Fig. 11From: Acquisition of a single grid-based phase-contrast X-ray image using instantaneous frequency and noise filteringImages produced by the TV-L1 denoising and proposed filters. The top row presents the image before filtering: a–c images from the TV-L1 denoising filter with a lambda of 0.1, 1.0, and 2.0, respectively, and 100 iterations and d image from the proposed filterBack to article page