Memory leaks when use filters

[oleksandrtry]

After the execution of the code, I have the memory usage increases. How can I free up memory after execution?

My Code:

`

   let contrastfilter = GPUImageContrastFilter()
    contrastfilter.contrast = 1.4

    let thresholdImageFilter = GPUImageAdaptiveThresholdFilter()
    thresholdImageFilter.blurRadiusInPixels = 16.0

    let filterGroup = GPUImageFilterGroup()
    filterGroup.addFilter(contrastfilter)
    filterGroup.addFilter(thresholdImageFilter)
    contrastfilter.addTarget(thresholdImageFilter)

    filterGroup.initialFilters = [ contrastfilter ]
    filterGroup.terminalFilter = thresholdImageFilter

    let resultImage = filterGroup.image(byFilteringImage: image)

`

[bianzhifeng]

OC: [[GPUImageContext sharedImageProcessingContext].framebufferCache purgeAllUnassignedFramebuffers];

[oleksandrtry]

I try to use this, but no effect. In what place I should write this?

[bianzhifeng]

After the effect image is displayed in the view

[bianzhifeng]

Or when the view is dealloc

[oleksandrtry]

I didn't show images. After filter processing I save images to file system.

[oleksandrtry]

The problem is reproduced only when I save the image in the file system. Can anyone help to solve this problem?