images stored in said storage unit in a specific order of address, and projects the images onto the projection plane.

6. The apparatus according to claim 5 , wherein

said combination unit changes a recording address indicating a location, in which the image deformed by said deformation unit is stored in said storage unit, in accordance with the shape of the image decided by said decision unit.

7. The apparatus according to claim 6 , wherein

the deformation state formed by said deformation unit is determined in accordance with a projection angle of the projection apparatus.

8. The apparatus according to claim 6 , wherein

the deformation state formed by said deformation unit is determined in accordance with a shape of the projection plane.

9. A projection method comprising the steps of:

deciding a shape of an image to be projected onto the projection plane;

deforming shapes of divided images corresponding to an input image signal based on the shape of the image decided in the deciding step;

combining the images deformed in the deforming step such that each of the images is disposed on corresponding coordinates of the shape of the image decided in the deciding step; and

projecting the image combined in the combining step onto the projection plane.

10. The method according to claim 9 , further comprising

a dividing step of dividing an image represented by the input image signal into a plurality of regions, and temporarily storing the divided images in a plurality of independent storage areas,

wherein in the deforming step, the images stored in the plurality of storage areas, respectively, are separately deformed.

11. The method according to claim 9 , wherein

in the combining step, the plurality of deformed images are combined with each other such that no image which is not based on the input image signal is included between the plurality of deformed images.

12. The method according to claim 9 , wherein

in the combining step, image signals representing the plurality of deformed images are read in an order corresponding to a scanning direction of the image projected in the projecting step.

13. The method according to claim 9 , wherein

in the combining step, the plurality of images deformed in the deforming step are stored in a memory having an addressing structure, and

in the projecting step, the images stored in the memory are read out in a specific order of address, and projected onto the projection plane.

14. The method according to claim 13 , wherein

in the combining step, a recording address indicating a location, in which the image deformed in the deforming step is stored in the memory, is changed in accordance with the shape of the image decided in the decision step.