BACKGROUND Cystic fibrosis (CF) patients would benefit from a safe and effective tool to detect early-stage, regional lung disease to allow for early intervention. Magnetic Resonance Imaging (MRI) is a safe, non-invasive procedure capable of providing quantitative assessments of disease without ionizing radiation. We developed a rapid normalized T1 MRI technique to detect regional lung disease ...

In the process of three-dimensional reconstruction of single particle biological macromolecules several hundreds, or thousands, of projection images are taken from tens or hundreds of independently digitized micrographs. These different micrographs show differences in the background grey level and particle contrast and, therefore, have to be normalized by scaling their pixel values before enter...

Training: intractable likelihood likelihood needed for MCMC; grid MRF intractable due to global normalization. Solution: pseudo-likelihood approximation, locally normalized: p(y|f) = ∏P p=1 p(yp|yp+1 . . . yP , f) ≈ ∏P p=1 p(yp|neighbours(p), f) Prediction: intractable marginals Pixel-wise MAP intractable in grid MRF. Solution: Obtain approximate marginals using treereweighted belief propagatio...

The main difficulty to attain fully autonomous robot navigation outdoors is the fast detection of reliable visual references, and their subsequent characterization as landmarks for immediate and unambiguous recognition. Aimed at speed, our strategy has been to track salient regions along image streams by just performing on-line pixel sampling. Persistent regions are considered good candidates f...

In this paper, a novel strategy based on the notion of threshold is proposed to accomplish segmentation of objects and background in a scene. Optimal threshold for two class and three classes problems are determined from the histogram of featured pixel values as opposed to the original normalized histogram. Genetic algorithm (GA) and Parallel Genetic Algorithm (PGA) based clustering algorithms ...

Zoning is widely used for obtaining topological features of handwritten characters. In this paper we have modified the zoning criteria using fuzzy boundary of individual zones keeping the point in mind that writing style of different persons may shift the structural pattern of the character from one zone to the adjacent zone. The zone-wise normalized distance of individual black pixel along wit...

One of the difficulties in obtaining a dense and accurate disparity map through stereo matching is the presence of radiometric variation in the two images used in this process.It is commonly assumed that in stereo matching, the corresponding pixels have similar pixel values. But the presence of this variation causes the regular methods to produce erroneous results. In this paper, we use the con...

A new method for feature extraction based on FPGA (Field Programmable Gate Arrays) implementation is proposed in this paper. The specific application is offline Farsi handwritten digit recognition. The classification is based on a simple two layer MLP (Multi Layer Perceptron). This method of feature extraction is appropriate for FPGA implementation as it can be implemented only with addition an...

We present a CUDA implementation of a complete registration algorithm, which is capable of aligning two multimodal images, using affine linear transformations and normalized gradient fields. Through the extensive use of different memory types, well handled thread management and efficient hardware interpolation we gained fast executing code. Contrary to the common technique of reducing kernel ca...

A recursive filter for effective suppression of impulse noise is presented in this paper. The proposed work estimates the noise corruption level and the position of impulses in the first stage. The appropriate filter parameters for a detail-preserving restoration of the corrupted pixels are determined based on these estimations. The filtering process assumes a Gaussian spatial profile in the ne...