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AD9381 Folha de dados(PDF) 11 Page - Analog Devices |
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AD9381 Folha de dados(HTML) 11 Page - Analog Devices |
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11 / 44 page  AD9381 Rev. 0 | Page 11 of 44 4:4:4 TO 4:2:2 FILTER The AD9381 contains a filter that allows it to convert a signal from YCrCb 4:4:4 to YCrCb 4:2:2 while maintaining the maximum accuracy and fidelity of the original signal. Input Color Space to Output Color Space The AD9381 can accept a wide variety of input formats and either retain that format or convert to another. Input formats supported are: • 4:4:4 YCrCb 8-bit • 4:2:2 YCrCb 8-bit, 10-bit, and 12-bit • RGB 8-bit Output modes supported are: • 4:4:4 YCrCb 8-bit • 4:2:2 YCrCb 8-bit, 10-bit, and 12-bit • Dual 4:2:2 YCrCb 8-bit Color Space Conversion (CSC) Matrix The CSC matrix in the AD9381 consists of three identical processing channels. In each channel, three input values are multiplied by three separate coefficients. Also included are an offset value for each row of the matrix and a scaling multiple for all values. Each value has a 13-bit, twos complement resolution to ensure the signal integrity is maintained. The CSC is designed to run at speeds up to 150 MHz supporting resolu- tions up to 1080p at 60 Hz. With any-to-any color space support, formats such as RGB, YUV, YCbCr, and others are supported by the CSC. The main inputs, RIN, GIN, and BIN come from the 8- to 12-bit inputs from each channel. These inputs are based on the input format detailed in Table 7. The mapping of these inputs to the CSC inputs is shown in Table 8. Table 8. CSC Port Mapping Input Channel CSC Input Channel R/CR RIN Gr/Y GIN B/CB BIN One of the three channels is represented in Figure 6. In each processing channel, the three inputs are multiplied by three separate coefficients marked a1, a2, and a3. These coefficients are divided by 4096 to obtain nominal values ranging from –0.9998 to +0.9998. The variable labeled a4 is used as an offset control. The CSC_Mode setting is the same for all three processing channels. This multiplies all coefficients and offsets by a factor of 2CSC_Mode. The functional diagram for a single channel of the CSC, as shown in Figure 6, is repeated for the remaining G and B channels. The coefficients for these channels are b1, b2, b3, b4, c1, c2, c3, and c4. ×2 2 1 0 × × × a1[12:0] a2[12:0] a3[12:0] RIN [11:0] GIN [11:0] BIN [11:0] + ×4 CSC_Mode[1:0] a4[12:0] ROUT [11:0] + 1 4096 × 1 4096 × 1 4096 × + Figure 6. Single CSC Channel A programming example and register settings for several common conversions are listed in the Color Space Converter (CSC) Common Settings section. For a detailed functional description and more programming examples, please refer to the application note AN-795, AD9800 Color Space Converter User's Guide. |
Nº de peça semelhante - AD9381_15 |
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Descrição semelhante - AD9381_15 |
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