In this work, the authors have developed a computer-aided diagnosis system, based on two-level artificial neural network (ANN) architecture. This was trained, tested, and evaluated specifically problem of detecting lung cancer nodules found digitized chest radiographs. The first ANN performs detection suspicious regions in low-resolution image. input to second are curvature peaks computed for all pixels each region. comes from fact that small tumors possess identifiable signature...

Dry eye is a symptomatic disease which affects wide range of population and has negative impact on their daily activities. Its diagnosis can be achieved by analyzing the interference patterns tear film lipid layer classifying them into one Guillon categories. The manual process done experts not only affected subjective factors but also very time consuming. In this paper we propose general methodology to automatic classification layer, using color texture information characterize image...

To validate a computer-based method for measuring the calibre of retinal blood vessels, and use it to determine effects ageing arterial hypertension on calibres these vessels their ratio.Digital eye fundus images covering 50 degrees field centred optic disc were obtained using 540 nm filter. The boundaries crossing series circles concentric with located by an image analysis program; perpendicularly determined automatically, average arteriole vein calculated, arteriovenous ratio (AVR) was...

This work describes a computational scheme for automatic detection of suspected lung nodules in chest radiograph. A knowledge‐based system extracts the masks over which we will apply nodule process. First obtain normalized cross‐correlation image. Next detect suspicious regions by assuming threshold. We examine using variable threshold results growth areas and an increase false positives. reduce large number positives applying facet model to An algorithmic classification process gives...

The tear film lipid layer is heterogeneous among the population. Its classification depends on its thickness and can be done using interference pattern categories proposed by Guillon. phenomena characterised as a colour texture pattern, which automatically classified into one of these categories. From photography eye, region interest detected low-level features are extracted, generating feature vector that describes it, to finally in target This paper presents an exhaustive study about...

Dry eye syndrome is recognized as a growing health problem, and one of the most frequent reasons for seeking care. Its etiology management challenge clinicians researchers alike, several clinical tests can be used to diagnose it. One frequently evaluation interference patterns tear film lipid layer. Based on this test, paper presents CASDES, computer-aided system support diagnosis dry syndrome. Furthermore, CASDES also useful other diseases, such meibomian gland dysfunction, since it...

Conjunctival hyperemia or conjunctival redness is a symptom that can be associated with broad group of ocular diseases. Its levels severity are represented by standard photographic charts visually compared the patient’s eye. This way, diagnosis becomes nonrepeatable task depends on experience grader. To solve this problem, we have proposed computer-aided methodology comprises three main stages: segmentation conjunctiva, extraction features in region based colour and presence blood vessels,...

This paper presents a comparative study of different texture extraction methods for the automatic classification tear film lipid layer based on categories enumerated by Guillon. From photography eye, region interest is detected and its low-level features are extracted, generating feature vector that describes it, to be finally classified in one target categories. discusses several analysis colour spaces generate vectors. The proposed have been tested dataset composed 105 images, with rate...

The Break-Up Time test (BUT) evaluates the quality and stability of tear film. It is used for diagnosis dry eye syndrome, a widespread disease in developed world. This paper describes an automatic methodology to evaluate BUT test. locates different measurement areas from video film, extracts region interest performs each area. We have tested our on dataset composed 18 videos annotated by 4 experts. difference between value provided experts same range as themselves.

Hyperemia is the occurrence of redness in a certain tissue. When it takes place on bulbar conjunctiva, can be an early symptom different pathologies, hence, importance its quick evaluation. Experts grade hyperemia as value continuous scale, according to severity level. As subjective and time consuming task, automatisation priority for optometrists. To this end, several image features are computed from video frame that shows patient’s eye. Then, these transformed grading scale by means...

In this work a new methodology for automatic three dimensional shape reconstruction of bones from tomographic cross-sections is presented, based in the topological active net model. The presented fundamentaly composed by two steps. first one, with purpose differentiate internal and external contours bony structures, existent image sequence are extracted. For purpose, analysis mesh done. second step 3D bones' obtained tracking rest slices using information previous stages process introducing...

Dry eye syndrome is characterized by symptoms of discomfort, ocular surface damage, reduced tear film stability, and hyperosmolarity. These features can be identified several types diagnostic tests, although there may not a direct correlation between the severity degree damage. One most used clinical tests analysis lipid interference patterns, which observed on film, their classification into Guillon categories. Our previous researches have demonstrated that patterns as color texture...

Dry eye is a common disease which affects large portion of the population and harms their routine activities. Its diagnosis monitoring require battery tests, each designed for different aspects. One these clinical tests measures quality tear film based on its appearance, can be observed using Doane interferometer. The manual process done by experts consists classifying interferometry images into one five categories considered. variability existing in makes necessary use an automatic system...

Dry eye is a symptomatic disease which affects wide range of population and has negative impact on their daily activities, such as driving or working with computers. Its diagnosis can be achieved by several clinical tests, one the analysis interference pattern its classification into Guillon's categories. The methodologies for automatic obtain promising results but at expense requiring long processing time. In this research, feature selection techniques are used to reduce time whilst...