[Retracted] DTFA-Net: Dynamic and Texture Features Fusion Attention Network for Face Antispoofing

Figure 6

Optical flow visualization of two adjacent face regions: (a) visualization of changes in optical flow direction: hue = direction of optical flow, saturation = 255, and value = 255; (b) optical flow magnitude visualize: hue = 255, saturation = 255, and value = size of optical flow. Among them, the left two are the optical flow changes in the real face, and the right two groups are the optical flow changes in the photo attacks.

(a)

(b)