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Signal Process."],"published-print":{"date-parts":[[2013,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>Hand posture recognition is generally addressed by using either <jats:italic>YC<\/jats:italic>\n            <jats:sub>\n              <jats:italic>b<\/jats:italic>\n            <\/jats:sub>\n            <jats:italic>C<\/jats:italic>\n            <jats:sub>\n              <jats:italic>r<\/jats:italic>\n            <\/jats:sub> (luminance and chrominance components) or <jats:italic>HSV<\/jats:italic> (hue, saturation, value) mappings which assume that a hand can be distinguished from the background from some colorfulness and luminance properties. This can hardly be used when a dark hand, or a hand of any color, is under study. In addition, existing recognition processes rely on descriptors or geometric shapes which can be reliable; this comes at the expense of an increased computational complexity. To cope with these drawbacks, this paper proposes a four-step method recognition technique consisting of (i) a pyramidal optical flow for the detection of large movements and hence determine the region of interest containing the expected hand, (ii) a preprocessing step to compute the hand contour while ensuring geometric and illumination invariance, (iii) an image scanning method providing a signature which characterizes non-star-shaped contours with a one-pixel precision, and (iv) a posture classification method where a sphericity criterion preselects a set of candidate postures, principal component analysis reduces the dimensionality of the data, and Mahalanobis distance is used as a criterion to identify the hand posture in any test image. The proposed technique has been assessed in terms of its performances including the computational complexity using both visual and statistical results.<\/jats:p>","DOI":"10.1186\/1687-6180-2013-167","type":"journal-article","created":{"date-parts":[[2013,11,5]],"date-time":"2013-11-05T21:00:25Z","timestamp":1383685225000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Hand posture recognition using jointly optical flow and dimensionality reduction"],"prefix":"10.1186","volume":"2013","author":[{"given":"Nabil","family":"Boughnim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julien","family":"Marot","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Caroline","family":"Fossati","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Salah","family":"Bourennane","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,11,5]]},"reference":[{"key":"556_CR1","doi-asserted-by":"publisher","first-page":"189","DOI":"10.1006\/cviu.2002.0967","volume":"85","author":"Y Zhu","year":"2002","unstructured":"Zhu Y, Xu G, Kriegman DJ: A real-time approach to the spotting, representation, and recognition of hand gestures for human-computer interaction. 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