CAJ | 학술논문

研究了傅里叶变换计算全息编码中相位分布和编码尺度对再现像的影响。基于罗曼Ⅲ型编码原理，用M at-lab计算得到傅里叶变换计算全息图，通过液晶光阀输出全息图实现再现，研究再现像的特征在物图加随机相位和增大编码尺度前后的变化。结果表明：物图不加随机相位的全息图，其再现像具有高通效果，实现了边缘提取；物图加随机相位，再现相当于低通滤波，再现像被平滑，当物频谱结构丰富时，平滑作用更明显，甚至无法辨识再现像；增大编码单元尺寸，即提高编码精度可使再现像清晰。
연구료부리협변환계산전식편마중상위분포화편마척도대재현상적영향。기우라만Ⅲ형편마원리，용M at-lab계산득도부리협변환계산전식도，통과액정광벌수출전식도실현재현，연구재현상적특정재물도가수궤상위화증대편마척도전후적변화。결과표명：물도불가수궤상위적전식도，기재현상구유고통효과，실현료변연제취；물도가수궤상위，재현상당우저통려파，재현상피평활，당물빈보결구봉부시，평활작용경명현，심지무법변식재현상；증대편마단원척촌，즉제고편마정도가사재현상청석。
T he influence of phase distribution and coding scale on the reconstruction of computer generated hologram was researched .Based on the Lohmann Ⅲ coding method and Matlab computing tool ,computer generated hologram (CGH) was designed and optically reconstruction using liquid crystal light valve .Changes of the reconstructed image caused by the random phase intendedly added to the original image and the increase of the coded cell size were investigated .The results showed that high-pass effect or edge extraction could be achieved for the original image with no phase-randomiza-tion .When the phase was randomized ,low-pass filtering and smoothing effects were observed ,espe-cially when the spectrum of the object went rich ,the image became hard to be recognized .However , increasing the coded cell size could improve the coding accuracy and yield clear images .