Imatest SFRplus Test Chart

Our SFRplus targets support a wide range of image testing applications. Options include:

Contrast Ratio Options

4:1 contrast ratio complies with the contrast requirements of the IS0 12233:2014 and ISO 12233:2017 standards.
10:1 and 2:1 contrast ratios. Use of both contrast levels improves ability to analyze non-linear signal processing, which may not affect the lower contrast 2:1 contrast ratio regions
10:1 contrast only improves the completeness of 3D maps of performance across the imaging surface.

Substrate Options

- Inkjet on Matte Paper can be easier to light because it has less specular reflection than the semi-gloss paper. The MTF is slightly less than semi-gloss paper and does not have as deep dark tones on the stepchart.

All of our ink jet printed charts have an approximate MTF50 of 5 cycles/mm. For a comparison of reflective surfaces, as well as what this means when choosing your chart, please visit our Reflective Surface Comparison Blog. Please keep this in mind when choosing the size of chart. Using a chart that is too small with a high-resolution sensor can result in the MTF of the chart degrading the measured MTF of the camera system. In addition, it is important to use a chart that is large enough to accommodate the minimum focus distance, as well as the resolution of your sensor.

Inkjet on Semi-gloss Paper has slightly higher density than matte, has deeper black tones on the stepchart. Due to the difficulty of lighting this evenly without introducing specular reflections, we do not recommend Semigloss targets.
LVT Color Film offers the best possible density range, low noise, color and fine detail.
LVT Black & White Film provides a wide density range, low noise, and fine detail. The edges have an MTF50 >= 10 cycles/mm, which is approximately two times better than the best inkjet charts. For more information, please see our Transmissive Chart Quality Comparison. The large patterns are fine enough to produce good results with up to 30 megapixel cameras…..
The SFRplus target is also available as Chrome on Glass, Photographic, High Stress Targets, and Infrared / NIR Targets.

Square Grid Dimensions Options

5 x 9 squares grid dimension is recommended for for typical DSLR formats with aspect ratios of 3:2 and typical HDTV formats with aspect ratios of 16:9.
5 x 7 squares grid dimension is recommended for typical compact camera formats with aspect ratios of 4:3.

Size Options by Substrate (Total Size and Active Area Dimensions)

Inkjet charts are available in five main sizes with variations depending on the grid dimensions selected. It is recommended that the medium sized charts be used to test imaging systems with sensors up to 14MP, the large charts be used for testing of sensors above 14MP and up to approximately 28MP, and the extra-large charts be used for sensor sizes above 28MP and up to 48MP.

The active area of the chart includes white space above and below the top and bottom distortion bars. It is slightly larger than the printed area, which is bounded by the distortion bars on top and bottom. White space is included in active area because test images of the chart must include this white space in order to enable automated processing in SFRplus software.

Inkjet Chart Sizing: Paper Size (Including Margin) and Active Area

	5 x 9 Squares		5 x 7 Squares
		Paper Size	Active Area	Paper Size	Active Area
	X-Small	21.59cm x 38.1cm (8.5″ × 15″)	19.76cm x 35.56cm (7.778” x 14”)	21.59cm x 25.4cm (8.5″ × 10″)	16.33cm x 22.86cm (6.429” x 9”)
Small	35.56cm x 60.96cm (14″ × 24″)	32.46cm x 58.42cm (12.778” x 23”)	35.56cm x 50.8cm (14″ × 20″)	34.47cm x 48.26cm (13.571” x 19” )
Medium	60.96cm x 101.6cm (24″ × 40″)	55.03cm x 99.06cm (21.667” x 39”)	60.96cm x 86.36cm (24″ × 34″)	59.87cm x 83.82cm (23.571” x 33”)
Large	111.76cm x 152.4cm (43.6″ × 60″)	83.26cm x 149.86cm (32.778” x 59”)	111.76cm x 152.4cm (43.6″ × 60″)	107.04cm x 149.86cm (42.143” x 59”)
X-Large	111.76cm x 187.96cm (43.6″ × 74″)	103.01cm x 185.42cm (40.556” x 73”)	111.76cm x 162.56cm (43.6″ × 64″)	110.74cm x 160.02cm (43.6” x 63”)

Color LVT Film Chart Sizes

5 x 7 Squares Multi-Chart Dimensions		5 x 9 Squares Multi-Chart Dimensions		Medium Dimensions (5 x 7 Squares Only)		Small Dimensions (5 x 7 Squares Only)
Active Area	Bar-to-Bar Height	Active Area	Bar-to-Bar Height	Active Area	Bar-to-Bar Height	Active Area	Bar-to-Bar Height
197mm × 136mm (7.75″ × 5.357″)	128mm (5.208″)	235mm × 131mm (9.25″ × 5.139″)	122.8mm (4.834″)	229mm × 163.2mm (9.016″ × 6.425″)	153.5mm (6.043″)	160mm × 114.3mm (6.3″ × 4.5″)	107.5mm (4.23″)
102mm × 70mm (4″ × 2.765″)	66.1mm (2.601″)	102mm × 56mm (4″ × 2.222″)	53.1mm (2.090″)
64mm × 44mm (2.5″ × 1.728″)	41.3mm (1.625″)	76mm × 42mm (3″ × 1.667″)	39.8mm (1.568″)
51mm × 35mm (2″ × 1.328″)	33mm (1.3″)	51mm × 28mm (2″ × 1.111″)	26.5mm (1.045″)
38mm × 26mm (1.5″ × 1.027″)	24.8mm (0.975″)	38mm × 21mm (1.5″ × 0.833″)	19.9mm (0.784″)

Black & White Film Chart Sizes

This 5 x 9 squares chart has an active chart area of 48.3cm x 26.81cm (19″ x 10.56″) in a total film size of 30.48cm x 50.8cm (12″ x 20″). Bar-to-bar height is 252mm (9.92″). An optional color film patch can be applied to this target.

Color Chart Options

Inclusion of the color chart enables testing of color accuracy. If the color option is selected, the “focus star” pattern that aides in focusing is replaced by a 20 patch color chart.

Pre-Distortion Options

Pre-distorted charts offer the ability to map the outer edges of a wide angle or fisheye lens using SFRplus. These distortion levels are available

Level	Matrix (5 x 7 squares)	Matrix (5 x 9 squares)
No distortion	[0 0]	[0 0]
Distort	[0.833 1.123]	[0.833 1.375]
Distort+	[1.167 1.577]	[1.167 1.982]
Ultradistort	[1.333 2.313]	[1.333 2.958]

We do not recommend using semi-gloss paper for wide angle lenses or pre-distorted charts.