Speckle reduction by selective spatial-domain mask in digital holography

• 来源期刊: 中国物理B（英文版）
• 关键词: digital holography speckle reduction spatial-domain mask
• 年，卷（期）: 2018,（10）
• 页码范围: 236-243
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/10/104202

摘要

An improved method of using a selective spatial-domain mask to reduce speckle noise in digital holography is pro-posed. The sub-holograms are obtained from the original hologram filtered by the binary masks including a shifting aperture for being reconstructed. Normally, the speckle patterns of these sub-reconstructed images are different. The speckle inten-sity of the final reconstructed image is suppressed by averaging the favorable sub-reconstructed images which are selected based on the most optimal pixel intensity sub-range in the sub-holograms. Compared with the conventional spatial-domain mask method, the proposed method not only reduces the speckle noise more effectively with fewer sub-reconstructed im-ages, but also reduces the redundant information used in the reconstruction process.