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The SSIM index is a full reference metric; in other words, the measurement or prediction of image quality is based on an initial uncompressed or distortion-free image as reference. SSIM is a perception -based model that considers image degradation as perceived change in structural information, while also incorporating important perceptual ...
The first was to locate SIMS items listing medical symptoms reported rarely by the honest group but frequently by the exaggerating group: "The rare symptoms (RS) scale was created by identifying SIMS items endorsed by less than 10% of genuine responders but more than 25% of feigners." The SIMS RS scale developed by Rogers contains 15 SIMS items.
SIMS requires a high vacuum with pressures below 10 −4 Pa (roughly 10 −6 mbar or torr). This is needed to ensure that secondary ions do not collide with background gases on their way to the detector (i.e. the mean free path of gas molecules within the detector must be large compared to the size of the instrument), and it also limits surface ...