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Background The morphological analysis of olive leaves, fruits and endocarps may represent an efficient tool for the characterization and discrimination of cultivars and the establishment of relationships among them. In recent years, much attention has been focused on the application of molecular markers, due to their high diagnostic efficiency and independence from environmental and phenological variables. Results In this study, we present a semi-automatic methodology of detecting various morphological parameters. With the aid of computing and image analysis tools, we created semi-automatic algorithms applying intuitive mathematical descriptors that quantify many fruit, leaf and endocarp morphological features. In particular, we examined quantitative and qualitative characters such as size, shape, symmetry, contour roughness and presence of additional structures such as nipple, petiole, endocarp surface roughness, etc.. Conclusion We illustrate the performance and the applicability of our approach on Greek olive cultivars; on sets of images from fruits, leaves and endocarps. In addition, the proposed methodology was also applied for the description of other crop species morphologies such as tomato, grapevine and pear. This allows us to describe crop morphologies efficiently and robustly in a semi-automated way. Electronic supplementary material The online version of this article (10.1186/s13007-017-0261-8) contains supplementary material, which is available to authorized users.

In Greece, a small peripheral European economy, the service sector and shipping in particular played a highly important role in nineteenth-century economic development. Despite its importance, however, the difficulty of calculating the ‘invisible earnings’ from the shipping industry's engagement in international activities has led to its underestimation in most analyses of the country's economic growth. This article presents the first estimation of Greek shipping income in the nineteenth century. In addition, it examines the shipping industry within the context of Greek development as a whole, highlighting its significant role in the fully marketized and integrated area of the country's economy in the context of a wider world economy.