# VNSequenceRequestHandler An object that processes image-analysis requests for each frame in a sequence. ``` class VNSequenceRequestHandler ``` ## Overview Instantiate this handler to perform Vision requests on a series of images. Unlike the [`VNImageRequestHandler`](/documentation/Vision/VNImageRequestHandler), you don’t specify the image on creation. Instead, you supply each image frame one by one as you continue to call one of the `perform` methods. ## Topics ### Initializing a Sequence Request [`init()`](/documentation/Vision/VNSequenceRequestHandler/init()) Initializes a sequence request handler. ### Performing a Sequence Request [`perform(_:on:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:)-3zt7l) Schedules Vision requests to be performed on a Core Graphics image. [`perform(_:on:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:orientation:)-3gcmv) Schedules one or more Vision requests to be performed on a Core Graphics image with known orientation. [`perform(_:on:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:)-9jtgj) Schedules one or more Vision requests to be performed on Core Image image data. [`perform(_:on:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:orientation:)-1bkm1) Schedules one or more Vision requests to be performed on Core Image image data with known orientation. [`perform(_:on:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:)-3d7nt) Schedules one or more Vision requests to be performed on a Core Video pixel buffer. [`perform(_:on:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:orientation:)-2wvt8) Schedules one or more Vision requests to be performed on a Core Video pixel buffer with known orientation. [`perform(_:on:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:)-45e73) Performs one or more requests on an image contained within a sample buffer. [`perform(_:on:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:on:orientation:)-6b7rk) Performs one or more requests on an image of a specified orientation contained within a sample buffer. [`perform(_:onImageData:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:onImageData:)) Schedules one or more Vision requests to be performed on raw image data. [`perform(_:onImageData:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:onImageData:orientation:)) Schedules one or more Vision requests to be performed on raw data containing an image with known orientation. [`perform(_:onImageURL:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:onImageURL:)) Schedules one or more Vision requests to be performed on an image. [`perform(_:onImageURL:orientation:)`](/documentation/Vision/VNSequenceRequestHandler/perform(_:onImageURL:orientation:)) Schedules one or more Vision requests to be performed on an image with known orientation, at a specific URL. --- Copyright © 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)