Row Profile Plot

A Row Profile plots the pixel values along a line parallel to the image rows. This type of plot shows changes in image luminance, or pixel value, in the horizontal direction.

There are two ways to create a row profile plot: Use the Line Profile tool to draw along a row, or use the current command to plot the row(s) defined by the Image Cursor.

Types of Row Profile Plots

• Single Row

• Averaged Row. Various methods are available for combining the rows; see Plot Averaging Mode.

• Range of Rows showing multiple row profiles on the same graph.

If the Image Window has 2 or more images in an Image Set, Mira can make the same types of plots for either the active image or for the entire image set.

The Window Caption reminds you of the type of plot:

• An Average Row Profile plot has the suffix [ARP] in the window caption.

• A simple Row Profile of one row has the suffix [RP] in the window caption.

Procedures

Making a row profile plot involves two steps

1. Adjusting the image cursor to cover the desired pixels, and

2. Clicking the plotting button or executing the menu command to create the plot.

Plotting a Single Row

1. Set the command mode to Cursor Mode.

2. Click the mouse on the image to position the Image Cursor.

3. Adjust the corners or edges of the Image Cursor until it defines the region you wish to average. Combine moving and sizing operations to get the image cursor where you want it.

4. Execute the Plot > Row command in the menu or click the button to make the plot.

Plotting an Average Row

Mira AP can collapse the neighboring rows and plot the result as a single line of data. Mira provides different options for combining the adjacent lines to create the plot; see Plot Averaging Mode.

1. Set the command mode to Cursor Mode. If the image cursor is a rectangle, it outlines the region to be averaged into a single row. If it is a crosshair, the averaged region is the number of rows spanned by the crosshair. In both cases, the same number of rows will be averaged.

2. Combine moving and sizing operations to get the image cursor where you want it. Click the mouse on the image to position the cursor and adjust the corners or edges until it defines the range of rows to average.

3. Select the column combining method by choosing an option in the Combine Mode submenu of the buttons' drop menu, or use the image Plot menu or Image Context Menu. The name in the menu adjusts to the selected method.

4. Execute the particular [Average Column] command in the menu. The plot title depends on the currently selected Averaging Mode. Also see Plotting an Averaged Line.

Plotting a Range of Rows

1. Set the command mode to Cursor Mode. If the image cursor is a rectangle, it outlines the region of rows to be plotted. If it is a crosshair, the span of the crosshair defines the number of rows to be plotted. In both cases, the same number of rows will be plotted.

2. Combine moving and sizing operations to get the image cursor where you want it. Click the mouse on the image to position the cursor and adjust the corners or edges until it defines the range of rows to plot.

3. In the plotting menu set the Plot Series Mode to Overplot and then use the Range of Rows command. You can later change the Plot Series Mode from the Plot Window using its Context Menu.

Changing the Plot Appearance

After you have made the plot, the attributes can be changed using the Plot Attributes dialog. This includes properties such as the minimum and maximum extent of the axes, the tick marks, axis labels, fonts, colors, and more.

Related Topics

Column Profile Plot, Line Profile Plot, Plot Animation Toolbar, Plot Coordinate Systems, Plot Attributes