라플라시안 피라미드에서의 다중스케일 비선형 이득 조절을 이용한 DR 영상 개선
DR Image Enhancement Using Multiscale Non-Linear Gain Control For Laplacian Pyramid Transformation
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Abstract
In digital radiography, to improve the contrast of digital radiography image, the multi-scale nonlinear amplification algorithm based on unsharp masking is one of the major image enhancement algorithms. In this paper, we used the Laplacian pyramid to decompose a digital radiography(DR) image. In our simulation, the DR image was decomposed into seven layers and the coefficients of the each layer was amplified with nonlinear function. We also imported a noise containment algorithm to limit noise amplification. To enhance the contrast of image, we proposed a new adaptive non-linear gain amplification coefficients. As a result of having applied to some clinical data, a detail visibility was improved significantly without unacceptable noise boosting.Images that acquired with the proposed adaptive non-linear gain coefficients have shown superior quality to those that applied similar gain control method and expected to be accepted in the clinical applications.
참고문헌 (14)
- M Prokop, "Improved parameters for unsharp mask filtering of digital chest radiographs", 187, pp.521~526 (1993)
- HP McAdams, "Implementation of adaptive filtration for digital chest imaging", 26, pp.669~674 (1987)
- Y Sasaki, "A fully automated adaptive unsharp masking technique in digital chest Radiograph", 27, pp.64~70 (1992)
- HP Mcadams, "Histogram- directed processing of digital chest images", 21, pp.253~259 (1986)
- LD Loo, "Investigation of basic imaging pro- perties in digital radiography. 4 Effect of unshart masking on the detectability of simple patterns", 12(2), pp.209~214 (1985)
- TL Ji, "Adaptive image contrast enhancement based on human visual properties", 13(4), pp.573~586 (1994)
- AN Akansu, "Multiresolution Signal Decomposition" (1992)
- PJ BURT, "The laplacian pyramid as a compact image code", pp.532~31 540 (1983)
- EH Adelson, "Pyramid methods in image processing", 29, pp.33~41 (1984)
- AF Laine, "Discrete dyadic wavelet transform for contrast enhancement", 2303, pp.456~460 (1994)
- M Stahl, "Noise-resistant weak-structure enhancement for digital radiography", 3661, pp.1406~1417 (1999)
- M Stahl, "Digital radiography enhancement by nonlinear multiscale processing", 27(1), pp.56~65 (2000)
- C Fivez, "Multi-resolution contrast amplification in digital radiography with compensation for scattered radiation", 1, pp.339~342 (1996)
- T Aach, "Spectral transform-based nonlinear restoration of medical images: Algorithms and a comparative evaluation", 3646, pp.270~280 (1999)