What is Custom Vision?
Azure Custom Vision is an image recognition service that lets you build, deploy, and improve your own image identifier models. An image identifier applies labels to images, according to their detected visual characteristics. Each label represents a classifications or objects. Unlike the Computer Vision service, Custom Vision allows you to specify your own labels and train custom models to detect them.
This documentation contains the following types of articles:
- The quickstarts are step-by-step instructions that let you make calls to the service and get results in a short period of time.
- The how-to guides contain instructions for using the service in more specific or customized ways.
- The tutorials are longer guides that show you how to use this service as a component in broader business solutions.
What it does
The Custom Vision service uses a machine learning algorithm to analyze images. You, the developer, submit groups of images that have and don't have the characteristics in question. You label the images yourself at the time of submission. Then the algorithm trains to this data and calculates its own accuracy by testing itself on those same images. Once you've trained the algorithm, you can test, retrain, and eventually use it in your image recognition app to classify images. You can also export the model itself for offline use.
Classification and object detection
Custom Vision functionality can be divided into two features. Image classification applies one or more labels to an entire image. Object detection is similar, but it returns the coordinates in the image where the applied label(s) can be found.
Optimization
The Custom Vision service is optimized to quickly recognize major differences between images, so you can start prototyping your model with a small amount of data. 50 images per label are generally a good start. However, the service is not optimal for detecting subtle differences in images (for example, detecting minor cracks or dents in quality assurance scenarios).
Additionally, you can choose from several variations of the Custom Vision algorithm that are optimized for images with certain subject material—for example, landmarks or retail items. See Select a domain for more information.
What it includes
The Custom Vision Service is available as a set of native SDKs as well as through a web-based interface on the Custom Vision portal. You can create, test, and train a model through either interface or use both together.
Supported browsers for Custom Vision web portal
The Custom Vision portal can be used by the following web browsers:
- Microsoft Edge (latest version)
- Google Chrome (latest version)
Backup and disaster recovery
As a part of Azure, Custom Vision Service has components that are maintained across multiple regions. Service zones and regions are used by all of our services to provide continued service to our customers. For more information on zones and regions, see Azure regions. If you need additional information or have any issues, please contact support.
Data privacy and security
As with all of the Cognitive Services, developers using the Custom Vision service should be aware of Microsoft's policies on customer data. See the Cognitive Services page on the Microsoft Trust Center to learn more.
Data residency
Custom Vision primarily doesn't replicate data out of the specified region, except for one region, NorthCentralUS, where there is no local Azure Support.
Next steps
Follow the Build a classifier quickstart to get started using Custom Vision on the web portal, or complete an SDK quickstart to implement the basic scenarios in code.
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