2026-04-17T20:01:37Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/109202024-05-22T09:48:36Zcom_2072_452955com_2072_2054col_2072_452957

00925njm 22002777a 4500 dc Tortajada Giménez, Meritxell author Oliver i Malagelada, Arnau author Martí Marly, Robert author Ganau, Sergi author Tortajada, Lídia author Sentís, Melcior author Freixenet i Bosch, Jordi author Zwiggelaar, Reyer author info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2014-07-01 Digital mammograms may present an overexposed area in the peripheral part of the breast, which is visually shown as a darker area with lower contrast. This has a direct impact on image quality and affects image visualisation and assessment. This paper presents an automatic method to enhance the overexposed peripheral breast area providing a more homogeneous and improved view of the whole mammogram. The method automatically restores the overexposed area by equalising the image using information from the intensity of non-overexposed neighbour pixels. The correction is based on a multiplicative model and on the computation of the distance map from the breast boundary. A total of 334 digital mammograms were used for evaluation. Mammograms before and after enhancement were evaluated by an expert using visual comparison. In 90.42% of the cases, the enhancement obtained improved visualisation compared to the original image in terms of contrast and detail. Moreover, results show that lesions found in the peripheral area after enhancement presented a more homogeneous intensity distribution. Hence, peripheral enhancement is shown to improve visualisation and will play a role in further development of CAD systems in mammography This work was partially funded by the Spanish R+D+I Grant no. TIN2012-37171-C02-01. M. Tortajada holds a UdG BR-GR10 grant http://hdl.handle.net/10256/10920 Imatges -- Processament Image processing Mama -- Radiografia Breast -- Radiography Imatges digitals Digital images Imatgeria mèdica Imaging systems in medicine Breast peripheral area correction in digital mammograms