Less then 8 bit data ?

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Adel Hafri 2022-3-11

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评论： Adel Hafri 2022-3-12

Hello, im coding Shanoon fanoo algorith rn which compressed images by changing the code of most occuring bits to smaller codes, but the problem is matlab always makes them int8, while i need to make them smaller then that, what's a workaround ?

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Answer 1

Walter Roberson 2022-3-12

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The newest "bit-sliced" computer that I can find (one able to index down to single bits) was 1981. I seem to have a memory of one designed in roughly 1984-ish, but it would be a fair strain to remember any details.

Basically, what you are asking to do has not been supported on computers in decades.

What people do instead is one of:

use byte arrays for all working calculations, and pack the bits into bytes when it comes time to write to file; Or
pack multiple bits into a single byte (or word or long word) by keeping track of the relative position and using arithmetic operations. In MATLAB, you can use bitset() and bitget()