Blending Bilaterally Filtered Oil Painting Expression Techniques and Stylistic Rendering of Calligraphy Strokes Combining the Background of Visual Importance

To transform real images into an oil painting style, a bilateral filtering algorithm based on the background of visual importance is proposed. Firstly, the improved bilateral filtering and mathematical morphological operations are combined to a multilayer reference image sequence with a pyramid structure according to the features of oil painting drawing. Subsequently, the stroke layout algorithm based on the visual importance diagram is proposed. The human face, visual focus detection, and other methods are used to detect the influential region. In addition, the starting point of brush drawing, the improvement of direction calculation accuracy, and the enhancement of the image texture boundaries are performed according to the information of these regions to implement the oil painting expression techniques and achieve the highlight effect of the stylistic rendering contents of calligraphy strokes. The experimental results suggest that the bilateral filtering algorithm can be used to achieve relatively good visual effects in the background of visual importance.