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AR0141CS датащи(PDF) 35 Page - ON Semiconductor |
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AR0141CS датащи(HTML) 35 Page - ON Semiconductor |
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35 / 64 page ![]() AR0141CS/D Rev. 6, 4/16 EN 35 ©Semiconductor Components Industries, LLC, 2016. AR0141CS: 1/4-Inch Digital Image Sensor Changing Sensor Modes Figure 31: Example of Changing the Sensor from Context A to Context B Compression The AR0141CS can optionally compress 12-bit data to 10-bit using A-law compression. The compression is applied after the data pedestal has been added to the data. See “Data Pedestals” on page 19. The A-law compression is disabled by default and can be enabled by setting R0x31D0 from “0” to “1” and 0x31AC needs to be set to 0x0C0A. Table 16: A-Law Compression Table for 12-10 bits Input Range Input Values Compressed Codeword 11 10 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 0 to 127 0 0 0 0 0 a b c d e f g 0 0 0 a b c d e f g 128 to 255 0 0 0 0 1 a b c d e f g 0 0 1 a b c d e f g 256 to 511 0 0 0 1 a b c d e f g X 0 1 0 a b c d e f g 512 to 1023 0 0 1 a b c d e f g X X 0 1 1 a b c d e f g 1024 to 2047 0 1 a b c d e f g h X X 1 0 a b c d e f g h 2048 to 4095 1 a b c d e f g h X X X 1 1 a b c d e f g h Active Rows V ertical B lanking Tim e 1/6 0s 1/6 0s Start of Vertic al Blankin g Start of Fram e S ta rt o f A c tiv e R o w End of Fram e Serial SYNC Codes End of Fram e Readout End of Fram e Readout End of Fram e Readout 1/3 0s 1280 x 720 F ram e N+1 1 280 x 720 Fra m e N H B (370 P ixels/C olum n) H B (370 P ixels/C olum n) 1280 x 720 F ram e N+2 H B (370 P ixels/C olum n) Write context A to B during readout of Frame N Integration time of context B mode implemented during readout of frame N+1 Context B mode is implemented in frame N+2 |
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