UIImage转BitMap并获取点阵数据

2018-11-12 04:14:05 815 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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如题,请教UIImage如何转成位图，并获取对应的点阵数据？

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qq_35206032 2019-09-02

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引用 1 楼 dirdirdir3 的回复:

- (Byte *) getByteDataWithImage:(UIImage *)image {

BOOL pol = self.dataPolarIndex == 1;

NSInteger bit = 0 ;

NSInteger addLeft = 0;

NSInteger picWidth = image.size.width,picHeight = image.size.height;

// NSLog(@"图片款高---%ld----%ld",picWidth,picHeight);

NSInteger shiftBit = 0;

Byte r;

Byte g;

Byte b;

NSMutableData *lastData = [[NSMutableData alloc]init];

Byte *lastByte;

NSInteger x = _subtitleX;

if (effectsRow2 == 1 || effectsRow2 == 2) {

addLeft = 0;

}else{

addLeft = x % 8;

}

unsigned char *pixels = calloc(picWidth * picHeight * 4, sizeof(unsigned char)); // 取图片首地址//准备用来存储数据的数组

size_t bitsPerComponent = 8; // 每个像素元素位数为 8 bit，即 rgba 每位各 1 个字节

size_t bytesPerRow = picWidth *4; //一个像素 4 个字节，则一行共 4 * width 个字节

CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB(); // 创建rgb颜色空间这决定了输出颜色的编码是 RGB 还是其他（比如 YUV）

CGContextRef context =

CGBitmapContextCreate(pixels,

picWidth,

picHeight,

bitsPerComponent,

bytesPerRow,

space,

kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);

CGContextDrawImage(context, CGRectMake(0, 0, picWidth, picHeight), image.CGImage);//将图片的数据写入上下文

CGColorSpaceRelease(space);

CGContextRelease(context);

NSInteger rgbSpace = ((picWidth + addLeft + 7)/8) * picHeight;

NSInteger grayLevel = 0;

if ([[NSUserDefaults standardUserDefaults]integerForKey:@"selectGLRow"]) {

grayLevel = [[NSUserDefaults standardUserDefaults]integerForKey:@"selectGLRow"];

}else {

grayLevel = 1;

}

for (NSInteger gray = 1; gray <= grayLevel; gray ++) {

bit = 7 - (grayLevel - gray);

unsigned char *rBytes = malloc(rgbSpace);

unsigned char *gBytes = malloc(rgbSpace);

unsigned char *bBytes = malloc(rgbSpace);

NSInteger rgbStep = 0;

for (NSInteger i = 0; i < picHeight; i ++) {

r = 0;

g = 0;

b = 0;

shiftBit = 8 - addLeft;

for (NSInteger j = 0; j < picWidth; j ++) {

r |= (((pixels[i*picWidth *4 +j*4 + 0] >> bit)&0x01) << (shiftBit -1));

g |= (((pixels[i*picWidth *4 +j*4 + 1] >> bit)&0x01) << (shiftBit -1));

b |= (((pixels[i*picWidth *4 +j*4 + 2] >> bit)&0x01) << (shiftBit -1));

shiftBit --;

if (shiftBit == 0 || (j==picWidth -1)) {

if (!pol) {

r = ~r;

g = ~g;

b = ~b;

}

rBytes[rgbStep] = r;

gBytes[rgbStep] = g;

bBytes[rgbStep] = b;

rgbStep++;

shiftBit = 8;

r = 0;

g = 0;

b = 0;

}

}

}

switch (self.colorIndex) {

case 0:

[lastData appendBytes:rBytes length:rgbSpace];

break;

case 1:

switch (self.RGBOrder) {

case 0:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 1:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

}

break;

case 2:

switch (self.RGBOrder) {

case 2:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

case 3:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 4:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

case 5:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

case 6:

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 7:

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

}

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

break;

}

free(rBytes);

free(gBytes);

free(bBytes);

rBytes = NULL;

bBytes = NULL;

bBytes = NULL;

}

free(pixels);

pixels = NULL;

[[NSUserDefaults standardUserDefaults] setInteger:lastData.length forKey:@"subTitleDataLength"];

[[NSUserDefaults standardUserDefaults] synchronize];

lastByte = (Byte *)[lastData bytes];

return lastByte;

}

方法里面有些参数貌似是全局的，请问有完整的代码吗？或者demo

dirdirdir3 2018-11-26

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- (Byte *) getByteDataWithImage:(UIImage *)image {

BOOL pol = self.dataPolarIndex == 1;

NSInteger bit = 0 ;

NSInteger addLeft = 0;

NSInteger picWidth = image.size.width,picHeight = image.size.height;

// NSLog(@"图片款高---%ld----%ld",picWidth,picHeight);

NSInteger shiftBit = 0;

Byte r;

Byte g;

Byte b;

NSMutableData *lastData = [[NSMutableData alloc]init];

Byte *lastByte;

NSInteger x = _subtitleX;

if (effectsRow2 == 1 || effectsRow2 == 2) {

addLeft = 0;

}else{

addLeft = x % 8;

}

unsigned char *pixels = calloc(picWidth * picHeight * 4, sizeof(unsigned char)); // 取图片首地址//准备用来存储数据的数组

size_t bitsPerComponent = 8; // 每个像素元素位数为 8 bit，即 rgba 每位各 1 个字节

size_t bytesPerRow = picWidth *4; //一个像素 4 个字节，则一行共 4 * width 个字节

CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB(); // 创建rgb颜色空间这决定了输出颜色的编码是 RGB 还是其他（比如 YUV）

CGContextRef context =

CGBitmapContextCreate(pixels,

picWidth,

picHeight,

bitsPerComponent,

bytesPerRow,

space,

kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);

CGContextDrawImage(context, CGRectMake(0, 0, picWidth, picHeight), image.CGImage);//将图片的数据写入上下文

CGColorSpaceRelease(space);

CGContextRelease(context);

NSInteger rgbSpace = ((picWidth + addLeft + 7)/8) * picHeight;

NSInteger grayLevel = 0;

if ([[NSUserDefaults standardUserDefaults]integerForKey:@"selectGLRow"]) {

grayLevel = [[NSUserDefaults standardUserDefaults]integerForKey:@"selectGLRow"];

}else {

grayLevel = 1;

}

for (NSInteger gray = 1; gray <= grayLevel; gray ++) {

bit = 7 - (grayLevel - gray);

unsigned char *rBytes = malloc(rgbSpace);

unsigned char *gBytes = malloc(rgbSpace);

unsigned char *bBytes = malloc(rgbSpace);

NSInteger rgbStep = 0;

for (NSInteger i = 0; i < picHeight; i ++) {

r = 0;

g = 0;

b = 0;

shiftBit = 8 - addLeft;

for (NSInteger j = 0; j < picWidth; j ++) {

r |= (((pixels[i*picWidth *4 +j*4 + 0] >> bit)&0x01) << (shiftBit -1));

g |= (((pixels[i*picWidth *4 +j*4 + 1] >> bit)&0x01) << (shiftBit -1));

b |= (((pixels[i*picWidth *4 +j*4 + 2] >> bit)&0x01) << (shiftBit -1));

shiftBit --;

if (shiftBit == 0 || (j==picWidth -1)) {

if (!pol) {

r = ~r;

g = ~g;

b = ~b;

}

rBytes[rgbStep] = r;

gBytes[rgbStep] = g;

bBytes[rgbStep] = b;

rgbStep++;

shiftBit = 8;

r = 0;

g = 0;

b = 0;

}

}

}

switch (self.colorIndex) {

case 0:

[lastData appendBytes:rBytes length:rgbSpace];

break;

case 1:

switch (self.RGBOrder) {

case 0:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 1:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

}

break;

case 2:

switch (self.RGBOrder) {

case 2:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

case 3:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 4:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

case 5:

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

case 6:

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

break;

case 7:

[lastData appendBytes:bBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:rBytes length:rgbSpace];

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

[lastData appendBytes:gBytes length:rgbSpace];

[lastData appendBytes:bBytes length:rgbSpace];

break;

}

break;

default:

[lastData appendBytes:rBytes length:rgbSpace];

break;

}

free(rBytes);

free(gBytes);

free(bBytes);

rBytes = NULL;

bBytes = NULL;

bBytes = NULL;

}

free(pixels);

pixels = NULL;

[[NSUserDefaults standardUserDefaults] setInteger:lastData.length forKey:@"subTitleDataLength"];

[[NSUserDefaults standardUserDefaults] synchronize];

lastByte = (Byte *)[lastData bytes];

return lastByte;

}

UIImage转BitMap并获取点阵数据

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