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AF algo (spd_custom_af_control image (Contorl Flow (Accurate (BackTo…

- - - - Find Direction
        
        Low Light
        
        luma diff
        
        Not Low Light
        
        xf_fv1
        drop enough
        
        TH1
        xf_fv1 超過2% (當前frame fv1的2%)
        
        TH2
        xf_fv1 超過2%(當前frame fv1的2%)
        
        lin_y
        fv1 找不到方向時
      - Verify Direction
        
        繼續觀察xf_fv1 跟 lin_y 變化程度
        
        TH2
      - Into Accurate
        
        fv 最大值超過當前fv 很多
        
        Hit Boundary
        靠近邊界, 開始細找
        
        預走1/2位置
        
        預測的位置
        gAF.cur_focus_idx
    - - BackTo Coarse
        
        最大fv2 低於 coarse 時 , 最大值的70%
        
        ~~找到方向~~
        
        fv變化太小
        fv2,fv2 的特性 , 不在peak會差很多
        
        Not Find Dir
        
        Change ROI
        
        Global Search
        
        Find Dir
        
        Local Max
        
        還在平原區
        _gCtx.flat_retry++
        
        Global Search
        
        hit Near and Far BD
        
        zoom idx > 1300
        
        how ??
      - Verify
        
        Find Dir
        
        Fv 變化夠大
        
        Hit Far BD
      - Watch
        
        Hit Near and Far BD
        
        zoom idx < 1300
      - StandBY
        
        Find Dir & Drop not enough
        
        Hit Near BD
    - - To Coarse
        
        scene Change
        
        luma diff
    - - Watch
        
        fv2 沒有掉太多
        
        watch_thre = 100
        
        watch_thre_2 = 99
      - Accurate
        
        fv2大於 accu_thre 但少於watch_thre_2
        
        accu_thre=95
      - Coarse
        
        else
      - not -used , 利用zoom , gain norm 來決定threshold , 目前沒用到
    - - Coarse
        
        Fake Peak
        
        sec_chg_val
        
        fv2 fall over 15% and zoom idx > 100
      - Accurate
        
        sec_chg_val
        
        fv2 fall less then 15%
      - SceneChg
        
        vib_fv_eng
        很像variance , 發散程度?
      - compare watch fram
        
        vib_lum_dif
        
        vib_fv_eng