Results 271 to 280 of about 33,911 (307)

Statistical contrast enhancement of subtraction images for radiographic caries diagnosis

Oral Surgery, Oral Medicine, Oral Pathology, 1982
The effects of the nonlinear contrast-enhancement technique are examined in terms of diagnostic performance obtainable from subtracted dental radiographs for a variety of simulated exposures. Conventional bitewing radiographs of patients known to be free of caries were digitized by means of a computer interfaced with a conventional television camera ...
H G, Gröndahl, K, Gröndahl, T, Okano, R L, Webber   +3 more
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Enhancement of computed tomographic scanner based digital radiographic images

The British Journal of Radiology, 1983
Scanned digital radiographs are one of the imaging facilities available on the EMI 7070 scanner. The images offered by the system were found to be clinically poor and the reason for this was that the round shape of the patient was forming the major component of the image.
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Generalized fuzzy enhancement of image for radiographic testing weld

ISPA 2005. Proceedings of the 4th International Symposium on Image and Signal Processing and Analysis, 2005., 2005
Since radiographic testing weld image possesses several shortcomings, such as bad contrast ratio, narrow range of grayscale and fuzzy image, common enhancement method cannot improve contrast ratio and at the same time preserve edges well. Fuzzy enhancement does not modify pixel graylevel in the fuzzy feature space just like histogram and can obtain ...
null Zhang Xiao-guang, null Gao Ding, null Xu Jian-jian   +2 more
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Enhancement of Radiograph Images Based on Chaos Optimization

2009 International Workshop on Intelligent Systems and Applications, 2009
How to select the parameters of high-frequency emphasis filtering (HFEF) in order to enhance radiograph images, this paper presents an enhancing method based on chaos optimization algorithms (COA). Based on the properties of ergodicity, stochastic property and regularity of chaos, the chaos optimization method can get global solution with low ...
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Enhancing Radiographic Images Using Two Dimensional Left Median Filter

2011 Third National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics, 2011
The radiographic image has low contrast and high noise. In order to improve the image for observation and accurate analysis, various digital image processing techniques can be applied. In this research we propose Two Dimensional Left Median Filter method for de-noising radiographic images of welding. We have used the measures Peak Signal-to-Noise Ratio
Alireza Azari Moghaddam, Lalitha Rangarajan   +1 more
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Comparison of computer-generated, enhanced and conventional 2-dimensional radiographic imaging

American Journal of Orthodontics and Dentofacial Orthopedics, 2009
Technological advances have attempted to improve the standard of traditional x-ray imaging. ImageIQ software (LumenIQ, Bellingham, Wash) enhances conventional radiography by producing a computer-generated, enhanced 2-dimensional (2D) image, adding depth and detail.
Michael A, Hazey, Peter, Ngan, Harold, Reed, Thomas, Razmus, Richard, Crout, Elizabeth, Kao   +5 more
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Digital Image Enhancement Techniques for Dental Radiographs

2019
Dental radiographs suffer frequently from issues such as low contrast and non-uniform illumination. The first step, indeed a significant step, is to enhance these digital images to prepare them for successful post-processing. This pre-processing stage assists to increase the contrast between the foreground that is the teeth and bone from the background
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Enhancing Radiographic Dental Image Visualisation with Colourisation and Graphical User

Journal of Image Processing & Pattern Recognition Progress, 2020
Radiography has been used in dentistry to find cavities, bone loss, hidden dental structures, tumour, and cysts. Due to the monochromatic characteristic of X-ray images, it is difficult to discern disorders and explain the diagnosis procedure. Enhance the visualization of X-rays is one of the ways to ease the work of the dentist.
Karan Patel, Bhavesh Parmar
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Alpha-gamma equalization-enhanced hand radiographic image segmentation scheme

Optical Engineering, 2009
Bone age assessment of children is a procedure frequently performed in pediatric radiology. The feature extractions of metaphyseal and epiphyseal regions are crucial to automatic bone age assessment. The first step of feature extraction is applying a segmentation scheme to find exact regions of epiphysis and metaphysis.
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Enhancing recognition of lesions in radiographic images using perceptual feedback

Optical Engineering, 1998
When radiologists search a medical x-ray image for an abnor- mality, their eyes often fixate and refixate the true target, dwelling on it for prolonged times, often without recognizing that they have discovered the object of search. Monitoring the eye position of the radiologist pro- vides the x and y coordinates of the dwelling location. This location
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