图像复原是利用退化现象的某种先验知识(退化模型),按退化的逆过程重建图像的技术。其退化模型是原始图像经过算子,或系统经退化因素作用之后和噪声叠加,以形成退化后的图像,即实际得到的图像。逆滤波器复原的原理,是利用已知复原图象...图像复原是利用退化现象的某种先验知识(退化模型),按退化的逆过程重建图像的技术。其退化模型是原始图像经过算子,或系统经退化因素作用之后和噪声叠加,以形成退化后的图像,即实际得到的图像。逆滤波器复原的原理,是利用已知复原图象和噪声,通过退化函数,经过反傅立叶变换,求出原始图象。同时以Visual C++ 6.0为开发工具,讨论了实现逆滤波复原函数的部分程序。最后给出了对一幅图像进行卷积模糊操作和逆滤波复原的示例。展开更多
Electrophoretic display(EPD) technology has become one of the main supporting pillars of the electronic paper display industry.Despite its benefits,the EPD technology suffers from several disadvantages such as non-fix...Electrophoretic display(EPD) technology has become one of the main supporting pillars of the electronic paper display industry.Despite its benefits,the EPD technology suffers from several disadvantages such as non-fixed threshold voltage value for gray scale display.In addition,the display has to repeatedly refresh between white and black states to eliminate ghost image when it needs to update a new image.The traditional driving waveform for the EPD includes four stages: erasing the original image,resetting to black state,clearing to white state,and writing a new image.A flicker can be found when transferring between two adjacent stages.A new driving waveform based on the improvement of activation pattern is proposed to weaken the ghost image and reduce the flicker.Experimental results show that the proposed driving waveform could weaken the ghost image effectively and reduce the number of flickers by 50%.Compared with the traditional driving waveform,the driving waveform of this work has a better performance.展开更多
A novel cast shadow detection approach was proposed.A stereo vision system was used to capture images instead of traditional single camera.It was based on an assumption that cast shadows were on a special plane.The im...A novel cast shadow detection approach was proposed.A stereo vision system was used to capture images instead of traditional single camera.It was based on an assumption that cast shadows were on a special plane.The image obtained from one camera was inversely projected to the plane and then transformed to the view from another camera.The points on the plane shared the same position between original image and the transformed image.As a result,the cast shadows can be detected.In order to improve the efficiency of cast shadow detection and decrease computational complexity,the obvious object areas in CIELAB color space were removed and the potential shadow areas were obtained.Experimental results demonstrate that the proposed approach can detect cast shadows accurately even under various illuminations.展开更多
文摘图像复原是利用退化现象的某种先验知识(退化模型),按退化的逆过程重建图像的技术。其退化模型是原始图像经过算子,或系统经退化因素作用之后和噪声叠加,以形成退化后的图像,即实际得到的图像。逆滤波器复原的原理,是利用已知复原图象和噪声,通过退化函数,经过反傅立叶变换,求出原始图象。同时以Visual C++ 6.0为开发工具,讨论了实现逆滤波复原函数的部分程序。最后给出了对一幅图像进行卷积模糊操作和逆滤波复原的示例。
基金Project(2011D039)supported by Guangdong Innovative Research Team Program,China
文摘Electrophoretic display(EPD) technology has become one of the main supporting pillars of the electronic paper display industry.Despite its benefits,the EPD technology suffers from several disadvantages such as non-fixed threshold voltage value for gray scale display.In addition,the display has to repeatedly refresh between white and black states to eliminate ghost image when it needs to update a new image.The traditional driving waveform for the EPD includes four stages: erasing the original image,resetting to black state,clearing to white state,and writing a new image.A flicker can be found when transferring between two adjacent stages.A new driving waveform based on the improvement of activation pattern is proposed to weaken the ghost image and reduce the flicker.Experimental results show that the proposed driving waveform could weaken the ghost image effectively and reduce the number of flickers by 50%.Compared with the traditional driving waveform,the driving waveform of this work has a better performance.
基金Project(40971219)supported by the Natural Science Foundation of ChinaProjects(201121202020005,T201221207)supported by the Fundamental Research Fund for the Central Universities,China
文摘A novel cast shadow detection approach was proposed.A stereo vision system was used to capture images instead of traditional single camera.It was based on an assumption that cast shadows were on a special plane.The image obtained from one camera was inversely projected to the plane and then transformed to the view from another camera.The points on the plane shared the same position between original image and the transformed image.As a result,the cast shadows can be detected.In order to improve the efficiency of cast shadow detection and decrease computational complexity,the obvious object areas in CIELAB color space were removed and the potential shadow areas were obtained.Experimental results demonstrate that the proposed approach can detect cast shadows accurately even under various illuminations.
