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How to extract object dimensions from an image without camera coordinates?

How to extract object dimensions from an image without camera coordinates?
  1. Is there an app that can measure from a picture?

Is there an app that can measure from a picture?

Photo Measures is the perfect app to help you save and share measures and dimensions on your own photos. Moving to a new place? Take some photos and note down the dimensions on the photos to remember the exact layout, and to make sure that everything will fit easily.

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Measurement of blocking artifacts in images
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