Comments (4)
There is no hard limit to the line length. The length is limited by the available system memory.
What do you mean by 'number of time-steps'?
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@ChWick
By "number of time-steps", I refer to the x-axis of the input matrix to CTC.
The y-axis is the softmax results, and the x-axis (time domain) is the possible character positions.
Assume one potential character position corresponds to one time-step.
I want to know the number of potential character positions.
In other words, I need to know the length of a CTC encoded sequence.
(The length of the decoded sequence is the same as the length of the ground truth text line.)
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The dimension of the input matrix to the CTC is (if no pooling is used) equals to the size of the original image after rescaling it to the desired input height + some padding (5px). 2x2 Pooling halves the size.
E. g. image size 400x96 => 200x48 (scale to line height of 48) => 210x48 (with padding) => 105x24 (pooling).
However, the positions of each single predicted character related to the original image are stored for each prediction (or use --extended_prediction_data
).
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@ChWick Thank you for the detailed explanation.
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