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OpenCV Essentials by Jesus Salido Tercero, Julio Alberto Patón Incertis, Ismael Serrano Gracia, Gloria Bueno García, Noelia Vállez Enano, Mª del Milagro Fernández Carrobles, Oscar Deniz Suarez

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Scene text detection

The scene text detection algorithm builds a component tree of an image by thresholding it step-by-step from 0 to 255. To enhance the results, this process is done for each color channel, intensity, and gradient magnitude images. After that, the connected components obtained from successive levels are hierarchically organized depending on their inclusion relationship as shown in the following diagram. This tree organization may contain a huge number of regions:

Scene text detection

Tree organization example

Thus, the algorithm selects some regions following two stages. Firstly, area, perimeter, bounding box, and Euler number descriptors are computed ...

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