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Parameter Estimations of ML Test Based Decoders for Perceptually Watermarked Images
이진걸 한국멀티미디어학회 2005 멀티미디어학회논문지 Vol.8 No.12
Based on the generalized Gaussian pdf of DCT coefficients of images, Hernandez et al. propose the ML test applied watermark decoder. For images with watermarks shaped by the visibility thresholds of DCT coefficients and the luminance masking of human visual system, they conclude that the ML test with an appropriately chosen parameter associated with the pdf of DCT coefficients outperforms the correlation based decoder. In this paper, the parameter is estimated using various methods including a novel one for watermarks shaped by the visibility thresholds of DCT coefficients and the luminance masking as Hernandez et al. did and with the contrast masking added, and its effect on performance is compared.
이진걸,조헌포,이준기,박준호 대한이비인후과학회 부산,울산,경남 지부회 2014 임상이비인후과 Vol.25 No.1
Epithelial-Myoepithelial carcinoma (EMC) is rare salivary gland neoplasm with a propensity to arise from major salivary gland, particularly of the parotid. EMC shows a characteristic biphasic population of epithelium and myoepithelium but shows various cytologic and histologic features, so this low grade malignancy can cause diagnostic confusion during workup and also frequently be misdiagnosed as other high grade salivary malignancy. Therefore histopathologic diagnosis is essential and immunohistochemistry is an important tool when making differential diagnosis. The treatment of choice is wide surgical excision, and long-term follow up is necessary to evaluate local recurrences. We herein report a case of EMC arising in a sublingual gland with a review of the relevant literature.