1. A computer implemented method, comprising: receiving data describing a first region of contact with a touch sensitive display, a second region of contact with the touch sensitive display, and a third region of contact with the touch sensitive display, the second region of contact being separate from the first region of contact and the third region of contact being separate from the first region of contact and the second region of contact; classifying the first region of contact as a touch point provided by a user's body part; classifying the second region of contact as incidental touch input provided by a user's resting body part; classifying the third region of contact as a stylus input; based on classification of the second region of contact as incidental touch input provided by a user's resting body part and classification of the third region of contact as a stylus input, defining an occlusion region based on the second region of contact and the third region of contact; determining a location of the touch point associated with the first region of contact; comparing the location of the touch point associated with the first region of contact to the occlusion region; based on comparing the location of the touch point associated with the first region of contact to the occlusion region, determining that the touch point associated with the first region of contact falls within the occlusion region; and based on the determination that the touch point associated with the first region of contact falls within the occlusion region, determining that the touch point associated with the first region of contact corresponds to incidental touch input.