Movie Processing Apparatus and Control Method Therefor

1. A movie processing apparatus comprising: an input unit configured to input an input image; a memory control unit configured to store, in a memory, a deformation image obtained by executing an image deformation process for the input image using a deformation parameter; a determination unit configured to determine, from a memory region in which the deformation image is stored, a readout region to be accessed for obtaining an output image, on the basis of a size of the input image, a size of the output image, and the deformation parameter; a readout unit, configured to access the readout region, that reads out pixel data included in the deformation image; and an output unit configured to output the image based on the pixel data readout by said readout unit.

2. The apparatus according to claim 1 , wherein, if all four vertices of the deformation image fall within an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determination unit determines, as the readout area, an area including the four vertices.

3. The apparatus according to claim 1 , wherein, if all four vertices of the deformation image fall outside an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determination unit determines the effective area to be the readout area.

4. The apparatus according to claim 1 , wherein, if at least one of four vertices of the deformation image falls within an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determination unit determines an intersection point of the effective area and one of sides, among sides of the deformation image, which have as one end point a vertex outside of the effective area and intersect the effective area, and determines, as the readout area, an area including the intersection point and the vertex falling within the effective area.

5. The apparatus according to claim 1 , wherein said memory control unit controls operation to store pixel data included in the deformation image and coordinate values obtained by transforming coordinate values within the input image using the deformation parameter in association with each other, said readout unit accesses the readout region in order to readout pixel data at coordinate values that correspond to the readout region among coordinate values obtained by transforming coordinate values within the input image using the deformation parameter, and said readout unit does not access the readout region in order to readout pixel data at coordinate values that do not correspond to the readout region among coordinate values obtained by transforming coordinate values within the input image using the deformation parameter.

6. The apparatus according to claim 1 , further comprising a mask processing unit configured, among pixel data readout by said readout unit, to perform a mask process for pixel data that correspond to a region that is specified based on the deformation parameter, wherein said output unit outputs, as the output image, an image obtained by the mask process performed by said mask processing unit.

7. A movie processing method comprising: an inputting step to input an input image; a memory control step to store, in a memory, a deformation image obtained by executing an image deformation process for the input image using a deformation parameter; a determining step to determine, from a memory region in which the deformation image is stored, a readout region to be accessed for obtaining an output image, on the basis of a size of the input image, a size of the output image, and the deformation parameter; a readout step, configured to access the readout region, for reading out pixel data included in the deformation image; and an outputting step to output the image based on the pixel data readout in said readout step.

8. The method according to claim 7 , wherein, if all four vertices of the deformation image fall within an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determining step determines, as the readout area, an area including the four vertices.

9. The method according to claim 7 , wherein, if all four vertices of the deformation image fall outside an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determining step determines the effective area to be the readout area.

10. The method according to claim 7 , wherein, if at least one of four vertices of the deformation image falls within an effective area that is determined on the basis of the size of the input image, the size of the output image, and the deformation parameter, said determining step determines an intersection point of the effective area and one of sides, among sides of the deformation image, which have as one end point a vertex outside of the effective area and intersect the effective area, and determines, as the readout area, an area including the intersection point and the vertex falling within the effective area.

11. The method according to claim 7 , wherein said memory control step controls operation to store pixel data included in the deformation image and coordinate values obtained by transforming coordinate values within the input image using the deformation parameter in association with each other, said readout step accesses the readout region in order to readout pixel data at coordinate values that correspond to the readout region among coordinate values obtained by transforming coordinate values within the input image using the deformation parameter, and said readout step does not access the readout region in order to readout pixel data at coordinate values that do not correspond to the readout region among coordinate values obtained by transforming coordinate values within the input image using the deformation parameter.

12. The method according to claim 7 , further comprising a mask processing step configured, among pixel data readout in said readout step, to perform a mask process for pixel data that correspond to a region that is specified based on the deformation parameter, wherein said outputting step outputs, as the output image, an image obtained by the mask process performed in said mask processing step.