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A novel optical system architecture employing local holographic recording with a pico-second pulsed fiber laser and a small page size SLM has the potential towards realizing compact, high capacity and high data transfer rate optical storage.
Glaucoma is a leading cause of blindness with permanent damage to optic nerve head. ARGALI is an automated computer-aided diagnosis system designed for glaucoma detection via optic cup-to-disc ratio assessment. It employs several methods to determine the optic cup and disc from retinal images. Optic disc detection and segmentation works have been widely reported with high success rate. However, the...
The optic disc is an important feature in the retina. We propose a method for the detection of the optic disc based on a supervised learning scheme. The method employs pixel and local neighbourhood features extracted from the ROI of a digital retinal fundus photograph. A support vector machine based classification mechanism is used to classify each image point as belonging to the cup and retina. The...
We propose a method for improving the accuracy of the optic cup detected from the ARGALI system. This method makes use of key points from the branching points of large vessels, the analysis of intensity variation and kinks from small vessels to obtain an enhanced optic cup. Measures used to assess the detection of the optic cup showed an 11% and 40% improvement in the mean average overlap and relative...
This paper proposes a method to detect the macula in the retinal fundus image automatically. The method makes use of the optic disc height obtained from the ARGALI to define the region of interest. Regions of dark spots are then detected by finding the coordinates with the lowest pixel intensity and determining the average pixel neighbourhood intensities. These regions are ranked to determine the...
This paper presents a photometric restoration technique that automatically corrects shading within retinal images taken with a fundus camera. The proposed technique is based on the observation that the background of retinal images usually shows flat reflectance variations due to its high similarity in color and texture. It estimates shading through an iterative polynomial interpolation procedure that...
Failure analysis on advanced logic and mixed signal ICs more and more has to deal with so called dasiasoft defectpsila. In this paper, a novel method to realize Soft Defect Localization (SDL) techniques without a synchronization signal for failure analysis is presented. We will present experimental results showing the accuracy of this method in order to help failure analysis to localize defect in...
Among biometric modalities existing nowadays for person identification, iris pattern recognition has reputed as one of the best performance systems. Unfortunately it has the lack of the user-friendliness that can be seen in hand geometry or face systems. To overcome these problems we propose a new kind of camera to capture iris image.
In order to lower data storage requirements for ID tokens or databases, compact formats are needed in any biometric modality. As there is no morphological parameters that could help in reducing data, as it happens with minutiae in fingerprints, iris needs a data reduction at the raw image level. This is becoming quite a controversial issue among this technology community. Two major approaches are...
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