Compare and Contrast Marr and Nishihara’s and Biederman’s Theories of Object Recognition. How Well Do They Explain How We Are Able to Recognize Three Dimensional Objects Despite Changes in Viewing Angle?

2394 Words Feb 15th, 2013 10 Pages
Option 2
Compare and contrast Marr and Nishihara’s and Biederman’s theories of object recognition. How well do they explain how we are able to recognize three dimensional objects despite changes in viewing angle?

Humphreys and Bruce (1989) proposed a model of object recognition that fits a wider context of cognition. According to them, the recognition of objects occurs in a series of stages. First, sensory input is generated, leading to perceptual classification, where the information is compared with previously stored descriptions of objects. Then, the object is recognized and can be semantically classified and subsequently named. This approach is, however, over-simplified. Other theories like Marr and Nishihara’s and Biederman’s
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In addition, Biedermann and Gehardstein (1993) investigated the extent to which recognition is object-centered. They used a technique known as repetition priming to find out if presenting one viewpoint of an object would help it to be recognized from another viewpoint. Their results showed that priming occurred if the change in the angle was less135 degrees apart. However, priming was less effective if one or more geon was hidden between the first and the second view, even with a angle inferior to 135 degrees (Kaye, 2010).Their findings not only support Biedermann’s idea that geons are used to generate descriptions, but also support the claim made by both theories that the production of an object description is viewpoint independent. There is also evidence to support the claim made by both theories that concavities are used to divide the objects into components. A study of Biedermann (1987a) demonstrated that deleting the concavity parts of images resulted in greater disruption to recognition than deleting other parts of the contour.

Both theories have indeed great advantage over earlier models such template matching and feature recognition in which the complexities of 3D recognition was not taken into account. However, both present limitations and research that cannot be accommodated. Bulthoff and Edelman (1992), for example, found that participants were not able to recognize novel objects presented from a novel viewpoint, although the view

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