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In India there are many organizations/institutions committed for protection of ancient palm leaf manuscripts  in order to store our precious knowledge writings. As the time passes by, these palm leaves are getting spoiled by artificial and natural elements. With the growing technology worldwide, we are aimed to digitize all these palm leaf manuscripts which are available in our university library. One such objective is to develop an efficient image processing system for effective retrieval of metadata automatically from these manuscripts. Many image processing techniques have been proposed for the efficient data retrieval. Some of the techniques include image enhancement, segmentation, processing, restoration, compression and acquisition. All these techniques have various algorithms which are implemented successfully with desired results. Since one hundred percent correct recognition rate is impossible with noise and other distorted mediums determining the right technique for image processing is very difficult. So, this paper contains information about some image processing techniques and algorithms applied on palm leaf manuscripts proposed by different authors for successful data retrieval.
Palm Leaf Manuscripts; Digitizing; Cataloguing; Metadata; Digital Image Processing; Automatic Extraction
Manuscript means any information that is hand written. It is generally related to ancient writings of the past men. Palm leaflets  are one of the oldest and cheapest materials used for writing. Palm leaf manuscripts (Figure 1) are produced from two main types of palms namely palmyra and talipot. Although palm leaf manuscripts size differs among other parts of the world, the standard size is 48 and 4 centimeters in length and width.
As the time passed by many palm leaves are under severe extinction from various other external elements such as dampness, fungus, ants and cockroaches and many more. SCSVMV University started preserving its Palm Leaf Manuscripts for future generations and made them available in the university library by digitizing then and storing them accordingly. It has a collection of ~5000 manuscripts collected from various sources. The collection mostly comprises of manuscripts written in Grantha Script (~80%) which belong to Tamil, Telugu, Hindi, Kannada, and Malayalam languages.
Fig.1. Palm Leaf Manuscript (Source: Manuscripts Section, SCSVMV University)
Each bundle of leaves is usually tied together with cord threads through two holes pierced through the entire manuscript by the insertion of bamboo strips. The resultant bundle is completed by adding the heavy wooden covers at the either sides of the leaves, also tied by the cords or wrapped with a soft textile cloth. The total number of manuscripts available in SCSVMV University manuscripts section can be visualized in Fig 2.
Although a lot of research works exist in the field of image processing in context with palm leaf manuscripts, but there is a need to prepare an efficient database (DB) for the automation and digitalisation of these manuscripts which can be accessed by all the researchers worldwide (such as a manuscripts DB). All the techniques discussed above gave good results but more work has to be done on Indian languages due to large character set and linguistic features. From this study, few data sets of manuscripts are used for obtaining the test results but there is a need to train and test huge data sets.
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