標題: 應用矩量保持技術於影像改良,壓縮與分析
Image Enhancement, Compression, and Analysis by Moment- Preserving Techniques
作者: 楊健貴
Yang, Jian-Gui
蔡文祥
Cai, Wen-Xiang
資訊科學與工程研究所
關鍵字: 影像改良;影像壓縮;影像分析;矩量保持;資訊;電腦科學;Image Enhancement;Image Compression;Image Preserving;INFORAMTION;COMPUTER-SCIENCE
公開日期: 1995
摘要: First, a method of color image sharpening by moment- preserving
(MP) is proposed. We develop a new set of color monents. By
preserving some color moments of the n*n neighborhood of each
pixel, analytic formulas are derived to compute two
representative sets of tristimulus color values, and one of
them is assign to the pixel as the sharpening result. Second,
three image compression methods using MP techniques are
proposed. The first method is an improvement of the BTC method.
A set of line and edge bit planes are predefined and an
adaptive bit plane selection scheme is developed. The second
method is a color image compression scheme using MP and BTC
techniques. We preserve the new set of color moments mentioned
previously to obtain two representative colors and use the
Euclidean distance measure to generate a bit-map for each image
block. We also present a revised version of the proposed method
to obtain a higher compression and good reconstructed image
quality. In the third proposed method, a new approach to color
quantization using MP thresholding and efficient coding of edge
detection results on the bit map are included. Beside, a new
approach to subpixel edge detection by mass MP is also
proposed. The edge location can estimated directly from
analytic formulas with subpixel accuracy. Finally, a method for
reduction of color space dimensionality is proposed. After
obtaining two representative colors in each image block, we
employ the difference vector between the two colors as an axis
onto which all the data in the block are projected to reduce
the color space into one dimensional. A single spectral image
is thus obtained, on which the proposed subpixel edge detection
by mass MP is implemented to perform color edge detection.
Experimental results are given to show the effectiveness of all
the proposed methods.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT844394017
http://hdl.handle.net/11536/61217
Appears in Collections:Thesis