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Imatest Documentation Normalized contrast loss In a camera with uniform signal processing (i.e., the same sharpening and noise reduction throughout the image, regardless of the presence of edges), the contour lines would be vertical. Most cameras have a degree of sharpening (high frequency boost) in the presence of contrasty edges and noise reduction (high frequency attenuation) in their absence. This is evident in the display on the right (explained in more detail below). Displays MTF normalized to 1 at low spatial frequencies for all chart contrast levels, and at the maximum contrast level for all spatial frequencies (the top of the chart). Results can be difficult to interpret, especially in the presence of noise. Style selects the frequency scale and whether to show a color bar to the right of the main display. Style Description Log frequency Log frequency, color bar The horizontal axis displays frequency on a logarithmic scale. The maximum display frequency can be set by pressing Image settings & options . The horizontal axis displays frequency on a logarithmic scale. The maximum display frequency can be set by pressing Image settings & options . A color bar showing the color scale is displayed to the right of the main plot. Linear frequency The horizontal axis displays frequency on a linear scale. Linear frequency, color bar The horizontal axis displays frequency on a linear scale. A color bar showing the color scale is displayed to the right of the main plot. The displays on the right show the Normalized contrast level (MTF normalized to 1 at low spatial frequencies for all chart contrasts) for the Panasonic TZ1 camera with ISO speed set at 80 (right) and 800 (right, below). Spatial frequency is displayed on a linear scale with a maximum frequency of 0.5 cycles/pixel (selectable by pressing Image settings & options ). The image on the right (ISO 80) shows significant sharpening at moderate to high contrasts: peak normalized contrast is 1.2 or more for chart contrast greater than 0.4 and 1.1 or greater for chart contrast greater than 0.11. The amount of sharpening decreases gradually with chart contrast, ad evidence by the moderately slanted contour lines between 0.9 and 0.1 at contrasts over 0.1. Normalized contrast: Panasonic TZ1, ISO 80 208 of 451
Imatest Documentation The difference between the two images is striking. At ISO 800 the TZ1 has much less sharpening and more noise reduction— and correspondingly less detail. The amount of sharpening decreases more rapidly with contrast than for the ISO 80 case, as shown by the much more slanted contour lines. MTFnn (frequencies where MTF = nn% of low frequency or peak values) This selection produces a concise summary of results for this module. It has several options: Parameter Description MTFnn MTFnnP MTFnn NORMALIZED MTFnnP NORMALIZED Normalized contrast: Panasonic TZ1, ISO 800 The spatial frequency where MTF drops to nn% of its low frequency value. Curves are plotted for nn = 70, 50, 30, 20, and 10 (%). MTF50 is the most frequently used result; it corresponds to bandwidth in electrical engineering. The horizontal axis is the original chart contrast (analyzed in 24 rows). The vertical axis is the MTF frequency. Its scale (cycles/pixel, cycles/mm, cycles/in, or LW/PH) can be set by pressing Image settings & options . The spatial frequency where MTF drops to nn% of its maximum (peak) value. Identical to MTFnn for unsharpened or moderately sharpened images, but it can be lower for strongly sharpened images, which have a distinct response peak. It has a slightly better correlation to perceived sharpness than MTFnn. Horizontal and vertical axes are identical to MTFnn. The spatial frequency where MTF drops to nn% of its low frequency value, normalized to 1 at low spatial frequencies. This allows the percentage change of MTFnn with chart contrast (horizontal axis) to be conveniently compared. The spatial frequency where MTF drops to nn% of its maximum (peak) value, normalized to 1 at low spatial frequencies. This allows the percentage change of MTFnn with chart contrast (horizontal axis) to be conveniently compared. The plots on the right show MTF70 through MTF10 in units of Cycles/Pixel for the Panasonic TZ1 camera with ISO speed set at 80 (right) and 800 (right, below). They are derived from the same images as the Normalized contrast level plots, above. The MTFnn units (Cycles/pixel to Cycles/mm, Cycles/in, or LW/PH) can be selected using the Image settings & options button. MTF70-MTF10: Panasonic TZ1, ISO 80 209 of 451
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