Blur image Processing

A.

Blur using the Vimage API

The new Vimage API is available in iOS5.0, which belongs to Accelerate.framework, so if you want to use it, you need to add the Framework to the project. The fuzzy algorithm uses the vimageboxconvolve_argb8888 function.

1-(UIImage *) Blurredimagewithradius: (cgfloat) Radius iterations: (nsuinteger) iterations Tintcolor: (Uicolor *) Tintcolor2 3 {4 5 //image must be nonzero size6 7 if(Floorf (self.size.width) * Floorf (self.size.height) <=0.0f)returnSelf ;8 9 //Boxsize must is an odd integerTen  Oneuint32_t boxsize = (uint32_t) (RADIUS *Self.scale); A  - if(Boxsize%2==0) Boxsize + +; -  the //Create image Buffers -  -Cgimageref Imageref =Self . Cgimage; -  + Vimage_buffer buffer1, buffer2; -  +Buffer1.width = Buffer2.width =cgimagegetwidth (imageref); A  atBuffer1.height = Buffer2.height =cgimagegetheight (imageref); -  -Buffer1.rowbytes = Buffer2.rowbytes =Cgimagegetbytesperrow (imageref); -  -size_t bytes = Buffer1.rowbytes *Buffer1.height; -  inBuffer1.data =malloc (bytes); -  toBuffer2.data =malloc (bytes); +  - //Create temp buffer the  * void*tempbuffer = malloc ((size_t) vimageboxconvolve_argb8888 (&buffer1, &buffer2, NULL,0,0, Boxsize, Boxsize, $ Panax NotoginsengNULL, Kvimageedgeextend +kvimagegettempbuffersize)); -  the //Copy Image Data +  ACfdataref DataSource =Cgdataprovidercopydata (Cgimagegetdataprovider (Imageref)); the  + memcpy (Buffer1.data, Cfdatagetbyteptr (dataSource), bytes); -  $ cfrelease (dataSource); $  -  for(Nsuinteger i =0; I < iterations; i++) -  the { - Wuyi //perform Blur the  -vimageboxconvolve_argb8888 (&buffer1, &buffer2, Tempbuffer,0,0, Boxsize, Boxsize, NULL, kvimageedgeextend); Wu  - //Swap buffers About  $ void*temp =Buffer1.data; -  -Buffer1.data =Buffer2.data; -  ABuffer2.data =temp; +  the } -  $ //Free buffers the  the Free (buffer2.data); the  the Free (tempbuffer); -  in //Create image context from buffer the  theCgcontextref CTX =cgbitmapcontextcreate (Buffer1.data, Buffer1.width, Buffer1.height, About  the 8, Buffer1.rowbytes, Cgimagegetcolorspace (imageref), the  the Cgimagegetbitmapinfo (Imageref)); +  - //Apply Tint the Bayi if(Tintcolor && Cgcolorgetalpha (Tintcolor.cgcolor) >0.0f) the  the { -  -Cgcontextsetfillcolorwithcolor (CTX, [Tintcolor colorwithalphacomponent:0.25]. Cgcolor); the  the Cgcontextsetblendmode (CTX, kcgblendmodepluslighter); the  theCgcontextfillrect (CTX, CGRectMake (0,0, Buffer1.width, Buffer1.height)); -  the } the  the //create image from context94  theImageref =cgbitmapcontextcreateimage (CTX); the  theUIImage *image =[UIImage imagewithcgimage:imageref scale:self.scale orientation:self.imageOrientation];98  About cgimagerelease (imageref); - 101 cgcontextrelease (CTX);102 103 Free (buffer1.data);104  the returnimage;106 107}

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B.

is to use the filter effect provided by Apple in Coreimage, but this method is inefficient and needs to be converted relatively long

CPU Rendering: Slow inefficient, preferably in a sub-thread, in order to avoid thread blocking.

1-(UIImage *) blur{2 3Cicontext *context =[Cicontext Contextwithoptions:nil];4 5Ciimage *imagetoblur =[[Ciimage alloc]initwithimage:_imgview.image];6 7Cifilter *filter = [Cifilter filterwithname:@"Cigaussianblur"Keysandvalues:kciinputimagekey,imagetoblur, nil];8 9_outputciimage =[Filter outputimage];Ten  OneUIImage *img =[UIImage imagewithcgimage:[context createcgimage:_outputciimage fromrect:_outputciimage.extent]; A  - returnimg; -  the}

C.ios8 the new functionality. Especially convenient, can also support real-time blur, the disadvantage is only iOS8 above use

1 -(ibaction) Ios8bluraction: (ID) sender {  2  3 uiblureffect *beffect =  [Uiblureffect effectwithstyle:uiblureffectstyleextralight]; 4 5 Uivisualeffectview *view = [[Uivisualeffectview alloc]initwitheffect:beffect]; 6 7 view.frame = self.bounds; 8 9 [self addsubview:view]; Ten  One}

D.gpuimage

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Blur image Processing