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PYTHON480 データシート(PDF) 25 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 25 Page - ON Semiconductor |
25 / 69 page PYTHON 480 www.onsemi.com 25 Table 18. CONFIGURABLE PARAMETERS FOR BLACK LEVEL ALGORITHM Group Addresses Description Black Line Generation 197[7:0] black_lines This register configures the number of black lines that are generated at the start of a frame. At least one black line must be generated. The maximum number is 255. Note: When the automatic black−level calibration algorithm is enabled, make sure that this register is configured properly to produce sufficient black pixels for the black−level filtering. The number of black pixels generated per line is dependent on the operation mode and window configurations: Each black line contains 404 kernels. 197[12:8] gate_first_line A number of black lines are blanked out when a value different from 0 is configured. These blanked out lines are not used for black calibration. It is recommended to enable this func- tionality, because the first line can have a different behavior caused by boundary effects. Black Value Filtering 129[0] auto_blackcal_enable Internal black−level calibration functionality is enabled when set to ‘1’. Required black level offset compensation is calculated on the black samples and applied to all image pixels. When set to ‘0’, the automatic black−level calibration functionality is disabled. It is possible to apply an offset compensation to the image pixels, which is defined by the registers 129[10:1]. Note: Black sample pixels are not compensated; the raw data is sent out to provide external statistics and, optionally, calibrations. 129[9:1] blackcal_offset Black calibration offset that is added or subtracted to each regular pixel value when au- to_blackcal_enable is set to ‘0’. The sign of the offset is determined by register 129[10] (blackcal_offset_dec). Note: All channels use the same offset compensation when automatic black calibration is disabled. The calculated black calibration factors are frozen when this register is set to 0x1FF (all−‘1’) in auto calibration mode. Any value different from 0x1FF re−enables the black calibration algorithm. This freezing option can be used to prevent eventual frame to frame jitter on the black level as the correction factors are recalculated every frame. It is recommended to enable the black calibration regularly to compensate for temperature changes. 129[10] blackcal_offset_dec Sign of blackcal_offset. If set to ‘0’, the black calibration offset is added to each pixel. If set to ‘1’, the black calibration offset is subtracted from each pixel. This register is not used when auto_blackcal_enable is set to ‘1’. 128[10:8] black_samples The black samples are low−pass filtered before being used for black level calculation. The more samples are taken into account, the more accurate the calibration, but more samples require more black lines, which in turn affects the frame rate. The effective number of samples taken into account for filtering is 2^black_samples. Note: An error is reported by the device if more samples than available are requested (refer to register 136). Black Level Filtering Monitoring 136 blackcal_error0 An error is reported by the device if there are requests for more samples than are available (each bit corresponding to one data path). The black level is not compensated correctly if one of the channels indicates an error. There are three possible methods to overcome this situation and to perform a correct offset compensation: • Increase the number of black lines such that enough samples are generated at the cost of increasing frame time (refer to register 197). • Relax the black calibration filtering at the cost of less accurate black level determina- tion (refer to register 128). • Disable automatic black level calibration and provide the offset via SPI register upload. Note that the black level can drift in function of the temperature. It is thus recommended to perform the offset calibration periodically to avoid this drift. NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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