A method of user interaction in augmented reality comprises the steps of capturing a video image of a scene, and for each pixel in at least a sub-region of the captured video, classifying the pixel as either a skin or non-skin pixel responsive to whether the color of the pixel exceeds a predetermined threshold purity of red; and generating a mask based upon the classification of the pixels of the captured video, generating an augmentation image layer to superpose on the captured video image, and limiting a mode of combination of the captured video and the augmentation image layer, responsive to the mask.