Technical term used in mathematics, signal processing, and computer graphics for estimating values between known data points.
In image processing, interpolation can be used to increase resolution.
This function performs linear interpolation.
補間 is a homophone meaning mathematical/computational interpolation between known values, whereas 補完 means to complete something by filling in a missing part.
Compound of 補 (supplement, compensate) and 間 (interval, space). The term is a modern technical coinage for the concept of interpolation.