Extraction of signatures from check background based on a filiformity criterion

—Extracting a signature from a check with patterned background is a thorny problem in image segmentation. Methods based on threshold techniques often necessitate meticulous postprocessing in order to correctly capture the handwritten information. In this study, we tackle the problem of extracting handwritten information by means of an intuitive approach that is close to human visual perception, defining a topological criterion specific to handwritten lines which we call filiformity. This approach was inspired by the existence in the human eye of cells whose specialized task is the extraction of lines. First, we define two topological measures of filiformity for binary objects. Next, we extend these measures to include gray-level images. One of these measures, which is particularly interesting, differentiates the contour lines of objects from the handwritten lines we are trying to isolate. The local value provided by this measure is then processed by global thresholding, taking i...

• Type: Journal
• Year: 1998
• Where: TIP
• Authors: Salim Djeziri, Fathallah Nouboud, Réjean Plamondon
• Keywords: Handwritten Lines, Necessitate Meticulous Postprocessing, TIP 1998, Topological Criterion Specific