Fig. 1
From: A psychology of the film
Example of perceptual disregard in the cinema. Hochberg (2007) discusses the view of objects moving in front of a landscape. In normal film viewing flatness of studio-backgrounds and quasi-camera movement is disregarded. Traditional films can use a painted or projected landscape at the backdrop of the set, and panning camera movements instead of a really mobile camera to create a convincing impression in the viewer of following a moving object in the scene’s space. A cycling woman is followed in a pan shot moving from left to right; frames A and B constitute the beginning and the end of the panning shot. In normal perception in the real-world objects on the horizon seem to move in the direction of the moving subject, whereas nearby objects move in opposite direction. Panning involves a stationary viewpoint, causing the image to lack this 'motion parallax'. For example, the scarecrow in the middle ground of frame B should be further to the left from the ridge on the horizon than in frame A (DA < DB), but the distance between the objects has remained identical (DA = DB). However, the lack of parallax and resulting apparent flatness can be and is disregarded and viewers experience smooth self-motion parallel to the moving object. Disregard such a this is part and parcel of normal film viewing or the "ecology of the cinema".
