Knowledge (XXG)

Color filter array

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Theuwissen says "Previously, the color filter was fabricated on a separate glass plate and glued to the CCD (Ishikawa 81), but nowadays, all single-chip color cameras are provided with an imager which has the color filter on-chip processed (Dillon 78) and not as a hybrid." He provides a bibliography
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per inch (PPI). However, due to the CFA, the resolution of the device drops when displaying color images, say to 100 PPI. When the image to be displayed consists of both a colored and a black and white section, for example when a book page comprises plain text as well as a color photo, some e book
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An RGBW matrix (from red, green, blue, white) is a CFA that includes "white" or transparent filter elements that allow the photodiode to respond to all colors of light; that is, some cells are "panchromatic", and more of the light is detected, rather than absorbed, compared to the Bayer matrix.
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line), where a low-temperature regime must be rigidly observed (due to the low melting temperature of the aluminum metalized "wires" and the substrate mobility of the dopants implanted within the bulk silicon), organics would be preferred over glass. On the other hand, some CVD silicon oxide
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Filter materials are manufacturer specific. Adams et al. state "Several factors influence the CFA's design. First, the individual CFA filters are usually layers of transmissive (absorptive) organic or pigment dyes. Ensuring that the dyes have the right mechanical properties—such as ease of
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Some sources indicate that the CFA can be manufactured separately and affixed after the sensor has been manufactured, while other sensors have the CFA manufactured directly on the surface of the imager. Theuwissen makes no mention of the materials utilized in CFA manufacture.
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uses a different structure such that a pixel utilizes properties of multi-junctions to stack blue, green, and red sensors on top of each other. This arrangement does not require a demosaicing algorithm because each pixel has information about each color.
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The third method, as in ClearInk, uses a CFA consisting of a front layer of wells with hemispherical bottoms above a layer of fluid containing black charged spheres. When the spheres are away from the hemispheres, the hemispheres reflect brightly due to
691:. This method suffers from often slow refresh rates as with several pigments the display must perform refreshes for each pigment. As with grey scale units, after the display is updated the device does not require power to keep the image on screen. 686:
There are three primary methods for reproducing color on e paper displays. One uses micro spheres in various pigments, such as the limited color range three pigment Spectra displays or more faithful four pigment Advanced Color ePaper, both by
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light needed to properly expose the polymer, though solutions have been found for this problem. Color photoresists sometimes used include those with chemical monikers CMCR101R, CMCR101G, CMCR101B, CMCR106R, CMCR106G, and CMCR106B.
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announced several RGBW CFA patents in 2007, all of which have the property that when the panchromatic cells are ignored, the remaining color filtered cells are arranged such that their data can be processed with a standard Bayer
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In U.S.P.# 4,808,501, Carl Chiulli cites the use of 5 chemicals, three of which are C.I. #12715, AKA Solvent Red 8; Solvent Yellow 88; and C.I. # 61551, Solvent Blue 36. In U.S.P. # 5,096,801 Koya
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devices may display the photo at the reduced resolution while the text is at the normal resolution. As the CFA is LCD based, the CFA requires constant power to run and uses more energy.
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application, durability, and resistance to humidity and other atmospheric stresses—is a challenging task. This makes it difficult, at best, to fine-tune the spectral responsivities.".
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array. Further, a short discussion of anti-reflection films is offered, though Janesick's work appears is more concerned with photon–silicon interaction. Early work on
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Used in the automotive industry. Similar to the Bayer sensor except the green pixels are clear, providing more low-light sensitivity and less noise.
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A few sources discuss other specific chemical substances, attending optical properties, and optimal manufacturing processes of color filter arrays.
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filter the light by wavelength range, such that the separate filtered intensities include information about the color of light. For example, the
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is one material used as the carrier for making color filters from color dyes or pigments. There is some interference between the dyes and the
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sensor is desired for maximum sensitivity, with the red channel required for regions of interest such as traffic lights and rear lights.
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Murakami; et al. (August 2000). "Technologies to Improve Photo-Sensitivity and Reduce VOD Shutter Voltage for CCD Image Sensors".
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At least one early example of an on-chip design utilized gelatin filters (Aoki et al., 1982). The gelatin is sectionalized, via
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system, as a whole, benefits from careful consideration of CFA technologies and their interplay with other sensor properties.
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The Bayer color filter mosaic. Each two-by-two submosaic contains 2 green, 1 blue, and 1 red filter, each filter covering one
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The second common method uses a typical grey scale e paper display behind a transparent color layer. The color layer is a
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devices where it means a mosaic of tiny color filters placed over the grey scale display panel to reproduce color images.
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Takizawa; et al. (1983). "Field Integration Mode CCD Color Television Camera Using Frequency Interleaving Method".
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distinguishes the approaches as "vertical color filter" for the Foveon X3 versus "lateral color filter" for the CFA.
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television). They require more energy to operate than a plain E Ink display but much less than a LCD based display.
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Ishihara, Y.; Tanigaki, K. (1983). "A high photosensitive IL-CCD image sensor with monolithic resin lens array".
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of the CFA elements along with the demosaicing algorithm jointly determine the color rendition. The sensor's
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Ishikawa; et al. (1981). "Color Reproduction of a Single Chip Color Camera with a Frame Transfer CCD".
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based CFA. When displaying grey scale images the device runs at its native resolution, for instance, 300
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Knop and Morf (August 1985). "A New Class of Mosaic Color Encoding Patterns for Single-Chip Cameras".
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For instance, Nakamura said that materials for on-chip color filter arrays fall into two categories:
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Agranov; et al. (January 2003). "Crosstalk and Microlens Study in a Color CMOS Image Sensor".
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Color filters are needed because the typical photosensors detect light intensity with little or no
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Similar to Quad Bayer filter, but with RYYB instead of RGGB. i.e. 4x blue, 4x red, and 8x yellow.
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Bayer-like with one of the green filters modified to "emerald"; used in a few Sony cameras.
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Dillon; et al. (February 1978). "Color Imaging System Using a Single CCD Area Array".
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specificity and therefore cannot separate color information. Since sensors are made of
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Nakamura provides a schematic and bibliographic items illustrating the importance of
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Adaptive Colorimetric Characterization of Digital Camera with White Balance
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Aoki; et al. (1982). "2/3-Inch Format MOS Single-Chip Color Imager".
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One cyan, one yellow, one green, and one magenta; used in a few cameras.
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algorithm which is tailored for each type of color filter. The spectral
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A CYGM matrix (cyan, yellow, green, magenta) is a CFA that uses mostly
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One cyan, two yellow, and one magenta; used in a few cameras of Kodak.
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Similar to Bayer filter, however with 9x blue, 9x red, and 18x green.
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and span of the CFA's spectral responses are typically wider than the
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Given that the CFAs are deposited on the image sensor surface at the
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Similar to Bayer filter, however with 4x blue, 4x red, and 8x green.
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Murata; et al. (1983). "Development of a 3-MOS Color Camera".
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Handbook of Holographic Interferometry: Optical and Digital Methods
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Tanaka; et al. (1990). "HDTV Single-Chip CCD Color Camera".
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Comparison of the spectral response of a Nikon D70 vs. Canon 10D
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Soo-Wook Jang; Eun-Su Kim; Sung-Hak Lee; Kyu-Ik Sohng (2005).
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Image Sensors and Signal Processing for Digital Still Cameras
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patterns, and spatial frequencies of the absorptive filters.
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Sugiyama filed for a patent on such an arrangement in 2005.
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Three example RGBW filters from Kodak, with 50% white. (
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filter, with a large pattern, studied for diminishing
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Traditional RGBW similar to Bayer and RGBE patterns.
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Conley, Will (ed.). 8: 1643:1983 International Electron Devices Meeting 1471:Introduction to Semiconductor Manufacturing 1069:"IISS Image Pipe for Alternate CFA Formats" 638:Some pigment and dye molecules used in CFAs 606:(back end of line, the later stages of the 2780: 2572: 2317: 2160: 1790: 1768: 1754: 1746: 1367:IEEE Transactions on Consumer Electronics 1255:IEEE Transactions on Consumer Electronics 611:processes are low temperature processes. 2549:International Commission on Illumination 778:Image Sensor Solutions: Application Note 634:that possesses color filter properties. 174: 1282: 1280: 1188: 1186: 780:. Revision 2.0. Kodak. 27 October 2003. 728: 2539:Color Association of the United States 1172: 1161: 890:Sony Global - Sony Global Headquarters 738: 736: 734: 732: 650:Optically efficient CFA implementation 74:The term is also used in reference to 1583:IEEE Transactions on Electron Devices 1540:IEEE Transactions on Electron Devices 1437:"Color Processing in Digital Cameras" 1394:IEEE Transactions on Electron Devices 1332:IEEE Transactions on Electron Devices 1289:IEEE Transactions on Electron Devices 1063: 1061: 1003: 1001: 662:, and the interplay with the CFA and 7: 1220:IEEE Journal of Solid-State Circuits 771:"Color Correction for Image Sensors" 539:Manufacture of the image sensor CFA 477:Used in the automotive industry. 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2623: 2622: 2621: 2618: 2616: 2613: 2611: 2608: 2606: 2603: 2601: 2598: 2596: 2593: 2591: 2588: 2586: 2583: 2582: 2580: 2578: 2574: 2571: 2567: 2561: 2558: 2556: 2553: 2550: 2547: 2545: 2542: 2540: 2537: 2535: 2532: 2530: 2527: 2526: 2524: 2522:organizations 2518: 2508: 2505: 2503: 2500: 2496: 2493: 2491: 2488: 2486: 2483: 2481: 2478: 2476: 2473: 2472: 2471: 2468: 2464: 2463:Pastel colors 2461: 2460: 2459: 2456: 2452: 2449: 2448: 2447: 2444: 2443: 2441: 2437: 2429: 2426: 2424: 2421: 2419: 2416: 2414: 2411: 2410: 2408: 2404: 2401: 2400: 2399: 2396: 2395: 2393: 2391: 2387: 2381: 2378: 2376: 2373: 2371: 2368: 2366: 2363: 2361: 2358: 2356: 2353: 2351: 2348: 2346: 2343: 2341: 2338: 2336: 2333: 2331: 2328: 2327: 2325: 2323: 2319: 2316: 2314: 2310: 2299: 2298: 2294: 2291: 2290: 2286: 2284: 2281: 2278: 2275: 2273: 2270: 2268: 2265: 2263: 2260: 2258: 2255: 2251: 2248: 2246: 2245:Primary color 2243: 2242: 2241: 2238: 2237: 2235: 2233: 2229: 2223: 2220: 2218: 2215: 2213: 2212:Light-on-dark 2210: 2206: 2203: 2201: 2198: 2196: 2193: 2191: 2188: 2184: 2181: 2180: 2179: 2176: 2175: 2174: 2171: 2170: 2168: 2166: 2162: 2159: 2157: 2151: 2146: 2132: 2131:Color mapping 2129: 2127: 2124: 2118: 2115: 2114: 2113: 2110: 2106: 2103: 2102: 2101: 2098: 2097: 2096: 2093: 2089: 2086: 2084: 2081: 2080: 2079: 2076: 2074: 2071: 2069: 2066: 2062: 2059: 2057: 2056:Color balance 2054: 2053: 2052: 2049: 2048: 2046: 2044: 2040: 2034: 2033:Chromotherapy 2031: 2029: 2026: 2024: 2021: 2019: 2016: 2014: 2011: 2009: 2006: 2004: 2001: 1999: 1996: 1995: 1993: 1991: 1987: 1981: 1980: 1976: 1974: 1973:Tetrachromacy 1971: 1967: 1964: 1962: 1959: 1958: 1957: 1954: 1952: 1949: 1947: 1944: 1942: 1939: 1937: 1934: 1932: 1929: 1925: 1922: 1921: 1920: 1917: 1915: 1912: 1910: 1907: 1903: 1900: 1898: 1897:Achromatopsia 1895: 1894: 1893: 1890: 1886: 1883: 1882: 1881: 1880:Chromesthesia 1878: 1877: 1875: 1873: 1869: 1863: 1860: 1858: 1855: 1851: 1848: 1847: 1846: 1843: 1839: 1836: 1834: 1831: 1830: 1829: 1826: 1824: 1821: 1817: 1814: 1812: 1809: 1807: 1804: 1803: 1802: 1799: 1798: 1796: 1794:Color physics 1792: 1789: 1787: 1786:Color science 1783: 1778: 1771: 1766: 1764: 1759: 1757: 1752: 1751: 1748: 1730: 1726: 1720: 1717: 1705: 1701: 1695: 1692: 1687: 1683: 1679: 1675: 1674:SMPTE Journal 1668: 1665: 1660: 1656: 1652: 1648: 1644: 1637: 1634: 1629: 1627:0-8194-3698-4 1623: 1619: 1612: 1609: 1604: 1600: 1596: 1592: 1588: 1584: 1577: 1574: 1569: 1565: 1561: 1557: 1553: 1549: 1545: 1541: 1534: 1531: 1520:on 2010-10-10 1519: 1515: 1511: 1505: 1502: 1491:on 2008-12-04 1490: 1486: 1480: 1477: 1472: 1469:Xiao (2001). 1465: 1462: 1457: 1453: 1449: 1445: 1438: 1431: 1428: 1423: 1419: 1415: 1411: 1407: 1403: 1399: 1395: 1388: 1385: 1380: 1376: 1372: 1368: 1361: 1358: 1353: 1349: 1345: 1341: 1337: 1333: 1326: 1323: 1318: 1314: 1310: 1306: 1302: 1298: 1294: 1290: 1283: 1281: 1277: 1272: 1268: 1264: 1260: 1256: 1249: 1246: 1241: 1237: 1233: 1229: 1225: 1221: 1214: 1211: 1206: 1200: 1196: 1189: 1187: 1183: 1178: 1165: 1157: 1153: 1147: 1144: 1139: 1135: 1131: 1127: 1123: 1119: 1115: 1111: 1107: 1103: 1099: 1092: 1089: 1086: 1081: 1078: 1070: 1064: 1062: 1058: 1047: 1041: 1038: 1030: 1024: 1021: 1010: 1004: 1002: 998: 987: 983: 977: 974: 963: 959: 953: 950: 939: 935: 929: 926: 915: 911: 905: 902: 891: 887: 881: 878: 873: 871:3-527-60492-8 867: 864:. Wiley-VCH. 863: 862: 854: 851: 846: 842: 836: 833: 828: 822: 818: 814: 810: 806: 799: 796: 792: 787: 784: 779: 772: 766: 763: 758: 752: 749:. CRC Press. 748: 747: 739: 737: 735: 733: 729: 722: 720: 718: 714: 710: 704: 701: 697: 692: 690: 681: 679: 677: 673: 669: 665: 661: 657: 649: 647: 645: 637: 635: 633: 629: 625: 621: 617: 612: 609: 605: 600: 596: 594: 589: 585: 583: 579: 573: 571: 567: 562: 559: 556: 552: 549: 545: 538: 536: 534: 526: 524: 522: 517: 508: 501: 498: 495: 492: 488: 487: 483: 480: 476: 473: 470: 466: 465: 461: 458: 456: 453: 451: 450: 447: 445: 441: 435: 433: 430: 428: 427: 421: 419: 415: 411: 407: 401: 399: 396: 394: 393: 389: 386: 382: 378: 375: 373: 370: 367: 363: 362: 358: 355: 352: 348: 347: 343: 340: 336: 335: 328: 327: 318: 315: 311: 310: 306: 303: 300: 297: 293: 292: 288: 285: 283: 280: 277: 273: 272: 268: 265: 263: 260: 257: 253: 252: 248: 245: 242: 239: 235: 234: 230: 227: 225: 222: 219: 215: 214: 210: 207: 203: 201: 198: 195: 191: 190: 186: 183: 180: 177: 176: 170: 168: 166: 162: 157: 152: 150: 146: 142: 138: 135: 131: 127: 124: 120: 119:transmittance 116: 112: 108: 104: 99: 97: 93: 89: 81: 79: 77: 72: 71:information. 70: 66: 62: 58: 54: 50: 46: 42: 34: 29: 19: 2495:Fluorescence 2458:Colorfulness 2451:Dichromatism 2295: 2287: 2257:Chromaticity 2240:Color mixing 2232:Color theory 2165:Color scheme 2028:Chromophobia 1977: 1733:. Retrieved 1731:. 2020-04-06 1728: 1719: 1708:. Retrieved 1703: 1694: 1677: 1673: 1667: 1642: 1636: 1617: 1611: 1586: 1582: 1576: 1543: 1539: 1533: 1522:. Retrieved 1518:the original 1513: 1504: 1493:. Retrieved 1489:the original 1479: 1470: 1464: 1450:(6): 20–31. 1447: 1443: 1430: 1397: 1393: 1387: 1370: 1366: 1360: 1335: 1331: 1325: 1292: 1288: 1254: 1248: 1223: 1219: 1213: 1194: 1164:cite journal 1156:the original 1146: 1105: 1101: 1091: 1080: 1049:. Retrieved 1040: 1023: 1012:. Retrieved 989:. Retrieved 985: 976: 965:. Retrieved 961: 952: 941:. Retrieved 937: 928: 917:. Retrieved 913: 904: 893:. Retrieved 889: 880: 860: 853: 844: 835: 804: 798: 786: 777: 765: 745: 705: 693: 685: 653: 643: 641: 632:photoresists 613: 601: 597: 590: 586: 574: 563: 560: 542: 530: 512: 440:Leica camera 437: 403: 385:Moiré effect 323: 243:RYYB filter 204:Very common 200:Bayer filter 161:Dick Merrill 153: 107:Bayer filter 100: 94:, they obey 85: 73: 65:image sensor 56: 52: 48: 44: 38: 33:pixel sensor 2632:Color chart 2490:Iridescence 2322:Basic terms 2313:Color terms 2267:Color wheel 2262:Color solid 2126:Color space 2112:subtractive 2095:Color model 1966:Unique hues 1862:Colorimetry 1828:Chromophore 1546:(1): 4–11. 938:www.ovt.com 682:E-paper CFA 670:and on the 668:microlenses 656:microlenses 555:ultraviolet 551:photoresist 527:CYGM sensor 523:algorithm. 521:demosaicing 509:RGBW sensor 301:RGBW Bayer 282:CYGM filter 262:CYYM filter 224:RGBE filter 184:Description 145:tristimulus 115:demosaicing 67:to capture 2800:Categories 2652:Shades of: 2485:Brightness 2217:Web colors 2173:Color tool 2156:philosophy 2061:Color cast 1961:Afterimage 1951:Metamerism 1924:Color code 1919:Color task 1902:Dichromacy 1735:2021-04-12 1710:2021-04-12 1524:2010-11-01 1495:2008-11-17 1444:IEEE Micro 1051:2021-01-03 1014:2021-01-03 991:2020-02-14 967:2019-08-16 943:2019-08-16 919:2019-08-16 895:2019-08-16 723:References 620:thin films 479:monochrome 444:Huawei P30 418:OmniVision 398:Quad Bayer 381:RGB matrix 379:-specific 101:The color 88:wavelength 2502:Grayscale 2475:Lightness 2470:Luminance 2279:(fashion) 1979:The dress 1568:0018-9383 1138:109585024 1130:0277-786X 672:three-CCD 580:effects, 410:Tetracell 2775:Category 2757:Lighting 2480:Darkness 2300:(Goethe) 2100:additive 2088:Quattron 1659:25401214 1620:. SPIE. 1422:47298619 1271:29448168 660:f-number 658:, their 628:Cryolite 578:aliasing 455:Nonacell 404:Used by 377:Fujifilm 356:RGBW #3 344:RGBW #2 319:RGBW #1 123:passband 2739:Related 2700:Magenta 2625:history 2529:Pantone 1816:Visible 1811:Rainbow 1591:Bibcode 1548:Bibcode 1402:Bibcode 1340:Bibcode 1317:8503745 1297:Bibcode 1228:Bibcode 1110:Bibcode 566:pigment 548:novolac 414:Samsung 372:X-Trans 139:, so a 103:filters 76:e paper 2752:Qualia 2747:Vision 2695:Purple 2690:Violet 2670:Yellow 2665:Orange 2360:Orange 2355:Purple 2345:Yellow 1779:topics 1657:  1624:  1566:  1420:  1315:  1269:  1201:  1136:  1128:  868:  823:  753:  700:pixels 676:camera 644:et al. 546:(DNQ)- 165:Foveon 51:), or 2785:Index 2725:Black 2715:White 2710:Brown 2675:Green 2577:Lists 2569:Names 2551:(CIE) 2520:Color 2380:Brown 2375:White 2365:Black 2335:Green 2154:Color 1850:Water 1806:Light 1777:Color 1655:S2CID 1440:(PDF) 1418:S2CID 1313:S2CID 1267:S2CID 1134:S2CID 1072:(PDF) 1032:(PDF) 774:(PDF) 689:E Ink 582:moire 516:Kodak 496:RCCB 474:RCCC 178:Image 69:color 61:pixel 2720:Gray 2705:Pink 2685:Blue 2680:Cyan 2370:Gray 2350:Pink 2330:Blue 2117:CMYK 1622:ISBN 1564:ISSN 1199:ISBN 1177:help 1126:ISSN 1106:3678 866:ISBN 821:ISBN 751:ISBN 717:NTSC 626:and 604:BEOL 568:and 502:2x2 484:2x2 462:6×6 424:4×4 406:Sony 390:6×6 359:2×4 332:4×4 324:See 307:2×2 289:2×2 269:2×2 249:2×2 231:2×2 211:2×2 181:Name 154:The 43:, a 2660:Red 2446:Hue 2340:Red 2105:RGB 1729:MUO 1682:doi 1647:doi 1599:doi 1556:doi 1452:doi 1410:doi 1375:doi 1348:doi 1305:doi 1259:doi 1236:doi 1118:doi 813:doi 713:PAL 696:LCD 664:CCD 624:ZnS 622:of 570:dye 412:by 206:RGB 163:of 134:CIE 57:CFM 49:CFA 39:In 2802:: 1727:. 1702:. 1678:92 1676:. 1653:. 1597:. 1587:47 1585:. 1562:. 1554:. 1544:50 1542:. 1512:. 1448:18 1446:. 1442:. 1416:. 1408:. 1398:29 1396:. 1371:36 1369:. 1346:. 1336:25 1334:. 1311:. 1303:. 1293:32 1291:. 1279:^ 1265:. 1234:. 1224:16 1222:. 1185:^ 1168:: 1166:}} 1162:{{ 1132:. 1124:. 1116:. 1100:. 1060:^ 1000:^ 984:. 960:. 936:. 912:. 888:. 843:. 819:. 807:. 776:. 731:^ 420:. 387:. 329:) 151:. 98:. 1769:e 1762:t 1755:v 1738:. 1713:. 1688:. 1684:: 1661:. 1649:: 1630:. 1605:. 1601:: 1593:: 1570:. 1558:: 1550:: 1527:. 1498:. 1473:. 1458:. 1454:: 1424:. 1412:: 1404:: 1381:. 1377:: 1354:. 1350:: 1342:: 1319:. 1307:: 1299:: 1273:. 1261:: 1242:. 1238:: 1230:: 1207:. 1179:) 1175:( 1140:. 1120:: 1112:: 1074:. 1054:. 1034:. 1017:. 994:. 970:. 946:. 922:. 898:. 874:. 847:. 829:. 815:: 759:. 55:( 47:( 35:. 20:)

Index

Color filter mosaic

pixel sensor
digital imaging
pixel
image sensor
color
e paper
wavelength
semiconductors
solid-state physics
filters
Bayer filter
primary colors
demosaicing
transmittance
passband
quantum efficiency
visible spectrum
CIE
color matching functions
color translation
tristimulus
absolute color space
Foveon X3 sensor
Dick Merrill
Foveon
Bayer pattern
Bayer filter
RGB

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