MTF mapper

A utility to produce MTF (modulation transfer function, a measure of edge acuity) maps of images. The program will automatically detect dark rectangular objects on light backgrounds, and extract MTF values on all edges. Can help to tune SLR autofocus. See http://mtfmapper.blogspot.com for more usage examples.

Features

Automatically extracts dark (black) rectangular objects from images, and measures the Modulation Transfer Function (MTF, a measure of image sharpness) across the edges of the rectangles. Measurement is performed using the "slanted edge" method, similar to ISO 12233.
Using a special test chart (.pdf supplied), measure the point of sharpest focus relative to a reference point, i.e., measure front- or back-focus in DSLRs
Measure the MTF (sharpness) of your lens across the field of view
Works with many image formats, including JPEG and various raw formats
Provides feedback on chart orientation (for some chart types) helping you to correctly set up the chart relative to the camera sensor
Use the GUI to visualize and compare MTF/SFR curves between different images, or different edges within the same image

Project Samples

Edges of rectangular objects annotated automatically with MTF50 value (quality indication in colour), MTF/SFR curves of three different edges compared in pop-up window.

Sharpness measured as a function of distance on a 45-degree chart. Green curve represents MTF50.

MTF50 values (line pairs per mm) visualized as a 3d surface, across the field of view. Simulated lens has visible tilt.

Lens style MTF chart showing contrast across the field at user-selectable resolutions

MTF50 values (line pairs per mm) visualized across the field of view. Simulated lens has visible tilt.

Project Activity

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License

BSD License

Follow MTF mapper

MTF mapper Web Site

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