方法:基于CiteSpace绘制知识图谱功能,采用Web of Science和中国知网数据库作为文献检索源。目的:梳理分析2012—2022年间国内外景观特征评价相关文献。结果:(1)在研究对象方面,中外景观特征评价研究愈加丰富,研究视角逐渐多元化,总体...方法:基于CiteSpace绘制知识图谱功能,采用Web of Science和中国知网数据库作为文献检索源。目的:梳理分析2012—2022年间国内外景观特征评价相关文献。结果:(1)在研究对象方面,中外景观特征评价研究愈加丰富,研究视角逐渐多元化,总体表现出由宏观向微观、由环境背景向注重自身体质升级研究变化。(2)国外学者常采用多学科交叉融合;国内学者则较多从地方尺度探索,较少从区域尺度开展研究,而国家尺度几乎为零。(3)国外研究侧重于采用定量、定性或混合性方法的标准研究范式进行研究,国内早期研究主要借鉴英国对景观特征的评价方法。总体上核心期刊的发文占比较低,发文质量有待提升,研究范式还需进一步规范。展开更多
Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrate...Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrated by using of the camera’s projective center and the light’s information in the camera’s image surface. Without striction to the movement of the coplanar reference target and assistant adjustment equipment, this calibration method can be implemented. This method has been used and decreased the cost of calibration equipment, simplified the calibration procedure, improved calibration efficiency. Using experiment, the sensor can attain relative accuracy about 0.5%, which indicates the rationality and effectivity of this method.展开更多
To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. ...To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the least- square algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.展开更多
文摘方法:基于CiteSpace绘制知识图谱功能,采用Web of Science和中国知网数据库作为文献检索源。目的:梳理分析2012—2022年间国内外景观特征评价相关文献。结果:(1)在研究对象方面,中外景观特征评价研究愈加丰富,研究视角逐渐多元化,总体表现出由宏观向微观、由环境背景向注重自身体质升级研究变化。(2)国外学者常采用多学科交叉融合;国内学者则较多从地方尺度探索,较少从区域尺度开展研究,而国家尺度几乎为零。(3)国外研究侧重于采用定量、定性或混合性方法的标准研究范式进行研究,国内早期研究主要借鉴英国对景观特征的评价方法。总体上核心期刊的发文占比较低,发文质量有待提升,研究范式还需进一步规范。
文摘Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrated by using of the camera’s projective center and the light’s information in the camera’s image surface. Without striction to the movement of the coplanar reference target and assistant adjustment equipment, this calibration method can be implemented. This method has been used and decreased the cost of calibration equipment, simplified the calibration procedure, improved calibration efficiency. Using experiment, the sensor can attain relative accuracy about 0.5%, which indicates the rationality and effectivity of this method.
基金This work has been supported by the Special Funds of NationalNatural Science Funds of China ( No. 50327501)the MajorProject of Natural Science Fundation of Tianjin in China[05YFJZJC01700]
文摘To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the least- square algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.
