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排序方式: 共有68条查询结果,搜索用时 31 毫秒
1.
基于DCT的人脸识别算法在嵌入式系统的并行实现* 总被引:1,自引:0,他引:1
应用双DSP即TMS320C6201的并行体系结构完成了对人脸识别算法的实时实现,通过这种多处理器并行系统,对CF2C算法进行合理的任务分派,系统达到了较好的实时性效果和较高的识别效率,同时系统通过ARM7最小系统,完成一些外围的控制功能,使DSP可以专注于信号处理。 相似文献
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本文介绍了Gabor-fisher classifier分类器(GFC)人脸识别方法,利用该方法首先对面部图像进行Gabor小波处理,再对得到的增广Gabor特征向量应用增强线性辨别法模型(EFM)以得到辨别特征,该方法对于人脸图像在光照和表情变化的情况下仍然是有效的.该方法的新颖之处在于:(1)引入了Gabor小波,得到的增广特征向量更好地反映了图像的特征;(2)应用EFM在对维数进行降低的同时进行分类特征提取.通过与传统的LDA方法和PCA方法的对比得出,该方法在应用于光照和面部表情变化比较大的FERET数据库时,优势比较明显. 相似文献
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Ferromagnetic stainless steels (SSs) have been investigated as potential candidates for dental prosthesis applications in replacement of magnetic attachments made of noble and expensive alloys. In order to be used as biomaterials, their corrosion resistance has to be appropriate. The corrosion resistance of passive materials is related to the characteristics of the passive film formed and their properties might be investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, and Mott–Schottky approach. The corrosion resistance and the capacitance of the passive films formed on PM2000, DIN 1.4575, and 17‐4 PH advanced SSs during 2 days of immersion in a phosphate buffered saline solution (PBS), at 25 °C and pH 7.0 were studied by electrochemical techniques. A commercial alloy Dyna EFM was also analyzed for comparison reasons. The results showed that films on tested materials behave as both n‐type and p‐type semiconductors and the PM2000 presented the highest corrosion resistance among all of them. 相似文献
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A.V. Krayev 《Polymer》2004,45(24):8195-8200
We report the applicability of Electric Force Microscopy (EFM) for the analysis of thin films of dielectric heterogeneous polymer blends constituted of polymers with both close and significantly different dielectric constants and offer a simple model that enables quantitative analysis of EFM images of such blends. 相似文献
8.
K. F. Khaled 《Journal of Applied Electrochemistry》2009,39(3):429-438
Electrochemical frequency modulation, EFM is a new technique for corrosion rate measurements. With the EFM technique, the
corrosion rate and corrosion kinetic parameters can be obtained instantaneously without prior knowledge of Tafel slopes, which
makes this method an ideal technique for application as a corrosion monitoring tool. Results obtained with the EFM technique
were shown to be in agreement with chemical (weight loss) and electrochemical methods (Tafel extrapolation and electrochemical
impedance spectroscopy, EIS) for corrosion rate measurements. New synthesized hydrazine carbodithioic acid derivatives namely,
N′-furan-2-yl-methylene-hydrazine carbodithioic acid (A), N′-(4-dimethylamino-benzylidene)-hydrazine carbodithioic acid (B) and N′-(3-nitro-benzylidene)-hydrazine carbodithioic acid (C) were examined as corrosion inhibitors for carbon steel in 1 M perchloric
acid solution. The results obtained from both chemical and electrochemical measurements show that these compounds suppressed
both anodic and cathodic processes of carbon steel corrosion in 1 M HClO4 by adsorption on the electrode surface. The adsorption mode follows the Langmuir adsorption isotherm. The efficiency of the
inhibitors increases in the order C > B > A. 相似文献
9.
扫描探针显微镜测壳聚糖材料的表面电荷分布 总被引:2,自引:0,他引:2
提出一种测量材料表面电荷是非均匀的、没有中性区的弱电荷的方法.即测试时,利用扫描探针显微镜(SPM)的静电力显微镜(EFM)测量技术,依靠轻敲模式(Tapping Mode)和抬举模式(Lift Mode),用相位成像测量有机高分子膜--壳聚糖膜(CHI)的表面电荷密度空间分布,但由于仪器设计中相位的泰勒展开是:sin△φ≈1/2△φ,所以所获的电荷图像只能确定材料的表面电荷分布和表面电荷密度的近似值.然而,嵴宽约为2.12μm表面正电荷微沟槽结构的这种特殊电荷形貌分布有利于细胞的生长,因此获得的表面电荷分布补充了生物材料表面理化性质. 相似文献
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