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MT9V024 Arkusz danych(PDF) 23 Page - ON Semiconductor |
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MT9V024 Arkusz danych(HTML) 23 Page - ON Semiconductor |
23 / 40 page MT9V024/D www.onsemi.com 23 5 LSB of the result. The 10−bit result is subtracted from each pixel value on the row in turn. In addition, a positive constant will be added (Reg0x71, bits 7:0). This constant should be set to the dark level targeted by the black level algorithm plus the noise expected on the measurements of the averaged values from dark columns; it is meant to prevent clipping from negative noise fluctuations. Pixel value + ADC value * dark column average ) R0x71[9 : 0] (eq. 20) Note that this algorithm does not work in color sensor. Automatic Gain Control and Automatic Exposure Control The integrated AEC/AGC unit is responsible for ensuring that optimal auto settings of exposure and (analog) gain are computed and updated every frame. AEC and AGC can be individually enabled or disabled by R0xAF. When AEC is disabled (R0xAF[0] = 0), the sensor uses the manual exposure value in coarse and fine shutter width registers. When AGC is disabled (R0xAF[1] = 0), the sensor uses the manual gain value in R0x35 or R0x36. See “Pixel Integration Control” for more information. MAX. EXPOSURE (R6xBD) DESIRED BIN (desired luminance) (R0xA5) MAX. GAIN (R0x36) EXP. LPF (R6xA8) EXP. SKIP (R0xA6) MANUAL EXP. (R0x08) AEC ENABLE (R0Xaf[0]) To exposure timing control To analog gain control R0xBA AEC OUTPUT R0xBB AGC OUTPUT MIN GAIN MIN EXP GAIN LPF (R0xAB) GAIN SKIP (R0xA9) MANUAL GAIN (R0x35) AGC ENABLE (R0xAF[1]) AEC UNIT HISTOGRAM GENERATOR UNIT AGC UNIT 1 16 Figure 29. Controllable and Observable AEC/AGC Registers 0 1 1 0 The exposure is measured in row−time by reading R0xBB. The exposure range is 1 to 2047. The gain is measured in gain−units by reading R0xBA. The gain range is 16 to 63 (unity gain = 16 gain−units; multiply by 1/16 to get the true gain). When AEC is enabled (R0xAF), the maximum auto exposure value is limited by R0xBD; minimum auto exposure is limited by AEC Minimum Exposure, R0xAC. NOTE: AEC does not support sub−row timing; calculated exposure values are rounded down to the nearest row−time. For smoother response, manual control is recommended for short exposure times. When AGC is enabled (R0xAF), the maximum auto gain value is limited by R0xAB; minimum auto gain is fixed to 16 gain−units. The exposure control measures current scene luminosity and desired output luminosity by accumulating a histogram of pixel values while reading out a frame. All pixels are used, whether in color or mono mode. The desired exposure and gain are then calculated from this for subsequent frame. When binning is enabled, tuning of the AEC may be required. The histogram pixel count register, R0xB0, may be adjusted to reflect reduced pixel count. Desired bin register, R0xA5, may be adjusted as required. Pixel Clock Speed The pixel clock speed is same as the master clock (SYSCLK) at 26.66 MHz by default. However, when column binning 2 or 4 (R0x0D or R0x0E, bit 2 or 3) is enabled, the pixel clock speed is reduced by half and one−fourth of the master clock speed respectively. See “Read Mode Options” and “Column Binning” for additional information. Hard Reset of Logic The RC circuit for the MT9V024 uses a 10 k W resistor and a 0.1 mF capacitor. The rise time for the RC circuit is 1 ms maximum. Soft Reset of Logic Soft reset of logic is controlled by: • R0x0C Reset |
Podobny numer części - MT9V024_17 |
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Podobny opis - MT9V024_17 |
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