How to estimate the measurement of antique jade from a photo?

Measurements are necessary elements to identify Chinese antique jade.

What is the size and/or weight of the object? Specify which unit of measurement is being used (e.g. cm, in.) and to which dimension the measurement refers (e.g.y height, widths depth).

An objects measurements greatly assist identification. All measurements need to be recorded as accurately as possible, since inaccurate information might prevent an object from being identified. If accurate measurements are not possible——for example, if the description is made after the theft and the measurements must be estimated from a photograph—the information should include qualification (e.g., approximately 175 cm, 50 cm [estimated]).

primary_measurementIn order to facilitate the estimation, statistical analysis and mathematics will help. Detail description will be provided later.

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