Methods and systems for compression of digital images (still or motion sequences)
are provided wherein predetermined criteria may be used to identify a plurality
of areas of interest in the image, and each area of interest is encoded with a
corresponding quality level (Q-factor). In particular, the predetermined criteria
may be derived from measurements of where a viewing audience is focusing their
gaze (area of interest). In addition, the predetermined criteria may be used to
create areas of interest in an image in order to focus an observer's attention
to that area. Portions of the image outside of the areas of interest are encoded
at a lower quality factor and bit rate. The result is higher compression ratios
without adversely affecting a viewer's perception of the overall quality of the image.