The gray feature, the shape feature, and the texture feature are analyzed.The differences among the text, the table, the figure, and the image on document images are studied.

• 摘要对文本图像的灰皮、形状和纹理等视觉特征进行了较为全面的分析，研究了版面中文本、表格、图形和图像在各种特征层面上的差异。