# Line-level text detection with Surya

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In this tutorial we will perform line-level text detection using [Surya](https://github.com/VikParuchuri/surya) toolkit and OpenVINO.

![line-level text detection](https://github.com/VikParuchuri/surya/blob/master/static/images/excerpt.png?raw=true)

[**image source*](https://github.com/VikParuchuri/surya)


Model used for line-level text detection based on [Segformer](https://arxiv.org/pdf/2105.15203.pdf). It has the following features:
* It is specialized for document OCR. It will likely not work on photos or other images.
* It is for printed text, not handwriting.
* The model has trained itself to ignore advertisements.
* Languages with very different character sets may not work well.

#### Table of contents:
1. Fetch test image.
1. Run PyTorch inference.
1. Convert model to OpenVINO Intermediate Representation (IR) format.
1. Run OpenVINO model.
1. Apply post-training quantization using NNCF
    1. Prepare dataset
    1. Quantize model
1. Run quantized OpenVINO model
1. Interactive inference.

## Installation instructions

This is a self-contained example that relies solely on its own code.</br>
We recommend running the notebook in a virtual environment. You only need a Jupyter server to start.
For details, please refer to [Installation Guide](../../README.md).