PD ISO/TS 195672 specifies a measurement method for texture reproduction.
PD ISO/TS 195672 specifies a protocol to measure the texture reproduction in images captured and processed by digital cameras including cameras in other devices e.g., in camera phones. PD ISO/TS 195672 specifies protocols for the measurement of texture reproduction using test charts with stochastic patterns.
PD ISO/TS 19567-2 provides test conditions for measuring equipment, lighting, camera settings, apparatus, and hardware.
NOTE: The measurement method specified in PD ISO/TS 195672 is for objective evaluations of texture reproduction, of which the results are sometimes inconsistent with subjective evaluations.
PD ISO/TS 195672 on texture analysis using stochastic pattern is useful for:
Looking at the latest generation of noise reduction algorithms it becomes clear that these algorithms are capable of identifying oriented structures even at low contrast, including the low contrast cyclic patterns described in ISO/TS 195671. They apply a different noise reduction to these structures than to structures that have no identifiable orientation and therefore are closer to the characteristics of noise. This was the reason to create PD ISO/TS 195672 focusing on a stochastic pattern. PD ISO/TS 195672 specifies methods to measure texture reproduction using test charts with a stochastic pattern. The test charts described here are based on randomly arranged circles of various sizes and colour with limited contrast. This provides a target with known structure and spatial statistics similar to natural images
For digital still camera images, the texture is restricted to the visual surface quality, and the characteristic of texture reproduction in the captured image can be interpreted as the reproduction of the low contrast fine details. PD ISO/TS 195672 specifies the measurement of how cameras reproduce texture defined as low contrast fine details.
PD ISO/TS 195672 is for objective evaluations of texture reproduction for images, their relationship to subjective evaluations of texture reproduction with visual perception is important to give attention since image quality for camera/photograph users generally accords with subjective evaluation. Annex C of PD ISO/TS 195672 explains possible inconsistency between measurement results using the method described in PD ISO/TS 195672 and subjective evaluations, due to different conditions of noise, with experimental results for images.
ISO/TS 19567-2:2019