The realization method of IOS image Blur effect _ios

This article for everyone to share the iOS image blur effect of three ways to achieve, for your reference, the specific content as follows

1. Realize the effect in order as follows: Original picture, iOS8 effect, Core image effect, vimage effect

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2. Code

#import "ViewController.h" #import <Accelerate/Accelerate.h> @interface Viewcontroller () @end @implement 
 ation Viewcontroller-(void) viewdidload {[Super viewdidload]; 
  
Self.view.backgroundColor = [Uicolor colorwithpatternimage:[uiimage imagenamed:@ "background"]]; 
[Self ios8blurimageimplement]; 
 [Self coreimageimplement]; 
[Self vimageimplement]; }//IOS8 using the system's own processing Method-(void) ios8blurimageimplement {uiblureffect *beffect = [Uiblureffect effectwithstyle:uiblure 
 Ffectstylelight]; 
 Uivisualeffectview *view = [[Uivisualeffectview alloc] initwitheffect:beffect]; 
 View.frame = Self.view.bounds; 
[Self.view Addsubview:view]; 
  
 ///Use Coreimage to implement picture Blur-(void) coreimageimplement{cicontext *context = [Cicontext Contextwithoptions:nil]; 
 Nserror *error = nil; 
 NSString *filepath = [[NSBundle mainbundle] pathforresource:@ "background" oftype:@ "PNG"]; NSData *imagedata = [NSData datawithcontentsoffile:filepath options:nsdatareadinguncached Error:&error]; 
 NSData *imagedata = [NSData datawithcontentsoffile:@ "Background.png"]; 
 Ciimage *image = [Ciimage imagewithdata:imagedata]; 
 Cifilter *filter = [Cifilter filterwithname:@ "Cigaussianblur"]; 
 [Filter Setvalue:image Forkey:kciinputimagekey]; 
 [Filter setvalue:@2.0f forkey:@ "Inputradius"]; 
 Ciimage *result = [Filter Valueforkey:kcioutputimagekey]; 
 Cgimageref outimage = [Context Createcgimage:result fromrect:[result extent]]; 
  
 UIImage *bluerimage = [UIImage imagewithcgimage:outimage]; 
 Uiimageview *imageview = [[Uiimageview alloc] initwithimage:bluerimage]; 
 Imageview.frame = Self.view.bounds; 
[Self.view Addsubview:imageview]; ///using Vimage API to implement picture blur//iOS5.0 added Vimage API can be used, it belongs to Accelerate.framework, so if you want to use it to incorporate this Framework into the project. 
The fuzzy algorithm uses the vimageboxconvolve_argb8888 function. 
 -(void) vimageimplement {uiimage *image = [uiimage imagenamed:@ "background"]; 
 UIImage *blurimage = [self blurryimage:image withblurlevel:0.5]; Self.view.backgroundColor =[Uicolor Colorwithpatternimage:blurimage]; }-(UIImage *) Blurryimage: (UIImage *) image withblurlevel: (CGFloat) Blur {if (Blur < 0.F | | Blur > 1.F) {bl 
 ur = 0.5f; 
 int boxsize = (int) (blur * 100); 
  
 Boxsize = boxsize-(boxsize% 2) + 1; Cgimageref img = image. 
  
 Cgimage; 
 Vimage_buffer Inbuffer, Outbuffer; 
  
 Vimage_error Error; 
  
 Voidvoid *pixelbuffer; 
 Cgdataproviderref inprovider = Cgimagegetdataprovider (IMG); 
  
 Cfdataref inbitmapdata = Cgdataprovidercopydata (Inprovider); 
 Inbuffer.width = Cgimagegetwidth (IMG); 
 Inbuffer.height = Cgimagegetheight (IMG); 
  
 inbuffer.rowbytes = Cgimagegetbytesperrow (IMG); 
  
 Inbuffer.data = (void*) cfdatagetbyteptr (inbitmapdata); 
  
 Pixelbuffer = malloc (Cgimagegetbytesperrow (IMG) * Cgimagegetheight (IMG)); 
  
 if (Pixelbuffer = NULL) NSLog (@ "No pixelbuffer"); 
 Outbuffer.data = Pixelbuffer; 
 Outbuffer.width = Cgimagegetwidth (IMG); 
 Outbuffer.height = Cgimagegetheight (IMG); Outbuffer.rowbytes = CGImagegetbytesperrow (IMG); 
          Error = vimageboxconvolve_argb8888 (&inbuffer, &outbuffer, NULL, 0, 0, 
  
  
 Boxsize, Boxsize, NULL, kvimageedgeextend); 
 if (Error) {NSLog (@ "error from convolution%ld", error); 
 } cgcolorspaceref ColorSpace = Cgcolorspacecreatedevicergb (); Cgcontextref CTX = cgbitmapcontextcreate (Outbuffer.data, Outbuffer.width, Outbuffe R.height, 8, Outbuffer.rowbytes, ColorSpace, Kcgimagealphanoneskiplast 
 ); 
 Cgimageref imageref = Cgbitmapcontextcreateimage (CTX); 
  
 UIImage *returnimage = [UIImage imagewithcgimage:imageref]; 
 Clean up cgcontextrelease (CTX); 
  
 Cgcolorspacerelease (ColorSpace); 
 Free (pixelbuffer); 
  
 Cfrelease (Inbitmapdata); 
 Cgcolorspacerelease (ColorSpace); 
  
 Cgimagerelease (IMAGEREF); 
return returnimage;  } @end

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