Animals have evolved a variety of behavior patterns to adapt to the environment. Motion-capture technology is utilized to quantify and characterize locomotor behaviors to reveal the mechanisms of animal motion. In the...Animals have evolved a variety of behavior patterns to adapt to the environment. Motion-capture technology is utilized to quantify and characterize locomotor behaviors to reveal the mechanisms of animal motion. In the capture of flexible, small animals with complex locomotor behaviors, the markers interfere with each other easily, and the motion forms(bending, twisting) of the moving parts are obviously different;thus, it is a great challenge to realize accurate quantitative characterization of complex locomotor behaviors. The correlation between the marker properties, including the size and space length, and the precision of the system are revealed in this paper, and the effects of diverse marker shapes on the capturing accuracy of the captured objects in different motion forms were tested. Results showed that the precision of system is significantly improved when the ratio of the space length to the diameter of the markers is larger than four;for the capture of the spatial twisting motion of the flexible object, the hexagon markers had the lowest spatial lost-marker rate relative to the circle, triangle, and square. Customized markers were used to capture the locomotor behavior of the gecko-inspired robot(rigid connection) and the gecko(flexible connection). The results showed that this marking technology can achieve high accuracy of motion capture for geckos(the average deviation was approximately 0.32 mm, and the average deviation’s variation rate was approximately 0.96%). In this paper, the marking technology for the motion capture of flexible, small animals with complex motion is proposed;it can effectively improve the system precision as well as the capture accuracy, and realize the quantitative characterization of the complex motion of flexible, small objects. It provides a reliable technical means to deeply study the evolution of the motion function of small animals and advance systematic research of motion-capture technology.展开更多
This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution a...This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution and detection efficiency in comparison with a parallel-hole collimator. The theory of imaging characteristics of the pin- hole collimator is presented and the designs of the pinhole aperture are discussed. The detector technologies used for the development of small-animal SPECT and the recent advances are presented. The evolving trend of small-animal SPECT is toward a multi-pinhole and a multi-detector system to obtain a high resolution and also a high detection ef- ficiency.展开更多
An image multi-scale edge detection method based on anti-symmetrical bi-orthogonal wavelet is given in theory. Convolution operation property and function as a differential operator are analyzed,which anti-symmetrical...An image multi-scale edge detection method based on anti-symmetrical bi-orthogonal wavelet is given in theory. Convolution operation property and function as a differential operator are analyzed,which anti-symmetrical bi-orthogonal wavelet transform have. An algorithm for wavelet reconstruction in which multi-scale edge can be detected is put forward. Based on it, a detection method for small target in infrared image with sea or sky background based on the anti-symmetrical bi-orthogonal wavelet and morphology is proposed. The small target detection is considered as a process in which structural background is removed, correlative background is suppressed, and noise is restrained. In this approach, the multi-scale edge is extracted by means of the anti-symmetrical bi-orthogonal wavelet decomposition. Then, module maximum chains formed by complicated background of clouds, sea wave and sea-sky-line are removed, and the image background becomes smoother. Finally, the morphology based edge detection method is used to get small target and restrain undulate background and noise. Experiment results show that the approach can suppress clutter background and detect the small target effectively.展开更多
The purpose of this study is to introduce a novel empirical iterative algorithm for medical image reconstruction, under the short name MRP-ISWLS (Median Root Prior Image Space Weighted Least Squares). Further, we asse...The purpose of this study is to introduce a novel empirical iterative algorithm for medical image reconstruction, under the short name MRP-ISWLS (Median Root Prior Image Space Weighted Least Squares). Further, we assess the performance of the new algorithm by comparing it to the simultaneous version of known MRP algorithms. All algorithms are compared in terms of cross-correlation and CNRs (Contrast-to-Noise Ratios). As it turns out, MRP-ISWLS presents higher CNRs than the known algorithms for objects of different size. Also MRP-ISWLS has better noise manipulation.展开更多
In order to realize omnidirectional real-time detection and awareness in thermal infrared (IR) region,a kind of biomimetic miniature IR imaging detection system (BMIRIDS) has been successfully developed.It is classifi...In order to realize omnidirectional real-time detection and awareness in thermal infrared (IR) region,a kind of biomimetic miniature IR imaging detection system (BMIRIDS) has been successfully developed.It is classified as a long wave IR(LWIR) system and a mid-wave IR(MWIR) one.The former consists of a LWIR fish-eye lens and a LWIR focal plane array (FPA)-biomimetic electronic module,the latter consists of a MWIR fish-eye lens and a MWIR FPA-biomimetic electronic module.Both can provide complete hemispherical staring field of view,and have the capability to determine target bearings,to remove all stationary scene clutter and only detect moving targets,to sense targets range and their velocity.The capability closely approximates the vision process performed in nature by biological sensors.Furthermore,an additional biomimetic module block has been integrated into BMIRIDS.The module block imitating the function of human vision produces the logarithmic brightness image,and enhances the target image outline by virtue of the Roberts gradient difference.The logarithmic transform permits expanding the dynamic range of optical incidence without saturating the electric circuit,and makes the image more suitable for watching.DSP and FPGA perform the aforesaid vision functions that are advantageous to detect and track targets.Therefore,BMIRIDS can perform more powerful real-time signal and image processing on the resulting image data than the ordinary previous systems mainly by the aid of "software-only" processing.Because BMIRIDS has a 2π-steradian (sr.) staring field-of-view,two of such systems opposed to one another would provide a complete view of space around the sensor platform.In addition,its low power consumption makes itself meet the manifold platforms' needs.The practice has proved that BMIRIDS can truly realize "omnidirectional" "real-time" situation awareness and dynamic information acquirement.By virtue of biomimetic technology,some limitations of the current photoelectric equipment have been broken and a new type of IR equipment has been developed.展开更多
基金funded by the National Natural Science Foundation of China (Grant Nos. 31601870 and 51435008)Natural Science Foundation of Jiangsu Province, China (Grant No. SBK20160800 to Zhouyi WANG)Jiangsu Provincial Key Laboratory of Bionic Functional Materials
文摘Animals have evolved a variety of behavior patterns to adapt to the environment. Motion-capture technology is utilized to quantify and characterize locomotor behaviors to reveal the mechanisms of animal motion. In the capture of flexible, small animals with complex locomotor behaviors, the markers interfere with each other easily, and the motion forms(bending, twisting) of the moving parts are obviously different;thus, it is a great challenge to realize accurate quantitative characterization of complex locomotor behaviors. The correlation between the marker properties, including the size and space length, and the precision of the system are revealed in this paper, and the effects of diverse marker shapes on the capturing accuracy of the captured objects in different motion forms were tested. Results showed that the precision of system is significantly improved when the ratio of the space length to the diameter of the markers is larger than four;for the capture of the spatial twisting motion of the flexible object, the hexagon markers had the lowest spatial lost-marker rate relative to the circle, triangle, and square. Customized markers were used to capture the locomotor behavior of the gecko-inspired robot(rigid connection) and the gecko(flexible connection). The results showed that this marking technology can achieve high accuracy of motion capture for geckos(the average deviation was approximately 0.32 mm, and the average deviation’s variation rate was approximately 0.96%). In this paper, the marking technology for the motion capture of flexible, small animals with complex motion is proposed;it can effectively improve the system precision as well as the capture accuracy, and realize the quantitative characterization of the complex motion of flexible, small objects. It provides a reliable technical means to deeply study the evolution of the motion function of small animals and advance systematic research of motion-capture technology.
文摘This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution and detection efficiency in comparison with a parallel-hole collimator. The theory of imaging characteristics of the pin- hole collimator is presented and the designs of the pinhole aperture are discussed. The detector technologies used for the development of small-animal SPECT and the recent advances are presented. The evolving trend of small-animal SPECT is toward a multi-pinhole and a multi-detector system to obtain a high resolution and also a high detection ef- ficiency.
基金Sponsored by China Postdoctoral Science Foundation (20060400400)
文摘An image multi-scale edge detection method based on anti-symmetrical bi-orthogonal wavelet is given in theory. Convolution operation property and function as a differential operator are analyzed,which anti-symmetrical bi-orthogonal wavelet transform have. An algorithm for wavelet reconstruction in which multi-scale edge can be detected is put forward. Based on it, a detection method for small target in infrared image with sea or sky background based on the anti-symmetrical bi-orthogonal wavelet and morphology is proposed. The small target detection is considered as a process in which structural background is removed, correlative background is suppressed, and noise is restrained. In this approach, the multi-scale edge is extracted by means of the anti-symmetrical bi-orthogonal wavelet decomposition. Then, module maximum chains formed by complicated background of clouds, sea wave and sea-sky-line are removed, and the image background becomes smoother. Finally, the morphology based edge detection method is used to get small target and restrain undulate background and noise. Experiment results show that the approach can suppress clutter background and detect the small target effectively.
文摘The purpose of this study is to introduce a novel empirical iterative algorithm for medical image reconstruction, under the short name MRP-ISWLS (Median Root Prior Image Space Weighted Least Squares). Further, we assess the performance of the new algorithm by comparing it to the simultaneous version of known MRP algorithms. All algorithms are compared in terms of cross-correlation and CNRs (Contrast-to-Noise Ratios). As it turns out, MRP-ISWLS presents higher CNRs than the known algorithms for objects of different size. Also MRP-ISWLS has better noise manipulation.
基金supported by the National High-Tech Research & Development Program of China
文摘In order to realize omnidirectional real-time detection and awareness in thermal infrared (IR) region,a kind of biomimetic miniature IR imaging detection system (BMIRIDS) has been successfully developed.It is classified as a long wave IR(LWIR) system and a mid-wave IR(MWIR) one.The former consists of a LWIR fish-eye lens and a LWIR focal plane array (FPA)-biomimetic electronic module,the latter consists of a MWIR fish-eye lens and a MWIR FPA-biomimetic electronic module.Both can provide complete hemispherical staring field of view,and have the capability to determine target bearings,to remove all stationary scene clutter and only detect moving targets,to sense targets range and their velocity.The capability closely approximates the vision process performed in nature by biological sensors.Furthermore,an additional biomimetic module block has been integrated into BMIRIDS.The module block imitating the function of human vision produces the logarithmic brightness image,and enhances the target image outline by virtue of the Roberts gradient difference.The logarithmic transform permits expanding the dynamic range of optical incidence without saturating the electric circuit,and makes the image more suitable for watching.DSP and FPGA perform the aforesaid vision functions that are advantageous to detect and track targets.Therefore,BMIRIDS can perform more powerful real-time signal and image processing on the resulting image data than the ordinary previous systems mainly by the aid of "software-only" processing.Because BMIRIDS has a 2π-steradian (sr.) staring field-of-view,two of such systems opposed to one another would provide a complete view of space around the sensor platform.In addition,its low power consumption makes itself meet the manifold platforms' needs.The practice has proved that BMIRIDS can truly realize "omnidirectional" "real-time" situation awareness and dynamic information acquirement.By virtue of biomimetic technology,some limitations of the current photoelectric equipment have been broken and a new type of IR equipment has been developed.
