A processor-implemented method, comprising: collecting an inspection sheet as input, via one or more hardware processors, by a document digitization system; performing, via the one or more hardware processors, a component localization of one or more line diagrams in the inspection sheet, by the document digitization system, wherein the component localization involves identification and classification of different machine zones in the one or more line diagrams, wherein the component localization comprises: performing a pixel level comparison of the inspection sheet with a plurality of template sheets stored in a database associated with the document digitization system, wherein said plurality of template sheets have one or more line diagrams with zones represented as contours, identifying at least one template sheet as matching with the inspection sheet; and identifying different machine zones in the inspection sheet, based on the contours defined in the template sheet that is identified as the template sheet matching with the inspection sheet; performing, via the one or more hardware processors, an arrow head-tail localization of the one or more line diagrams in the inspection sheet, by the document digitization system, wherein the arrow head-tail localization involves identifying arrow head and tail points in the inspection sheet, for all arrows present in the inspection sheet; performing, via the one or more hardware processors, text detection in the inspection sheet, by the document digitization system, wherein the text detection involves detection of all texts in the inspection sheet, and position of identified text with respect to one or more clusters in the inspection sheet; performing, via the one or more hardware processors, a text to arrow mapping, by the document digitization system, wherein the text to arrow mapping is based on the identified head and tail points of arrows and position of cluster in which the text is present; and performing, via the one or more hardware processors, a zone to arrow mapping, by the document digitization system, wherein the zone to arrow mapping is based on the identified head and tail points of arrows and machine zones identified during the component localization. collecting an inspection sheet as input, via one or more hardware processors, by a document digitization system; performing, via the one or more hardware processors, a component localization of one or more line diagrams in the inspection sheet, by the document digitization system, wherein the component localization involves identification and classification of different machine zones in the one or more line diagrams, wherein the component localization comprises: performing a pixel level comparison of the inspection sheet with a plurality of template sheets stored in a database associated with the document digitization system, wherein said plurality of template sheets have one or more line diagrams with zones represented as contours, identifying at least one template sheet as matching with the inspection sheet; and identifying different machine zones in the inspection sheet, based on the contours defined in the template sheet that is identified as the template sheet matching with the inspection sheet; performing, via the one or more hardware processors, an arrow head-tail localization of the one or more line diagrams in the inspection sheet, by the document digitization system, wherein the arrow head-tail localization involves identifying arrow head and tail points in the inspection sheet, for all arrows present in the inspection sheet; performing, via the one or more hardware processors, text detection in the inspection sheet, by the document digitization system, wherein the text detection involves detection of all texts in the inspection sheet, and position of identified text with respect to one or more clusters in the inspection sheet; performing a pixel level comparison of the inspection sheet with a plurality of template sheets stored in a database associated with the document digitization system, wherein said plurality of template sheets have one or more line diagrams with zones represented as contours, identifying at least one template sheet as matching with the inspection sheet; and identifying different machine zones in the inspection sheet, based on the contours defined in the template sheet that is identified as the template sheet matching with the inspection sheet; performing, via the one or more hardware processors, an arrow head-tail localization of the one or more line diagrams in the inspection sheet, by the document digitization system, wherein the arrow head-tail localization involves identifying arrow head and tail points in the inspection sheet, for all arrows present in the inspection sheet; performing, via the one or more hardware processors, text detection in the inspection sheet, by the document digitization system, wherein the text detection involves detection of all texts in the inspection sheet, and position of identified text with respect to one or more clusters in the inspection sheet; performing, via the one or more hardware processors, a text to arrow mapping, by the document digitization system, wherein the text to arrow mapping is based on the identified head and tail points of arrows and position of cluster in which the text is present; and performing, via the one or more hardware processors, a zone to arrow mapping, by the document digitization system, wherein the zone to arrow mapping is based on the identified head and tail points of arrows and machine zones identified during the component localization.