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MT9M034 Datasheet(PDF) 14 Page - ON Semiconductor |
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MT9M034 Datasheet(HTML) 14 Page - ON Semiconductor |
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14 / 39 page  MT9M034 www.onsemi.com 14 Table 7. KNEE POINTS FOR COMPRESSION TO 14 BITS T1/T2 Exposure Ratio (R1) R0x3082[3:2] P1 POUT1 = P1 P2 POUT2 = (P2 − P1) / R1 + POUT1 T2/T3 Exposure Ratio (R2) R0x3082[5:4] PMAX POUTMAX = (PMAX − P2) / (R1 y R2) + POUT2 4x 212 4096 214 7168 4x 216 10240 8x 217 10752 16x 218 11008 8x 212 4096 215 7680 4x 217 10752 8x 218 11264 16x 219 11520 16x 212 4096 216 7936 4x 218 11008 8x 219 11520 16x 220 11776 Table 8. KNEE POINTS FOR COMPRESSION TO 12 BITS T1/T2 Exposure Ratio (R1) R0x3082[3:2] P1 POUT1 = P1 P2 POUT2 = (P2 − P1) / R1 + POUT1 T2/T3 Exposure Ratio (R2) R0x3082[5:4] PMAX POUTMAX = (PMAX − P2) / (R1 y R2) + POUT2 4x 211 2048 214 2944 8x 217 3840 16x 218 3904 8x 211 2048 215 3008 4x 217 3776 8x 218 3904 16x 219 3968 16x 211 2048 216 3040 4x 218 3808 8x 219 3936 16x 220 4000 HDR Specific Exposure Settings In HDR mode, pixel values are stored in line buffers while waiting for all 3 exposures to be available for final pixel data combination. There are 42 line buffers used to store intermediate T1 data. Due to this limitation, the maximum coarse integration time possible is equal to 42 × T1 / T2 lines. For example, if R0x3082[3:2] = 2, the sensor is set to have T1/T2 ratio = 16x. Therefore the maximum number of integration lines is 42 × 16 = 672 lines. If coarse integration time is greater than this, the T2 integration time will stay at 42. The sensor will calculate the ratio internally,enabling the linearization to be performed. If companding is being than relinearization would still follow the programmed ratio. For example if the T1 / T2 ratio was programmed to 16x but coarse integration was increased beyond 672 than one would still use the 16x relinearization formulas. An additional limitation is the maximum number of exposure lines in relation to the frame_length_lines register. In Linear mode, maximum coarse_integration_time = frame_length_lines − 1. However in HDR mode, since the coarse integration time register controls T1, the max coarse_integration time is frame_length_lines − 45. Putting the two criteria listed above together, it can be summarized as follows: maximum coarse_integration_time + minimum(42 T1 T2, frame_length_lines * 45) (eq. 3) In HDR mode, subline integration is not utilized. As such, fine integration time register changes will have no effect on the image. There is also a limitation of the minimum number of exposure lines that can be used. This is summarized in the following formula: minimumcoarse_integration_time + (0.5) (T1 T2) (T2 T3) (eq. 4) |
Similar Part No. - MT9M034_17 |
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Similar Description - MT9M034_17 |
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