How Can I Achieve Fast Bitmap Blurring in Android Using the Stack Blur Algorithm?

Fast Bitmap Blur for Android SDK

Blurring images can be a time-consuming task, especially when dealing with large images. The traditional method of looping through each pixel can take several seconds for high-resolution images.

Faster Blurring Algorithm

Fortunately, there are faster algorithms available for blurring images. One such algorithm is the "Stack Blur" algorithm, which offers a compromise between Gaussian blur and box blur. It provides visually pleasing results while being significantly faster than traditional Gaussian blur implementations.

Implementing the Stack Blur Algorithm

The Java code provided above implements the Stack Blur algorithm for Android. Here's how it works:

• It starts by resizing the input bitmap to a smaller resolution for faster processing.
• An array of pixels is extracted from the resized bitmap.
• The algorithm then stacks colors from the pixels horizontally and vertically.
• It calculates the average color and blur each color in the stack.
• Once the horizontal stack has been blurred, the process is repeated vertically to create the final blurred image.

Performance and Usage

The Stack Blur algorithm is approximately 7x faster than traditional Gaussian blur implementations. It's recommended to use this algorithm when you need to blur images quickly and efficiently.

To use the Stack Blur algorithm, you can call the fastblur method provided in the code snippet. It takes the input bitmap, a scale factor to control the blur radius, and the desired blur radius as arguments. The method returns the blurred bitmap.

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