In this work we present an end-to-end system for text spotting -- localising
and recognising text in natural scene images -- and text based image retrieval.
This system is based on a region proposal mechanism for detection and deep
convolutional neural networks for recognition. Our pipeline uses a novel
combination of complementary proposal generation techniques to ensure high
recall, and a fast subsequent filtering stage for improving precision. For the
recognition and ranking of proposals, we train very large convolutional neural
networks to perform word recognition on the whole proposal region at the same
time, departing from the character classifier based systems of the past. These
networks are trained solely on data produced by a synthetic text generation
engine, requiring no human labelled data.
Analysing the stages of our pipeline, we show state-of-the-art performance
throughout. We perform rigorous experiments across a number of standard
end-to-end text spotting benchmarks and text-based image retrieval datasets,
showing a large improvement over all previous methods. Finally, we demonstrate
a real-world application of our text spotting system to allow thousands of
hours of news footage to be instantly searchable via a text query.