Regional Contrast Manipulation for Portrait Photograph Enhancement
This chapter proposes a method to manipulate the regional contrast in snapshot style portrait photographs by using pre-modern portrait paintings as aesthetic examples: to improve the visual appeal and focus of attention of the photographs. The example por
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Regional Contrast Manipulation for Portrait Photograph Enhancement
Abstract This chapter proposes a method to manipulate the regional contrast in snapshot style portrait photographs by using pre-modern portrait paintings as aesthetic examples: to improve the visual appeal and focus of attention of the photographs. The example portrait painting is selected based on a comparison of the existing contrast properties of the painting and those of the photograph. The contrast organisation in the selected example painting is transferred to the photograph by mapping the inter- and intra-regional contrast values of the regions, such as the face and skin areas of the foreground figure, the non-face/skin part of the foreground and the background region. A novel piecewise nonlinear transformation curve is used to achieve this contrast mapping. Finally, the transition boundary between regions is smoothed to achieve the final results. Experimental results demonstrate that, by using this proposed method, the visual appeal of portrait photographs is effectively improved and the face and the figure become more salient. Keywords Portraits · Painting · Photographs
7.1 Introduction Most existing approaches in image editing improve the appearance of images globally or locally in the same way for all image categories, regardless whether it is a portrait or a natural scene. Similar to the photographer’s strategy of using different modes or lenses to capture landscapes or portraits, different kinds of photographs have different subject focus and different formal needs, and therefore need to be edited in different ways. This chapter addresses the specific genre of portrait photographs which are photographs that depict a person. Whether you are travelling, enjoying a family event or recording your glory moment, everyone ends up shooting portraits. Portrait photographs constitute an important part of our personal photograph collection.
© Springer Nature Singapore Pte Ltd. 2018 X. Zhang et al., Computational Approaches in the Transfer of Aesthetic Values from Paintings to Photographs, DOI 10.1007/978-981-10-3561-6_7
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7 Regional Contrast Manipulation for Portrait Photograph Enhancement
Fig. 7.1 a ‘Portrait of Mariana Waldstein’, by Francisco de Goya (1746–1828). b ‘Mrs. Peter William Baker’ by Thomas Gainsborough (1727–1788). Courtesy Wikimedia Commons. c and d are photographs. Image d is cropped from an image in MIT-Adobe FiveK Dataset [2]
In a portrait, the figure, especially the face, is of prime importance. However, the key to controlling the strength of the attraction of a portrait is not by just controlling the absolute value of the region of interest, but rather the contrast between and within the face and skin areas of the foreground figure, the non-face/skin part of the foreground figure with its accessories and the background [21]. The management of this network of contrast serves to make the figure and face standout. Therefore, the proposed portrait photograph enhancement method does not solely focus on the enhancemen
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