我在ios开发中使用核心图像框架来查找图像像素的颜色,我正在使用以下代码
CGImageRef imgSource = self.ImageView.image.CGImage;
CFDataRef m_DataRed1 = CGDataProviderCopyData(CGImageGetDataProvider(imgSource));
UInt8 *dataOrignal = (UInt8 *)CFDataGetBytePtr(m_DataRed1);
double lenghtSource = CFDataGetLength(m_DataRed1);
NSLog(@"lenght : %f",lenghtSource);
int redPixel;
int greenPixel;
int bluePixel;
for (int index=0 ; index<lenghtSource; index+=4) {
if (dataOrignal[index+1] ==236 || dataOrignal[index+2]==236 || dataOrignal[index+3]==236) {
dataOrignal[index + 1] = 205;
dataOrignal[index +2] = 25;
dataOrignal[index+3]= 55;
NSLog(@"this the value of red channel %d", index);
}
}
NSUInteger width = CGImageGetWidth(imgSource); //202
NSUInteger height = CGImageGetHeight(imgSource);//173
size_t bitsPerComponent = CGImageGetBitsPerComponent(imgSource);
size_t bitsPerPixel = CGImageGetBitsPerPixel(imgSource);
size_t bytesPerRow = CGImageGetBytesPerRow(imgSource);
NSLog(@"the width = %u and height=%u of the image is ",width,height );
NSLog(@"the bits per component is %zd", bitsPerComponent);
NSLog(@"the bits per pixel is %zd", bitsPerPixel);
NSLog(@"the bytes per row is %zd" , bytesPerRow);
CGColorSpaceRef colorspace = CGImageGetColorSpace(imgSource);
CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imgSource);
CFDataRef newData = CFDataCreate(NULL, dataOrignal, lenghtSource);
CGDataProviderRef provider = CGDataProviderCreateWithCFData(newData);
CGContextRef context = CGBitmapContextCreate(newData, width, height, bitsPerComponent, bytesPerRow, colorspace, bitmapInfo);
CGPoint point = CGContextGetTextPosition(context);
NSInteger xx = point.x;
point.y;
NSLog(@"this is the value of x axis %d",xx);
CGImageRef newImg = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, true, kCGRenderingIntentDefault);
UIImage *newImage1 = [UIImage imageWithCGImage:newImg];
self.ImageView.image = newImage1;
但现在我想要的是像素的x和y轴,所以有人可以帮帮我吗?或者任何人都有这个代码吗?请注意,我没有使用opencv,如果您知道opencv,请完整指导
答案 0 :(得分:0)
我希望这就是你要找的东西。
我将函数调用的宽度和高度移动到for循环之上,这样它们就可以在for循环中用于x和y坐标计算。此外,您可能一直在为红色通道打印错误的值。我在适当的版本中添加了对你的CG对象的调用。我不知道你是否必须发布CF对象。
CGImageRef imgSource = self.ImageView.image.CGImage;
CFDataRef m_DataRed1 = CGDataProviderCopyData(CGImageGetDataProvider(imgSource));
UInt8 *dataOrignal = (UInt8 *)CFDataGetBytePtr(m_DataRed1);
double lenghtSource = CFDataGetLength(m_DataRed1);
NSLog(@"lenght : %f",lenghtSource);
int redPixel;
int greenPixel;
int bluePixel;
int triggeredIndex = 0;
NSUInteger width = CGImageGetWidth(imgSource); //202
NSUInteger height = CGImageGetHeight(imgSource);//173
for (int index=0 ; index<lenghtSource; index+=4)
{
if (dataOrignal[index+1] ==236 || dataOrignal[index+2]==236 || dataOrignal[index+3]==236)
{
dataOrignal[index+1] = 205;
dataOrignal[index+2] = 25;
dataOrignal[index+3] = 55;
int xcoord = index / (int)(4*width); //Don't think the casts are necessary, but just in case...
int ycoord = index % (int)(4*width);
//use xcoord and ycoord here...
//NSLog(@"this the value of red channel %d", index);
//did you mean this?
NSLog(@"this the value of red channel %d", dataOrginal[index]);
}
}
//moved width and height to before the loop
size_t bitsPerComponent = CGImageGetBitsPerComponent(imgSource);
size_t bitsPerPixel = CGImageGetBitsPerPixel(imgSource);
size_t bytesPerRow = CGImageGetBytesPerRow(imgSource);
NSLog(@"the width = %u and height=%u of the image is ",width,height );
NSLog(@"the bits per component is %zd", bitsPerComponent);
NSLog(@"the bits per pixel is %zd", bitsPerPixel);
NSLog(@"the bytes per row is %zd" , bytesPerRow);
CGColorSpaceRef colorspace = CGImageGetColorSpace(imgSource);
CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imgSource);
CFDataRef newData = CFDataCreate(NULL, dataOrignal, lenghtSource);
CGDataProviderRef provider = CGDataProviderCreateWithCFData(newData);
CGContextRef context = CGBitmapContextCreate(newData, width, height, bitsPerComponent, bytesPerRow, colorspace, bitmapInfo);
CGPoint point = CGContextGetTextPosition(context);
NSInteger xx = point.x;
point.y; //this is unnecessary and does nothing
NSLog(@"this is the value of x axis %d",xx);
CGImageRef newImg = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorspace, bitmapInfo, provider, NULL, true, kCGRenderingIntentDefault);
UIImage *newImage1 = [UIImage imageWithCGImage:newImg];
self.ImageView.image = newImage1;
//always remember to clean up after yourself!
CGImageRelease(imgSource);
CGColorSpaceRelease(colorspace);
CGDataProviderRelease(provider);
CGContextRelease(context);
CGImageRelease(newImg);
请记住,不要忘记释放你的CG对象!