Image into text transformation
We can distinguish the two most important stages when it comes to extracting text from an image. The first is to teach the AI algorithm to recognize text; the second is to transform it into another form (text file).
TEXT RECOGNITION WITH ML
The first step is to teach the computer to recognize text. The difficulty of this task depends on the quality of the image. The most common text recognition technique is Optical Character Recognition.
The OCR technology is an advanced tool that converts text in images into editable text. Its main purpose is to enable computers to recognize and process text characters from images. This, in turn, enables effective editing, searching, and analysis of the contained data. But how does OCR technology work? The following four are essential steps in this process.
The first step is to acquire an image containing text, which can be done using a scanner, digital camera, or other device. This process converts the image into binary data, where it assigns pixels as black or white based on the light intensity. This makes it possible to distinguish text from the background.
Now, the image undergoes preprocessing to enhance its readiness for OCR. This process includes noise removal, contrast adjustment, rotation correction, and other operations. In such a way, the image is prepared for accurate text recognition.
OCR software uses various methods to recognize characters in an image. It could be
Pattern Matching. In this method, the sign image is compared to a sign pattern with a similar font and scale. This is effective for familiar fonts and standard scales, such as those found in typed documents.
Feature Extraction. This method breaks down characters into basic features such as lines, loops, directions, and intersections. The software compares these extracted features with known patterns.
After recognizing the characters, the next step is to analyze the layout and process the results further to enhance accuracy. This includes error correction, managing ambiguous characters (when OCR is not sure what was recognized), and other operations to improve the accuracy of the transformed text.
TEXT EXTRACTION WITH ML
Text extraction involves using ML technology to automatically analyze text. The goal is to find important words and phrases from unstructured data, like news, articles, or surveys. Extraction methods use various ML algorithms. We can, therefore, divide them into five main methods.
The regional method uses a sliding window to identify text in different types of images. This strategy is based on a variety of factors such as color, shape, contour, geometric features, and edges.
The texture-based method is based on the use of different types of textures and their properties to extract text from an image.
The hybrid technique is a combination of two previous methods.
Initially, a region-based approach detects the text, and then a texture method extracts all features from the text region.
The edge-based method focuses on detecting the edges of letters and numbers, aiming to achieve a clear contrast between text and background.
The morphology-based method is used to extract text features from an image after properly processing the image.
The article discusses innovations in transforming images into text using ML. This process focuses on two key stages: text recognition and text extraction. OCR technology is a popular method of turning text in images into editable text. Additionally, various methods for extracting text from images using machine learning are discussed. These are regional, texture-based, hybrid, edge-based, and morphological approaches.
Many sectors benefit from the transformation of images into text, such as medicine and finance. As technology advances, companies will be able to reap even greater benefits.
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