AE – Bright
The bright control function adjusts both the gain and iris using an internal algorithm according to a brightness level freely set by the user. Exposure is controlled by gain when dark and by iris when bright. As both gain and iris are fixed, this mode is used when exposing at a fixed camera sensitivity. When switching from Full Auto or Shutter Priority Mode to Bright Mode, the current status will be retained for a short period of time.
Only when the AE mode is set to “Full Auto” or “Shutter Priority,” the user can switch it to “Bright.”
Gain
IRIS AGC
OPEN MAX
IRIS curve
Gain curve
CLOSE MIN
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Controlled | Controlled by IRIS | |||
by gain |
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Bright limit which controllable for this unit
Data | Iris | Gain | Data | Iris | Gain |
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1F | F1.4 | 28 dB | 0F | F2.0 | 0 dB |
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1E | F1.4 | 26 dB | 0E | F2.4 | 0 dB |
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1D | F1.4 | 24 dB | 0D | F2.8 | 0 dB |
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1C | F1.4 | 22 dB | 0C | F3.4 | 0 dB |
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1B | F1.4 | 20 dB | 0B | F4.0 | 0 dB |
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1A | F1.4 | 18 dB | 0A | F4.8 | 0 dB |
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19 | F1.4 | 16 dB | 09 | F5.6 | 0 dB |
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18 | F1.4 | 14 dB | 08 | F6.8 | 0 dB |
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17 | F1.4 | 12 dB | 07 | F8.0 | 0 dB |
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16 | F1.4 | 10 dB | 06 | F9.6 | 0 dB |
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15 | F1.4 | 8 dB | 05 | F11 | 0 dB |
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14 | F1.4 | 6 dB | 04 | F14 | 0 dB |
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13 | F1.4 | 4 dB | 03 | F16 | 0 dB |
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12 | F1.4 | 2 dB | 02 | F19 | 0 dB |
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11 | F1.4 | 0 dB | 01 | F22 | 0 dB |
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10 | F1.6 | 0 dB | 00 | CLOSE | 0 dB |
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When switching from the Shutter Priority mode to the Bright mode, the shutter speed set in the Shutter Priority mode is maintained.
Basic Functions
Spot Exposure Mode
In Full Auto AE, the level for the entire screen is computed and the optimum Auto Iris and Gain levels are determined. In Spot AE, a particular section of the subject can be designated, and then that portion of the image can be weighted and a value computed so that Iris and Gain can be optimized to obtain an image. For example, in an image with a lot of movement and with varying levels of brightness, portions without much change can be designated as such a “spot,” and changes to the screen can be minimized in that area. As shown in the diagram below, a range of 16 blocks vertically and 16 blocks horizontally can be designated.
In the case where the center is designated (shown in black), the level is computed along with a weighted value for the surrounding block (shaded), including the specified portions; and then the Gain and Iris are set. The value of the designated portions and the surrounding areas should be calculated as 90% and the rest should be set to 10%. The range of the Spot AE frame is fixed to five blocks vertically and four blocks horizontally.
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| Horizontal 16 | |||||||||||
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0 |
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1 |
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2 |
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Vertical 16 43 |
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5 |
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6 |
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7 |
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8 |
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9 |
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A |
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B |
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C |
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D |
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E |
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F |
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9