BlurImage | android 高斯模糊效果 | Android library

I'm trying to write a basic firebase function which blurs images. The code is based mainly on the firebase function samples:

I want to apply a blur effect on the background image in my app. I tried a lot of solutions and tricks available on the net, but they are only blurring out the whole image, but my requirement is to blur the from only left and bottom, is there any technique for doing this. Any help will be highly appreciated.

I am trying to come up with a way to perform a live blur during AVVideoCompositionCoreAnimationTool export. I have tried UIVisualEffectView and stealing the layer of the underlying view. It works in preview but as soon as you use it inside AVVideoCompositionCoreAnimationTool the layer is black. So I started building a CALayer that does this but it is not updating often enough. What can I do to make it draw more often or what might work for using the AVVideoCompositionCoreAnimationTool and a live blur in iOS? Here is the layer I built.

I'm working on android app, which determines which font is used on a text image. So I need to extract every character from image and don't know how to do it precisely. Furthermore, when I'm trying to process an image I have one result...but my classmate has different (for example, more or less noise). The problem with character detection is that:

1) it detects also some noise blobs on image and shows it in rectangles (I thought about detectMultiScale... but I have doubts about it, maybe there are easiest ways to detect characters)

2) it detects several contours of one character (for example inner and outer radius of letter "o")

And question for the future: I'm going to create a DB with images (for now just 3 fonts) of different letters of fonts and compare them with an image of letters from photo. Maybe someone could recommend a better way to do it.
So this is part of code with image processing(I'm still playing with values of blur, threshold and Canny... but there was no really positive result):

I add this dependence in build.gradle to blur my imageView :

I'm creating a GUI that shows buttons according to a selected image characteristics. Let's say image A has the characteristics 1, 2 and 3, so when selected buttons that implements filters for the characteristics 1, 2 and 3 are added to my pannel.

I want the filters to be methods that can be added easily to the code, so I'm using reflection to work with the characteristics in order to get the corret methods for each image.

When a button is added to the GUI it needs a action listener, and in the action listener its method is invoked.

If there are parameters for the filter method a set of textfields is added to the GUI too in order to be posible to collect the parameters.

When the method has no params the invoke is working just fine, the addition of textfields is fine too as well as the capture of the parameters via those TFs.

The question is: using a list of unknown size is it possible to use this list as arguments for the reflection invoke?

Image 1 shows the GUI with no image selected, when a image is selected the buttons are added and the GUI will look like 2.

I'm trying to get a sample for the use of the Google Vision API within Firebase Cloud Functions to work but it fails.

I'm using the unmodified sample provided on Github: https://github.com/firebase/functions-samples/tree/master/moderate-images

EDIT:

Here is my source file: