期刊名称：Majalah Iptek = IPTEK : The Journal for Technology and Science
印刷版ISSN：0853-4098
电子版ISSN：2088-2033
出版年度：2019
卷号：29
期号：2
页码：44-48
DOI：10.12962/j20882033.v29i2.3356
出版社：IPTEK
摘要：Many imaging systems produce images with deficient sharpness due to different real limitations. Hence, various
image sharpening techniques have been used to improve the acutance of digital images. One of such is the well-known
Laplacian sharpening technique. When implementing the basic Laplacian technique for image sharpening, two main
drawbacks were detected. First, the amount of introduced sharpness cannot be increased or decreased. Second, in many
situations, the resulted image suffers from a noticeable increase in brightness around the sharpened edges. In this article, an
improved version of the basic Laplacian technique is proposed, wherein it contains two key modifications of weighting the
Laplace operator to control the introduced sharpness and tweaking the second order derivatives to provide adequate
brightness for recovered edges. To perform reliable experiments, only real-degraded images were used, and their accuracies
were measured using a specialized no-reference image quality assessment metric. From the obtained experimental results, it
is evident that the proposed technique outperformed the comparable techniques in terms of recorded accuracy and visual
appearance.
