Image sharpening by DWT-based hysteresis

Authors:
Nuhman ul Haq;Khizar Hayat;Neelum Noreen;William Puech
Affiliations:
COMSATS Institute of IT, Abbottabad, Pakistan;COMSATS Institute of IT, Abbottabad, Pakistan;COMSATS Institute of IT, Abbottabad, Pakistan;LIRMM, Université Montpellier, France
Venue:
ACIVS'11 Proceedings of the 13th international conference on Advanced concepts for intelligent vision systems
Year:
2011

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Abstract

Improvement of edge details in an image is basically a process of extracting high frequency details from the image and then adding this information to the blurred image. In this paper we propose an image sharpening technique in which high frequency details are extracted using wavelet transforms and then added with the blurred image to enhance the edge details and visual quality. Before this addition, we perform some spatial domain processing on the high pass images, based on hysteresis, to suppress the pixels which may not belong to the edges but retained in the high-pass image.