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This article describes a method of digital coding by skipping white in the transmission or storage of two-tone images.
English (United States)
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White Block Skipping Coding Of Two-Tone Images
This article describes a method of digital coding by skipping white in the
transmission or storage of two-tone images.
In most two-tone images the amount of black is usually a very small fraction
of the image, and an efficient method of coding these images is to skip the white
space of the image and transmit (or store) only the black.
The image is sequentially scanned, and the black and white sample pattern
of each scanned line is converted into a bit pattern (a white sample as "0" and a
black sample as "1").
Each scanned line bit pattern is divided into N-bit blocks.
Each block is associated with a status bit whose value is defined as
followsThe status bit is a "0" when all the bits of the block are
The status bit is a "1" when at least one bit of the block is
When the status bit is a "0", only the status bit is transmitted.
When the status bit is a "1", the status bit and the associated
block are transmitted.
Most lines terminate in a white space, and the above algorithm can be
improved by associating an "end-of-line" bit with each significant transmitted
block. The end-of-line bit is a "1" when all the remaining bits of the line are "0".
When the end of line is a "1", the blocks which follow that associated with the
end-of-line bit are not transmitted.