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LF2301JC55 Folha de dados(PDF) 7 Page - LOGIC Devices Incorporated |
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LF2301JC55 Folha de dados(HTML) 7 Page - LOGIC Devices Incorporated |
7 / 18 page DEVICES INCORPORATED Video Imaging Products 2-7 LF2301 Image Resampling Sequencer 08/16/2000–LDS.2301-H Static Filter Static filtering at real-time video rates can be performed as shown in Figure 5. This mode is selected by loading M1-0 with “00” for a clock- wise spiral walk. A counterclock- wise spiral walk could be selected by loading M1-0 with “10.” In this example, a static filter with a kernel size of 3 x 3 pixels is desired. Load- ing K3-0 with “0010” selects a kernel size of 3 x 3. The first pixel selected is determined by x0 and y0. In this example, the first pixel is (6,6). In this case, the LF2301s should ad- dress consecutive pixels during each spiral walk. For this to occur, FOV must be set to 1 (F2-0 loaded with “001”). After the last pixel of a spiral walk has been selected, the next pixel address is determined by adding dx/du to the current X address and by adding dy/du to the current Y address (unless the kernel just completed was the last for that line). At the end of the first spiral walk, pixel (7,5) is addressed. Since the first pixel of the next spiral walk should be (7,6), dx/du is selected to be 0 and dy/du is selected to be 1. After the last pixel of the last spiral walk on the first line has been selected, the first pixel address of the second line is determined by adding dx/dv to x0 and by adding dy/dv to y0. Since the first pixel of the first spiral walk on the second line should be (6,7), dx/dv is selected to be 0 and dy/dv is se- lected to be 1. Second order differ- ential terms are not used in this filter and are therefore set to 0. UMIN and VMIN are both selected to be 6. UMAX and VMAX are both selected to be 7. Table 5 shows the values loaded into all Parameter Registers. Table 6 shows the ITS outputs for the 3 x 3 static filter. TABLE 5. PARAMETER REGISTERS ADDR Row (HEX) Column (HEX) 0000 000 000 0001 FFF FFF 0010 0C0 0C0 0011 000 100 0100 000 000 0101 100 101 0110 000 000 0111 200 201 1000 000 000 1001 000 000 1010 000 000 1011 000 000 1100 000 000 1101 000 000 1110 006 006 1111 007 007 1 = 1st pixel of 1st spiral walk, 2 = 1st pixel of 2nd spiral walk, etc. 4 6789 5 6 7 8 12 5 FIGURE 5. 3 ××××× 3 STATIC FILTER |
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Descrição semelhante - LF2301JC55 |
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