The feedback theorem for sub-optimal filters

2016 ◽  
Author(s):  
Filippo Cacace ◽  
Alfredo Germani ◽  
Costanzo Manes
Keyword(s):  
Optimal Filters

scholarly journals Optimal filters for the moving lens effect

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Selim C. Hotinli ◽  
Matthew C. Johnson ◽  
Joel Meyers
Keyword(s):  
Lens Effect ◽  
Optimal Filters

scholarly journals Direct design of optimal filters from data

2008 ◽  
Vol 41 (2) ◽  
pp. 462-467 ◽  
Author(s):  
C. Novara ◽  
F. Ruiz ◽  
M. Milanese
Keyword(s):  
Optimal Filters ◽  
Direct Design

Designing a Color Filter with High Overall Transmittance for Improving the Color Accuracy of Digital Cameras

2021 ◽  
Vol 2021 (29) ◽  
pp. 1-6
Author(s):  
Yuteng Zhu ◽  
Graham D. Finlayson
Keyword(s):  
White Light ◽  
Digital Camera ◽  
Color Filter ◽  
Digital Cameras ◽  
Spectral Transmittance ◽  
Optimal Filters ◽  
Prior Art ◽  
Average Transmittance ◽  
Tristimulus Values ◽  
Correction Problem

Previously improved color accuracy of a given digital camera was achieved by carefully designing the spectral transmittance of a color filter to be placed in front of the camera. Specifically, the filter is designed in a way that the spectral sensitivities of the camera after filtering are approximately linearly related to the color matching functions (or tristimulus values) of the human visual system. To avoid filters that absorbed too much light, the optimization could incorporate a minimum per wavelength transmittance constraint. In this paper, we change the optimization so that the overall filter transmittance is bounded, i.e. we solve for the filter that (for a uniform white light) transmits (say) 50% of the light. Experiments demonstrate that these filters continue to solve the color correction problem (they make cameras much more colorimetric). Significantly, the optimal filters by restraining the average transmittance can deliver a further 10% improvement in terms of color accuracy compared to the prior art of bounding the low transmittance.

Optimal Filters in the Time Domain

2009 ◽  
pp. 1-18
Author(s):  
Jacob Benesty ◽  
Jingdong Chen ◽  
Yiteng Huang ◽  
Israel Cohen
Keyword(s):  
Time Domain ◽  
Optimal Filters ◽  
The Time Domain

Second-order-optimal filters on Lie groups

2013 ◽  
Author(s):  
Alessandro Saccon ◽  
Jochen Trumpf ◽  
Robert Mahony ◽  
A. Pedro Aguiar
Keyword(s):  
Lie Groups ◽  
Second Order ◽  
Optimal Filters
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