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Imatest Documentation Stepchart: Applied Image and ISO charts Applied Image and ISO charts In addition to linear reflective and transmission step charts, Stepchart (in Imatest Master) can analyze the tonal response and noise of a number of additional charts, all but one of which are available from Applied Image. These charts are described below. QA-61 ISO-16067-1 Scanner QA-62 ST-51 EIA Grayscale ST-52 ISO-14524 12-patch OECF target (circular) QA-61 REFLECTIVE SCANNER TEST CHART (ISO-16067-1) Data: Size 100mm x 152mm (4in x 6in); Designed to ISO-16067-1 specifications. Includes Landolt Ring, alphanumeric resolution and slant edge charts; grey step patches, horizontal, vertical and slanted ronchi patterns (6 - 40 c/mm) plus the APPLIED T-100 Digital Electronic Pixel target. Notes: Used for determining reflective light resolution & imaging characteristics of digital scanning systems. For full description, see QA-61 Product specifications. Part No. QA-61-ISO-16067-1-P-RP QA-62 Overall Size 102 x 152mm (4 x 6in) Material Reflective Material SLANT EDGE TARGET Slant Edge Scanner Target with Grayscale SFR & OECF #2 Ideal for evaluation response of digital systems to the slanted sharp edge function and used for MTF analysis. Data: Size 75mm x 75mm (3in x 3in); 25mm dark grey square rotated (5 degree) on a light grey background; surrounded by 20 nine-mm square grey scale patches. Notes: Ideal for evaluation response of digital systems to the slanted sharp edge function and used for MTF analysis. For full description, see QA-62 Product specifications. Part No. QA-62-SFR-P-RP ST-51 EIA HALFTONE GRAY SCALE Overall Size 95 x 76mm (3.75 x 3in) Material RP - photo paper Data: The EIA grayscale pattern is a standard 2" square projection slide. It contains two parallel gray scales. The upper scale has nine nominally equal transmission steps while the lower contains the same number of nominally equal density steps. The transmission values range from 3% to 60%, corresponding to density values of 1.52 and 0.22 respectively. The slide is chrome on glass and densities are achieved by a fine halftone pattern. Densities can be found here. Part No. ST-51-CG Overall Size 50mm x 50mm ST-52 ISO DIGITAL CAMERA CONTRAST CHART Material Reflective Material Data: This Camera Contrast Chart conforms to International Standard ISO-14524, Photography - Electronic Still Picture Cameras - Methods for Measuring Opto-Electronic Conversion Functions (OECF). Notes: Chart features 12 gray levels on a durable material. Densities range from 0.10 to 2.30. Part No. ST-52-RM Overall Size 356mm x 200mm Material Reflective Material 280 of 451
Imatest Documentation ISO-15739 Noise target 20-patch OECF targets (circular) ITE Grayscale Details on the I3A.org ISO Tools dowload page, particularly the ISO 15739 Noise Test Chart Utility Several charts use this 20-patch arrangement. (upper) Portion of proposed low-contrast ISO 12233 chart When OECF 20-patch circular is selected in the input dialog box (below), one of the following chart contrasts should be selected in the box just below the OECF 20-patch radio button. TE 241 Available from Image Engineering/Esser Test Charts. Transmissive chart. 12600:1 contrast ratio. 0 ≤ density ≤ 4.1 Low contrast 20:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 1.4 Standard reflection 80:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 2.0 Normal contrast 160:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 2.3 High contrast 1000:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 3.1 (lower) Esser Test Charts TE241 Instructions for Applied Image/ISO charts Comes in two versions: Type I: gamma = 0.45 and Type II: gamma = 1.0. Available from DNP (Japan), Zonetech (Korea), and Image Engineering/Esser Test Charts (Germany), where it is designated TE 83 and TE 84. When ITE Grayscale is selected in the input dialog box (below), either ITE Grayscale I: gamma = 0.45 or ITE Grayscale II: gamma = 1.0 should be selected in the box just above the ITE Grayscale radio button. Run Stepchart in the usual manner by clicking on Stepchart in the Imatest main window. Select the approximate crop region, which should include the grayscale patches and no more. Ignore any crop or selection marks. The crop does not have to be accurate; a find adjustment dialog box will appear later. If the crop aspect ratio is less than 3:1, Stepchart recognizes the chart as one of the Applied Image/ISO charts. Cropping illustration for the five targets The initial crop should include the grayscale patches and no more. It does not have to be accurate: after the chart type is selected,a fine adjustment dialog box appears. QA-61 ISO- 16067-1 Scanner QA-62 ST-51 EIA Grayscale ST-52 ISO-14524 12-patch OECF target ISO-15739 Noise target 281 of 451
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