Decoding algorithm for n-frequency coding structured light

The invention discloses a decoding algorithm for n-frequency coding structured light, and belongs to the technical field of structured light three-dimensional measurement. The decoding algorithm comprises the following steps: firstly, computing the periodicity of the n-frequency coding structured light within a measurement range, and then computing a phase principal value corresponding to a space position x; secondly, structuring an array and computing the values of the array in all situations; on such basis, searching for an array value of which all elements have the same numerical value, and recording the corresponding periodicity; finally, computing the value of the space position x. The decoding algorithm is applicable to the decoding of not only double-frequency coding structured light but also multiple-frequency coding structured light.