Create a spatial resolution slanted bar target

Slanted bar scenes are used measuring the ISO 12233 standard for spatial resolution (spatial frequency responce). This function and related ones are embedded into the interface and illustrated in other scripts.

sceneCreate('slantedBar',imageSize,edgeSlope, fieldOfView, illPhotons);

See also: ieISO12233, ISOFindSlantedBar, sceneCreate, metricsCamera

Copyright ImagEval Consultants, LLC, 2010.

Contents

ieInit

Slanted bar parameters

sz          = 256;
barSlope    = 2.6;
fieldOfView = 2;
meanL = 100;

An example slanted bar

% The default slanted bar is created with an illuminant of equal photons
% across wavelengths
scene = sceneCreate('slantedBar', sz, barSlope, fieldOfView);
scene = sceneAdjustLuminance(scene,meanL);

% Have a look at the image in the scene Window
ieAddObject(scene);
sceneWindow;

% Here is the scene energy
scenePlot(scene,'illuminant energy roi')

No ROI needed unless spatial spectral illluminant

ans = 

  struct with fields:

       wave: [31×1 single]
     energy: [31×1 single]
    comment: []

Change the slanted bar to a D65 illuminant, rather than equal energy

scene = sceneAdjustIlluminant(scene,'D65.mat');

% Have a look
ieAddObject(scene);
sceneWindow;
scenePlot(scene,'illuminant energy roi')

No ROI needed unless spatial spectral illluminant

ans = 

  struct with fields:

       wave: [31×1 single]
     energy: [31×1 single]
    comment: 'D65.mat'

Create slanted bar with another slope

barSlope    = 3.6;
sz          = 128;
fieldOfView = 0.5;

scene = sceneCreate('slantedBar', sz, barSlope, fieldOfView);
ieAddObject(scene);
sceneWindow;

Published with MATLAB® R2024a