modified nonnegative matrix factorization for endmember spectra
... endmember. In this case, there is at least one observed spectral vector on each vertex of the data simplex. This pure pixel assumption is not valid in many hyperspectral datasets. Therefore, other geometry-based techniques have been designed in order to cope with the pure pixel assumption issue [12] ...
... endmember. In this case, there is at least one observed spectral vector on each vertex of the data simplex. This pure pixel assumption is not valid in many hyperspectral datasets. Therefore, other geometry-based techniques have been designed in order to cope with the pure pixel assumption issue [12] ...
spie01.mel - Computing Science
... In the final approach, small glyphs were used to illustrate the direction (increase or decrease) and strength of MS lesion changes. First, changes in lesion data between two time steps were found by subtraction. An isosurface was extracted from this change data using the marching cubes algorithm, an ...
... In the final approach, small glyphs were used to illustrate the direction (increase or decrease) and strength of MS lesion changes. First, changes in lesion data between two time steps were found by subtraction. An isosurface was extracted from this change data using the marching cubes algorithm, an ...
2D Graphics
... • Computer Graphics: the creation, storage, and manipulation of images and their models • Model: a mathematical representation of an image containing the important properties of an object (location, size, orientation, color, texture, etc.) in data structures • Rendering: Using the properties of t ...
... • Computer Graphics: the creation, storage, and manipulation of images and their models • Model: a mathematical representation of an image containing the important properties of an object (location, size, orientation, color, texture, etc.) in data structures • Rendering: Using the properties of t ...
2D Graphics
... • Computer Graphics: the creation, storage, and manipulation of images and their models • Model: a mathematical representation of an image containing the important properties of an object (location, size, orientation, color, texture, etc.) in data structures • Rendering: Using the properties of the ...
... • Computer Graphics: the creation, storage, and manipulation of images and their models • Model: a mathematical representation of an image containing the important properties of an object (location, size, orientation, color, texture, etc.) in data structures • Rendering: Using the properties of the ...
1( , 1 D zxg - Wolfgang Stuerzlinger
... Next we render the ellipsoids using a second texture that determines their color. We use another Perlin noise texture modulated with the color of the ellipsoids calculated using an infinite light source representing the Sun. The latter produces a simple approximation to global illumination of the cl ...
... Next we render the ellipsoids using a second texture that determines their color. We use another Perlin noise texture modulated with the color of the ellipsoids calculated using an infinite light source representing the Sun. The latter produces a simple approximation to global illumination of the cl ...
Fundamentals of Multimedia, Chapter 18
... • To deal with illumination change from the query image to different database images, each color channel band of each image is first normalized, and then compressed to a 36-vector. • A 2-dimensional color histogram is then created by using the chromaticity, which is the set of band ratios {R,G}/(R+G ...
... • To deal with illumination change from the query image to different database images, each color channel band of each image is first normalized, and then compressed to a 36-vector. • A 2-dimensional color histogram is then created by using the chromaticity, which is the set of band ratios {R,G}/(R+G ...
A Method for Modeling Noise in Medical Images
... Several methods for estimating the variance of white additive noise in images have been proposed [1] but they cannot be used on images where the relationship (1) applies since the noise variance on them is nonuniform. The method presented here is more general and measures the noise variance in smoot ...
... Several methods for estimating the variance of white additive noise in images have been proposed [1] but they cannot be used on images where the relationship (1) applies since the noise variance on them is nonuniform. The method presented here is more general and measures the noise variance in smoot ...
Insitute of Computer Graphics and Algorithms, Vienna University of
... Spectroscopy is most important analysis tool in all natural sciences Astrophysics, chemical/material sciences, biomedicine, geophysics,… ...
... Spectroscopy is most important analysis tool in all natural sciences Astrophysics, chemical/material sciences, biomedicine, geophysics,… ...
Institutionen för systemteknik Department of Electrical Engineering Examensarbete
... one can measure the similarity between such. It also describes methods which can be used to speed up image database look-ups. To be able to completely understand the image retrieval algorithm suggested later on in this paper, it is essential to have some knowledge about the different components out ...
... one can measure the similarity between such. It also describes methods which can be used to speed up image database look-ups. To be able to completely understand the image retrieval algorithm suggested later on in this paper, it is essential to have some knowledge about the different components out ...
Segmentation and Alignment of 3-D Transaxial Myocardial Perfusion Images and
... imaging modality which is readily used in many applications for measuring physiological properties of the human body. One very common type of examination using SPECT is when measuring myocardial perfusion (blood flow in the heart tissue), which is often used to examine e.g. a possible myocardial inf ...
... imaging modality which is readily used in many applications for measuring physiological properties of the human body. One very common type of examination using SPECT is when measuring myocardial perfusion (blood flow in the heart tissue), which is often used to examine e.g. a possible myocardial inf ...
2D Graphics
... level, the rendering process is the same whether the target rendering device is a screen or a printer. When a component needs to be displayed, its paint or update method is automatically invoked with the appropriate Graphics context. The Java 2D API includes the java.awt.Graphics2D class, which exte ...
... level, the rendering process is the same whether the target rendering device is a screen or a printer. When a component needs to be displayed, its paint or update method is automatically invoked with the appropriate Graphics context. The Java 2D API includes the java.awt.Graphics2D class, which exte ...
Real-Time Procedural Textures
... space. Ideally, we would use the derivatives of u and v with respect to screen spacex and y. However because of limited pixel memory, we decided to record this estimate using a single number, called the tam-e scalefactor. This number is intended to represent the maximum magnification factor that can ...
... space. Ideally, we would use the derivatives of u and v with respect to screen spacex and y. However because of limited pixel memory, we decided to record this estimate using a single number, called the tam-e scalefactor. This number is intended to represent the maximum magnification factor that can ...
Pill-ID: Matching and Retrieval of Drug Pill Images
... Worldwide, law enforcement agencies are encountering a substantial increase in the number of illicit drug pills being circulated in our society. Identifying the source and manufacturer of these illicit drugs will help deter drug-related crimes. We have developed an automatic system, called Pill-ID t ...
... Worldwide, law enforcement agencies are encountering a substantial increase in the number of illicit drug pills being circulated in our society. Identifying the source and manufacturer of these illicit drugs will help deter drug-related crimes. We have developed an automatic system, called Pill-ID t ...
Spatial anti-aliasing
In digital signal processing, spatial anti-aliasing is the technique of minimizing the distortion artifacts known as aliasing when representing a high-resolution image at a lower resolution. Anti-aliasing is used in digital photography, computer graphics, digital audio, and many other applications.Anti-aliasing means removing signal components that have a higher frequency than is able to be properly resolved by the recording (or sampling) device. This removal is done before (re)sampling at a lower resolution. When sampling is performed without removing this part of the signal, it causes undesirable artifacts such as the black-and-white noise near the top of figure 1-a below.In signal acquisition and audio, anti-aliasing is often done using an analog anti-aliasing filter to remove the out-of-band component of the input signal prior to sampling with an analog-to-digital converter. In digital photography, optical anti-aliasing filters are made of birefringent materials, and smooth the signal in the spatial optical domain. The anti-aliasing filter essentially blurs the image slightly in order to reduce the resolution to or below that achievable by the digital sensor (the larger the pixel pitch, the lower the achievable resolution at the sensor level).