ISO 15781:2015 pdf free

ISO 15781:2015 pdf free.Photography一Digital still cameras一Measuring shooting time lag, shutter release time lag, shooting rate,and start-up time
Timing measurements shall be performed under daylight conditions or a tungsten lamp. Procedures for determining whether the illumination used for OECF measurements is an acceptable match to the daylight illuminant shall be conducted in accordance with ISO 7589.
This International Standard defines two measurement methods. The first method is the “external measurement”method which can be performed without disassembling the digital camera. The second method is the “internal measurement” method which requires the camera body to be partially disassembled in order to perform measurements using electrical signals inside the camera body. The first method is the preferred method for measurements made by users of digital cameras. The second method is the preferred method for measurements made by digital camera manufacturers.
NOTE 1 Figure 3, Figure 4, and Figure 5 show the periods of time to be measured.
NOTE 2 “Procedure related to the pre-capture point” means the procedure by which the digital still camera measures the light intensity and distance, determines the exposure, and adjusts the focus when the pre-capture point switch of the digital still camera is pressed.
NOTE 3 “Procedure related to the capture point” means the procedure by which the digital still camera processes the image captures and preparation of the image storage when the capture point switch of the camera is pressed.
The external method of measurement is performed without disassembling the camera with the advantage that the measurement can be performed on the product level. Specifically, for instance,the measurement can be performed shooting a timing device that can determine a time interval from captured images. An example of this method is shown in Annex B.
When using the external measurement, the acceptable level of the time lag between pressing the exposure button and activating the timing device is application dependent and needs to be considered prior to performing a test and the estimated error caused by this time lag shall be reported together with the results (see Annex B). A test was performed using different approaches and the results are shown in Annex A.ISO 15781 pdf free.