Use Case and High-Level Description

This is a network for text recognition scenario. It consists of VGG16-like backbone and bidirectional LSTM encoder-decoder. The network is able to recognize school marks that should have format either <digit> or <digit>.<digit> (e.g. 4 or 3.5).


-> Mark2.5


Metric Value
Accuracy (internal test set) 98.83%
Text location requirements Tight aligned crop
GFlops 0.792
MParams 5.555
Source framework TensorFlow


Shape: [1x1x32x64] - An input image in the format [BxCxHxW], where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Note that the source image should be tight aligned crop with detected text converted to grayscale.


The net outputs a blob with the shape [16, 1, 13] in the format [WxBxL], where:

  • W - output sequence length
  • B - batch size
  • L - confidence distribution across the alphabet: "0123456789._#", where # - special blank character for CTC decoding algorithm and the character ‘’_'` replaces all non-numeric symbols.

The network output can be decoded by CTC Greedy Decoder or CTC Beam Search decoder.

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