Posted 1/25/06

Reading Assignment:  Chapter 3

_______________ on Perception

• Multiple reasonable ___________________ of a visual scene
• _________________ has a preference for certain interpretations

• ____________ detection
• How to distinguish an object from ______________.
• How to recognize what the _________ is.

• F is detectable based on ______ spatial frequency
• Bs are detectable based on _________ spatial frequency.

• People with _______-hemisphere damage reproduce the _______ (_________ elements)
• Shows that ________ hemisphere is sensitive to __________, not __________.
• People with ______-hemisphere damage reproduce the _______ (_________ shape)
• Shows that ________ hemisphere is sensitive to to __________, not __________.

Segregating Object from Other Objects and Background

• __________ Principles (See Figures 3.9 and 3.10)
• ____________
• Similarity
• Common region
• Good ____________

• _______ Detection Theories
• _______ Theories
• _______ Matching Theories

• Objects have separable, distinct parts called __________.
• Recognizing an object involves
• ____________  a complex scene into features
• _________ features against representations of objects in memory
• ____ is perceived as an ____+ an extra feature
• _________ of a feature is less salient than the _________ of a feature.

• Ignores _______________________ among features – how you put the features together to get the object
• Has to assume that we perceive objects before we can __________________.
• Otherwise, perceptual system would not know which features to combine together
• So, begs the question of how objects are ______________ from the surround.

• Includes both features and ___________ that combine features.
• E.g., distinguish a ___ from a _____
• __________
• Basic geometric shapes from which objects are “built”
• Detected from ______ visual information
• Based on ____________ properties

• Object recognition should not be affected by _______________ (e.g., viewing object from an angle)
• _____________ images should be more recognizable if image preserves the geons
• e.g., by retaining the __________ of the lines (see Figure 3.21 in textbook)

• Images are represented as _________________________
• Recognize an objects by matching its image to a stored ____________.
• ________, then _________ the image
• No need to extract _____________

• Structural description theories posit that representations are ________ centered.
• Representation depends on parts and relationship to parts
• Not on orientation of object wrt viewer
• Template matching theories posit that representations are ___________ centered.
• Image as it appears to the viewer is matched to a ____________.