TAILIEUCHUNG - OPTICAL IMAGING AND SPECTROSCOPY Phần 7

Tham khảo tài liệu 'optical imaging and spectroscopy phần 7', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CODING TAXONOMY 303 mask pixel. If each value of H can be independently selected the number of code values greatly exceeds the number of signal pixels reconstructed. Pixel coding is commonly used in spectroscopy and spectral imaging. Structured spatial and temporal modulation of object illumination is also an example of pixel coding. In imaging systems focal plane foveation and some forms of embedded readout circuit processing may also be considered as pixel coding. The impulse response of a pixel coded system is shift-variant. Physical constraints typically limit the maximum value or total energy of the elements of H. Convolutional coding refers to systems with shift-invariant impulse reponse h x x . As we have seen in imaging system analysis convolutional coding is exceedingly common in optical systems with conventional focal imaging as the canonical example. Further examples arise in dispersive spectroscopy. We further divide convolutional coding into projective coding under which code parameters directly modulate the spatial structure of the impulse response and Fourier coding under which code parameters modulate the spatial structure of the transfer function. Coded aperture imaging and computed tomography are examples of projective coding systems. Section describes the use of pupil plane modulation to implement Fourier coding for extended depth of field. The number of code elements in a convolutional code corresponds to the number of resolution elements in the impulse response. Since the support of the impulse response is usually much less than the support of the image the number of code elements per image pixel is much less than one. Implicit coding refers to systems where code parameters do not directly modulate H. Rather the physical structure of optical elements and the sampling geometry are selected to create an invertible measurement code. Reference structure tomography van Cittert-Zernike-based imaging and Fourier transform spectroscopy are .

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