This paper presents a proposed cryptosystem to encrypt color images using cellular automata. A reversible cellular automaton has the characteristic of being able to return in the evolution of the automata, and is therefore, that in this paper are used to generate a symmetric key used to encrypt images.
Diabetic retinopathy is a complication of diabetes caused by changes in the blood vessels of the retina, can cause blindness if not detected and treated early. Exudates and hemorrhages are two major signs present in diabetic retinopathy. This paper presents an automated method for classifying patients suffering from diabetic retinopathy by analyzing the image of the retinal vascular network. The proposed method is divided into three stages: segmentation of hemorrhages and exudates by digital image processing of retinal vascular network using spatial domain methods, extraction of characteristics using Hu moments, and pattern recognition by using associative memories based on cellular automata.
This paper presents a methodology to implement a computational system that can identify people by the geometry of the veins of the dorsal hand from infrared images. The methodology is as follows: First, a prototype is built by a web camera whit infrared LEDs that allow capture infrared images of dorsal hand. Once the images are captured, the image analysis algorithms are applied by digital image processing in order to segment regions of interest. Once segmented images are obtained characteristics and the pattern representing each input image is formed. Since the input pattern for each image is obtained respectively, associative memory model based on cellular automata model responsible for pattern classification is constructed.
This paper presents an automated method for the detection of exudates and hemorrhages in retina images. The images used here were obtained by the clinical study called "fluorescein angiography" applied to patients who are suffering diabetic retinopathy. Diabetic retinopathy is a condition caused by diabetes prolonged exposition; the condition impairs the vision and could lead to lose it all. Exudates and hemorrhages are two of the damages presented in diabetic retinopathy. The exudates are rounded or oval yellowish-white coatings with indistinct borders and are located superficially in the retina's nerve fiber layer. On the other hand, hemorrhages occur when an abnormal bleeding is located inside the retina's blood vessels.
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