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DotCode represents data in rectangular structure which consists from black round dots and white spaces on white background or white round dots on black background. DotCode does not have finder pattern, like other 2D barcodes and it must be detected with slow blob detection algorithms like Gabor filter or Circle Hough Transform.
It is constructed by superimposing white discs on the intersections of orthogonal gray bars on a black background. Dark dots seem to appear and disappear rapidly at random intersections, hence the label "scintillating". When a person keeps their eyes directly on a single intersection, the dark dot does not appear.
Using this convention, a grayscale depth map for the example autostereogram can be created with black, gray and white representing shifts of 0 pixels, 10 pixels and 20 pixels, respectively as shown in the greyscale example autostereogram. A depth map is the key to creation of random-dot autostereograms.
Chroma dots were once regarded as undesirable picture noise, but recent advances in computer technology have allowed them to be used to reconstruct the original colour signal from black-and-white recordings, providing a means to re-colour material where the original colour copy is lost. Example of the chroma dot reconstruction:
square with left half black white circle with upper right quadrant 7 ◗ ... white up-pointing triangle with dot: : black medium square c ◜ ◬
Detail from Seurat's Parade de cirque, 1889, showing the contrasting dots of paint which define Pointillism. Pointillism (/ ˈ p w æ̃ t ɪ l ɪ z əm /, also US: / ˈ p w ɑː n-ˌ ˈ p ɔɪ n-/) [1] is a technique of painting in which small, distinct dots of color are applied in patterns to form an image.
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Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.