Method for using viewing time to determine affective information in an imaging system

1. A method for providing image metadata for still digital images captured by a user and stored in respective digital image files in an imaging system, comprising:

a) sequentially displaying on an electronic display the still digital images from their respective digital image files for viewing by the user;

b) electronically monitoring the time intervals during which the user views each of the still digital images on the electronic display, wherein the time intervals are determined by the user;

c) using the time intervals to determine the degree of interest for each of the stored still digital images;

d) storing image metadata indicating the degree of interest for each of the still digital images in their respective digital image files; and

e) subsequently using the metadata stored in each respective digital image file to assist in retrieving one or more still digital images.

2. The method of claim 1 wherein the degree of interest is determined by relating the viewing time duration for each still digital image with the average viewing time duration for all of the still digital images.

3. The method of claim 1 further including the step of monitoring the facial expression of the user.

4. The method of claim 3 wherein the smile size of the user is determined for each of the still digital images.

5. The method of claim 4 wherein a degree of preference is determined for each of the still digital images by relating the smile size corresponding to each still digital image to an average smile size.