Fig. 1. Images of butterfly. (a) Original image; (b) image with noise; denoised images using (c) TV model; (d) ATV model; (e) TGV model, and (f) DFTV model

Fig. 2. Image of pepper. (a) Original image; (b) image with noise; denoised images using (c) TV model; (d) ATV model; (e) TGV model, and (f) DFTV model

Fig. 3. Enlarged drawing. (a) Image of pepper with noise; (a1) enlargement of red box in (a); denoised (a1) using (a2) TV model, (a3) TGV model, and (a4) DFTV model; (b) image of butterfly with noise; (b1) enlargement of red box in (b); denoised (b1) using (b2) TV model, (b3) TGV model, and (b4) DFTV model

Fig. 4. Image of airfield. (a) Original image; denoised images using (b) TV model, (c) ATV model, (d) TGV model, and (e) DFTV model

Fig. 5. (a) Image of airfield; (b1) enlargement of blue box in (a); denoised (b1) using (b2) TV model, (b3) ATV model, (b4) TGV model, and (b5) DFTV model; (c1) enlargement of red box in (a); denoised (c1) using (c2) TV model, (c3) ATV model, (c4) TGV model, and (c5) DFTV model; (d1) enlargement of yellow box in (a); denoised (d1) using (d2) TV model, (d3) ATV model, (d4) TGV model, and (d5) DFTV model

Fig. 6. PSNR of different models

Fig. 7. SSIM of different models

Fig. 8. Consuming time of different models