---
library_name: pytorch
license: other
tags:
- real_time
- android
pipeline_tag: image-to-image

---

![](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/web-assets/model_demo.png)

# DnCNN: Optimized for Qualcomm Devices

DnCNN is a 17-layer denoising convolutional neural network that uses residual learning to remove Gaussian noise (sigma=25) from grayscale images. The network predicts the noise residual and subtracts it from the input to produce a clean image.

This is based on the implementation of DnCNN found [here](https://github.com/cszn/KAIR).
This repository contains pre-exported model files optimized for Qualcomm® devices. You can use the [Qualcomm® AI Hub Models](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/dncnn) library to export with custom configurations. More details on model performance across various devices, can be found [here](#performance-summary).

Qualcomm AI Hub Models uses [Qualcomm AI Hub Workbench](https://workbench.aihub.qualcomm.com) to compile, profile, and evaluate this model. [Sign up](https://myaccount.qualcomm.com/signup) to run these models on a hosted Qualcomm® device.

## Getting Started
There are two ways to deploy this model on your device:

### Option 1: Download Pre-Exported Models

Below are pre-exported model assets ready for deployment.

| Runtime | Precision | Chipset | SDK Versions | Download |
|---|---|---|---|---|
| ONNX | float | Universal | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-onnx-float.zip)
| ONNX | w8a8 | Universal | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-onnx-w8a8.zip)
| QNN_DLC | float | Universal | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-qnn_dlc-float.zip)
| QNN_DLC | w8a8 | Universal | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-qnn_dlc-w8a8.zip)
| TFLITE | float | Universal | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-tflite-float.zip)
| TFLITE | w8a8 | Universal | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/dncnn/releases/v0.53.1/dncnn-tflite-w8a8.zip)

For more device-specific assets and performance metrics, visit **[DnCNN on Qualcomm® AI Hub](https://aihub.qualcomm.com/models/dncnn)**.


### Option 2: Export with Custom Configurations

Use the [Qualcomm® AI Hub Models](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/dncnn) Python library to compile and export the model with your own:
- Custom weights (e.g., fine-tuned checkpoints)
- Custom input shapes
- Target device and runtime configurations

This option is ideal if you need to customize the model beyond the default configuration provided here.

See our repository for [DnCNN on GitHub](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/dncnn) for usage instructions.

## Model Details

**Model Type:** Model_use_case.image_editing

**Model Stats:**
- Model checkpoint: dncnn_25
- Input resolution: 256x256
- Number of parameters: 555K
- Model size (float): 2.12 MB
- Model size (w8a8): 581 KB

## Performance Summary
| Model | Runtime | Precision | Chipset | Inference Time (ms) | Peak Memory Range (MB) | Primary Compute Unit
|---|---|---|---|---|---|---
| DnCNN | ONNX | float | Snapdragon® 8 Elite Gen 5 Mobile | 3.119 ms | 0 - 142 MB | NPU
| DnCNN | ONNX | float | Snapdragon® 8 Elite Mobile | 4.139 ms | 0 - 142 MB | NPU
| DnCNN | ONNX | float | Snapdragon® X2 Elite | 4.045 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | float | Snapdragon® X Elite | 7.396 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | float | Snapdragon® X Elite | 7.396 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | float | Snapdragon® 8 Gen 3 Mobile | 5.186 ms | 1 - 181 MB | NPU
| DnCNN | ONNX | float | Qualcomm® QCS8550 (Proxy) | 6.928 ms | 7 - 9 MB | NPU
| DnCNN | ONNX | float | Qualcomm® QCS9075 | 14.572 ms | 1 - 4 MB | NPU
| DnCNN | ONNX | float | Snapdragon® 8 Elite For Galaxy Mobile | 4.139 ms | 0 - 142 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® 8 Elite Gen 5 Mobile | 0.755 ms | 0 - 33 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® 8 Elite Mobile | 1.219 ms | 0 - 34 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® X2 Elite | 1.047 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® X Elite | 2.021 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® X Elite | 2.021 ms | 0 - 0 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® 8 Gen 3 Mobile | 1.338 ms | 0 - 48 MB | NPU
| DnCNN | ONNX | w8a8 | Qualcomm® QCS6490 | 132.205 ms | 60 - 63 MB | CPU
| DnCNN | ONNX | w8a8 | Qualcomm® QCS8550 (Proxy) | 1.79 ms | 0 - 3 MB | NPU
| DnCNN | ONNX | w8a8 | Qualcomm® QCS9075 | 1.933 ms | 0 - 3 MB | NPU
| DnCNN | ONNX | w8a8 | Qualcomm® QCM6690 | 192.093 ms | 61 - 68 MB | CPU
| DnCNN | ONNX | w8a8 | Snapdragon® 8 Elite For Galaxy Mobile | 1.219 ms | 0 - 34 MB | NPU
| DnCNN | ONNX | w8a8 | Snapdragon® 7 Gen 4 Mobile | 160.759 ms | 62 - 69 MB | CPU
| DnCNN | ONNX | w8a8 | Snapdragon® 7 Gen 4 Mobile | 160.759 ms | 62 - 69 MB | CPU
| DnCNN | QNN_DLC | float | Snapdragon® 8 Elite Gen 5 Mobile | 2.962 ms | 0 - 146 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® 8 Elite Mobile | 4.029 ms | 0 - 142 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® X2 Elite | 4.144 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® X Elite | 7.2 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® X Elite | 7.2 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® 8 Gen 3 Mobile | 5.054 ms | 0 - 177 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® QCS8275 (Proxy) | 56.0 ms | 0 - 141 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® QCS8550 (Proxy) | 6.691 ms | 0 - 2 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® SA8775P | 13.889 ms | 0 - 143 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® SA8775P | 13.889 ms | 0 - 143 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® SA8775P | 13.889 ms | 0 - 143 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® QCS9075 | 14.197 ms | 0 - 2 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® QCS8450 (Proxy) | 13.495 ms | 0 - 174 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® SA7255P | 56.0 ms | 0 - 141 MB | NPU
| DnCNN | QNN_DLC | float | Qualcomm® SA8295P | 15.306 ms | 0 - 139 MB | NPU
| DnCNN | QNN_DLC | float | Snapdragon® 8 Elite For Galaxy Mobile | 4.029 ms | 0 - 142 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 8 Elite Gen 5 Mobile | 0.76 ms | 0 - 31 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 8 Elite Mobile | 1.221 ms | 0 - 33 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® X2 Elite | 1.222 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® X Elite | 2.001 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® X Elite | 2.001 ms | 0 - 0 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 8 Gen 3 Mobile | 1.325 ms | 0 - 46 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCS6490 | 7.733 ms | 2 - 4 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCS8275 (Proxy) | 7.586 ms | 0 - 28 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCS8550 (Proxy) | 1.794 ms | 0 - 9 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® SA8775P | 2.002 ms | 0 - 30 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® SA8775P | 2.002 ms | 0 - 30 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® SA8775P | 2.002 ms | 0 - 30 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCS9075 | 1.933 ms | 0 - 2 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCM6690 | 38.881 ms | 0 - 141 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® QCS8450 (Proxy) | 2.384 ms | 0 - 47 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® SA7255P | 7.586 ms | 0 - 28 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Qualcomm® SA8295P | 4.224 ms | 0 - 26 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 8 Elite For Galaxy Mobile | 1.221 ms | 0 - 33 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 7 Gen 4 Mobile | 3.251 ms | 0 - 140 MB | NPU
| DnCNN | QNN_DLC | w8a8 | Snapdragon® 7 Gen 4 Mobile | 3.251 ms | 0 - 140 MB | NPU
| DnCNN | TFLITE | float | Snapdragon® 8 Elite Gen 5 Mobile | 3.084 ms | 0 - 148 MB | NPU
| DnCNN | TFLITE | float | Snapdragon® 8 Elite Mobile | 4.13 ms | 0 - 143 MB | NPU
| DnCNN | TFLITE | float | Snapdragon® 8 Gen 3 Mobile | 5.188 ms | 0 - 179 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® QCS8275 (Proxy) | 56.391 ms | 0 - 142 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® QCS8550 (Proxy) | 6.945 ms | 0 - 2 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® SA8775P | 14.128 ms | 0 - 144 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® SA8775P | 14.128 ms | 0 - 144 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® SA8775P | 14.128 ms | 0 - 144 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® QCS9075 | 14.355 ms | 0 - 4 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® QCS8450 (Proxy) | 13.996 ms | 0 - 176 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® SA7255P | 56.391 ms | 0 - 142 MB | NPU
| DnCNN | TFLITE | float | Qualcomm® SA8295P | 15.602 ms | 0 - 141 MB | NPU
| DnCNN | TFLITE | float | Snapdragon® 8 Elite For Galaxy Mobile | 4.13 ms | 0 - 143 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 8 Elite Gen 5 Mobile | 0.717 ms | 0 - 32 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 8 Elite Mobile | 1.178 ms | 0 - 33 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 8 Gen 3 Mobile | 1.298 ms | 0 - 47 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCS6490 | 7.804 ms | 0 - 3 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCS8275 (Proxy) | 7.512 ms | 0 - 29 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCS8550 (Proxy) | 1.725 ms | 0 - 4 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® SA8775P | 1.977 ms | 0 - 31 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® SA8775P | 1.977 ms | 0 - 31 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® SA8775P | 1.977 ms | 0 - 31 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCS9075 | 1.85 ms | 0 - 3 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCM6690 | 38.977 ms | 0 - 141 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® QCS8450 (Proxy) | 2.338 ms | 0 - 49 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® SA7255P | 7.512 ms | 0 - 29 MB | NPU
| DnCNN | TFLITE | w8a8 | Qualcomm® SA8295P | 4.183 ms | 0 - 27 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 8 Elite For Galaxy Mobile | 1.178 ms | 0 - 33 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 7 Gen 4 Mobile | 3.214 ms | 0 - 145 MB | NPU
| DnCNN | TFLITE | w8a8 | Snapdragon® 7 Gen 4 Mobile | 3.214 ms | 0 - 145 MB | NPU

## License
* The license for the original implementation of DnCNN can be found
  [here](https://github.com/cszn/KAIR/blob/master/LICENSE).

## References
* [Beyond a Gaussian Denoiser: Residual Learning of Deep CNN for Image Denoising](https://arxiv.org/abs/1608.03981)
* [Source Model Implementation](https://github.com/cszn/KAIR)

## Community
* Join [our AI Hub Slack community](https://aihub.qualcomm.com/community/slack) to collaborate, post questions and learn more about on-device AI.
* For questions or feedback please [reach out to us](mailto:ai-hub-support@qti.qualcomm.com).