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2 results on '"mean absolute error"'

1. Changes in Anterior Chamber Depth after Phacoemulsification in Pseudoexfoliative Eyes and their Effect on Accuracy of Intraocular Lens Power Calculation

Author

Sirel Gür Güngör, Ahmet Akman, Leyla Asena, Mustafa Aksoy, and Almila Sarıgül Sezenöz

Subjects
Anterior chamber depth, mean absolute error, phacoemulsification surgery, pseudoexfoliation syndrome, Medicine, Ophthalmology, RE1-994
Abstract

Objectives: To compare anterior chamber depth (ACD) changes after phacoemulsification surgery in patients with pseudoexfoliation syndrome (PEX) and normal patients using an anterior segment imaging method. Another aim of this study was to evaluate the effect of these changes on the accuracy of intraocular lens (IOL) power calculation and postoperative refraction. Materials and Methods: Twenty-two eyes of 22 patients with PEX and 30 eyes of 30 normal patients who underwent uneventful phacoemulsification surgery and IOL implantation were included in the study. The ACD of all patients was evaluated preoperatively and at 3 months postoperatively with the ALLEGRO Oculyzer (WaveLight® Oculyzer™ II, Alcon, Novartis)-Scheimpflug imaging system. Results: The postoperative mean ACD values were significantly larger than the preoperative ACD values in both groups (p

Published
2016
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2. Doğrultulu maksimum yöntemiyle ultrasonik ark haritalarının işlenmesi ve varolan yöntemlerle karşılaştırması

Author

Kerern Altun and Billur Barshan

Subjects
Error detection, Signal processing, Computer science, Overall performance, Performance criterion, Conformal mapping, Intelligent sensor, Eliminating noise, Processing techniques, Computer vision, Ultrasonic ranging, Ultrasonics, Motion planning, Mean absolute error, Cavity resonators, Ultrasonic testing, Through-wall, Map-building, business.industry, Electrical engineering, Optical projectors, Ultrasonic arc maps, Mobile robot, Cross talks, Ultrasonic applications, Processing time, Delta modulation, Range accuracy, Maps, Angular uncertainty, Detection rates, Ultrasonic sensor, Artificial intelligence, business
Abstract

Date of Conference: 11-13 June 2007 Conference Name: 15th Signal Processing and Communications Applications, IEEE 2007 Directional maximum (DM) technique for processing ultrasonic arc maps (UAMs) is proposed and compared to existing techniques. It employs directional processing in extracting the map of the environment from UAMs. DM aims at overcoming the intrinsic angular uncertainty of ultrasonic sensors in map building, as well as eliminating noise and cross-talk related misreadings. The comparison is based on experiments with a mobile robot which ac-quired ultrasonic range measurements through wall following. Three complementary performance criteria are used. The DM technique offers a very good compromise between mean absolute error and correct detection rate, with a processing time less than one tenth of a second. It is also superior in range accuracy and in eliminating artifacts, resulting in the best overall performance. The results indicate several trade-offs in the choice of UAM processing techniques.

Published
2007

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