The method divides the background of fingerprint image into two layers: outboard black area and inboard tint area.
该方法将指纹图像的背景分为两层：外层黑色背景区域和内层浅色背景区域。
Tint fine thread could be found in dark background after negative staining observed by TEM.
透射电镜下，经负染后，在深色的背景中间可见浅色细丝状。
Tint fine thread could be found in dark background after negative staining observed by TEM.
透射电镜下，经负染后，在深色的背景中间可见浅色细丝状。
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