Image display apparatus and image display method

1. An image display apparatus comprising:

an imaging device configured to generate image data;

a receiving unit configured to receive movement of a display area in a vertical direction or in a horizontal direction within the image data, the display area being displayed on a display device, and also rotation of the image data;

an image processing unit configured to rotate the image data in accordance with an amount of rotation received by the receiving unit, and, in a case where the movement of the display area in a vertical direction or in a horizontal direction relative to the rotated image data that is displayed on the display device is received by the receiving unit with respect to the rotated image data, move the rotated image data in the vertical direction or in the horizontal direction relative to the rotated image data that is displayed on the display device;

an image cutting unit configured to cut, from the image data rotated by the image processing unit, the display area moved by the image processing unit: and

an outputting unit configured to display the display area cut by the image cutting unit on the display device.

2. The image display apparatus according to claim 1 , wherein the image processing unit rotates the image data in accordance with the amount of rotation received by the receiving unit and does not rotate the display area, the image data and the display area being provided in a coordinate system, and,

in a case where the movement of the display area in the vertical direction or in the horizontal direction is received by the receiving unit with respect to the image data rotated in the coordinate system, the image processing unit moves the display area in the vertical direction or in the horizontal direction within the image data rotated in the coordinate system, the display area being not rotated in the coordinate system.

3. The image display apparatus according to claim 1 , wherein in a case where the receiving unit receives the rotation of the image data within which the display area has moved in the vertical direction or in the horizontal direction in accordance with an amount of movement received by the receiving unit, the image processing unit moves the display area in the vertical direction or in the horizontal direction in accordance with the amount of rotation of the image data.

4. The image display apparatus according to claim 3 , wherein the image processing unit moves the display area within the image data provided in the coordinate system in accordance with the amount of movement received by the receiving unit, and

in the case where the receiving unit receives the rotation of the image data within which the display area has moved, the image processing unit rotates the image data in accordance with the amount of rotation received by the receiving unit and does not rotate the display area, and

the image processing unit moves the display area in the vertical direction or in the horizontal direction by a difference between coordinates of a virtual display area rotated together with the image data and coordinates of the display area.

5. The image display apparatus according to claim 3 , wherein in a case where the receiving unit receives the rotation of the image data, the image processing unit rotates the image data in accordance with the amount of rotation, and

moves the display area in the vertical direction or in the horizontal direction in accordance with the amount of rotation of the image data when a center of the image data does not coincide with a center of the display area, and

moves the display area in the vertical direction or in the horizontal direction within the rotated image data when the movement of the display area in the vertical direction or in the horizontal direction is received by the receiving unit with respect to the rotated image data.

6. The image display apparatus according to claim 1 , wherein the imaging device is mounted on a moving object.

7. An image display method comprising:

generating, by an imaging device configured, image data;

receiving, by a receiving unit, movement of a display area in a vertical direction or in a horizontal direction within the image data, the display area being displayed on a display device, and also rotation of the image data;

rotating, by an image processing unit, the image data in accordance with an amount of rotation received by the receiving unit, and, in a case where the movement of the display area in a vertical direction or in a horizontal direction relative to the rotated image data that is displayed on the display device is received by the receiving unit with respect to the rotated image data, moving the display area in the vertical direction or in the horizontal direction relative to the rotated image data that is displayed on the display device;

cutting, by an image cutting unit, from the image data rotated by the image processing unit, the display area moved by the image processing unit; and

displaying, by an outputting unit, the display area cut by the image cutting unit on the display device.