In this challenge, you need to find a specific pixel within an photograph (taken with a real camera).
You are passed an (R, G, B) tuple and an image, and you need to return a point (x,y) within the image that matches the RGB color given. The image may have multiple points that match the color; you only need to find 1.
The challenge is that you need to do it while reading as few pixels as possible. Your score will be total number of pixels read across all test cases.
If you wish, you can read the entire image into an array of RGB values, as long as you don't do any processing on the pixels. I allow this purely for efficiency purposes. For example, in Python, list(Image.open("image_name+".jpg").convert("RGB").getdata())
is ok.
Hardcoding locations is not allowed. Your algorithm should work well for more than just the test cases listed below. You are not allowed to save data between test cases. I've chosen RGB values that appear infrequently (<10
) in the image (in case that makes a difference for your algorithm). If you are using randomness in your algorithm, please set a seed, so that your score is constant.
Images can be found on Github
Test cases:
image_name:
(r, g, b) [all possible answers]
barn:
(143,91,33) [(887,1096),(2226,1397),(2007,1402),(2161,1508),(1187,1702)]
(53,35,59) [(1999,1260)]
(20,24,27) [(1328,1087),(154,1271)]
(167,148,176) [(1748,1204)]
(137,50,7) [(596,1498)]
(116,95,94) [(1340,1123)]
(72,49,59) [(1344,857),(1345,858),(1380,926),(1405,974),(1480,1117)]
(211,163,175) [(1963,745)]
(30,20,0) [(1609,1462),(1133,1477),(1908,1632)]
(88,36,23) [(543,1494),(431,1575)]
daisy:
(21,57,91) [(1440,1935),(2832,2090),(2232,2130),(1877,2131),(1890,2132)]
(201,175,140) [(1537,1749),(2319,1757)]
(169,160,0) [(2124,759)]
(113,123,114) [(1012,994),(2134,1060),(1803,1183),(1119,1335)]
(225,226,231) [(3207,829),(3256,889),(3257,889),(1434,981),(2599,1118),(2656,1348),(2656,1351)]
(17,62,117) [(2514,3874),(2336,3885)]
(226,225,204) [(3209,812)]
(119,124,146) [(2151,974),(2194,1021),(2194,1022),(2202,1034),(2812,1500)]
(2,63,120) [(2165,3881),(2326,3882),(2330,3882),(2228,3887)]
(200,167,113) [(1453,1759)]
dandelion:
(55,2,46) [(667,825),(668,825)]
(95,37,33) [(1637,1721),(1625,1724),(1405,1753),(2026,2276),(2016,2298)]
(27,41,50) [(1267,126),(424,519),(2703,1323),(1804,3466)]
(58,92,129) [(2213,3274)]
(136,159,105) [(1300,2363),(2123,2645),(1429,3428),(1430,3432),(1417,3467),(1393,3490),(1958,3493)]
(152,174,63) [(2256,2556)]
(78,49,19) [(2128,2836)]
(217,178,205) [(2736,3531)]
(69,95,130) [(870,305),(493,460),(2777,1085),(2791,1292),(2634,3100)]
(150,171,174) [(2816,1201),(2724,2669),(1180,2706),(1470,3215),(1471,3215)]
gerbera:
(218,186,171) [(4282,1342)]
(180,153,40) [(4596,1634),(4369,1682),(4390,1708),(4367,1750)]
(201,179,119) [(4282,1876),(4479,1928)]
(116,112,149) [(5884,252),(4168,371),(4169,372),(4164,384),(5742,576)]
(222,176,65) [(4232,1548)]
(108,129,156) [(5341,3574),(5339,3595),(5302,3734)]
(125,99,48) [(4548,1825),(4136,1932),(5054,2013),(5058,2023),(5058,2035),(5055,2050),(5031,2073)]
(170,149,32) [(4461,1630),(4520,1640)]
(156,185,203) [(3809,108)]
(103,67,17) [(4844,1790)]
hot-air:
(48,21,36) [(1992,1029),(2005,1030),(2015,1034),(2018,1036)]
(104,65,36) [(3173,1890),(3163,1893)]
(169,89,62) [(4181,931),(4210,938),(4330,1046),(4171,1056),(3117,1814)]
(68,59,60) [(1872,220),(1874,220),(1878,220),(1696,225),(3785,429)]
(198,96,74) [(4352,1057)]
(136,43,53) [(1700,931)]
(82,42,32) [(4556,961),(4559,973),(4563,989),(4563,990),(4441,1004),(4387,1126),(4378,1128)]
(192,132,72) [(1399,900),(3105,1822),(3104,1824),(3105,1824),(3107,1826),(3107,1827),(3104,1839),(3119,1852)]
(146,21,63) [(1716,993)]
(125,64,36) [(4332,937)]
in-input:
(204,90,1) [(1526,1997),(1385,2145),(4780,2807),(4788,3414)]
(227,163,53) [(1467,1739),(2414,1925),(2441,2198),(134,2446)]
(196,179,135) [(3770,2740),(1110,3012),(3909,3216),(1409,3263),(571,3405)]
(208,59,27) [(1134,1980),(4518,2108),(4515,2142)]
(149,70,1) [(4499,1790),(2416,2042),(1338,2150),(3731,2408),(3722,2409),(4400,3618)]
(168,3,7) [(987,402),(951,432),(1790,1213),(1790,1214),(1848,1217),(4218,1840),(4344,1870),(1511,1898)]
(218,118,4) [(3857,1701),(1442,1980),(1411,2156),(25,2606)]
(127,153,4) [(3710,2813)]
(224,230,246) [(2086,160),(2761,222),(4482,1442)]
(213,127,66) [(4601,1860),(4515,2527),(4757,2863)]
klatschmohn:
(170,133,19) [(1202,2274),(1202,2275),(957,2493),(1034,2633),(3740,3389),(3740,3391),(3683,3439)]
(162,92,4) [(489,2854)]
(159,175,104) [(3095,2475),(3098,2481)]
(199,139,43) [(1956,3055)]
(171,169,170) [(3669,1487),(3674,1490),(3701,1507)]
(184,115,58) [(1958,2404)]
(228,169,5) [(1316,2336),(1317,2336)]
(179,165,43) [(3879,2380),(1842,2497),(1842,2498)]
(67,21,6) [(1959,2197),(2157,2317),(2158,2317),(2158,2318),(2116,2373)]
(213,100,106) [(1303,1816)]
tajinaste-rojo:
(243,56,99) [(1811,2876),(1668,4141),(2089,4518),(1981,4732),(1659,4778),(2221,5373),(1779,5598),(2210,5673),(2373,5860)]
(147,157,210) [(1835,1028),(1431,3358)]
(114,37,19) [(1792,3572),(1818,3592)]
(108,117,116) [(2772,4722),(1269,5672),(2512,5811),(2509,5830),(2186,5842),(2186,5846),(2190,5851),(2211,5884)]
(214,197,93) [(1653,4386)]
(163,102,101) [(2226,2832),(2213,3683),(1894,4091),(1875,4117)]
(192,192,164) [(2175,2962),(2206,3667),(2315,3858),(1561,3977),(3039,5037),(3201,5641)]
(92,118,45) [(1881,1704),(1983,1877),(2254,2126),(3753,5862),(3766,5883)]
(145,180,173) [(1826,1585)]
(181,124,105) [(1969,3892)]
turret-arch:
(116,70,36) [(384,648),(516,669)]
(121,115,119) [(2419,958)]
(183,222,237) [(172,601),(183,601),(110,611),(111,617)]
(237,136,82) [(2020,282),(676,383),(748,406),(854,482),(638,497),(647,661),(1069,838),(1809,895),(1823,911)]
(193,199,215) [(1567,919),(1793,1047)]
(33,30,25) [(1307,861),(309,885),(1995,895),(504,1232),(2417,1494)]
(17,23,39) [(1745,1033),(788,1090),(967,1250)]
(192,139,95) [(1445,1337)]
(176,125,98) [(1197,1030)]
(178,83,0) [(2378,1136)]
water-lilies:
(86,140,80) [(2322,2855),(4542,3005),(4540,3006),(4577,3019)]
(218,124,174) [(1910,2457)]
(191,77,50) [(2076,1588)]
(197,211,186) [(4402,1894)]
(236,199,181) [(2154,1836)]
(253,242,162) [(1653,1430)]
(114,111,92) [(1936,2499)]
(111,93,27) [(2301,2423),(2127,2592),(2137,2717),(2147,2717)]
(139,92,102) [(1284,2243),(1297,2258)]
(199,157,117) [(3096,993)]