Writing Resources
Optical Scanning Optical scanning is the first phase in OCR As the first step a digital image of the original image will be captured The optical scanners which are used in OCR contains a transport mechanism and a sensing device The scanned image is usually a black print on a white background When OCR process occurs on the image it will convert multi level image onto bi level image This process in known as thresholding 24 Thresholding process is very important in OCR and also a fixed threshold is used there But in the practical scenario it is needed have advanced methods for thresholding Because it matters to achieve a good result Thresholding is performed on the scanner with the purpose to save memory space and computational effort 24 Preprocessing Segmentation Segmentation considered as the third phase in OCR Purpose of this phase is to define the elements of a pre processed image It is done be separating an individual image into sub images with individual characters in them In the OCR process it is needed to identify the areas where the texts are printed and also to differentiate them from figures and graphics as well Some problems can be occured in the segmentation phase Those problems can be divided into 4 categories
