ios - GPUImage show histogram in another view -

i trying display histogram using gpuimage. have following code:

gpuimageoutput<gpuimageinput> *filter = [[gpuimagehistogramfilter alloc] initwithhistogramtype:kgpuimagehistogramluminance]; [self.stillcamera  removetarget:filter]; gpuimagegammafilter *gammafilter = [[gpuimagegammafilter alloc] init]; [self.stillcamera  addtarget:gammafilter]; [gammafilter addtarget:filter];  gpuimagehistogramgenerator *histogramgraph = [[gpuimagehistogramgenerator alloc] init];  [histogramgraph forceprocessingatsize:cgsizemake(500.0, 500)]; [filter addtarget:histogramgraph];  gpuimagealphablendfilter *blendfilter = [[gpuimagealphablendfilter alloc] init]; blendfilter.mix = 0.75; [blendfilter forceprocessingatsize:cgsizemake(500, 500)];  [self.stillcamera addtarget:blendfilter]; [histogramgraph addtarget:blendfilter];  [blendfilter addtarget:previewview]; 

above shows histogram overplayed on previewview. (it flicker however, issue, day)

i want show histogram on smaller view in particular location on view. how can this?

to show histogram in separate view need add gpuimageview main view , point histogram filter it. here source code based on simpleimagefilter sample.

- (void)loadview {         cgrect mainscreenframe = [[uiscreen mainscreen] applicationframe];      gpuimageview *primaryview = [[gpuimageview alloc] initwithframe:mainscreenframe];     self.view = primaryview;      uiimage *inputimage = [uiimage imagenamed:@"wid-small.jpg"];     gpuimagepicture *sourcepicture = [[gpuimagepicture alloc] initwithimage:inputimage smoothlyscaleoutput:yes];      // creating view show histogram     gpuimageview *histview = [[gpuimageview alloc] initwithframe:cgrectmake(mainscreenframe.size.width - 100, mainscreenframe.size.height - 100, 100, 100)];     [primaryview addsubview:histview];      // create histogram filter , generator , point histogram view     gpuimageoutput<gpuimageinput> *histfilter = [[gpuimagehistogramfilter alloc] initwithhistogramtype:kgpuimagehistogramluminance];     gpuimageoutput<gpuimageinput> *histgenerator = [[gpuimagehistogramgenerator alloc] init];     [histgenerator forceprocessingatsize:histview.sizeinpixels];     [sourcepicture addtarget:histfilter];     [histfilter addtarget:histgenerator];     // note target - hist view     [histgenerator addtarget:histview];      // setup sepia filter show main picture     gpuimageoutput<gpuimageinput> *sepiafilter = [[gpuimagesepiafilter alloc] init];     [sepiafilter forceprocessingatsize:primaryview.sizeinpixels];     [sourcepicture addtarget:sepiafilter];     // note target - main view     [sepiafilter addtarget:primaryview];      [sourcepicture processimage]; } 

and final result: