Single image evaluation

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The single image evaluation (single image rectification) describes a process that allows geometrical information to be derived from measurement images. Due to their central projection, the measurement images are unsuitable as a metric template, as the lengths, angles and surfaces that are tapped are strongly falsified. The causes are inclinations in the image and in the object as well as height differences in the object. By adding the information from a digital terrain model , the measurement image can be rectified (differentially) and converted into an orthophoto , which is possible using the following methods:

• graphic equalization (analog)
• Redrawing (analog)
• uniform optical equalization (analog)
• differential optical equalization (analytical)
• Single point equalization (numeric)
• Pixel transformation (digital)

Due to their rectification, orthophotos contain metric information between the image objects, which allows coordinates to be extracted.