The assessment of phase only filters in imaging systems by the classical optical merit functions
Spatial light modulators (SLM) have found a wide range of applications in many fields of optical imaging and measurement systems. We implement different phase only filters in the pupil plane of an imaging system. The phase only filter is divided in five equally spaced annuli. Each annulus has a diff...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0277786X_v7000_n_p_Hild |
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todo:paper_0277786X_v7000_n_p_Hild2023-10-03T15:16:38Z The assessment of phase only filters in imaging systems by the classical optical merit functions Hild, R. Campos, J. Yzuel, M. Iemmr, C. Gimeno, R. Escalera, J.C. Diffractive optics Optical imaging theory Optical merit functions Optical system design Photon management Spatial light modulators Computer graphics Digital arithmetic Digital image storage Functions Image processing Image quality Imaging systems Imaging techniques Lead Light modulation Light modulators Liquid membranes Modulation Optical data processing Optical filters Optical systems Optical transfer function Optoelectronic devices Transfer functions Wave filters Alternating phase Digital image processing Image intensities Image planes Line-spread function (LSF) Measurement systems Merit functions Modulation Transfer Function (MTF) Optical (PET) (OPET) Optical imaging Phase transmission Phase-only filtering Point Spread Function (PSF) Pupil planes Side lobes Spatial light modulators (SLM) Wide-range Three dimensional Spatial light modulators (SLM) have found a wide range of applications in many fields of optical imaging and measurement systems. We implement different phase only filters in the pupil plane of an imaging system. The phase only filter is divided in five equally spaced annuli. Each annulus has a different phase transmission and inside each annulus the phase is constant. We analyse first the influence of linear decreasing or increasing phase, second we use one phase annulus with a phase shift of π in different positions over the pupil and finally an alternating phase between 0 and π over the pupil. Merit functions of the different filters are calculated. The radial and axial point spread function (PSF) or the 3D line spread function show that in some cases these phase only filters will shift the best image plane. The experimental results show the close correlation to the calculated shift of the best image plane. The strong side lobes that appear in the merit functions lead to the conclusion that the image quality will be influenced as well. This can be confirmed by the calculation and the measurement of the image intensity. So in order to get more information about the expected image it is necessary to study the 3D modulation transfer function (MTF). With the MTF one can see that the contrast decreases for the image obtained with each filter in comparison with the image obtained with the clear pupil. The conclusion of our work is, that it is necessary to study the influence of all merit functions in order to design an optimum filter for a given application. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0277786X_v7000_n_p_Hild |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Diffractive optics Optical imaging theory Optical merit functions Optical system design Photon management Spatial light modulators Computer graphics Digital arithmetic Digital image storage Functions Image processing Image quality Imaging systems Imaging techniques Lead Light modulation Light modulators Liquid membranes Modulation Optical data processing Optical filters Optical systems Optical transfer function Optoelectronic devices Transfer functions Wave filters Alternating phase Digital image processing Image intensities Image planes Line-spread function (LSF) Measurement systems Merit functions Modulation Transfer Function (MTF) Optical (PET) (OPET) Optical imaging Phase transmission Phase-only filtering Point Spread Function (PSF) Pupil planes Side lobes Spatial light modulators (SLM) Wide-range Three dimensional |
| spellingShingle |
Diffractive optics Optical imaging theory Optical merit functions Optical system design Photon management Spatial light modulators Computer graphics Digital arithmetic Digital image storage Functions Image processing Image quality Imaging systems Imaging techniques Lead Light modulation Light modulators Liquid membranes Modulation Optical data processing Optical filters Optical systems Optical transfer function Optoelectronic devices Transfer functions Wave filters Alternating phase Digital image processing Image intensities Image planes Line-spread function (LSF) Measurement systems Merit functions Modulation Transfer Function (MTF) Optical (PET) (OPET) Optical imaging Phase transmission Phase-only filtering Point Spread Function (PSF) Pupil planes Side lobes Spatial light modulators (SLM) Wide-range Three dimensional Hild, R. Campos, J. Yzuel, M. Iemmr, C. Gimeno, R. Escalera, J.C. The assessment of phase only filters in imaging systems by the classical optical merit functions |
| topic_facet |
Diffractive optics Optical imaging theory Optical merit functions Optical system design Photon management Spatial light modulators Computer graphics Digital arithmetic Digital image storage Functions Image processing Image quality Imaging systems Imaging techniques Lead Light modulation Light modulators Liquid membranes Modulation Optical data processing Optical filters Optical systems Optical transfer function Optoelectronic devices Transfer functions Wave filters Alternating phase Digital image processing Image intensities Image planes Line-spread function (LSF) Measurement systems Merit functions Modulation Transfer Function (MTF) Optical (PET) (OPET) Optical imaging Phase transmission Phase-only filtering Point Spread Function (PSF) Pupil planes Side lobes Spatial light modulators (SLM) Wide-range Three dimensional |
| description |
Spatial light modulators (SLM) have found a wide range of applications in many fields of optical imaging and measurement systems. We implement different phase only filters in the pupil plane of an imaging system. The phase only filter is divided in five equally spaced annuli. Each annulus has a different phase transmission and inside each annulus the phase is constant. We analyse first the influence of linear decreasing or increasing phase, second we use one phase annulus with a phase shift of π in different positions over the pupil and finally an alternating phase between 0 and π over the pupil. Merit functions of the different filters are calculated. The radial and axial point spread function (PSF) or the 3D line spread function show that in some cases these phase only filters will shift the best image plane. The experimental results show the close correlation to the calculated shift of the best image plane. The strong side lobes that appear in the merit functions lead to the conclusion that the image quality will be influenced as well. This can be confirmed by the calculation and the measurement of the image intensity. So in order to get more information about the expected image it is necessary to study the 3D modulation transfer function (MTF). With the MTF one can see that the contrast decreases for the image obtained with each filter in comparison with the image obtained with the clear pupil. The conclusion of our work is, that it is necessary to study the influence of all merit functions in order to design an optimum filter for a given application. |
| format |
CONF |
| author |
Hild, R. Campos, J. Yzuel, M. Iemmr, C. Gimeno, R. Escalera, J.C. |
| author_facet |
Hild, R. Campos, J. Yzuel, M. Iemmr, C. Gimeno, R. Escalera, J.C. |
| author_sort |
Hild, R. |
| title |
The assessment of phase only filters in imaging systems by the classical optical merit functions |
| title_short |
The assessment of phase only filters in imaging systems by the classical optical merit functions |
| title_full |
The assessment of phase only filters in imaging systems by the classical optical merit functions |
| title_fullStr |
The assessment of phase only filters in imaging systems by the classical optical merit functions |
| title_full_unstemmed |
The assessment of phase only filters in imaging systems by the classical optical merit functions |
| title_sort |
assessment of phase only filters in imaging systems by the classical optical merit functions |
| url |
http://hdl.handle.net/20.500.12110/paper_0277786X_v7000_n_p_Hild |
| work_keys_str_mv |
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