android camera系统3A模式及其状态转换(二)
2015-12-21 11:09
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5. AF state machines
6. AE and AWB state machines
AE和AWB的状态机基本上是完全相同的。AE有额外的FLASH_REQUIRED和PRECAPTURE状态。所以下面行中涉及这两个状态时,AWB状态机忽略之。
7. Enabling manual control
在配置3A模块中所涉及的一些控制,允许application直接控制。
对于每个请求,HAL层负责3A控制的模块会检查3A控制字段的状态。如果有3A事例使能,这些事例可能会重置该事例相关的控制变量,重置的值会放置于此次捕获的结果元数据中。例如,如果在一个请求中自动曝光使能,HAL层会重置这个请求中的曝光值,增益和帧周期字段(和潜在的闪光灯字段,依赖于AE模式)。相关控制如下:
(全文完)
https://source.android.com/devices/camera/camera3_3Amodes.html#af-state
mode = AF_MODE_OFF or AF_MODE_EDOF | |||
State | Transformation cause | New state | Notes |
---|---|---|---|
INACTIVE | AF is disabled | ||
mode = AF_MODE_AUTO or AF_MODE_MACRO | |||
State | Transformation cause | New state | Notes |
INACTIVE | AF_TRIGGER | ACTIVE_SCAN | Start AF sweep Lens now moving |
ACTIVE_SCAN | AF sweep done | FOCUSED_LOCKED | If AF successful Lens now locked |
ACTIVE_SCAN | AF sweep done | NOT_FOCUSED_LOCKED | If AF successful Lens now locked |
ACTIVE_SCAN | AF_CANCEL | INACTIVE | Cancel/reset AF Lens now locked |
FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Cancel/reset AF |
FOCUSED_LOCKED | AF_TRIGGER | ACTIVE_SCAN | Start new sweep Lens now moving |
NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Cancel/reset AF |
NOT_FOCUSED_LOCKED | AF_TRIGGER | ACTIVE_SCAN | Start new sweep Lens now moving |
All states | mode change | INACTIVE | |
mode = AF_MODE_CONTINUOUS_VIDEO | |||
State | Transformation cause | New state | Notes |
INACTIVE | HAL initiates new scan | PASSIVE_SCAN | Start AF sweep Lens now moving |
INACTIVE | AF_TRIGGER | NOT_FOCUSED_LOCKED | AF state query Lens now locked |
PASSIVE_SCAN | HAL completes current scan | PASSIVE_FOCUSED | End AF scan Lens now locked |
PASSIVE_SCAN | AF_TRIGGER | FOCUSED_LOCKED | Immediate transformation if focus is good Lens now locked |
PASSIVE_SCAN | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate transformation if focus is bad Lens now locked |
PASSIVE_SCAN | AF_CANCEL | INACTIVE | Reset lens position Lens now locked |
PASSIVE_FOCUSED | HAL initiates new scan | PASSIVE_SCAN | Start AF scan Lens now moving |
PASSIVE_FOCUSED | AF_TRIGGER | FOCUSED_LOCKED | Immediate transformation if focus is good Lens now locked |
PASSIVE_FOCUSED | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate transformation if focus is bad Lens now locked |
FOCUSED_LOCKED | AF_TRIGGER | FOCUSED_LOCKED | No effect |
FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
NOT_FOCUSED_LOCKED | AF_TRIGGER | NOT_FOCUSED_LOCKED | No effect |
NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
mode = AF_MODE_CONTINUOUS_PICTURE | |||
State | Transformation cause | New state | Notes |
INACTIVE | HAL initiates new scan | PASSIVE_SCAN | Start AF scan Lens now moving |
INACTIVE | AF_TRIGGER | NOT_FOCUSED_LOCKED | AF state query Lens now locked |
PASSIVE_SCAN | HAL completes current scan | PASSIVE_FOCUSED | End AF scan Lens now locked |
PASSIVE_SCAN | AF_TRIGGER | FOCUSED_LOCKED | Eventual transformation once focus good Lens now locked |
PASSIVE_SCAN | AF_TRIGGER | NOT_FOCUSED_LOCKED | Eventual transformation if cannot focus Lens now locked |
PASSIVE_SCAN | AF_CANCEL | INACTIVE | Reset lens position Lens now locked |
PASSIVE_FOCUSED | HAL initiates new scan | PASSIVE_SCAN | Start AF scan Lens now moving |
PASSIVE_FOCUSED | AF_TRIGGER | FOCUSED_LOCKED | Immediate transformation if focus is good Lens now locked |
PASSIVE_FOCUSED | AF_TRIGGER | NOT_FOCUSED_LOCKED | Immediate transformation if focus is bad Lens now locked |
FOCUSED_LOCKED | AF_TRIGGER | FOCUSED_LOCKED | No effect |
FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
NOT_FOCUSED_LOCKED | AF_TRIGGER | NOT_FOCUSED_LOCKED | No effect |
NOT_FOCUSED_LOCKED | AF_CANCEL | INACTIVE | Restart AF scan |
AE和AWB的状态机基本上是完全相同的。AE有额外的FLASH_REQUIRED和PRECAPTURE状态。所以下面行中涉及这两个状态时,AWB状态机忽略之。
mode = AE_MODE_OFF / AWB mode not AUTO | |||
State | Transformation cause | New state | Notes |
---|---|---|---|
INACTIVE | AE/AWB disabled | ||
mode = AE_MODE_ON_* / AWB_MODE_AUTO | |||
State | Transformation cause | New state | Notes |
INACTIVE | HAL initiates AE/AWB scan | SEARCHING | |
INACTIVE | AE/AWB_LOCK on | LOCKED | Values locked |
SEARCHING | HAL finishes AE/AWB scan | CONVERGED | Good values, not changing |
SEARCHING | HAL finishes AE scan | FLASH_REQUIRED | Converged but too dark without flash |
SEARCHING | AE/AWB_LOCK on | LOCKED | Values locked |
CONVERGED | HAL initiates AE/AWB scan | SEARCHING | Values locked |
CONVERGED | AE/AWB_LOCK on | LOCKED | Values locked |
FLASH_REQUIRED | HAL initiates AE/AWB scan | SEARCHING | Values locked |
FLASH_REQUIRED | AE/AWB_LOCK on | LOCKED | Values locked |
LOCKED | AE/AWB_LOCK off | SEARCHING | Values not good after unlock |
LOCKED | AE/AWB_LOCK off | CONVERGED | Values good after unlock |
LOCKED | AE_LOCK off | FLASH_REQUIRED | Exposure good, but too dark |
All AE states | PRECAPTURE_START | PRECAPTURE | Start precapture sequence |
PRECAPTURE | Sequence done, AE_LOCK off | CONVERGED | Ready for high-quality capture |
PRECAPTURE | Sequence done, AE_LOCK on | LOCKED | Ready for high-quality capture |
在配置3A模块中所涉及的一些控制,允许application直接控制。
对于每个请求,HAL层负责3A控制的模块会检查3A控制字段的状态。如果有3A事例使能,这些事例可能会重置该事例相关的控制变量,重置的值会放置于此次捕获的结果元数据中。例如,如果在一个请求中自动曝光使能,HAL层会重置这个请求中的曝光值,增益和帧周期字段(和潜在的闪光灯字段,依赖于AE模式)。相关控制如下:
Control name | Unit | Notes |
---|---|---|
android.control.mode | enum: OFF, AUTO, USE_SCENE_MODE | High-level 3A control. When set to OFF, all 3A control by the HAL is disabled. The application must set the fields for capture parameters itself. When set to AUTO, the individual algorithm controls in android.control.* are in effect, such as android.control.afMode. When set to USE_SCENE_MODE, the individual controls in android.control.* are mostly disabled, and the HAL implements one of the scene mode settings (such as ACTION, SUNSET, or PARTY) as it wishes. |
android.control.afMode | enum | OFF means manual control of lens focusing through android.lens.focusDistance. |
android.control.aeMode | enum | OFF means manual control of exposure/gain/frame duration through android.sensor.exposureTime / .sensitivity / .frameDuration |
android.control.awbMode | enum | OFF means manual control of white balance. |
https://source.android.com/devices/camera/camera3_3Amodes.html#af-state
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