Wavelet-Based Mixed-Resolution Coding Approach Incorporating with SPT for the Stereo Image

ELECTRONICS TECHNOLOGY1. INTroDUCTIONThe human brain can process subtle differences between the images that are presented to the left and right eyesto perceive a three-dimensional (3-D) outside world. This ability is called stereo vision. A stereoscopic systemmay be used to stimulate the stereo vision ability edificially. A stereo pair, a pair of images of the same sceneacquired from two different perspectives, is presented to the observers so that the right image is seen by theri…     

基于DPSS的高噪声条件下混合LFM波形提取方法设计

 随着电磁对抗与反对抗技术的不断发展,低截获概率信号应用越来越广泛。传统的信号提取方法对低截获信号波形的提取已经无法满足用户使用需求。基于椭球基序列（discrete prolate spheroidal sequence,DPSS）构建时间窗函数对混合线性调频信号（multiple linear frequency modulation）进行分析,提出了恒门限判定概率捕获信号方法,并采用自适应二值化以及改进的霍夫变换（Hough transform）等图形处理算法完成信号波形的提取。仿真表明,本方法比短时傅里叶变换算法（short-time Fourier transform）具有更为优秀的噪声控制,同时在低信噪比下仍能准确提取波形。     

Expression of neurofilament gene in spinal motoneurons during neural regeneration

The techniquein situ hybridization was used to measure the levels of light (NF-L), medium (NF-M) and heavy (NF-H) neurofilament protein subunits mRNA in L_4-6 spinal motoneurons in adult rat during regeneration following a unilateral crush of the sciatic nerve. It was found that the hybridization signals of each neurofilament subunit rnRNA were dramatically decreased in spinal motoneurons postaxotomy by light microscopy. The hybridization signals of NF-L and NF-M mRNA were located in cytoplasm of neurons, whereas NF-H mRNA was found in both nucleus and cytoplasm of neurons. Image analysis showed that the encoding levels of mRNA for each of neurofilament subunit mRNA reduced on the 3rd d and returned to control levels on the 28th d following the lesion. The relative levels of mRNA coding for each neurofilament subunit were significantly different. The lowest level of NF-L mRNA was observed at 5 d postaxotomy, and that of NF-M, NF-H mRNA on the 7th and 10th d after injury. Moreover, the levels of HF-M and NF-H mRNA were reduced much lower and lasted much longer than that of NF-L mRNA. The observations suggest that there were different mechanisms for the regulation of neurofilament subunit genes expression. The reduced neurofilament gene expression may be due to a response to axonal injury and advance the restructure of axonal architecture.