数码成像结合IPP软件测量白斑面积的影响因素分析

The Factors Influencing the Measurement of the Lesions Area by The Method of Combining Digital Imaging and IPP Software

目的探讨数码成像结合image-pro-plus(IPP)软件测量白斑面积的影响因素。方法用数码相机在不同光线、距离、角度、像素、是否设置为变焦状态、参照标签与白斑间距不同的6种情况下,采集模拟白斑纸片的照片,每组实验重复3次,并用IPP软件求得模拟白斑的面积,SPSS13.0软件包分析数据。结果不同光线、参照标签放置距离、角度、像素和变焦设置下测得的白斑面积差异均有统计学意义(P均<0.05)。去除20cm和25cm后,两种光线条件下测得纸片面积差异无统计学意义(P=0.106);不同距离拍摄所测得纸片面积差异有统计学意义(P=0.002)。30～50cm和35～105cm间差异均无统计学意义(P均>0.05)。结论数码相机拍照时,参照标签应尽量与皮损置同一平面,且前者所在平面与皮损平面距离应<2cm;拍摄距离为60～90cm时自然光和日光灯下均可拍摄,尽量与皮损平面垂直拍摄和选择高分辨率数码相机和固定相机象素,并允许变焦。

Objective To analyze the influential factors to the white spot area which measured by combining digital im- aging with image-pro-plus. Methods The simulated photos captured in different lights, distances, angles, pixels, zoom states, and reference to the spacings between the label and white spot . Then each group like this in different conditions repeated for three times. And with the SPSS13.0 software package to analyse the datas that are concluded from the spot areas which through image-pro-plus software measuring function, Re- suits The differences among the groups at different angle conditions had the statistical significance （P = 0. 000）. The differences between the two groups at twodifferent camera pixels had the statistical significance （P = 0. 000）. The differences between the two groups at different zoom setting condition reference and the spots had the statistical significance （ P = 0. 000）. The differences between the two groups at two kinds of l/ght conditions in certain extent of distance had the statistical significance （ P = 0. 027）, but if apart from 20cm and 25cm, the differences aren＇ t significant （P = 0. 106）. The differences among the groups at differ- ent distances are of statistical significance（ P = 0. 002）, but the two groups between 30cm and 50cm, 35cm and 105cm have to be excluded by the contrastion of SNK. Conclusion Firstly, the distance between refer- ence tags and lesions is no more than 2cm and placing reference tags in the plane of lesions is the best;Sec- ondly, the distance between lesions and camera should be controlled at the 60cm ～ 90cm ; Thirdly, the photo can be taken in both natural light and daylight condition, and shooting in the vertical orientation ;Fourthly, the camera should have a hizh resolution, and remains a pixel, and allows zoom.