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Digital Image Processing
Some Special Techniques Dithering
21/11/15 Duong Anh Duc - Digital Image Processing 1
Dithering
Dithering, also called Halftoning or Color Reduction, is the process of rendering an image on a display device with fewer colors than are in the image. (Mateus Pins and Hermann Hild)
The number of different colors in an image or on a device is used called its Color Resolution.
21/11/15 Duong Anh Duc - Digital Image Processing 2
Dithering
If the display device has a higher spatial resolution than the image that you are trying to reproduce, it can show a very good image even if its color resolution is less. This is what we will call `dithering` and is the subject of this work.
Dithering is a one-way operation.
Once an image has been dithered, although it may look like a good reproduction of the original, information is permanently lost.
Many image processing functions fail on dithered images.
21/11/15 Duong Anh Duc - Digital Image Processing 3
Dithering
21/11/15 Duong Anh Duc - Digital Image Processing 4
Dithering
Grey-scale and colour simulation
Dithering on a screen or printer is analogous to the half-toning techniques used in the print industry.
A CRT can be considered to be a complex colour “dithering” device with variable colour intensity.
21/11/15 Duong Anh Duc - Digital Image Processing 5
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