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題 名 | Comparison of Medical Image Quality between Light-box and Computer Monitor=顯示於觀片箱及電腦螢幕之醫學影像品質之比較 |
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作 者 | 林宗輝; 高材; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 21:2 2001.06[民90.06] |
頁 次 | 頁79-84 |
分類號 | 410.1644 |
關鍵詞 | 視覺模型; 影像品質; 螢幕; 觀片器; 亮度; Local contrast; Luminance; HVS model; Image quality; Computer monitor; Light-box; |
語 文 | 英文(English) |
中文摘要 | 以視覺系統為基礎的影像加強法則已被用來探討顯示於觀片箱及電腦螢幕之醫學影像的品質。在本研究中,我們發展出包括視覺系統及亮度差異之影像品質評估方法,以模擬的肺結癤及氣胸指出電腦螢幕之亮度對影像顯示品值的影響。0.4mm直徑的節癤在1500cd/平方公尺觀片箱及90cd/平方公尺電腦螢幕被偵測出時的亮度分別是0.0225及0.03。當亮度是0.0225,而節癤直徑由0.4mm到2.0mm時,頻率響應的主要部分由帶3移到帶5。對氣胸而言,當偵測面積減小時,主要部分則由較低頻帶移到較高頻帶。本研究指出若辨識疾病的主要依據是影像中的高頻訊號時,在電腦螢幕上偵測時會受到影響,觀片箱及電腦螢幕之亮度差異是主要的原因。 |
英文摘要 | To investigate the quality of the images displayed on light-boxes and computer monitors, the objective quality measures for image based on a model of the human visual system (HVS) have been studied. In the present study, a modified quality measure for image based on HVS model including luminance factor was developed. Simulated chest lesion patterns were used to demonstrate the influence of luminance on the quality of the image displayed on the computer monitor. The contrasts that resulted in a probability of 0.65 were 0.0225 for 1500 cd/m^2 and 0.03 for 90 cd/m^2 for a nodule with diameter of 0.4 mm. With contrast 0.0225, as the diameter of the nodule increased from 0.4 mm to 2.0 mm, the main component of the frequency response shifted from band 5 to band 3. For pneumothorax pattern, as the detection area becomes smaller, the main component moves from lower band to higher band. We concluded that the luminance difference between light-box and computer monitor contributed to the degraded image quality on computer monitor. Image objects contains high frequency component has lower detectability on computer monitor than on light-box. |
本系統中英文摘要資訊取自各篇刊載內容。