Conference paper Open Access

One-image depth-from-focus for concentration measurements

Geißler, Peter; Jähne, Bernd


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    "description": "<p>A one-image depth-from-focus technique for the measurement of the concentration and size distribution of small particles is described. The technique is based on a precise knowledge of the 3-D point spread function and requires objects of uniform brightness and simple shapes. The true area of the object and the distance from the focal plane is obtained from parameters such as the apparent (blurred) area of the object and the mean brightness in this area. The technique has been applied to measure the size distribution of bubbles submerged by breaking waves. A depth criterion is used to define a virtual measuring volume that is roughly proportional to the size of the bubbles.</p>", 
    "license": {
      "id": "CC-BY-4.0"
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    "title": "One-image depth-from-focus for concentration measurements", 
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    "keywords": [
      "depth-from-focus", 
      "gas bubbles", 
      "bubble imaging"
    ], 
    "publication_date": "1995-03-22", 
    "creators": [
      {
        "affiliation": "Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University", 
        "name": "Gei\u00dfler, Peter"
      }, 
      {
        "affiliation": "Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University", 
        "name": "J\u00e4hne, Bernd"
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    "meeting": {
      "dates": "22-24 March 1995", 
      "place": "Zurich, Switzerland", 
      "title": " ISPRS Intercommission Workshop \"From Pixels to Sequences\""
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