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Imatest Documentation 20-patch OECF targets ITE Grayscale The dialog box shown below appears. The cropped input image is shown on the right. Select the appropriate chart type using the radio buttons in the middle. The image on the left illustrates the chart type: the patches should match the input image on the right. You can change the title if needed. You can select a file for reference density values if you choose not to use the standard values. The file should contain patch densities, one per line. The patch order is given below. The scaling box affects the x-axis and noise plots in Figures 2 and 3. It is identical to the standard Stepchart input dialog box. If you choose OECF 20-patch circular, choose one of the contrast settings listed in the above table. If you click OK , the fine ROI selection box, shown below appears. You can move the entire ROI using one of the buttons on the top left: ^ , v , < , or > . You can move the top margin with T ^ or T v , the bottom margin with B ^ or B v , etc. Corners can also be adjust individually: useful in the presence of perspective or lens distortion. Author's note: I would have liked to be able to click and drag on lines or corners, but the limitations of the Matlab interface didn't allow this. 282 of 451
Imatest Documentation You can enter X and Y values for the corners (tl = top left, etc.): be sure to press Enter for each value if you do. The size of the selection is shown on the lower left. Fill factor (linear) (on the lower right, just above No, Try again ) sets the size of the squares. It defaults to 0.7. It can be increased to obtain more samples for noise analysis, but it may need to be reduced if the image is tilted or distorted. The Distortion slider allows highly distorted (barrel or pincushion) images to be analyzed. Fill factor may have to be reduced in the presence of extreme distortion. When the squares have been adjusted, click Yes, Continue , No, Try again , or Cancel . The Output is the same as for standard linear step charts. Patch order for the five targets The table below shows the patch order for the targets. Use this order when creating a custom density file. 1 2 3 4 5 6 20 7 19 8 18 9 17 10 16 15 14 13 12 11 QA-61 ISO- 16067-1 Scanner 3 1 2 5 4 7 6 9 8 11 12 10 ISO-15739 Noise target Orientation and numbering of patches for monochrome targets 1 2 3 4 5 6 20 7 19 8 18 9 17 10 16 15 14 13 12 11 QA-62 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 19 20 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ST-51 EIA Grayscale 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 20-patch OECF targets ITE Grayscale 1 2 3 4 5 6 7 8 9 10 11 12 ST-52 ISO-14524 OECF target 283 of 451
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