DCT Based Edge Detector for Snapshot Images
碩士 === 國立中正大學 === 電機工程研究所 === 90 === In this thesis, we propose a discrete cosine transform (DCT)-based edge detector for snapshot images that are obtained by performing decimation (by a factor of two or more) on a much larger original image. We first partition the original image into no...
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ndltd-TW-090CCU004420352015-10-13T17:34:58Z http://ndltd.ncl.edu.tw/handle/39633421422710894975 DCT Based Edge Detector for Snapshot Images 以離散餘旋轉換為基準的邊緣偵測演算法 Mon-Wei Wu 吳孟韋 碩士 國立中正大學 電機工程研究所 90 In this thesis, we propose a discrete cosine transform (DCT)-based edge detector for snapshot images that are obtained by performing decimation (by a factor of two or more) on a much larger original image. We first partition the original image into non-overlapping blocks where the block size equals the decimation factor and then perform DCT on each block. The variances of the DCT’s AC coefficients are used to decide the edge map of snapshot images. Directional edge map of the snapshot images can also be generated if the variance of the directional AC coefficients in vertical, horizontal, or diagonal direction is used. Simulation results show that the proposed DCT-based edge detector performs better (based on objective PSNR criterion) than the conventional technique─applying edge detector on the down-sampled image. C. J. Kuo 郭鐘榮 2002 學位論文 ; thesis 75 zh-TW |
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碩士 === 國立中正大學 === 電機工程研究所 === 90 === In this thesis, we propose a discrete cosine transform (DCT)-based edge detector for snapshot images that are obtained by performing decimation (by a factor of two or more) on a much larger original image. We first partition the original image into non-overlapping blocks where the block size equals the decimation factor and then perform DCT on each block. The variances of the DCT’s AC coefficients are used to decide the edge map of snapshot images. Directional edge map of the snapshot images can also be generated if the variance of the directional AC coefficients in vertical, horizontal, or diagonal direction is used. Simulation results show that the proposed DCT-based edge detector performs better (based on objective PSNR criterion) than the conventional technique─applying edge detector on the down-sampled image.
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C. J. Kuo |
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C. J. Kuo Mon-Wei Wu 吳孟韋 |
author |
Mon-Wei Wu 吳孟韋 |
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Mon-Wei Wu 吳孟韋 DCT Based Edge Detector for Snapshot Images |
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Mon-Wei Wu |
title |
DCT Based Edge Detector for Snapshot Images |
title_short |
DCT Based Edge Detector for Snapshot Images |
title_full |
DCT Based Edge Detector for Snapshot Images |
title_fullStr |
DCT Based Edge Detector for Snapshot Images |
title_full_unstemmed |
DCT Based Edge Detector for Snapshot Images |
title_sort |
dct based edge detector for snapshot images |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/39633421422710894975 |
work_keys_str_mv |
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