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The plugin performs system MTF calculations up to twice the Nyquist frequency over slanted vertical edge images with dark side at left; if the picture is taken from a horizontal slanted edge, the image must be rotated 90 degrees before running the plugin.
The use of a slanted, or skewed edge was proposed, in conjunction with corresponding data processing. One property of this modified method made it particularly useful for evaluating digital still cameras (DSC), reduction of aliasing caused by sampling of the color signals by the color filter array.
Common tests for lens resolution include reverse projection testing, modulation transfer function (MTF) testing, slanted edge MTF testing, and camera testing. Each of these methods provides a unique set of benefits and drawbacks.
The slanted-edge method of measuring the spatial frequency response (SFR) as an approximation of the mod-ulation transfer function (MTF) has become a well known and widely used image quality testing method over the last 10 years.
The modulation transfer function (MTF) is an important parameter for performance evaluation of optical imaging systems in photogrammetry and remote sensing; the slanted-edge method is one of the main methods for measuring MTF.
Siemens star SFR (MTF) from same (LX5 ISO 400 RAW→TIFF→PNG, USM R2A2-sharpened) image, Mean MTF50P = 0.344 C/P. The old slanted-edge calculation is very noisy— very ugly — so bad that the information capacity calculation fails.
The well-established Modulation Transfer Function (MTF) is an imaging performance parameter that is well suited to describing certain sources of detail loss, such as optical focus and motion blur.
The goal of this document is to compare the efects of demosaicing and sharpening (or bilateral filtering) on MTF measurements for the two most widely used test paterns — the slanted edge and the sinusoidal Siemens star.
The slanted-edge method of measuring the spatial frequency response (SFR) as an approximation of the modulation transfer function (MTF) has become a well known and widely used image quality testing method over the last 10 years. This method has been adopted by multiple international standards including ISO and IEEE.
In normal operation, MTF is the Fourier transform of the Point Spread Function (PSF). But for slanted edge-targeted MTF calculations, we use Line Spread Function (LSF) instead of PSF. This is because we assume LSF as a cross-section of PSF along the slant.