# Defining View

VisionPro Deep Learning tools operate on an area of the image called a view A view of an image is a region of pixels in an image. Tool processing is limited to the pixels within the view. You can manually specify a view, or you can use the results of an upstream tool to generate a view.. A view can be the entire image, a user-defined rectangular area of the image, or the output of a tool, depending on the tool.

The application constructs the initial view after you have defined the ROI The Region of Interest (ROI) defines the area of operation for the tool. The ROI preserves the positions, angles, stretch and skew of the original image. for the first tool. The first tool requires manual segmentation Segmentation is the process of selecting a view from an image., which you can perform by defining the ROI to create the view.

When you have multiple tools in a tool chain, the tools in the chain can use the result of the preceding tool to select the view dynamically. For example, you can use a a Blue Locate tool to crop an area of the image and use it as the ROI so that the following tools all operate with the same position and orientation.