Note the change in the shape of the TV.
745 KB MPEG 
527 KB MPEG 
608 KB MPEG 
617 KB MPEG 
650 KB MPEG 
606 KB MPEG Some simple animations showing perspective distortion and ways to correct it:
Distortion can be corrected by moving the camera away from the scene. Note that the camera for non-distorted image moves mostly outside the room.
| 90 degree field of view. Note the change in the shape of the TV. |
745 KB MPEG |
| Camera motion, 90 degree field of view. |
527 KB MPEG |
| Changing the field of view from 90 to 4 degrees. |
608 KB MPEG |
| Camera motion for changing the field of view. |
617 KB MPEG |
| 36 degree field of view. |
650 KB MPEG |
| Camera motion, 36 degree field of view. |
606 KB MPEG |
Moving the camera does not help: the appearance of the scene changes too much (first two clip pairs.) In this case, our transformation may produces better results.
| Changing the field of view from 90 to 60 degrees; keeping the pyramids in the field of view. |
608 KB MPEG |
| Camera motion for changing the field of view. | 
617 KB MPEG |
| Changing the field of view from 90 to 60 degrees; preserving the projection of the middle of the scene. |
608 KB MPEG |
| Camera motion for changing the field of view. | 
617 KB MPEG |
| Linear perspective, 90 degree field of view; note the distortion of the figures as the camera moves. |
608 KB MPEG |
| Transformed image, 90 degree field of view. | 
971 KB MPEG |
| Camera motion for 90 degree field of view. | 
617 KB MPEG |