摘要
基于光学外差扫描全息术 3D成像的基本原理和编码孔径成像技术 ,设计了用于正在研制的“近红外扫描全息光学层析成像系统”中的编码孔径和解码孔径。当编码函数非负时 ,设计能取正负值的解码函数可以改善系统的点扩散函数 ,使其更接近于理想的二维 δ函数。在点扩散函数分布中的均匀或起伏较小的背景将降低重建图像的对比度。计算机模拟结果表明 ,采用对比度增强技术可以减少菲涅耳波带板和非冗余小孔阵列编码孔径重建图像的背景噪音 。
The coded aperture and decoded aperture used for the near-infrared optically tomographic imaging system of scanning holography are designed.The designing is based on the principle of optical heterodyne scanning holography and the technique of coded aperture imaging.The decoded function with both positive and negative values can improve the system point spread function if the coded function is not negative.The oscillated background with small amplitudes of the system point spread function spoils the contrast of reconstructed images.The computer simulation results demonstrate that the background noises of the reconstruction can be reduced by means of the technique of contrast enhancement.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2004年第3期321-324,共4页
Chinese Journal of Scientific Instrument
基金
广东威尔医学科技股份有限公司资助
