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Improving contrast and sectioning power in confocal imaging by third harmonic generation in SiOx nanocrystallites 被引量:1
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作者 Gilbert Boyer Karsten Plamann 《Chinese Optics Letters》 SCIE EI CAS CSCD 2007年第8期477-479,共3页
We present a new optical microscope in which the light transmitted by a sample-scanned transmission confocal microscope is frequency-tripled by SiOx nanocrystallites in lieu of being transmitted by a confocal pinhole.... We present a new optical microscope in which the light transmitted by a sample-scanned transmission confocal microscope is frequency-tripled by SiOx nanocrystallites in lieu of being transmitted by a confocal pinhole. This imaging technique offers an increased contrast and a high scattered light rejection. It is demonstrated that the contrast close to the Sparrow resolution limit is enhanced and the sectioning power are increased with respect to the linear confocal detection mode. An experimental implementation is presented and compared with the conventional linear confocal mode. 展开更多
关键词 mode Improving contrast and sectioning power in confocal imaging by third harmonic generation in SiO_x nanocrystallites THG
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Underwater image quality enhancement of sea cucumbers based on improved histogram equalization and wavelet transform 被引量:9
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作者 Xi Qiao Jianhua Bao +2 位作者 Hang Zhang Lihua Zeng Daoliang Li 《Information Processing in Agriculture》 EI 2017年第3期206-213,共8页
Sea cucumbers usually live in an environment where lighting and visibility are generally not controllable,which cause the underwater image of sea cucumbers to be distorted,blurred,and severely attenuated.Therefore,the... Sea cucumbers usually live in an environment where lighting and visibility are generally not controllable,which cause the underwater image of sea cucumbers to be distorted,blurred,and severely attenuated.Therefore,the valuable information from such an image cannot be fully extracted for further processing.To solve the problems mentioned above and improve the quality of the underwater images of sea cucumbers,pre-processing of a sea cucumber image is attracting increasing interest.This paper presents a newmethod based on contrast limited adaptive histogram equalization and wavelet transform(CLAHE-WT)to enhance the sea cucumber image quality.CLAHE was used to process the underwater image for increasing contrast based on the Rayleigh distribution,and WTwas used for de-noising based on a soft threshold.Qualitative analysis indicated that the proposed method exhibited better performance in enhancing the quality and retaining the image details.For quantitative analysis,the test with 120 underwater images showed that for the proposed method,the mean square error(MSE),peak signal to noise ratio(PSNR),and entropy were 49.2098,13.3909,and 6.6815,respectively.The proposed method outperformed three established methods in enhancing the visual quality of sea cucumber underwater gray image. 展开更多
关键词 Sea cucumber Underwater image enhancement contrast improvement DE-NOISING
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