AS ISO 20954.1:2019 Digital cameras — Measurement for image stabilization performance
4.4.1  Brief description of the procedures
Two quantities, measured handheld blur amount and reference handheld blur amount, shall be compared to quantify optical image stabilization performance. To obtain these values, four additional quantities are used: intrinsic image degradation amount, total image degradation amount, reference image degradation amount, and theoretical handheld blur amount. These terms are used uniquely as variables in the calculation procedure in this document and explained hereinafter. Table 4 gives symbols and units of the values. Intrinsic image degradation amount is loss of image sharpness caused by factors unique to the camera, such as optical performance, effective number of pixels, and image processing. It does not include handheld blur. When measuring optical image stabilization performance, subtracting intrinsic image degradation amount excludes most of the effects of camera elements that are not part of the image stabilization function. See 4.5.1 a).
Total image degradation amount is the measured amount of loss of sharpness of an image taken by a test camera excited with a vibration waveform while the image stabilization function is enabled. See 4.5.1 d).
Reference image degradation amount is the expected amount of loss of sharpness in an image taken by a test camera excited with a vibration waveform while the image stabilization function is disabled. This value is the square root of the sum of the squares of intrinsic image degradation amount and theoretical handheld blur amount. See 4.5.1 c).
Theoretical handheld blur amount is the theoretically calculated amount of handheld blur that would be measured from an image taken by a test camera excited with a vibration waveform while the image stabilization function is disabled. See 4.5.1 b).
Measured handheld blur amount is the amount of handheld blur that remains uncompensated after enabling the image stabilization function of the camera. This value is calculated by subtracting intrinsic image degradation amount from the total image degradation amount. See 4.5.1 f).
Reference handheld blur amount is the baseline value against which to compare measured handheld blur amount to determine optical image stabilization performance. This value is calculated by subtracting intrinsic image degradation amount from reference image degradation amount, and represent the handheld blur with the image stabilization function disabled. See 4.5.1 e).