<!--
{
  "availability" : [
    "iOS: 16.0.0 - 18.0.0",
    "iPadOS: 16.0.0 - 18.0.0",
    "macCatalyst: 16.0.0 - 18.0.0",
    "macOS: 13.0.0 - 15.0.0",
    "tvOS: 16.0.0 - 18.0.0",
    "visionOS: 1.0.0 - 2.0.0",
    "watchOS: 9.0.0 - 11.0.0"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/BNNSCropResizeBackward(_:_:_:_:_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Function",
  "symbol" : {
    "kind" : "Function",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "c:@F@BNNSCropResizeBackward"
  },
  "title" : "BNNSCropResizeBackward(_:_:_:_:_:)"
}
-->

# BNNSCropResizeBackward(_:_:_:_:_:)

Applies a crop-resize filter backward to generate gradients.

```
func BNNSCropResizeBackward(_ layer_params: UnsafePointer<BNNSLayerParametersCropResize>, _ in_delta: UnsafeMutablePointer<BNNSNDArrayDescriptor>, _ roi: UnsafePointer<BNNSNDArrayDescriptor>, _ out_delta: UnsafePointer<BNNSNDArrayDescriptor>, _ filter_params: UnsafePointer<BNNSFilterParameters>?) -> Int32
```

## Parameters

`layer_params`

A pointer to the layer parameters.

`in_delta`

A pointer to the input delta descriptor.

`roi`

A pointer to the regions of interest array descriptor.

`out_delta`

A pointer to the output delta descriptor.

`filter_params`

Runtime filter parameters.

## Discussion

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)