论文部分内容阅读
向量作为数学工具处理问题,把平面和空间结构代数化,使几何问题研究从"定性"提升到"定量"。但是由于课本内容编写的局限性,向量知识作为工具作用的重要性未能得到充分体现,如何充分使用向量工具,课本涉及较少,从而导致学生对向
学习向量知识的若干注意点
【摘 要】
：
向量作为数学工具处理问题,把平面和空间结构代数化,使几何问题研究从"定性"提升到"定量"。但是由于课本内容编写的局限性,向量知识作为工具作用的重要性未能得到充分体现,如何充分使用向量工具,课本涉及较少,从而导致学生对向
【出 处】
：
才智
【发表日期】
：
2008年16期
其他文献
SAR图像固有的乘性相干斑噪声降低了图像的相关性,增加了信息熵,影响了图像压缩的性能。多小波能够同时拥有正交性、紧支性和对称性,比单小波具有更多的自由度。因此提出了在多小波域进行去噪和压缩相结合的SAR图像编码算法。首先对图像进行多小波变换,采用改进的软阈值法抑制相干斑噪声同时对图像边缘进行保护,再对多小波系数重排建立空间方向树,然后采用多级树集合划分(SPIHT)算法进行编码。实验结果表明,该算
期刊
利用最大熵多阈值方法对三维大脑数据进行分割时,穷尽搜索法耗时长,而简单遗传算法的搜索结果又不够稳定和精确。针对该问题,提出了一种免疫遗传和模拟退火相结合的新算法来快速求解全局最大熵。与简单遗传算法相比,免疫遗传算法采用了更佳的选择操作,以确保更多不同个体被选择来保存种群的多样性,而模拟退火机制用于拉伸免疫遗传算法的适应度函数。算法给出了选择概率的一般表达式,并采用精英策略和自适应的交叉、变异机制以
期刊
Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT
Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules(SPNs).Methods Forty-four SPN
期刊
Research of the image processing in dynamic flatness detection based on improved laser triangular me
As a commonly used non-contact flatness detection method, laser triangular detection method is designed with low cost, but it cannot avoid measurement errors caused by strip steel vibration effectivel
期刊
For reconstructing a freeform feature from point cloud, a deformation-based method is proposed in this paper. The freeform feature consists of a secondary surface and a blending surface. The secondary
期刊
Recently,some research efforts have shown that face images possibly reside on a nonlinear sub-manifold.Though Laplacianfaces method considered the manifold structures of the face images,it has limits
期刊
In this paper,an orthogonal-directional forward diffusion Partial Differential Equation(PDE) image inpainting and denoising model which processes image based on variation problem is proposed.The novel
期刊
A simple and adaptive lossless compression algorithm is proposed for remote sensing image compression,which includes integer wavelet transform and the Rice entropy coder.By analyzing the probability d
期刊
Lyra Research,Inc.provides market,product,and technology information and analysis focused on the imaging industry.The company provides targeted information on printers and copiers,digital photography,
期刊
结合指纹细节和纹理特征给出了一种分级指纹特征表述和提取方法,先基于细节特征建立初始特征,然后根据各细节点周围的纹理特性,使用Gabor滤波器产生圆形纹理编码,一旦细节特征匹配失败,可利用其进行二次匹配。通过实验验证,该方法有效的提高了识别速度和识别率。
期刊