AS ISO 20954.1:2019 pdf download – Digital cameras – Measurement for image stabilization performance

02-26-2022 comment

AS ISO 20954.1:2019 pdf download – Digital cameras – Measurement for image stabilization performance
3.5 handheld blur threshold
level of handheld blur at which image stabilization performance is determined
Note 1 to entry: In this document, this level is 63 μm of motion in the focal plane on one frame of 35 mm film,where one frame means the picture size (24 mm × 36 mm).
3.6 average vibration angle
expected deflection angle of camera rotation under handheld vibration during exposure
Note 1 to entry: The handheld vibration is given as the vibration waveform data that is specified in document.
Note 2 to entry: The average vibration angles are given as amount of angle in degrees of each exposure time as shown in Figure 7. The values are statistical expectation and are calculated from average of oscillation amplitude from peak to bottom of the vibration waveform when certain exposure time is applied.
3.7 35 mm film equivalent focal length
focal length of a lens attached to a camera with a sensor size of 24 mm × 36 mm (originated from 35 mm film) that produces the same field of view as the camera system with a lens at a given focal length for which the 35 mm sensor equivalent focal length is specified
4.1  General
The objective of this document is to specify how to measure optical image stabilization performance of a camera held in the user’s hands. Accordingly, a measurement session would better simulate a real shooting situation if the camera was actually held by a test photographer. However, this makes it difficult to eliminate variation among individual photographers or how well the camera is designed for handheld shooting. In order to cancel these effects, the test camera shall be mounted on a vibration generator that shakes the camera with a simulated handheld vibration waveform, and image stabilization performance shall be measured with images of a test chart specified by this document. This document specifies two waveforms that simulate the important characteristics of how a camera shakes when it is held by hand. These waveforms were developed by analysing extensive measurement data and adding further theoretical observations. Figure 1 shows an overview of the measurement method. Annex E collaterally gives additional explanations for background of specifying measurement method, vibration generator, vibration waveform and reference information.  General
For the measurements in this document, a CIPA-certified vibration generator should be used. If a non- certified vibration generator is used, it shall satisfy the amplitude and phase characteristics under the excitation conditions specified in  Excitation conditions
This subclause describes the required specifications for the amplitude and phase characteristics of the vibrations generated by the vibration generator excited with sine waves. Table 1 shows the properties of the sine waves that shall be used to measure the amplitude and phase characteristics. Table 2 and 3 respectively show the input sine wave combinations that shall be used to measure the vibration amplitude characteristics and phase characteristics. To measure the amplitude and phase characteristics, the vibration generator shall be excited in both yaw and pitch directions simultaneously, carrying a load weighing at least as much as the test objects, i.e. camera, storage media, battery and lens. Figure 2 is an overview of how to verify the vibration generator using these waveforms.

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