The objective assessment of fabric pilling based on light projection and image analysis has been exploited recently.The device for capturing the cross-sectional images of the pilled fabrics with light projection is el...The objective assessment of fabric pilling based on light projection and image analysis has been exploited recently.The device for capturing the cross-sectional images of the pilled fabrics with light projection is elaborated.The detection of the profile line and integration of the sequential cross-sectional pilled image are discussed.The threshold based on Gaussian model is recommended for pill segmentation.The results show that the installed system is capable of eliminating the interference with pill information from the fabric color and pattern.展开更多
A new instrument based on light projection and image analysis techniques for assessing fabric pilling is presented. This system can automatically detect the pills from the successive sections of the fabric surface, wh...A new instrument based on light projection and image analysis techniques for assessing fabric pilling is presented. This system can automatically detect the pills from the successive sections of the fabric surface, which can make up for the limitation of both the gray level image -analysis techniques and laser triangulab’on techniques. The test of a large number of worsted wool fabric samples shows that it can objectively characterize the degree of pilling by using fuzzy sets and has good accordance with human visual inspection.展开更多
On November 16, the light alloy precision die-casting project （Phase I） constructed by Chaohu Yi＇an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive com...On November 16, the light alloy precision die-casting project （Phase I） constructed by Chaohu Yi＇an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive components, 5G product components and laptop shells. Chaohu Yi＇an Yunhai Technology Co., Ltd. is a joint venture funded by Dongguan Yi＇an Technology Co., Ltd. and Nanjing Yunhai Special Metals Co., Ltd., with a total investment of CNY 550 million and a building area of 75,000 square meters.展开更多
A fast 3D reconstruction method based on structured light to measure various parameters of the raceway groove is presented. Digital parallel grating stripes distributed with sine density are projected onto the raceway...A fast 3D reconstruction method based on structured light to measure various parameters of the raceway groove is presented. Digital parallel grating stripes distributed with sine density are projected onto the raceway groove by a DLP projector, and distorting of stripes is happened on the raceway. Simultaneously, aided by three-step phase-shifting approach, three images covered by different stripes are obtained by a high-resolution CCD camera at the same location, thus a more accuracy local topography can be obtained. And then the bearing is rotated on a high precision computer controlled rotational stage. Three images are also obtained as the former step at next planned location triggered by the motor. After one cycle, all images information is combined through the mosaics. As a result, the 3D information of raceway groove can be gained. Not only geometric properties but also surface flaws can be extracted by software. A preliminary hardware system has been built, with which some geometric parameters have been extracted from reconstructed local topography.展开更多
Using the amorphous silicon (a-Si:H) film, which is cheap and has a small time lag, as the photoconductive layer of the liquid crystal light valve(LCLV) is an ideal selection. With the method of impedance matching use...Using the amorphous silicon (a-Si:H) film, which is cheap and has a small time lag, as the photoconductive layer of the liquid crystal light valve(LCLV) is an ideal selection. With the method of impedance matching used, we have designed and fabricated an a-Si:H LCLV and have obtained a clear image on a large screen projection system. The resolution of the valve was 20 lp/mm. The sensitometry measurement showed that the projection light level varies linearly with the writing light level when the latter is below 100 μW/cm2. The measurement of the transient response at the writing light level of 100 μW/cm2 indicated that the rise time and the decay time were 60 ms and 80 ms, respectively.展开更多
基金This research was supported by the Research Fund for Etoctoral Program of Higher Education (No. 99025508)
文摘The objective assessment of fabric pilling based on light projection and image analysis has been exploited recently.The device for capturing the cross-sectional images of the pilled fabrics with light projection is elaborated.The detection of the profile line and integration of the sequential cross-sectional pilled image are discussed.The threshold based on Gaussian model is recommended for pill segmentation.The results show that the installed system is capable of eliminating the interference with pill information from the fabric color and pattern.
文摘A new instrument based on light projection and image analysis techniques for assessing fabric pilling is presented. This system can automatically detect the pills from the successive sections of the fabric surface, which can make up for the limitation of both the gray level image -analysis techniques and laser triangulab’on techniques. The test of a large number of worsted wool fabric samples shows that it can objectively characterize the degree of pilling by using fuzzy sets and has good accordance with human visual inspection.
文摘On November 16, the light alloy precision die-casting project （Phase I） constructed by Chaohu Yi＇an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive components, 5G product components and laptop shells. Chaohu Yi＇an Yunhai Technology Co., Ltd. is a joint venture funded by Dongguan Yi＇an Technology Co., Ltd. and Nanjing Yunhai Special Metals Co., Ltd., with a total investment of CNY 550 million and a building area of 75,000 square meters.
基金This project is supported by National Natural Science Foundation ofChina (No.50375047).
文摘A fast 3D reconstruction method based on structured light to measure various parameters of the raceway groove is presented. Digital parallel grating stripes distributed with sine density are projected onto the raceway groove by a DLP projector, and distorting of stripes is happened on the raceway. Simultaneously, aided by three-step phase-shifting approach, three images covered by different stripes are obtained by a high-resolution CCD camera at the same location, thus a more accuracy local topography can be obtained. And then the bearing is rotated on a high precision computer controlled rotational stage. Three images are also obtained as the former step at next planned location triggered by the motor. After one cycle, all images information is combined through the mosaics. As a result, the 3D information of raceway groove can be gained. Not only geometric properties but also surface flaws can be extracted by software. A preliminary hardware system has been built, with which some geometric parameters have been extracted from reconstructed local topography.
基金Supported by the National Science Foundation of China
文摘Using the amorphous silicon (a-Si:H) film, which is cheap and has a small time lag, as the photoconductive layer of the liquid crystal light valve(LCLV) is an ideal selection. With the method of impedance matching used, we have designed and fabricated an a-Si:H LCLV and have obtained a clear image on a large screen projection system. The resolution of the valve was 20 lp/mm. The sensitometry measurement showed that the projection light level varies linearly with the writing light level when the latter is below 100 μW/cm2. The measurement of the transient response at the writing light level of 100 μW/cm2 indicated that the rise time and the decay time were 60 ms and 80 ms, respectively.
