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text-recognition-0014

Use Case and High-Level Description

This is a network for text recognition scenario. It consists of ResNext101-like backbone (stage-1-2) and bidirectional LSTM encoder-decoder. The network is able to recognize case-insensitive alphanumeric text (36 unique symbols).

Example

_images/openvino-2.jpg

-> openvino

Specification

Metric

Value

Accuracy on the alphanumeric subset of ICDAR13

0.8887

Accuracy on the alphanumeric subset of ICDAR03

0.9077

Accuracy on the alphanumeric subset of ICDAR15

0.6908

Accuracy on the alphanumeric subset of SVT

0.83

Accuracy on the alphanumeric subset of IIIT5K

0.8157

Text location requirements

Tight aligned crop

GFlops

0.2726

MParams

1.4187

Source framework

PyTorch*

Inputs

Image, name: imgs, shape: 1, 1, 32, 128 in the format B, C, H, W, 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.

Outputs

The net output is a blob with name logits and the shape 16, 1, 37 in the format W, B, L, where:

  • W - output sequence length

  • B - batch size

  • L - confidence distribution across alphanumeric symbols: #0123456789abcdefghijklmnopqrstuvwxyz, where # - special blank character for CTC decoding algorithm.

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

Use text-detection demo

Model is supported by text-detection c++ demo. In order to use this model in the demo, user should pass the following options:

-tr_pt_first
-tr_o_blb_nm "logits"

For more information, please, see documentation of the demo.

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