image processing - How to apply filter on uiimage in ios to remove shadow and lights? -


i wants apply on filter uiimage in ios remove shadow , lights. have below android code it. needs equivalent in ios. 

public static bitmap changebitmapcontrastbrightness(bitmap bmp, float contrast, float brightness) { colormatrix cm = new colormatrix(new float[]         {             contrast, 0, 0, 0, brightness,             0, contrast, 0, 0, brightness,             0, 0, contrast, 0, brightness,             0, 0, 0, 1, 0         });  bitmap ret = bitmap.createbitmap(bmp.getwidth(), bmp.getheight(), bmp.getconfig());  canvas canvas = new canvas(ret);  paint paint = new paint(); paint.setcolorfilter(new colormatrixcolorfilter(cm)); canvas.drawbitmap(bmp, 0, 0, paint);  return ret; }

i have used below ios code can't proper result

ciimage *inputimage = [ciimage imagewithcgimage:[uiimage   imagenamed:@"facedetectionpic.jpg"].cgimage]; // 1 // make filter cifilter *colormatrixfilter = [cifilter filterwithname:@"cicolormatrix"]; // 2 [colormatrixfilter setdefaults]; // 3 [colormatrixfilter setvalue:inputimage forkey:kciinputimagekey]; // 4 [colormatrixfilter setvalue:[civector vectorwithx:1 y:1 z:1 w:0] forkey:@"inputrvector"]; // 5 [colormatrixfilter setvalue:[civector vectorwithx:0 y:1 z:0 w:0] forkey:@"inputgvector"]; // 6 [colormatrixfilter setvalue:[civector vectorwithx:0 y:0 z:1 w:0] forkey:@"inputbvector"]; // 7 [colormatrixfilter setvalue:[civector vectorwithx:0 y:0 z:0 w:1] forkey:@"inputavector"]; // 8  // output image recipe ciimage *outputimage = [colormatrixfilter outputimage];  // 9  // create context , instruct coreimage draw output image recipe cgimage cicontext *context = [cicontext contextwithoptions:nil]; cgimageref cgimg = [context createcgimage:outputimage fromrect:[outputimage extent]]; // 10

this data filtration .this logic use in code image filtration remove shadow or brightness

  if ([categorytitle isequaltostring:@"category"])          {              iscategory=no;          }          else          {           categorydata=[[nsmutablearray alloc]init];          (int a=0; a<fetcheddataarray.count; a++)          {              categorydictionary=[[nsmutabledictionary alloc]init];              categorydictionary=[fetcheddataarray objectatindex:a];              nsstring *categ=[[[[[categorydictionary objectforkey:@"terms"] objectforkey:@"offershop"] objectatindex:0] objectforkey:@"parent"] objectforkey:@"name"];              if ([categorytitle isequaltostring:categ])              {                  [categorydata addobject:categorydictionary];              }              //searchdictionary=nil;          }          nslog(@"done");          }          [self.tableview reloaddata];       }

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