In this paper, we will present a novel but simple unified method to locally detect blocking artifact and blur in digital compressed image. Digital images are prone to coding artifacts in terms of blur and blocking artifacts. Each of the distortion mentioned above has different characteristics due to coding scheme applied to the images. We present a local blur and blocking artifact detection bas...

Figure 1. Demonstrations of the edge artifact observed in LGE (yellow arrow). .A-B are Bloch simulations of the Cartesian (A) and spiral LGE sequences for circles with T1 values of 300ms and 200ms (top circle and bottom circle respectively). C-D show phantom images acquired with the Cartesian LGE sequence, where the edge artifact can be observed with greater intensity for increasing acquisition...

All image compression techniques exhibit artifacts at very low bit rates. The main artifact that occurs in wavelet based compression is ringing around high contrast edges. The problem of artifact mitigation is addressed in this work. A low-resolution edge map is computed from a low frequency subband in the wavelet decomposition. Edge strength is used to selectively emphasize or deemphasize spat...

image processing applications. In case of image compression, quality of decompressed image is also the criterion for evaluation of given coding scheme. In the process of compression –decompression various artifacts such as blocking artifacts, blur artifact, ringing or edge artifact are observed. However quantification of these artifacts is a difficult task. We propose here novel method to quant...

Metal in CT-imaged objects drastically reduces the quality of these images due to the severe artifacts it can cause. Most metal artifacts reduction (MAR) algorithms consider the metal-affected sinogram portions as the corrupted data and replace them via sophisticated interpolation methods. While these schemes are successful in removing the metal artifacts, they fail to recover some of the edge ...

A "featherlike" artifact, termed a cusp artifact, is sometimes seen along the phase-encoding direction in sagittal or coronal fast spin echo images. This artifact arises from the spins, at a location distant from the magnet isocenter, that are excited and aliased to the field of view because their precession frequency is similar to those at the isocenter. Such a situation is created due to a co...

Objective(s): We evaluated edge artifacts in relation to phantom diameter and reconstruction parameters in point spread function (PSF)-based positron emission tomography (PET) image reconstruction.Methods: PET data were acquired from an original cone-shaped phantom filled with 18F solution (21.9 kBq/mL) for 10 min using a Biograph mCT scanner. The images were reconstructed using the baseline or...

The error diffusion method generates worm artifacts, and weakens the edge of the halftone image when the continuous gray scale image is reproduced by a binary image. First, to enhance the edges, we propose the edge-enhancing filter by considering the quantization error information and gradient of the neighboring pixels. Furthermore, to remove worm artifacts often appearing in a halftone image, ...

Retrieving salient structure from textured images is an important but difficult problem in computer vision because texture, which can be irregular, anisotropic, non-uniform and complex, shares many of the same properties as structure. Observing that salient structure in a textured image should be piece-wise smooth, we present a method to retrieve such structures using an L0 minimization of a mo...