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MT9V032 Folha de dados(PDF) 37 Page - ON Semiconductor |
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MT9V032 Folha de dados(HTML) 37 Page - ON Semiconductor |
37 / 61 page MT9V032 www.onsemi.com 37 PIXEL INTEGRATION CONTROL Total Integration R0x0B Total Shutter Width (In Terms of Number of Rows) This register (along with the window width and horizontal blanking registers) controls the integration time for the pixels. The actual total integration time, tINT, is: tINT + (Number of rows of integration x row time) ) overhead (eq. 1) where: • The number of rows integration is equal to the result of automatic exposure control (AEC) which may vary from frame to frame, or, if AEC is disabled, the value in R0x0B • Row time = (R0x04 + R0x05) master clock periods • Overhead = (R0x04 + R0x05 – 255) master clock periods Typically, the value of R0x0B (total shutter width) is limited to the number of rows per frame (which includes vertical blanking rows), such that the frame rate is not affected by the integration time. If R0x0B is increased beyond the total number of rows per frame, it is required to add additional blanking rows using R0x06 as needed. A second constraint is that tINT must be adjusted to avoid banding in the image from light flicker. Under 60Hz flicker, this means frame time must be a multiple of 1/120 of a second. Under 50Hz flicker, frame time must be a multiple of 1/100 of a second. Changes to Integration Time With automatic exposure control disabled (R0xAF, bit 0 is cleared to LOW), and if the total integration time (R0x0B) is changed through the two−wire serial interface while FRAME_VALID is asserted for frame n, the first frame output using the new integration time is frame (n + 2). Similarly, when automatic exposure control is enabled, any change to the integration time for frame n first appears in frame (n + 2) output. The sequence is as follows: 1. During frame n, the new integration time is held in the R0x0B live register. 2. At the start of frame (n + 1), the new integration time is transferred to the exposure control module. Integration for each row of frame (n + 1) has been completed using the old integration time. The earliest time that a row can start integrating using the new integration time is immediately after that row has been read for frame (n + 1). The actual time that rows start integrating using the new integration time is dependent on the new value of the integration time. 3. When frame (n + 1) is read out, it is integrated using the new integration time. If the integration time is changed (R0x0B written) on successive frames, each value written is applied to a single frame; the latency between writing a value and it affecting the frame readout remains at two frames. However, when automatic exposure control is disabled, if the integration time is changed through the two−wire serial interface after the falling edge of FRAME_VALID for frame n, the first frame output using the new integration time becomes frame (n+3). FRAME_VALID LED_OUT New Integration Programmed Actual Integration Image Data Frame Start Figure 20. Latency When Changing Integration Int = 200 rows Int = 300 rows Int = 200 rows Int = 300 rows Output Image with Int = 200 rows Output Image with Int = 300 rows |
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Descrição semelhante - MT9V032_17 |
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