Coded Aperture Imaging

Ordinary lenses cannot reflect, refract or focus X-rays, so coded aperture imaging arises at the historic moment. Modulation masks can change the distribution of beam in imaging systems. This chapter introduces the theoretical basis of coded aperture imaging technology and the basic structure of the computational imaging models. Then the method of optimal coded template and the estimation method of point spread function (PSF) are introduced. The spatial and spectral dimensional coded structures of coded aperture spectral imaging techniques are analyzed and compared. A multi-image encryption method based on compressed coded aperture imaging and pixel position scrambling operation is introduced. It focuses on the principles of self-interference coded aperture correlation holography and non-interference coded aperture correlation holography including diffraction model, reconstruction algorithm, noise source, development and application, etc.