Image display device

1. An image display device comprising:

a panel in a curved surface shape to let through and reflect incident light;

a first display device to display a first image that reaches a predetermined position through the panel, the first image being based on first image data;

a second display device to display a second image that is reflected by the panel and reach the predetermined position, the second image being based on second image data; and

processing circuitry

to acquire position information indicating a position of an actual viewpoint of an observer observing the first image and the second image,

to determine a scaling factor of the second image data for each scan line based on the position information, and

to perform a scaling process for each scan line on the second image data to be inputted to the second display device by using the scaling factor.

2. The image display device according to claim 1 , wherein the panel is in a concave surface shape as viewed from the viewpoint.

3. The image display device according to claim 2 , wherein a cross section of the panel slicing the panel at a horizontal plane including a line of sight heading from the viewpoint towards the panel is in a straight shape, and a cross section of the panel slicing the panel at a vertical plane including the line of sight is in an arc-like shape.

4. The image display device according to claim 3 , wherein the scaling process for each scan line is a scaling process in a horizontal scan line direction.

5. The image display device according to claim 2 , wherein a cross section of the panel slicing the panel at a horizontal plane including a line of sight heading from the viewpoint towards the panel is in an arc-like shape, and a cross section of the panel slicing the panel at a vertical plane including the line of sight is in a straight shape.

6. The image display device according to claim 5 , wherein the scaling process for each scan line is a scaling process in a vertical scan line direction.

7. The image display device according to claim 1 , wherein the processing circuitry performs a process of scaling the first image based on the first image data.

8. The image display device according to claim 1 , wherein the processing circuitry performs the scaling process for each scan line so that a real image surface recognized by the observer as a place where a real image corresponding to the first image exists and a virtual image surface recognized by the observer as a place where a virtual image corresponding to the second image exists intersect with each other.

9. The image display device according to laim 1 , wherein the processing circuitry performs the scaling process for each scan line so that a real image surface recognized by the observer as a place where a real image corresponding to the first image exists and a virtual image surface recognized by the observer as a place where a virtual image corresponding to the second image exists intersect with each other and an angle formed by the real image surface and the virtual image surface is maintained at a constant angle.

10. The image display device according to claim 8 , wherein:

the processing circuitry previously stores reference information indicating a relationship between the position information and the virtual image surface as a database and

the processing circuitry calculates the scaling factor for each scan line based on the position information and the reference information in the database.

11. The image display device according to claim 8 , wherein

the processing circuitry acquires vehicle information indicating condition of a vehicle equipped with the image display device, and

the processing circuitry calculates the scaling factor for each scan line based on the vehicle information.