---
title: kernelDiameter
framework: metalperformanceshaders
role: symbol
role_heading: Instance Property
path: metalperformanceshaders/mpsimagemedian/kerneldiameter
---

# kernelDiameter

The diameter, in pixels, of the filter window.

## Declaration

```swift
var kernelDiameter: Int { get }
```

## Discussion

Discussion The median filter is applied to a kernelDiameter * kernelDiameter window of pixels centered on the corresponding source pixel for each destination pixel.  The kernel diameter must be an odd number.