Text recognition software explained pdf#
Text recognition software explained code#

Saving results to the selected output format, for example, searchable PDF, DOC, RTF, or TXT.

Some characters like '1' and 'I', 'C' and 'G' can look very similar, and the dictionary can help to make the decision. This step can improve the recognition quality.

Text recognition software explained code#

For example, recognition of the image of the 'I' character can produce the codes for 'I', '|', '1', 'l' the final character code will be selected later. Sometimes this algorithm produces several character codes for uncertain images. An image of every character must be converted to the appropriate character code. It is necessary to detect such cases and find the correct position of every character.

Oftentimes, some characters are broken into several parts, or some characters touch each other. Sometimes it is not an easy task because of different font sizes and small spaces between words. The OCR system must detect the positions and types of all important areas in the image. Page layout analysis (also called 'zoning').This step is required to improve page layout analysis, to achieve better recognition quality for underlined text, to detect tables, etc. The process is called 'binarization.' This step is very important, because incorrect binarization will cause a lot of problems. Many OCR algorithms can handle bi-tonal images only, so color or grayscale images must be converted to bi-tonal.Image can be skewed, or it can have a lot of noise, so deskewing and denoising algorithms are applied to improve the image quality.Many OCR algorithms expect a predefined range of font sizes and foreground/background colors, so the image must be rescaled and inverted before processing if necessary. Detecting the most important image features, such as resolution and inversion.

Text recognition software explained pdf#

It must also support PDF files, because many documents are stored as images in the PDF format, and the only way to extract text from such files is to perform OCR. Moreover, a good OCR system must understand a lot of image formats: BMP, TIFF (both one-page and multi-page images), JPEG, PNG, and so on. The source can be a file or a pointer to a memory block. Loading an image as bitmap from a given source.The general steps in the OCR process are as follows: Every step is a set of related algorithms that do a piece of the OCR job. How do the modern OCR technologies work? The process of converting an image to an editable document is divided into several steps. The most advanced OCR systems can handle almost any types of images, even such complex ones as scanned magazine pages with images and columns, or photos from a mobile phone. This technology is widely used in many areas. OCR allows you to process scanned books, screenshots, and photos with text, and get editable documents like TXT, DOC, or PDF files. OCR is a complex technology that converts images containing text into formats with editable text. Optical Character Recognition (OCR) вЂ“ How it works