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MT9P031 Arkusz danych(PDF) 22 Page - ON Semiconductor |
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MT9P031 Arkusz danych(HTML) 22 Page - ON Semiconductor |
22 / 32 page MT9P031 www.onsemi.com 22 offset of between –2048 and 2047 is added. The resulting 12-bit pixel value is then output on the DOUT[11:0] ports. The analog offset applied is determined automatically by the black level calibration algorithm, which attempts to shift the output of the analog signal chain so that black is at a particular level. The digital offset is a fine-tuning of the analog offset. Figure 25. Signal path Pixel Voltage Digital Gain Analog Gain Digital Datapath X + Analog Signal Chain X + Digital Offset Correction Black Level Calibration DOUT[11:0] ADC Analog Offset Gain There are two types of gain supported: analog gain and digital gain. Combined, gains of between 1 and 128 are possible. The recommended gain settings are shown in Table 15. Table 15. GAIN INCREMENT SETTINGS Gain Range Increments Digital Gain Analog Multipier Analog Gain 1– 4 0.125 0 0 8–32 4.25–8 0.25 0 1 17–32 9–128 1 1–120 1 32 1. Analog gain should be maximized before applying digital gain. 2. The recommended minimum gain is 1.38 (0x000B) 3. For optimal sensor performance, when using gain settings <= 4.0, also set reserved register R0x3E = 0x0080 and for gain settings >4.0, set register R0x003E=0x00C0. The combined gain for a color C is given by: GC = AGC x DGC. Analog Gain The analog gain is specified independently for each color channel. There are two components, the gain and the multiplier. The gain is specified by Green1_Analog_Gain, Red_Analog_Gain, Blue_Analog_Gain, and Green2_Analog_Gain in steps of 0.125. The analog multiplier is specified by Green1_Analog_Multiplier, Red_Analog_Multiplier, Blue_Analog_Multiplier, and Green2_Analog_Multiplier. These combine to form the analog gain for a given color C as shown in this equation: AGC = (1 + C_Analog_Multiplier) × (C_Analog_Gain / 8) The gain component can range from 0 to 7.875 in steps of 0.125, and the multiplier component can be either 0 or 1 (resulting in a multiplier of 1 or 2). However, it is best to keep the “gain” component between 1 and 4 for the best noise performance, and use the multiplier for gains between 4 and 8. Digital Gain The digital gain is specified independently for each color channel in steps of 0.125. It is controlled by the register fields Green1_Digital_Gain, Red_Digital_Gain, Blue_Digital_Gain, and Green2_Digital_Gain. The digital gain for a color C is given by: DGC = 1 + (C_Digital_Gain / 8) Offset The MT9P031 sensor can apply an offset or shift to the image data in a number of ways. An analog offset can be applied on a color-wise basis to the pixel voltage as it enters the ADC. This makes it possible to adjust for offset introduced in the pixel sampling and gain stages to be removed, centering the resulting voltage swing in the ADC’s range. This offset can be automatically determined by the sensor using the automatic black level calibration (BLC) circuit, or it can be set manually by the user. It is a fairly coarse adjustment, with adjustment step sizes of 4 to 8 LSBs. |
Podobny numer części - MT9P031_17 |
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Podobny opis - MT9P031_17 |
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