Digital Signal Processing Reference
In-Depth Information
TextureGradient
The closer we are to an object, the more detail we can see of its surface
texture. This effect is shown in Figure 6.3. Therefore, objects with smooth
textures are usually interpreted as being farther away. This is especially true
if the surface texture spans the distance from near to far, with respect to the
camera.
Overlapping
When objects block each other out of our sight, we know that an object that
obscures another one is closer to us. The object whose outline pattern looks
more continuous is felt to lie closer. This effect is illustrated in Figure 6.4.
Aerial Perspective
Aerial perspective is also referred to as relative height. With this cue, the
HVS assumes that objects closer to the line of horizon are further away. This
phenomenon relates to the way light scatters in the air, causing objects on
Figure 6.3
Texture gradient
Figure 6.4
Overlapping
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