Read run-length encoding data from a table

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Jacopo Biasetti
Jacopo Biasetti 2022-7-9
编辑： Jan 2022-7-10
Hi,
I have the attached table where the second column (EncodedPixels) contains the run-length encoding of bounding box masks.
I wonder how to transform each row in the column EncodedPixels into double for subsequent manipulation.
Thanks,
Jacopo

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回答（2 个）

dpb
dpb 2022-7-9
Not sure what the next step(s) are, but to convert each row use something like
data=reshape(str2double(split(tT.EncodedPixels(i)).'),2,[]).';
where i=1:height(test_table)
You can probably avoid the above step by reading the data in in proper format as numeric from the beginning, though; I presume these came from some other input file? Show us the format for it and we can probably read directly into numeric array.
Jan
Jan 2022-7-10
编辑：Jan 2022-7-10
This is one of the files I would not import with readtable, but manually:
[fid, msg] = fopen(FileName, 'r');
assert(fid > 0, 'Cannot read file: %s', msg);
k = 0;
Header = fgetl(fid);
while ~feof(fid)
S = fgetl(fid);
if ~isempty(S)
k = k + 1;
[File, Value] = strtok(S, ',')
Data(k).File = File;
Num = sscanf(Value(2:end), '%g');
% Decode run-length encoded values:
Data(k).Value = repelem(Num(1:2:end), Num(2:2:end));
% Or maybe:
% ??? Data(k).Value = repelem(Num(2:2:end), Num(1:2:end));
end
end
fclose(fid);

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