plotSFR

Plot spatial frequency response of edge

Syntax

plotSFR(sharpnessMeasurementTable)

plotSFR(sharpnessMeasurementTable,Name,Value)

Description

plotSFR(sharpnessMeasurementTable) plots the spatial frequency response (SFR) in a sharpness measurement table or aggregate sharpness measurement table.

plotSFR(sharpnessMeasurementTable,Name,Value) plots the SFR, specifying additional parameters to control aspects of the display.

Examples

Plot Spatial Frequency Response of Specific ROIs from an eSFR Chart

This example shows how to display the spatial frequency response (SFR) plot of a specified subset of the 60 slanted edge ROIs on an Imatest® eSFR chart.

Read an image of an eSFR chart into the workspace.

I = imread('eSFRTestImage.jpg');

Create an esfrChart object, then display the chart with ROI annotations. The 60 slanted edge ROIs are labeled with green numbers.

chart = esfrChart(I);
displayChart(chart,'displayGrayROIs',false,...
    'displayColorROIs',false,'displayRegistrationPoints',false)

Measure the edge sharpness in all ROIs and return the measurements in sharpnessTable.

sharpnessTable = measureSharpness(chart);

Display the SFR plot of ROIs 26 and 27 only.

plotSFR(sharpnessTable,'ROIIndex',[26 27]);

Input Arguments

sharpnessMeasurementTable — SFR measurements

sharpness table | aggregate sharpness table

SFR measurements of edges, specified as a sharpness table or aggregate sharpness table with m rows:

• When sharpnessMeasurementTable is a sharpness table, m is the number of sampled ROIs.

• When sharpnessMeasurementTable is an aggregate sharpness table, m is either 1 or 2, corresponding to the number of sampled orientations.

To obtain a sharpness table or aggregate sharpness table, use the measureSharpness function.

Data Types: table

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: plotSFR(myTable,'ROIIndex',2) displays the measured sharpness only of ROI 2.

'ROIIndex' — ROI indices

scalar | vector

ROI indices to display, specified as the comma-separated pair consisting of 'ROIIndex' and a scalar or vector of integers in the range [1, 60]. The indices match the ROI numbers displayed by displayChart.

• When sharpnessMeasurementTable is a sharpness table, by default plotSFR creates only one figure, showing the SFR plot from the first row of the table.

• When sharpnessMeasurementTable is an aggregate sharpness table, plotSFR ignores the specified ROIIndex, and creates one figure for each row in the table.

Example: 29:32

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32

'displayLegend' — Display plot legend

true (default) | false

Display plot legend, specified as the comma-separated pair consisting of 'displayLegend' and true or false. When displayLegend is true, the SFR plot shows a legend that identifies the different curves on the plot.

Data Types: logical

'displayTitle' — Display plot title

true (default) | false

Display plot title, specified as the comma-separated pair consisting of 'displayTitle' and true or false. When displayTitle is true, the SFR plot shows a title that indicates the individual ROI index or aggregate ROI orientation.

Data Types: logical

'Parent' — Axes handle of displayed image object

axes handle

Axes handle of the displayed image object, specified as the comma-separated pair consisting of 'Parent' and an axes handle. Parent specifies the parent of the image object created by plotSFR.