データシートサーチシステム |
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PYTHON480 データシート(PDF) 30 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 30 Page - ON Semiconductor |
30 / 69 page PYTHON 480 www.onsemi.com 30 Figure 27 illustrates a practical example of a configuration with four windows. The current position of the read pointer (ys) is indicated by a red line crossing the image array. For this position of the read pointer, three windows need to be read out. The initial start position for the x−kernel pointer is the x−start configuration of ROI0. Kernels are scanned up to the ROI2 x−end position. From there, the x−pointer jumps to the next window, which is ROI3 in this illustration. When reaching ROI3’s x−end position, the read pointer is incremented to the next line and xs is reinitialized to the starting position of ROI0. Notes: • The starting point for the readout pointer at the start of a frame is the y−start position of the first active window. • The read pointer is not necessarily incremented by one, but depending on the configuration, it can jump in y−direction. In Figure 27, this is the case when reaching the end of ROI0 where the read pointer jumps to the y−start position of ROI1 • The x−pointer starting position is equal to the x−start configuration of the first active window on the current line addressed. This window is not necessarily window #0. • The x−pointer is not necessarily incremented by one each cycle. At the end of a window it can jump to the start of the next window. • Each window can be activated separately. There is no restriction on which window and how many of the 4 windows are active. Figure 27. Scanning the Image Array with Four Windows ROI 0 ROI 3 ys ROI 2 ROI 1 Subsampling Subsampling is used to reduce the image resolution. This allows increasing the frame rate. Two subsampling modes are supported: for monochrome sensors (LVDS/CMOS) and color sensors (LVDS/CMOS). Monochrome Sensors For monochrome sensors, the read−1−skip−1 subsampling scheme is used. Subsampling occurs both in x− and y− direction. Color Sensors For color sensors, the read−2−skip−2 subsampling scheme is used. Subsampling occurs both in x− and y− direction. Figure 28 shows which pixels are read and which ones are skipped. Figure 28. Subsampling Scheme for Monochrome and Color Sensors Reverse Readout Reverse readout in y−direction can be done by toggling reverse_y (reg 194[8]). The reference for y_start and y_end pointers is reversed. Reverse readout in x−direction can be done by toggling reverse_x (reg 194[9]). |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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