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PYTHON480 データシート(PDF) 29 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 29 Page - ON Semiconductor |
29 / 69 page PYTHON 480 www.onsemi.com 29 ADDITIONAL FEATURES Multiple Window Readout The PYTHON 480 image sensors support multiple window readout, which means that only the user−selected Regions Of Interest (ROI) are read out. This allows limiting data output for every frame, which in turn allows increasing the frame rate. Up to four ROIs can be configured. Window Configuration Figure 25 shows the four parameters defining a region of interest (ROI). Figure 25. Region of Interest Configuration y-start y-end x-start x-end ROI 0 • x−start[8:0] x−start defines the x−starting point of the desired window. The sensor reads out 2 pixels in one single clock cycle. As a consequence, the granularity for configuring the x−start position is also 2 pixels for no sub sampling. The value configured in the x−start register is multiplied by 2 to find the corresponding column in the pixel array. • x−end[8:0] This register defines the window end point on the x−axis. Similar to x−start, the granularity for this configuration is one kernel. x−end needs to be larger than x−start. • y−start[9:0] The starting line of the readout window. The granularity of this setting is one line, except with color sensors where it needs to be an even number. • y−end[9:0] The end line of the readout window. y−end must be configured larger than y−start. This setting has the same granularity as the y−start configuration. Up to four windows can be defined, possibly (partially) overlapping, as illustrated in Figure 26. NOTE: The least significant configuration bits for x and y parameters are located in separate registers (refer to registers 264−265). One may decide not to reconfigure these bits, in which case the configuration granularity becomes 4 pixels for both x− and y−configurations. Figure 26. Overlapping Multiple Window Configuration y0_start y1_start y0_end y1_end x0_start x1_start x0_end x1_end ROI 0 ROI 1 The sequencer analyses each line that need to be read out for multiple windows. Restrictions The following restrictions for each line are assumed for the user configuration: • Windows are ordered from left to right, based on their x−start address: x_start_roi(i) x_start_roi(j) AND v x_end_roi(i) x_end_roi(j) v Where j i > Processing Multiple Windows The sequencer control block houses two sets of counters to construct the image frame. As previously described, the y−counter indicates the line that needs to be read out and is incremented at the end of each line. For the start of the frame, it is initialized to the y−start address of the first window and it runs until the y−end address of the last window to be read out. The last window is configured by the configuration registers and it is not necessarily window #3. The x−counter starts counting from the x−start address of the window with the lowest ID which is active on the addressed line. Only windows for which the current y−address is enclosed are taken into account for scanning. Other windows are skipped. |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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