Leader SFR-Fit MTF Measurement Software

May 21, 2024
July 15, 2024


Software for measuring the spatial frequency response (SFR) of cameras

SFR-Fit is camera resolution measurement software that measures MTF (Modulation Transfer Function). MTF indicates spatial frequency characteristics using multiple distortion and uniformity-corrected sine patterns that can be presented across one or more displays.

Conventional MTF measurement methods can have issues with black box camera systems that prevent the acquisition of the RAW or minimally processed image.  If these systems have sharpening enabled, slanted edges can overstate MTF, especially at high frequencies.

The SFR-Fit measurement system can produce highly accurate measurements of automotive cameras and is compatible with ultra-wide-angle lenses.

Annual subscription license

Displays used as test targets are to be purchased separately.  A matte surface display and at least 3x higher display pixel density vs camera resolution are suggested. 

Click here for a guide on selecting displays.

SKU: LD-SFR-Fit Category:



SFR-Fit is camera resolution measurement software produced by Leader Electronics Corporation that measures MTF (Modulation Transfer Function), which indicates spatial frequency characteristics. MTF is the spatial frequency characteristic that expresses how faithfully the contrast of the subject for the imaging target can be reproduced and is the most important measurement item for evaluating camera performance.

Conventional MTF measurement methods are generally the slanted edge method based on ISO 12233 or the sine wave method using the Siemens Star chart. Since SFR-Fit generates a test pattern according to the image, it can handle images with large distortions and digitally processed images such as sharpness, which were difficult to measure with conventional methods.

License type: Annual subscription


Resistant to noise and image processing

Since the sine wave contrast method is used as the measurement method, it is not easily affected by image noise, and it is possible to measure images that have undergone digital processing, such as sharpening and compression, with excellent accuracy and repeatability.

Compatible with fisheye and ultra-wide-angle cameras

Analysis of distortion of images such as fisheye lenses and correct the distortion of the test pattern. The test pattern generates multiple bar charts with different spatial frequencies and displays them on the display while switching for each spatial frequency. This feature allows you to measure MTF without being affected by image distortion. SFR-Fit automatically performs everything from distortion analysis to measurement, making it easy to measure the MTF of ultra-wide-angle cameras such as fisheye cameras, which has been difficult to measure in the past.

Display-based test targets

After displaying a checkerboard chart for analyzing image distortion, multiple sinusoidally modulated patterns are displayed at various spatial frequencies to establish an MTF curve.

Local MTF measurements are possible

Since the bar chart is switched for each spatial frequency, the measurement area (ROI) is miniaturized and it is possible to measure the partial MTF. For example, you can arbitrarily set the measurement points such as the center of the image and the image height of 40% or 80%.

The measurement area can be easily set by mouse operation

The measurement area can be set by simply clicking and dragging the measurement area (ROI) to the desired location on the image. It is also possible to set by entering numerical values.

Placement of measurement equipment

Since a test pattern is generated according to the measurement point, it is possible to measure the MTF around a camera with a wide angle of view.