Image Resizing Using Oblique Projection B-Spline with Sharpness Preserving
带锐度保持的斜投影B—样条图像缩放

Image resizing plays an important role in image processing and the corresponding methods are widely used in various kinds of image processing software. Recently, oblique projection based B-Spline image resizing has been developed. Compared to conventional image resizing methods such as the nearest neighbor interpolation, bilinear interpolation, and bicubic spline interpolation, this method performs better. The resized image using oblique projection method has more continuity than using other methods.For the same reason, the resized image is smoothed at the same time, especially at the places where exist sharp edges. Thus, some important information lying in the area is lost. This result is unexpected in image processing. In this paper, a sharpness preserving method in the procedure of image resizing is proposed in order to overcome the shortcoming of oblique projection B-Spline image resizing mentioned above.In the new method, the range of integral of an output pixel is changed when there are sharp edges including in the corresponding source pixels,thus the sharpness of the output pixel can be preserved. Results show that the method performs better in both continuity and sharpness preserving.