Design of a Tree Ring Structure Analysis System to Estimate the Accurate Age of Tree Species in Sri Lanka

Determination of an age in a particular tree species can be considered as a vital factor in forest management. In this research we have introduced a novel scheme to determine the accurate age of the tree species in Sri Lanka. This is initially developed for the tree species called‘Hora’ (Dipterocarpus zeylanicus ) in wet zone of Sri Lanka. Here the core samples are extracted and further analyzed by means of the different image processing techniques such as Gaussian kernel blurring, use of Sobel filters, double threshold analysis ,Hough line transformation and etc. The operations such as rescaling, slicing and measuring are also used in line with image processing techniques to achieve the desired results. Ultimately a Graphical user interface (GUI) is developed to cater for the user requirements in a user friendly envi-ronment. It has been found that the average growth ring identification accuracy of the proposed system is 93% and the overall average accuracy of detecting the age is 81%. Ultimately the proposed system will provide an insight and contributes to the forestry related activities and researches in Sri Lanka.     

拟实环境辅助微操作工具Z方向定位研究

针对微操作系统中微操作工具相对于被操作对象Z方向精确定位难问题,提出了利用拟实环境辅助定位的方法,将定位问题转化为如何确定模糊图像模糊度问题。首先在拟实环境中精确定位,在实际操作中由高精度步进电机直接驱动操作臂使微操作工具到达被操作对象所处焦平面,既克服了“爬山”现象对定位精度的影响,又不受物镜景深的限制。     

Cognitive processes in complex tasks: introduction and discussion

This paper points out that the fusional limits of binocular stereoscopic viewing are an important factor, not only determining the reproduction range of stereoscopic images, but also the conformity between the stereoscopic display and stereoscopic vision. Experimental results showed that fusional limits increase in proportion to the field of view angle, and that they are affected not only by the size of the viewing target, but also by the effects that the environment has on the target. These findings explain the differences between binocular vision in real space and binocular vision in a stereoscopic display. Finally, the conditions under which observers arc able to view images of stereoscopic displays without excessive visual strain are discussed.     

VB编程中的几个小技巧

利用VB中的InStr函数、Like运算来实现数据的模糊查找,以及利用随机码进行加密.     

基于虚拟显微镜技术的微操作工具Z方向定位方法研究

在前期研究工作的基础上提出了在微操作的拟实环境中基于虚拟显微镜技术用“试探法”求解微操作工具Z方向高精度定位问题,并针对其三个关键点－确定合理的模糊度判据、噪声处理、确定定位部位,进行了理论分析和实验验证,证明了该方法是可行的。     

用自定义图案对彩色图象二值化处理

研究了Photoshop抖动处理的原理与过程,巧妙定义二值图案,然后对此二值图案进行模糊化处理,使彩色图象变成了一幅由自定义图案所组成的二值化图象。     

微操作显微图像中对象深度信息判据

通过对显微图像进行三维数据场分析和空间特性分析 ,定义了三个模糊度判据——有效像素数、梯度和、幅度谱和。经实验比较 ,由于幅度谱和具有较强的抗干扰能力而可作为显微图像中对象深度信息的有效判据     

Consideration of illumination effects and optimization of window size for accurate calculation of depth map for 3D shape recovery

Obtaining an accurate and precise depth map is the ultimate goal for 3D shape recovery. For depth map estimation, one of the most vital parts is the initial selection of the focus measure and processing the images with the selected focus measure. Although, many focus measures have been proposed in the literature but not much attention has been paid to the factors affecting those focus measures as well as the manner the images are processed with those focus measures. In this paper, for accurate calculation of depth map, we consider the effects of illumination on the depth map as well as the selection of the window size for application of the focus measures. The resulting depth map can further be used in techniques and algorithms leading to recovery of three-dimensional structure of the object which is required in many high-level vision applications. It is shown that the illumination effects can directly result in incorrect estimation of depth map if proper window size is not selected during focus measure computation. Further, it is shown that the images need some kind of pre-processing to enhance the dark regions and shadows in the image. For this purpose, an adaptive enhancement algorithm is proposed for pre-processing. In this paper, we prove that without such pre-processing for image enhancement and without the use of proper window size for the estimation of depth maps, it is not possible to obtain the accurate depth map.     

纹理模糊的图像分割

传统活动轮廓分割算法对纹理丰富的图像存在过分割和欠分割现象,为了抑制纹理对图像分割的影响,本文分析了各向同性和异性扩散的机理,设计了保边纹理模糊函数,以图像梯度为变量建立了全变分图像纹理模糊模型。根据对象轮廓与边缘之间的关系利用固定点迭代算法分析相应的卡通分量,对卡通分量运用水平集算法对图像进行分割。实验结果表明,本文设计的模糊函数模糊了图像纹理,保护了对象轮廓。相对于传统CV分割算法,本文分割算法抑制了纹理对图像分割的影响,弥补了传统CV的不足。     

基于频谱图分析的PSF自动获取方法

运动模糊图像恢复讨论的是对运动物体所拍摄的模糊图像进行精确恢复,恢复的关键在于精确获取点扩展函数的参数。本文提出了一种点扩展函数自动获取方法,该方法通过计算机分析运动模糊图像频谱图,能够自动获取点扩展函数的运动方向和模糊长度,避免了人机交互的繁琐和不准确。通过实验仿真并与其他点扩展函数的参数获取方法做比较,验证了该方法的准确性和实用性。