Need for Specifying Best Font and Size for OCR
OCR is the abbreviation for Optical Character Recognition. The OCR technology, based on the concept of optical science, can read printed characters that are captured through a scanner, thereby converting them into parallel computer codes. But the OCR is a evolving technology and a common problem with the OCR software is that it sometimes misinterprets characters thereby generating errors in the digitized text. The scanned document to be processed by the OCR software needs clear images with proper contrast. If the characters look slightly broken or blurry due to bad image quality the recognition accuracy may go down by 20 percent. Even in clear images characters like "0" and "O" are often misread by the OCR software. Hence, specifying the best font and size for the OCR software becomes mandatory.
Best Font for OCR
Presence of a tangible style in characters of the scanned text is essential for accurate recognition by the OCR software. The early versions of OCRs used to interpret data from the printers. Thus the OCR devices were made to identify the printer specific font solely. However when more advanced OCR devices were designed in the subsequent period the necessity for specific, consistent and independent alphanumeric characters called fonts was realized. This led to the development of two fonts - OCR A and OCR B. These two are called the best fonts for OCR. These best fonts for OCR have contributed immensely in furthering the OCR technology. The style and readability of OCR A is versatile and go with every modern scanner. OCR B font is an enhancement of OCR A.
Best Font Size for OCR
Accurate OCR results are largely associated with usage of best font size, color, contrast and density of content. The best font size is 10 to 12 points. Smaller font sizes than this produce poor results. Again, font sizes that exceed 72 must be shunned as then the characters will be taken as images instead of text. To get good results presence of a proper contrast is needed, like dark text on a light background. The words and sentences in the text should have optimal space between them. The black and white images to be processed by OCR should be scanned at 300 dpi on the other hand 200 dpi is ideal for grayscale or color images.