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Non-negative matrix factorization is an effective method for partsbased feature extraction, and it can deal with partial occlusion and some illumination problems.

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It is the first important step in video analysis and will directly affects the effectiveness of indexing Shot boundary detection is one of our major research interests and we will tackle the following existing problems the ambiguity between gradual change and camera motion, the discontinuity during gradual change, false detection caused by illumination variation and flashlight, automatic threshold selection Firstly, we discuss shot boundary detection in non-compressed domain In chapter 2, we compare some of the commonly used detection methods which are based on frame difference and point out that single feature will not generate good results As a conclusion, we use fuzzy logic to combine multiple features Presently, most frame difference based shot boundary detection algorithms rely on threshold and hence the selection of such thresholds will greatly affect the performance of boundary detection We propose a membership function to define frame difference and calculate the membership with self adaptation according to the statistic distribution of frame differences to satisfy different type of video clips Experiments show that the proposed fuzzy shot boundary detection algorithm can be used with different video types and has a high detection precision and recall In chapter 3, we discuss model-based shot boundary detection algorithms regarding chromatic and spatial editing effects such as fade-in, fade-out, dissolve and wipe Various parameters are proposed to better describe the characteristics of each editing type.

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Such design makes it easy to mount illumination unit and to replace filament lamp.

這種設(shè)計使照明設(shè)備的裝配和燈泡的更換簡單易行。

The ground of prepares ground of 1.1 cuttage nursery choice cuttage nursery before 1 cuttage should choose earthy and relief evenness, loose, source of water enough, illumination the loam of good, small acidity sandiness that does not have damage caused by a windstorm and freeze injury, control of height above sea level is under 700m, traffic compares convenient place. Cent of bedding of soil preparation of bedding of 1.2 soil preparation undertakes 2 times, first time is comprehensive soil preparation, soil preparation deepness amounts to 30cm above, combine bedding the 2nd times, 15cm of soil preparation deepness, etc of cleared block, fireweed is sundry, make land as far as possible fine.

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A device, such as a flashbulb, flashgun, or flash lamp, used to produce such illumination.

閃光燈：一種用來產(chǎn)生此種照明的裝置，如閃光電燈婷婷丁香五月一区二区三区、閃光槍或閃光燈

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閃光燈一種用來產(chǎn)生此種照明的裝置性欧美在线视频免费，如閃光電燈、閃光槍或閃光燈