目的为了实现存在纵向错位和亮度差异的彩色全景图的拼接,提出一种基于HSV颜色空间的全景图拼接技术。方法提出了一种可变特征向量匹配算法,并且结合重叠区域对应特征匹配向量相关系数最大准则遍历搜寻对应的特征匹配向量,从而找到相邻...目的为了实现存在纵向错位和亮度差异的彩色全景图的拼接,提出一种基于HSV颜色空间的全景图拼接技术。方法提出了一种可变特征向量匹配算法,并且结合重叠区域对应特征匹配向量相关系数最大准则遍历搜寻对应的特征匹配向量,从而找到相邻子图的重叠区域,通过加权模板对重叠区域进行加权融合实现拼接。结果新算法对全景图的拼接效果优于常规算法,拼接质量Do EM值为0.999 d B,拼接平均耗时为499 ms,融合区域有渐进渐出的效果,有效解决了拼接错位和亮度突变问题。结论该算法对彩色全景图的拼接具有很好的适应性和可重复性,对子图的大小和颜色无严格要求。不仅拼接速度快,而且拼接精度高,是一套完整地针对存在纵向错位和亮度差异的彩色全景图的全自动拼接方案。展开更多
A novel ghost imaging-based optical cryptosystem for multiple images using the integral property of the Fourier transform is proposed.Different from other multiple-image encryption schemes,we mainly construct the modu...A novel ghost imaging-based optical cryptosystem for multiple images using the integral property of the Fourier transform is proposed.Different from other multiple-image encryption schemes,we mainly construct the modulation patterns related to the plaintext images to realize the encrypted transmission of multiple images.In encryption process,the first image is encrypted by the ghost imaging encryption scheme,and the intensity sequence obtained by the bucket detector is used as the ciphertext.Then modulation patterns of other images are constructed by using the integral property of the Fourier transform and used as the keys.Finally,the ciphertext and keys are transmitted to the receiver to complete the encryption process.During decryption,the receiver uses different keys to decrypt the ciphertext and gets different plaintext images,and decrypted images have no image aliasing problem.Experiments and simulations verify the feasibility,security,and robustness of the proposed scheme.This scheme has high scalability and broad application prospect,which provides a new idea for optical information encryption.展开更多
This study provides a rapid method for quantification of mineral oil in rapeseed oil using near-infrared spectroscopy.The data were processed by direct orthogonal signal correction(DOSC),successive projections algorit...This study provides a rapid method for quantification of mineral oil in rapeseed oil using near-infrared spectroscopy.The data were processed by direct orthogonal signal correction(DOSC),successive projections algorithm(SPA),partial least squares,and principal component regression(PCR).Good correlation coefficients(R)of 0.998 and root-mean-squared error(RMSE)of 0.005 were obtained,and the DOSC-SPA-PCR model was identified as the optimal method.A satisfactory accuracy with R and RMSE of prediction by DOSC-SPA-PCR of 0.990 and 0.006,was obtained.The results demonstrate that the proposed methodology is a promising method for the rapid quantitative detection of mineral oil in vegetable oil.展开更多
文摘目的为了实现存在纵向错位和亮度差异的彩色全景图的拼接,提出一种基于HSV颜色空间的全景图拼接技术。方法提出了一种可变特征向量匹配算法,并且结合重叠区域对应特征匹配向量相关系数最大准则遍历搜寻对应的特征匹配向量,从而找到相邻子图的重叠区域,通过加权模板对重叠区域进行加权融合实现拼接。结果新算法对全景图的拼接效果优于常规算法,拼接质量Do EM值为0.999 d B,拼接平均耗时为499 ms,融合区域有渐进渐出的效果,有效解决了拼接错位和亮度突变问题。结论该算法对彩色全景图的拼接具有很好的适应性和可重复性,对子图的大小和颜色无严格要求。不仅拼接速度快,而且拼接精度高,是一套完整地针对存在纵向错位和亮度差异的彩色全景图的全自动拼接方案。
基金Project supported by the Natural Science Foundation of Shanghai,China(Grant No.18ZR1425800)the National Natural Science Foundation of China(Grant Nos.61875125 and 61775140)。
文摘A novel ghost imaging-based optical cryptosystem for multiple images using the integral property of the Fourier transform is proposed.Different from other multiple-image encryption schemes,we mainly construct the modulation patterns related to the plaintext images to realize the encrypted transmission of multiple images.In encryption process,the first image is encrypted by the ghost imaging encryption scheme,and the intensity sequence obtained by the bucket detector is used as the ciphertext.Then modulation patterns of other images are constructed by using the integral property of the Fourier transform and used as the keys.Finally,the ciphertext and keys are transmitted to the receiver to complete the encryption process.During decryption,the receiver uses different keys to decrypt the ciphertext and gets different plaintext images,and decrypted images have no image aliasing problem.Experiments and simulations verify the feasibility,security,and robustness of the proposed scheme.This scheme has high scalability and broad application prospect,which provides a new idea for optical information encryption.
基金partially supported by the National Natural Science Foundation of China(NSFC)(No.61775140)。
文摘This study provides a rapid method for quantification of mineral oil in rapeseed oil using near-infrared spectroscopy.The data were processed by direct orthogonal signal correction(DOSC),successive projections algorithm(SPA),partial least squares,and principal component regression(PCR).Good correlation coefficients(R)of 0.998 and root-mean-squared error(RMSE)of 0.005 were obtained,and the DOSC-SPA-PCR model was identified as the optimal method.A satisfactory accuracy with R and RMSE of prediction by DOSC-SPA-PCR of 0.990 and 0.006,was obtained.The results demonstrate that the proposed methodology is a promising method for the rapid quantitative detection of mineral oil in vegetable oil.
