We propose a multimode retina integrating image sensing, normalization, smoothing, differentiation and visual feature extraction by incorporating: 1) a histogram equalization function onto the sensor focal plane, which normalizes the image signal at the same dynamic range under different illumination conditions and results a constant signal amplitude facilitating the post processing; 2) a capacitive Gaussian network and a spatial differentiator, which offer a bandpass filtering on the normalized image; 3) a visual feature extraction, which extracts and localizes the areas enveloping objets of interest.This novel multimode retina, when interfaced with a digital processing unit, does a first step processing and information salient region extraction suited for many real-time vision tasks.
Abstract. In this paper, the author first makes a brief review of writing instruction development. Then she introduces the two kinds of writing instruction approaches: product approach and process approach. In Chapter Two, the author makes a detailed comparison of these two approaches based on data and information from research on current English writing teaching. By comparison, the author finds that both approaches have their advantages and disadvantages: the advantages of product approach lie in the fact that, according to cognitive psychology theory, some aspects of this approach such as imitation and drills and practice comply with learners, acquisition procedure, and as is proved by real classroom teaching, it can of certain help to improve students, writing ability.
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