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MT9M114 数据表(PDF) 26 Page - ON Semiconductor |
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MT9M114 数据表(HTML) 26 Page - ON Semiconductor |
26 / 45 page MT9M114 www.onsemi.com 26 Cam_scale_vertical_tc_percentage defines how much tilt needs to be corrected for in percentage terms. The effect of using cam_scale_vertical_tc_mode can be seen below. Figure 27. The Effect of Using CAM_SCALE_VERTICAL_TC_MODE Original Scene Tilted MODE_STRETCH_FROM_CENTRE_EN = 0 MODE_STRETCH_FROM_CENTRE_EN = 1 CAMERA CONTROL AND AUTO FUNCTIONS Auto Exposure The auto exposure algorithm performs automatic adjustments of the image brightness by controlling exposure time and analog gains of the sensor core as well as digital gains applied to the image. Auto exposure is implemented by a firmware driver that analyzes image statistics collected by the exposure measurement engine, makes a decision, and programs the sensor core and color pipeline to achieve the desired exposure. The measurement engine subdivides the image into 25 windows organized as a 5 × 5 grid. Four auto exposure algorithm modes are available: • Average brightness tracking (ABT) or Average Y (ae_rule_algo VAR = 9, 0x0004, 0x0000 or REG = 0xA404, 0x0000) The average brightness tracking AE uses a constant average tracking algorithm where a target brightness value is compared to a current brightness value, and the gain and integration time are adjusted accordingly to meet the target requirement. • Weighted Average Brightness (ae_rule_algo VAR = 9, 0x0004, 0x0001 or REG = 0xA404, 0x0001) Each of the 25 windows can be assigned a weight relative to other window weights, which can be changed independently of each other. For example, the weights can be set to allow the center of the image to be weighted higher than the periphery. See Figure 28. Figure 28. 5 y 5 Grid W 0,0 W 0,1 W 0,2 W 0,3 W 0,4 W 1,0 W 1,1 W 1,2 W 1,3 W 1,4 W 2,0 W 2,1 W 2,2 W 2,3 W 2,4 W 3,0 W 3,1 W 3,2 W 3,3 W 3,4 W 4,0 W 4,1 W 4,2 W 4,3 W 4,4 |
类似零件编号 - MT9M114_1 |
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类似说明 - MT9M114_1 |
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