Blocked Images

Read and navigate very large images

A very large image may not fit into memory, which makes it challenging to display and process. The blockedImage object solves this problem by representing an image as a collection of smaller blocks of data that can be independently loaded and processed. A blockedImage object can support large images and images with one or multiple resolution levels.

Functions

`blockedImage`	Image made from discrete blocks
`blockedImageDatastore`	Datastore for use with blocks from `blockedImage` objects
`blockLocationSet`	List of block locations in large images
`selectBlockLocations`	Select blocks from blocked images
`bigimageshow`	Display 2-D `blockedImage` object
`showmask`	Show mask overlay at specified inclusion threshold
`showlabels`	Display label overlay on `bigimageshow` object
`apply`	Process blocks of blocked image
`polyToBlockedImage`	Create labeled `blockedImage` object from set of ROIs

Topics

Set Up Spatial Referencing for Blocked Images
This example shows how to set up and verify the spatial referencing information of a blockedImage object.
Read Whole-Slide Images with Custom Blocked Image Adapter
This example shows how to add support for reading whole-slide images by creating a custom blocked image adapter.
Label Large Images in the Image Labeler (Computer Vision Toolbox)
This section describes the differences with using the Image Labeler app with blocked images.

Featured Examples

Process Blocked Images Efficiently Using Partial Images or Lower Resolutions

Process a blocked image quickly using two strategies that enable computations on smaller representative samples of the high-resolution image.

Open Script

Process Blocked Images Efficiently Using Mask

Process a blocked image efficiently by using a mask to isolate regions of interest (ROIs).

Open Live Script

Create Labeled Blocked Image from ROIs and Masks

Create a labeled blocked image from a set of ROIs.

Open Live Script

Convert Image Labeler Polygons to Labeled Blocked Image for Semantic Segmentation

Convert polygon labels stored in a groundTruth object into a labeled blocked image suitable for semantic segmentation workflows.

Open Live Script

Work with Blocked Images Using Volume Segmenter

Work with a single-resolution blocked image in the Volume Segmenter app.

Open Live Script

Preprocess Multiresolution Images for Training Classification Network

Prepare datastores that read and preprocess multiresolution whole slide images (WSIs) that might not fit in memory.

Open Live Script

Classify Tumors in Multiresolution Blocked Images

Classify multiresolution whole slide images (WSIs) that might not fit in memory using an Inception-v3 deep neural network.

Open Live Script

Explore Blocked Image Details with Interactive ROIs

Display a detailed region of a blocked image selected interactively using ROI tools.

Open Script

Warp Blocked Image at Coarse and Fine Resolution Levels

Apply a geometric transformation (warping) to a blocked image.

Open Live Script