YUV格式有两大类：planar和packed。planar的YUV格式，先连续存储所有像素点的Y，紧接着存储所有像素点的U，随后是所有像素点的V，这里所讲述的就是这中存储格式的；packed的YUV格式，每个像素点的Y,U,V是连续交叉存储的。

　　色彩空间转换主要有三种方法，1、整点运算，即通过公式对每个点进行计算，速度超慢，基本只有在PC下才能够运行；2、查表法，即由由YUV直接查表得到对应的RGB值；3、通过汇编指令,可参考http://blog.csdn.net/alien75/article/details/7377179；

　　本文主要介绍第二种方法，经本人使用测试，第二种方法效率可以满足本人需求，且图片转换后颜色无失真、走样等情况发生，而第一种方法，在网上搜到的很多代码装换效率低不说，转换后的图像颜色都存在很严重的失真现象。

　　如下代码也是从一开源代码中扣出来的，只是从YUV420转换到RGB32格式，该转换方法在 ARM926EJ-S这种CPU下运算效率还是很高的。

 1 void yuv420_2_rgb8888(uint8_t  *dst_ptr_,
 2                 const uint8_t  *y_ptr,
 3                 const uint8_t  *u_ptr,
 4                 const uint8_t  *v_ptr,
 5                       int32_t   width,
 6                       int32_t   height)
 7 {
 8     uint32_t *tables = yuv2rgb565_table;
 9     uint32_t *dst_ptr = (uint32_t *)(void *)dst_ptr_;
10     int32_t   y_span = width;
11     int32_t   uv_span = width>>1;
12     int32_t   dst_span = width<<2;
13     dst_span >>= 2;
14
15     height -= 1;
16     while (height > 0)
17     {
18         height -= width<<16;
19         height += 1<<16;
20         while (height < 0)
21         {
22             /* Do 2 column pairs */
23             uint32_t uv, y0, y1;
24
25             uv  = READUV(*u_ptr++,*v_ptr++);
26             y1  = uv + READY(y_ptr[y_span]);
27             y0  = uv + READY(*y_ptr++);
28             FIXUP(y1);
29             FIXUP(y0);
30             STORE(y1, dst_ptr[dst_span]);
31             STORE(y0, *dst_ptr++);
32             y1  = uv + READY(y_ptr[y_span]);
33             y0  = uv + READY(*y_ptr++);
34             FIXUP(y1);
35             FIXUP(y0);
36             STORE(y1, dst_ptr[dst_span]);
37             STORE(y0, *dst_ptr++);
38             height += (2<<16);
39         }
40         if ((height>>16) == 0)
41         {
42             /* Trailing column pair */
43             uint32_t uv, y0, y1;
44
45             uv = READUV(*u_ptr,*v_ptr);
46             y1 = uv + READY(y_ptr[y_span]);
47             y0 = uv + READY(*y_ptr++);
48             FIXUP(y1);
49             FIXUP(y0);
50             STORE(y0, dst_ptr[dst_span]);
51             STORE(y1, *dst_ptr++);
52         }
53         dst_ptr += dst_span*2-width;
54         y_ptr   += y_span*2-width;
55         u_ptr   += uv_span-(width>>1);
56         v_ptr   += uv_span-(width>>1);
57         height = (height<<16)>>16;
58         height -= 2;
59     }
60     if (height == 0)
61     {
62         /* Trail row */
63         height -= width<<16;
64         height += 1<<16;
65         while (height < 0)
66         {
67             /* Do a row pair */
68             uint32_t uv, y0, y1;
69
70             uv  = READUV(*u_ptr++,*v_ptr++);
71             y1  = uv + READY(*y_ptr++);
72             y0  = uv + READY(*y_ptr++);
73             FIXUP(y1);
74             FIXUP(y0);
75             STORE(y1, *dst_ptr++);
76             STORE(y0, *dst_ptr++);
77             height += (2<<16);
78         }
79         if ((height>>16) == 0)
80         {
81             /* Trailing pix */
82             uint32_t uv, y0;
83
84             uv = READUV(*u_ptr++,*v_ptr++);
85             y0 = uv + READY(*y_ptr++);
86             FIXUP(y0);
87             STORE(y0, *dst_ptr++);
88         }
89     }
90 }

数据表

yuv2rgb565_table

/* For BREW or Symbian you might need to make this static const rather than* just const, and introduce a function to get the address. */
enum
{FLAGS         = 0x40080100
};#define READUV(U,V) (tables[256 + (U)] + tables[512 + (V)])
#define READY(Y)    tables[Y]
#define FIXUP(Y)                 \
do {                             \int tmp = (Y) & FLAGS;       \if (tmp != 0)                \{                            \tmp  -= tmp>>8;          \(Y)  |= tmp;             \tmp   = FLAGS & ~(Y>>1); \(Y)  += tmp>>8;          \}                            \
} while (0 == 1)#define STORE(Y,DSTPTR)     \
do {                        \(DSTPTR) = (Y & 0xFF) | (0xFF00 & (Y>>14)) | (0xFF0000 & (Y<<5));\
} while (0 == 1)const uint32_t yuv2rgb565_table[256*3] =
{/* y_table */0x7FFFFFEDU,0x7FFFFFEFU,0x7FFFFFF0U,0x7FFFFFF1U,0x7FFFFFF2U,0x7FFFFFF3U,0x7FFFFFF4U,0x7FFFFFF6U,0x7FFFFFF7U,0x7FFFFFF8U,0x7FFFFFF9U,0x7FFFFFFAU,0x7FFFFFFBU,0x7FFFFFFDU,0x7FFFFFFEU,0x7FFFFFFFU,0x80000000U,0x80400801U,0x80A01002U,0x80E01803U,0x81202805U,0x81803006U,0x81C03807U,0x82004008U,0x82604809U,0x82A0500AU,0x82E0600CU,0x8340680DU,0x8380700EU,0x83C0780FU,0x84208010U,0x84608811U,0x84A09813U,0x8500A014U,0x8540A815U,0x8580B016U,0x85E0B817U,0x8620C018U,0x8660D01AU,0x86C0D81BU,0x8700E01CU,0x8740E81DU,0x87A0F01EU,0x87E0F81FU,0x88210821U,0x88811022U,0x88C11823U,0x89012024U,0x89412825U,0x89A13026U,0x89E14028U,0x8A214829U,0x8A81502AU,0x8AC1582BU,0x8B01602CU,0x8B61682DU,0x8BA1782FU,0x8BE18030U,0x8C418831U,0x8C819032U,0x8CC19833U,0x8D21A034U,0x8D61B036U,0x8DA1B837U,0x8E01C038U,0x8E41C839U,0x8E81D03AU,0x8EE1D83BU,0x8F21E83DU,0x8F61F03EU,0x8FC1F83FU,0x90020040U,0x90420841U,0x90A21042U,0x90E22044U,0x91222845U,0x91823046U,0x91C23847U,0x92024048U,0x92624849U,0x92A2504AU,0x92E2604CU,0x9342684DU,0x9382704EU,0x93C2784FU,0x94228050U,0x94628851U,0x94A29853U,0x9502A054U,0x9542A855U,0x9582B056U,0x95E2B857U,0x9622C058U,0x9662D05AU,0x96C2D85BU,0x9702E05CU,0x9742E85DU,0x97A2F05EU,0x97E2F85FU,0x98230861U,0x98831062U,0x98C31863U,0x99032064U,0x99632865U,0x99A33066U,0x99E34068U,0x9A434869U,0x9A83506AU,0x9AC3586BU,0x9B23606CU,0x9B63686DU,0x9BA3786FU,0x9BE38070U,0x9C438871U,0x9C839072U,0x9CC39873U,0x9D23A074U,0x9D63B076U,0x9DA3B877U,0x9E03C078U,0x9E43C879U,0x9E83D07AU,0x9EE3D87BU,0x9F23E87DU,0x9F63F07EU,0x9FC3F87FU,0xA0040080U,0xA0440881U,0xA0A41082U,0xA0E42084U,0xA1242885U,0xA1843086U,0xA1C43887U,0xA2044088U,0xA2644889U,0xA2A4588BU,0xA2E4608CU,0xA344688DU,0xA384708EU,0xA3C4788FU,0xA4248090U,0xA4649092U,0xA4A49893U,0xA504A094U,0xA544A895U,0xA584B096U,0xA5E4B897U,0xA624C098U,0xA664D09AU,0xA6C4D89BU,0xA704E09CU,0xA744E89DU,0xA7A4F09EU,0xA7E4F89FU,0xA82508A1U,0xA88510A2U,0xA8C518A3U,0xA90520A4U,0xA96528A5U,0xA9A530A6U,0xA9E540A8U,0xAA4548A9U,0xAA8550AAU,0xAAC558ABU,0xAB2560ACU,0xAB6568ADU,0xABA578AFU,0xAC0580B0U,0xAC4588B1U,0xAC8590B2U,0xACE598B3U,0xAD25A0B4U,0xAD65B0B6U,0xADA5B8B7U,0xAE05C0B8U,0xAE45C8B9U,0xAE85D0BAU,0xAEE5D8BBU,0xAF25E8BDU,0xAF65F0BEU,0xAFC5F8BFU,0xB00600C0U,0xB04608C1U,0xB0A610C2U,0xB0E620C4U,0xB12628C5U,0xB18630C6U,0xB1C638C7U,0xB20640C8U,0xB26648C9U,0xB2A658CBU,0xB2E660CCU,0xB34668CDU,0xB38670CEU,0xB3C678CFU,0xB42680D0U,0xB46690D2U,0xB4A698D3U,0xB506A0D4U,0xB546A8D5U,0xB586B0D6U,0xB5E6B8D7U,0xB626C8D9U,0xB666D0DAU,0xB6C6D8DBU,0xB706E0DCU,0xB746E8DDU,0xB7A6F0DEU,0xB7E6F8DFU,0xB82708E1U,0xB88710E2U,0xB8C718E3U,0xB90720E4U,0xB96728E5U,0xB9A730E6U,0xB9E740E8U,0xBA4748E9U,0xBA8750EAU,0xBAC758EBU,0xBB2760ECU,0xBB6768EDU,0xBBA778EFU,0xBC0780F0U,0xBC4788F1U,0xBC8790F2U,0xBCE798F3U,0xBD27A0F4U,0xBD67B0F6U,0xBDC7B8F7U,0xBE07C0F8U,0xBE47C8F9U,0xBEA7D0FAU,0xBEE7D8FBU,0xBF27E8FDU,0xBF87F0FEU,0xBFC7F8FFU,0xC0080100U,0xC0480901U,0xC0A81102U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,0xC0E82104U,/* u_table */0x0C400103U,0x0C200105U,0x0C200107U,0x0C000109U,0x0BE0010BU,0x0BC0010DU,0x0BA0010FU,0x0BA00111U,0x0B800113U,0x0B600115U,0x0B400117U,0x0B400119U,0x0B20011BU,0x0B00011DU,0x0AE0011FU,0x0AE00121U,0x0AC00123U,0x0AA00125U,0x0A800127U,0x0A600129U,0x0A60012BU,0x0A40012DU,0x0A20012FU,0x0A000131U,0x0A000132U,0x09E00134U,0x09C00136U,0x09A00138U,0x09A0013AU,0x0980013CU,0x0960013EU,0x09400140U,0x09400142U,0x09200144U,0x09000146U,0x08E00148U,0x08C0014AU,0x08C0014CU,0x08A0014EU,0x08800150U,0x08600152U,0x08600154U,0x08400156U,0x08200158U,0x0800015AU,0x0800015CU,0x07E0015EU,0x07C00160U,0x07A00162U,0x07A00164U,0x07800166U,0x07600168U,0x0740016AU,0x0720016CU,0x0720016EU,0x07000170U,0x06E00172U,0x06C00174U,0x06C00176U,0x06A00178U,0x0680017AU,0x0660017CU,0x0660017EU,0x06400180U,0x06200182U,0x06000184U,0x05E00185U,0x05E00187U,0x05C00189U,0x05A0018BU,0x0580018DU,0x0580018FU,0x05600191U,0x05400193U,0x05200195U,0x05200197U,0x05000199U,0x04E0019BU,0x04C0019DU,0x04C0019FU,0x04A001A1U,0x048001A3U,0x046001A5U,0x044001A7U,0x044001A9U,0x042001ABU,0x040001ADU,0x03E001AFU,0x03E001B1U,0x03C001B3U,0x03A001B5U,0x038001B7U,0x038001B9U,0x036001BBU,0x034001BDU,0x032001BFU,0x032001C1U,0x030001C3U,0x02E001C5U,0x02C001C7U,0x02A001C9U,0x02A001CBU,0x028001CDU,0x026001CFU,0x024001D1U,0x024001D3U,0x022001D5U,0x020001D7U,0x01E001D8U,0x01E001DAU,0x01C001DCU,0x01A001DEU,0x018001E0U,0x016001E2U,0x016001E4U,0x014001E6U,0x012001E8U,0x010001EAU,0x010001ECU,0x00E001EEU,0x00C001F0U,0x00A001F2U,0x00A001F4U,0x008001F6U,0x006001F8U,0x004001FAU,0x004001FCU,0x002001FEU,0x00000200U,0xFFE00202U,0xFFC00204U,0xFFC00206U,0xFFA00208U,0xFF80020AU,0xFF60020CU,0xFF60020EU,0xFF400210U,0xFF200212U,0xFF000214U,0xFF000216U,0xFEE00218U,0xFEC0021AU,0xFEA0021CU,0xFEA0021EU,0xFE800220U,0xFE600222U,0xFE400224U,0xFE200226U,0xFE200228U,0xFE000229U,0xFDE0022BU,0xFDC0022DU,0xFDC0022FU,0xFDA00231U,0xFD800233U,0xFD600235U,0xFD600237U,0xFD400239U,0xFD20023BU,0xFD00023DU,0xFCE0023FU,0xFCE00241U,0xFCC00243U,0xFCA00245U,0xFC800247U,0xFC800249U,0xFC60024BU,0xFC40024DU,0xFC20024FU,0xFC200251U,0xFC000253U,0xFBE00255U,0xFBC00257U,0xFBC00259U,0xFBA0025BU,0xFB80025DU,0xFB60025FU,0xFB400261U,0xFB400263U,0xFB200265U,0xFB000267U,0xFAE00269U,0xFAE0026BU,0xFAC0026DU,0xFAA0026FU,0xFA800271U,0xFA800273U,0xFA600275U,0xFA400277U,0xFA200279U,0xFA20027BU,0xFA00027CU,0xF9E0027EU,0xF9C00280U,0xF9A00282U,0xF9A00284U,0xF9800286U,0xF9600288U,0xF940028AU,0xF940028CU,0xF920028EU,0xF9000290U,0xF8E00292U,0xF8E00294U,0xF8C00296U,0xF8A00298U,0xF880029AU,0xF860029CU,0xF860029EU,0xF84002A0U,0xF82002A2U,0xF80002A4U,0xF80002A6U,0xF7E002A8U,0xF7C002AAU,0xF7A002ACU,0xF7A002AEU,0xF78002B0U,0xF76002B2U,0xF74002B4U,0xF74002B6U,0xF72002B8U,0xF70002BAU,0xF6E002BCU,0xF6C002BEU,0xF6C002C0U,0xF6A002C2U,0xF68002C4U,0xF66002C6U,0xF66002C8U,0xF64002CAU,0xF62002CCU,0xF60002CEU,0xF60002CFU,0xF5E002D1U,0xF5C002D3U,0xF5A002D5U,0xF5A002D7U,0xF58002D9U,0xF56002DBU,0xF54002DDU,0xF52002DFU,0xF52002E1U,0xF50002E3U,0xF4E002E5U,0xF4C002E7U,0xF4C002E9U,0xF4A002EBU,0xF48002EDU,0xF46002EFU,0xF46002F1U,0xF44002F3U,0xF42002F5U,0xF40002F7U,0xF3E002F9U,0xF3E002FBU,/* v_table */0x1A09A000U,0x19E9A800U,0x19A9B800U,0x1969C800U,0x1949D000U,0x1909E000U,0x18C9E800U,0x18A9F800U,0x186A0000U,0x182A1000U,0x180A2000U,0x17CA2800U,0x17AA3800U,0x176A4000U,0x172A5000U,0x170A6000U,0x16CA6800U,0x168A7800U,0x166A8000U,0x162A9000U,0x160AA000U,0x15CAA800U,0x158AB800U,0x156AC000U,0x152AD000U,0x14EAE000U,0x14CAE800U,0x148AF800U,0x146B0000U,0x142B1000U,0x13EB2000U,0x13CB2800U,0x138B3800U,0x134B4000U,0x132B5000U,0x12EB6000U,0x12CB6800U,0x128B7800U,0x124B8000U,0x122B9000U,0x11EBA000U,0x11ABA800U,0x118BB800U,0x114BC000U,0x112BD000U,0x10EBE000U,0x10ABE800U,0x108BF800U,0x104C0000U,0x100C1000U,0x0FEC2000U,0x0FAC2800U,0x0F8C3800U,0x0F4C4000U,0x0F0C5000U,0x0EEC5800U,0x0EAC6800U,0x0E6C7800U,0x0E4C8000U,0x0E0C9000U,0x0DEC9800U,0x0DACA800U,0x0D6CB800U,0x0D4CC000U,0x0D0CD000U,0x0CCCD800U,0x0CACE800U,0x0C6CF800U,0x0C4D0000U,0x0C0D1000U,0x0BCD1800U,0x0BAD2800U,0x0B6D3800U,0x0B2D4000U,0x0B0D5000U,0x0ACD5800U,0x0AAD6800U,0x0A6D7800U,0x0A2D8000U,0x0A0D9000U,0x09CD9800U,0x098DA800U,0x096DB800U,0x092DC000U,0x090DD000U,0x08CDD800U,0x088DE800U,0x086DF800U,0x082E0000U,0x07EE1000U,0x07CE1800U,0x078E2800U,0x076E3800U,0x072E4000U,0x06EE5000U,0x06CE5800U,0x068E6800U,0x064E7800U,0x062E8000U,0x05EE9000U,0x05CE9800U,0x058EA800U,0x054EB800U,0x052EC000U,0x04EED000U,0x04AED800U,0x048EE800U,0x044EF000U,0x042F0000U,0x03EF1000U,0x03AF1800U,0x038F2800U,0x034F3000U,0x030F4000U,0x02EF5000U,0x02AF5800U,0x028F6800U,0x024F7000U,0x020F8000U,0x01EF9000U,0x01AF9800U,0x016FA800U,0x014FB000U,0x010FC000U,0x00EFD000U,0x00AFD800U,0x006FE800U,0x004FF000U,0x00100000U,0xFFD01000U,0xFFB01800U,0xFF702800U,0xFF303000U,0xFF104000U,0xFED05000U,0xFEB05800U,0xFE706800U,0xFE307000U,0xFE108000U,0xFDD09000U,0xFD909800U,0xFD70A800U,0xFD30B000U,0xFD10C000U,0xFCD0D000U,0xFC90D800U,0xFC70E800U,0xFC30F000U,0xFBF10000U,0xFBD11000U,0xFB911800U,0xFB712800U,0xFB313000U,0xFAF14000U,0xFAD14800U,0xFA915800U,0xFA516800U,0xFA317000U,0xF9F18000U,0xF9D18800U,0xF9919800U,0xF951A800U,0xF931B000U,0xF8F1C000U,0xF8B1C800U,0xF891D800U,0xF851E800U,0xF831F000U,0xF7F20000U,0xF7B20800U,0xF7921800U,0xF7522800U,0xF7123000U,0xF6F24000U,0xF6B24800U,0xF6925800U,0xF6526800U,0xF6127000U,0xF5F28000U,0xF5B28800U,0xF5729800U,0xF552A800U,0xF512B000U,0xF4F2C000U,0xF4B2C800U,0xF472D800U,0xF452E800U,0xF412F000U,0xF3D30000U,0xF3B30800U,0xF3731800U,0xF3532800U,0xF3133000U,0xF2D34000U,0xF2B34800U,0xF2735800U,0xF2336800U,0xF2137000U,0xF1D38000U,0xF1B38800U,0xF1739800U,0xF133A800U,0xF113B000U,0xF0D3C000U,0xF093C800U,0xF073D800U,0xF033E000U,0xF013F000U,0xEFD40000U,0xEF940800U,0xEF741800U,0xEF342000U,0xEEF43000U,0xEED44000U,0xEE944800U,0xEE745800U,0xEE346000U,0xEDF47000U,0xEDD48000U,0xED948800U,0xED549800U,0xED34A000U,0xECF4B000U,0xECD4C000U,0xEC94C800U,0xEC54D800U,0xEC34E000U,0xEBF4F000U,0xEBB50000U,0xEB950800U,0xEB551800U,0xEB352000U,0xEAF53000U,0xEAB54000U,0xEA954800U,0xEA555800U,0xEA156000U,0xE9F57000U,0xE9B58000U,0xE9958800U,0xE9559800U,0xE915A000U,0xE8F5B000U,0xE8B5C000U,0xE875C800U,0xE855D800U,0xE815E000U,0xE7F5F000U,0xE7B60000U,0xE7760800U,0xE7561800U,0xE7162000U,0xE6D63000U,0xE6B64000U,0xE6764800U,0xE6365800U
};

本文出自 “大师兄” 博客，请务必保留此出处http://cto521.blog.51cto.com/9652841/1584654

转载于:https://www.cnblogs.com/HuangWj/p/5502881.html

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