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Imatest Documentation Spatial Frequency Response (MTF) Lower left: Frequency domain (MTF) plot Black line (bold) Red line (dashed,bold) Right column text (results) Input data Spatial Frequency Response (MTF) for the luminance (Y) channel. Unprocessed. Spatial Frequency Response (MTF) for the luminance (Y) channel with Standardized sharpening. [Std Sharpening checked] MTF50 (50% contrast spatial frequency) for the original uncorrected image in cycles/pixel and line widths per picture height (LW/PH). Its relationship to print quality is discussed in Interpretation of MTF50. MTF50 (with standardized sharpening; corrected) in cycles/pixel and LW/PH. Radius R used for setting standardized sharpening is displayed. Defaults to 2 (larger for unusually broad transitions (poor MTF response)). It may be adjusted in the input dialog box. [Std Sharpening checked] Equivalent "ideal megapixels" in brackets [n mpxls ideal]: a number based on the concept that the "ideal" pixel would have an MTF of 1 up to the Nyquist frequency (0.5 C/P), and 0 above, and hence, MTF50 = 0.5 C/P. The number of "ideal pixels" that would yield the identical sharpness (MTF50) is, 4 * MTF50(C/P horizontal) * horizontal pixels * MTF50(C/P vertical) * vertical pixels The number displayed assumes that MTF50 is the same in horizontal and vertical directions— usually, but not always, a good assumption— there are exceptions, such as the Nikon D70. You should not expect the "ideal megapixel" count to equal the total megapixel count of the camera. In the real world, performance is excellent if it is half the actual megapixels. In cameras with weak anti-aliasing filters or a high degree of sharpening, MTF may be greater than 0.5 at the Nyquist frequency. In this case, [> n mpxls ideal] is displayed, where n is the total number of pixels in the camera, is displayed. Larger numbers are meaningless. Aliasing issues such as moire patterns may be present, but the simple slanted edge pattern cannot be used to evaluate the seriousness of aliasing. MTF50P (spatial frequency where contrast is 50% of its peak value) for the original uncorrected image in cycles/pixel and line widths per picture height (LW/PH). This is the same as MTF50 for slightly to moderately sharpened edges, but smaller for oversharpened edges. It may be a better indicator than MTF50 of the perceived sharpness of oversharpened images. [Std Sharpening off] Oversharpening or undersharpening. The amount the camera is over- or undersharpened with respect to standardized sharpening. 100% ( MTF( feql ) - 1) where feql is the frequency where MTF is set to 1 by standardized sharpening. [Std Sharpening checked] MTF30 (30% contrast spatial frequency for the original uncorrected image) is the default value of the Secondary Readout, which can be set in the SFR input dialog window. You can select MTFxx, the spatial frequency for xx% contrast, or the MTF at a spatial frequency specified in cycles/pixel, pixels/mm, or pixels/inch. MTF at the Nyquist frequency. May indicate of the effectiveness of the anti-aliasing filter and likelihood of aliasing effects such as Moire patterns. But it not an unambiguous indicator because aliasing is related to sensor response, and MTF at Nyquist is the product of sensor response, the de-mosaicing algorithm, and sharpening, which can boost response at Nyquist for radii less than 1. Aliasing effects may become serious over 0.3. There is a tradeoff: the more effective the sensor anti-aliasing, the worse the sharpness. Foveon sensors (used in the Sigma SD9 and SD10) are more tolerant of aliasing than Bayer sensors, which are used in most digital cameras. Nyquist frequency: Half the sampling rate = 1/(2*pixel spacing). Always 0.5 cycles/pixel. Indicated by the vertical blue line. 146 of 451
Imatest Documentation Right: Input data Top right image Thumbnail of the entire image, showing the location of the selected region of interest (ROI) in red. Middle right image The selected region of interrest (ROI), shown with the correct aspect ratio, but not necessarily the exact size. The following parameters are displayed below the image. ROI size in pixels ROI boundary locations (Left, Right, Top, and Bottom) in pixels from the upper-left corner, Edge angle in degrees, and Estimated chart contrast, derived from the average pixel levels of the light and dark areas (away from the transition) and gamma. The equation: Estimated chart contrast = (avg. pixel level of light area/avg. pixel level of dark area)^(1/gamma) Lower right text Selected EXIF data: Data recorded by the digital camera. Only for JPEG files. May include ISO speed, aperture, and other details. Thanks to Matthias Wandel for jhead.exe. 147 of 451
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