---
comments: true
description: MobileSAM is a lightweight adaptation of the Segment Anything Model (SAM) designed for mobile applications. It maintains the full functionality of the original SAM while significantly improving speed, making it suitable for CPU-only edge devices, such as mobile phones.
keywords: MobileSAM, Faster Segment Anything, Segment Anything, Segment Anything Model, SAM, Meta SAM, image segmentation, promptable segmentation, zero-shot performance, SA-1B dataset, advanced architecture, auto-annotation, Ultralytics, pre-trained models, SAM base, SAM large, instance segmentation, computer vision, AI, artificial intelligence, machine learning, data annotation, segmentation masks, detection model, YOLO detection model, bibtex, Meta AI
---

![MobileSAM Logo](https://github.com/ChaoningZhang/MobileSAM/blob/master/assets/logo2.png?raw=true)

# Mobile Segment Anything (MobileSAM)

The MobileSAM paper is now available on [arXiv](https://arxiv.org/pdf/2306.14289.pdf).

A demonstration of MobileSAM running on a CPU can be accessed at this [demo link](https://huggingface.co/spaces/dhkim2810/MobileSAM). The performance on a Mac i5 CPU takes approximately 3 seconds. On the Hugging Face demo, the interface and lower-performance CPUs contribute to a slower response, but it continues to function effectively.

MobileSAM is implemented in various projects including [Grounding-SAM](https://github.com/IDEA-Research/Grounded-Segment-Anything), [AnyLabeling](https://github.com/vietanhdev/anylabeling), and [SegmentAnythingin3D](https://github.com/Jumpat/SegmentAnythingin3D).

MobileSAM is trained on a single GPU with a 100k dataset (1% of the original images) in less than a day. The code for this training will be made available in the future.

## Adapting from SAM to MobileSAM

Since MobileSAM retains the same pipeline as the original SAM, we have incorporated the original's pre-processing, post-processing, and all other interfaces. Consequently, those currently using the original SAM can transition to MobileSAM with minimal effort.

MobileSAM performs comparably to the original SAM and retains the same pipeline except for a change in the image encoder. Specifically, we replace the original heavyweight ViT-H encoder (632M) with a smaller Tiny-ViT (5M). On a single GPU, MobileSAM operates at about 12ms per image: 8ms on the image encoder and 4ms on the mask decoder.

The following table provides a comparison of ViT-based image encoders:

| Image Encoder | Original SAM | MobileSAM |
|---------------|--------------|-----------|
| Parameters    | 611M         | 5M        |
| Speed         | 452ms        | 8ms       |

Both the original SAM and MobileSAM utilize the same prompt-guided mask decoder:

| Mask Decoder | Original SAM | MobileSAM |
|--------------|--------------|-----------|
| Parameters   | 3.876M       | 3.876M    |
| Speed        | 4ms          | 4ms       |

Here is the comparison of the whole pipeline:

| Whole Pipeline (Enc+Dec) | Original SAM | MobileSAM |
|--------------------------|--------------|-----------|
| Parameters               | 615M         | 9.66M     |
| Speed                    | 456ms        | 12ms      |

The performance of MobileSAM and the original SAM are demonstrated using both a point and a box as prompts.

![Image with Point as Prompt](https://raw.githubusercontent.com/ChaoningZhang/MobileSAM/master/assets/mask_box.jpg?raw=true)

![Image with Box as Prompt](https://raw.githubusercontent.com/ChaoningZhang/MobileSAM/master/assets/mask_box.jpg?raw=true)

With its superior performance, MobileSAM is approximately 5 times smaller and 7 times faster than the current FastSAM. More details are available at the [MobileSAM project page](https://github.com/ChaoningZhang/MobileSAM).

## Testing MobileSAM in Ultralytics

Just like the original SAM, we offer a straightforward testing method in Ultralytics, including modes for both Point and Box prompts.

### Model Download

You can download the model [here](https://github.com/ChaoningZhang/MobileSAM/blob/master/weights/mobile_sam.pt).

### Point Prompt

```python
from ultralytics import SAM

# Load the model
model = SAM('mobile_sam.pt')

# Predict a segment based on a point prompt
model.predict('ultralytics/assets/zidane.jpg', points=[900, 370], labels=[1])
```

### Box Prompt

```python
from ultralytics import SAM

# Load the model
model = SAM('mobile_sam.pt')

# Predict a segment based on a box prompt
model.predict('ultralytics/assets/zidane.jpg', bboxes=[439, 437, 524, 709])
```

We have implemented `MobileSAM` and `SAM` using the same API. For more usage information, please see the [SAM page](./sam.md).

### Citing MobileSAM

If you find MobileSAM useful in your research or development work, please consider citing our paper:

```bibtex
@article{mobile_sam,
  title={Faster Segment Anything: Towards Lightweight SAM for Mobile Applications},
  author={Zhang, Chaoning and Han, Dongshen and Qiao, Yu and Kim, Jung Uk and Bae, Sung Ho and Lee, Seungkyu and Hong, Choong Seon},
  journal={arXiv preprint arXiv:2306.14289},
  year={2023}
}
```