(1) Old Halftoning scheme is not good for displaying different levels based on required number of stipples. Scaling the original image is a fast way to keep partial structure.
(2) Still based on halftoning, to find a good way to select important dots.
(3) Modify halftoning to have it matched with varying-size dots
(4) If using edge or gradient information to manage the orders, ....
2. Tone can be represented a little as an enhancement.
(1)After having good structure for stippling, tone as an enhancement
(2) A little would work.
3. Some global preservation: intensity compared with the original image and the structure
To have control over the possible number of dots
Fewer dots reduce intensity???? Does this prove our scaling method?
4. Some local properties:
(1) dot sizes:
Big dots are rare except typeIII.
Varying sizes are rare except typeIII.
a little change of size would be fine.
Thus, the range of dot sizes should be small(floating points: twice). It should based on the intensity.
Some problems from varying sizes (ramp, uniform, and edges): e.g. for a uniform region, if based on the black coverage of the dots to determine the intensity of an area, bigger dots need fewer number to cover an region than smaller dots need, which makes region with smaller dots having more blank space between dots. Will the visualization from smaller dots appear lighter even the value of intensity is same?
(2) intensity: besides black and white, introduce greyscale as an makeup. It is rare, but can be as an additional effect.
(3) density: based on the number of dots in a unit area? or based on the blank space.
Should be evenly spaced
(4) dot shape
5. Time tolerated
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