Consider such things as resolution, brightness, straightness, and discoloration before you scan your text. Getting a quality image is the first step in having the best and most accurate OCR experience.
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For example, OCR software cannot recognize handwritten documents with any degree of accuracy. Sometimes, OCR software will not be helpful to use at all. Special fonts (typewriter), super small fonts (6pt), and low contrast text can all decrease the accuracy of the OCR software. Remember, software packages may boast between 97% and 99% accuracy, however, these rates are based on character errors, not word errors. Consider the 2 Factors Affecting Accuracy of OCR Consider the best format for your project based on who you want to have access to your text as well as how you could make it accessible to your intended audience. Keep in mind that making your text widely searchable is one of the main uses of OCR. In you planning for the uses of your output, you may have already considered the output file format of your final text document. How will the OCR software deal with each of these elements? What can you do to help the process go as smoothly as possible? De-skewing, cropping, etc. You should consider the structural elements of your text like the headings, images, tables, captions, and even the font and language. Understanding how the OCR software will handle your text is also an important consideration. Should it be a facsimile style representation of the full-text? Or, are certain standards required for the repository you may be sending the text to in the future? It is also important that all collaborators are on the same page in terms of requirements and expectations for the final product. You should consider the level of precision you wish to have in your final text.
Thinking through your intentions for the final OCR'd text will help you to create a final text that is rich in all of the appropriate ways.
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The editing/correcting process may take a considerable amount of time for large amounts of text and/or poor quality original text.įor more information on how to obtain a quality image, please consult the LibGuide on How to Use Digital Tools for Archival Research. You should be aware that if your goal is 100% text accuracy, you will need to check and correct the text after it has completed the original recognition process.
No special skills are required to use OCR software. If you do not have a digital document, or if what you have is poor quality, you are able to scan the original document using your OCR program as your scanning software. Typescript results in poorer OCR than printed type inconsistent use of font faces and sizes can lower OCR accuracy.Īn OCR software's ability to accurately analyze your document is dependent on the condition of the original and/or quality of the digital file. However, if the pages you are scanning are in different a different language, many OCR systems allow you to select the language of the document.ĭocuments with low contrast can result in poor OCR. Language: texts published before 1850 may not be the most compatible with OCR software. Older and discolored documents must be scanned in RGB mode in order to capture all of the image data. Skewed pages can lead to inaccurate recognition. The straightness of the initial scan can affect OCR quality. The recommended resolution for best scanning results for OCR accuracy is 300 dots per inch (dpi).īrightness settings that are too high or too low can have negative effects on the accuracy of your image.
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You can edit and save the file back to PDF format or can copy any text from it. Google Docs will now convert the PDF in an editable format automatically. Right-click on the file, hover select Open with, and click on Google Docs. You can access that by uploading the PDF file to Google Drive and opening it with Google Docs. Google Docs has a hidden OCR feature that most users don’t know about. Note that you need to upload the file online which may pose security and privacy risk though most web apps claim to delete files after a set period of time.
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Best Free OCR Software OnlineĮach web app has its pros and cons that we will list out clearly. The best part is that these free online OCR software are easy to work with. They are also platform-agnostic as all you need a browser. There are many OCR (Optical Character Recognition) software online that do a similar or better job without the hassle of installing an app on your computer. Now, you don’t need an app like Adobe Acrobat to extract text from images or PDFs.
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