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Regional Water Supply Company (PDAM) Tirta Je'ne Berang Gowa Regency is one ofthe regional-owned business units engaged in the distribution of clean water to the general public,especially in the Regency of Gowa. In this case PDAM Gowa Regency always tries to servecustomers as well as possible and provide satisfaction to customers. But in the process of paymentevery month by customers, there is often a problem, a lot of bills that have not been paid bycustomers of PDAM Gowa Regency. Optical Character Recognition (OCR) is very possible to beimplemented in this problem. OCR can recognize an image and immediately recognized as inputwhich can then be used as computer data and directly calculated. The Sobel Edge Detectionmethod has the advantage of reducing noise before performing edge detection calculations. Theresults of testing the system directly using an application program that has been created becauseit allows software developers to create a set of input conditions that will train all the functionalrequirements of a system with valid data results.Keywords—Sobel Edge Detection, Sms Gateway, PDAM
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