Device and method for selective application of topical composition using dynamic threshold values

A method for selectively applying a composition to smooth appearance of a treatment surface of a subject, comprising:

• (i) analyzing, by a processing arrangement, image data corresponding to an imaged area of the treatment surface to determine an artifact magnitude of a location within the imaged area of the treatment surface;
• (ii) comparing, by the processing arrangement, the artifact magnitude of the location to a threshold value;
• and
• (iii) applying, by an applicator arrangement, a fixed amount of the composition to the location only when the artifact magnitude of the location exceeds the threshold value, wherein the fixed amount of the composition reduces the artifact magnitude by a fixed coverage level, the fix coverage level is less than the threshold value;
• (iv) repeating steps (i) through (iii) for a subsequent area of the treatment surface until a manual input is received from the subject via a user interface, the manual input indicating the subject desires further smoothing of the appearance of the treatment surface;
• (v) reducing the threshold value upon receiving the manual input, the reduced threshold value being greater than the fix coverage level;
• and
• (vi) repeating steps (i) through (v) for next areas of the treatment surface until a manual interruption is received from the subject.

A handheld device for selectively applying a composition to a treatment surface, comprising:

• an applicator arrangement applying a fixed amount of the composition to the treatment surface;
• a detector obtaining image data corresponding to an image of an area of the treatment surface;
• a user interface for obtaining from a manual input from a user;
• and
• a processing arrangement analyzing the image data to determine an artifact magnitude of a frexel within the area of the treatment surface, the processing arrangement directing the applicator arrangement to apply the fixed amount of the composition to the frexel when the artifact magnitude of the frexel is greater than a threshold value,
• wherein the fixed amount of the composition reduces the artifact magnitude by a fixed coverage level, and the fix coverage level being less than the threshold value,
• wherein the threshold value is reduced by the processing arrangement when the user interface receives the manual input, and the reduced threshold value being less than the threshold value, and
• wherein the processing arrangement directs the applicator arrangement to apply the fixed amount of the composition to a frexel in a next area of the treatment surface when an artifact magnitude of the frexel in the next area of the treatment surface is greater than the reduced threshold value.