Select a Region

To start the Pixel Region tool, click thePixel Regionbuttonin theImage Viewertoolbar or select thePixel Regionoption from theToolsmenu.Image Viewerdisplays the pixel region rectanglein the center of the target image and opens the Pixel Region tool.

Using the mouse, position the pointer over the pixel region rectangle. The pointer changes to the fleur shape,.

Click the left mouse button and drag the pixel region rectangle to any part of the image. As you move the pixel region rectangle over the image, the Pixel Region tool updates the pixel values displayed. You can also move the pixel region rectangle by moving the scroll bars in the Pixel Region tool window.

Customize the View

To get a closer view of image pixels, use the zoom buttons on the Pixel Region tool toolbar. As you zoom in, the size of the pixels displayed in the Pixel Region tool increase and fewer pixels are visible. As you zoom out, the size of the pixels in the Pixel Region tool decrease and more pixels are visible. To change the number of pixels displayed in the tool, without changing the magnification, resize the Pixel Region tool using the mouse.

As you zoom in or out, note how the size of the pixel region rectangle changes according to the magnification. You can resize the pixel region rectangle using the mouse. Resizing the pixel region rectangle changes the magnification of pixels displayed in the Pixel Region tool.

If the magnification allows, the Pixel Region tool overlays each pixel with its numeric value. For RGB images, this information includes three numeric values, one for each band of the image. For indexed images, this information includes the index value and the associated RGB value. If you would rather not see the numeric values in the display, go to the Pixel Region toolEditmenu and clear theSuperimpose Pixel Valuesoption.

Determine the Location of the Pixel Region Rectangle

To determine the current location of the pixel region in the target image, you can use the pixel information given at the bottom of the tool. This information includes thex- andy-coordinates of pixels in the target image coordinate system. When you move the pixel region rectangle over the target image, the pixel information given at the bottom of the tool is not updated until you move the cursor back over the Pixel Region tool.

You can also retrieve the current position of the pixel region rectangle by selecting theCopy Positionoption from the Pixel Region toolEditmenu. This option copies the position information to the clipboard. The position information is a vector of the form[xmin ymin width height]. To paste this position vector into the MATLAB workspace or another application, right-click and selectPastefrom the context menu.

The figure shows these components of the Pixel Region tool.

Print the View of the Image in the Pixel Region Tool

You can print the view of the image displayed in the Pixel Region tool. Select thePrint to Figureoption from the Pixel Region toolFilemenu. SeePrint Imagesfor more information.