ARTRAY IMX265LQR-C Libretto di istruzioni - Pagina 9

Sfoglia online o scarica il pdf Libretto di istruzioni per Fotocamera digitale ARTRAY IMX265LQR-C. ARTRAY IMX265LQR-C 18. Usb3.0 cmos camera

6.3. Camera's functions

The exposure time (electronic shutter speed) of the camera can be set in 100μsec unit

(1 line time resolution).

The exposure time can be calculated by the following formula:

Exposure time = the setting value of the shutter speed * 100μsec (Setting Range: 1～30000)

The calculation formula for the 1 line time is different for every single mode.

When outputting all pixels (2048 x 1536)

1 line time = (2048 + 208) * 0.375 * 1/74.25 [μsec] = 846 * 1/74.25 [μsec] = 11.394[μsec]

Exposure time(min) = 1 * 100[μsec] = 100[μsec],

Exposure time(max) = 30000 * 100[μs] = 3000000[μsec],

When setting to ROI mode

1 line time = (Effective horizontal pixels + 208) * 0.375 * 1/74.25 [μsec]

※When ROI mode is performed, the settings of exposure time can be inherited, however, it may be

truncated according to sensor's upper/ lower limit values.

For instance, when changing from a full resolution state where exposure time is set to 3 seconds, to a

ROI mode of 640*480 resolutions,

1 line time = (640+208) * 0.375 * 1/74.25 = 4.283[μsec],

then, the upper limit of the exposure time = 4.283[μsec] * 32767[lines]=140[millisecond],

Thus, the exposure time is set to be 140 milliseconds.

※If the frame rate does not rise, there is a possibility that the exposure time is longer than 1 frame time,

despite to ROI mode.

In such a case, please set the exposure time to <1 frame time.

[100 / 11.394] * 11.394 = 91.152[μsec]

[3000000 / 11.394] * 11.394 [μsec] ≒ 3.0[sec]

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