---
title: previousFrames
framework: videotoolbox
role: symbol
role_heading: Instance Property
path: videotoolbox/vttemporalnoisefilterparameters/previousframes
---

# previousFrames

Past reference frames in presentation time order that you use to process the source frame.

## Declaration

```swift
var previousFrames: [VTFrameProcessorFrame] { get }
```

## Discussion

Discussion The number of frames can vary from 0 to the number specified by the previousFrameCount property in VTTemporalNoiseFilterConfiguration.

## See Also

### Inspecting the parameters

- [sourceFrame](videotoolbox/vttemporalnoisefilterparameters/sourceframe.md)
- [nextFrames](videotoolbox/vttemporalnoisefilterparameters/nextframes.md)
- [filterStrength](videotoolbox/vttemporalnoisefilterparameters/filterstrength.md)
- [hasDiscontinuity](videotoolbox/vttemporalnoisefilterparameters/hasdiscontinuity.md)