Examples of the disclosure relate to an apparatus, method and computer program for determining biometric parameters. The apparatus comprises means for: obtaining a signal from a broadband detector in response to light that has been propagated through a subject being incident on the broadband detector. The signal that is obtained comprises at least a first component and a second component. The first component is provided in response to a first spectral and spatial distribution of light being incident on the broadband detector and the second component is provided in response to at least one other spectral and spatial distribution of light being incident on the broadband detector. An emitter of the first spectral and spatial distribution of light and an emitter of the at least one other spectral and spatial distribution of light are controlled so that the first spectral and spatial distribution of light and the at least one other spectral and spatial distribution light have a similar dependency to motion artefacts but a different dependency to a biometric parameter. The apparatus also has means for processing the first component and the second component of the obtained signal to enable the biometric parameter of the subject to be determined.
