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1. Click START and the SHIL Section Information screen will appear (Fig. Figure 18).
2. Scan the section barcode from the endcap
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Gamma: a digital camera setting that controls the grayscale reproduced on the image. An image gamma of unity (FigFigure. 19 missing) indicates that the camera sensor is precisely reproducing the object gray scale (linear response). A gamma setting much greater than unity results in a silhouetted image in black and white.
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- Color Standard values vary based on the standard and the manufacturer of the standard. Verify the values of the MacBeth Color Standard (multi color squares on the 3D standard, Fig. Figure 20) before starting (How do we do this?). Check the grayscale card to determine what the percentage of gray. The target calibration values will vary based on the percentage of gray because the target values depend on the percent grayscale card. Max RGB value is 255. If using a 50% grayscale card, target red and green value is 127, a 25% grayscale card target value is 64, etc. For our QP 101 v4 card, the RGB values are 235, 111, and 80 (Fig. ##Figure 21). All SHIL calibration standards are found in drawer PP-2B.
- Set camera f/stop to 22 (Fig.Figure 22). F/22 is preferred for standard scanning with the current light set up; F/16 is also acceptable. For hard rock cruises, where 360° whole round scanning is required, a larger F/stop number is required.
- If you haven’t set the camera’s height, now is the time to do so! See the section Camera Height Adjustment at the end of the calibration section.
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Figure 20: 3D standard with MacBeth Color standard.
Figure ##21: QP card 101 v4 grey scale standard.
Figure ##22: Setting the F Stop on the Camera.
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b. The speed (Fig. ##Figure 23) of the camera will be in the first box. If the values need to be changed to match the requested values by the science party, please proceed to the calibration section below as you will need to do a full calibration. If the values match, close the ‘Image Scan Setup’ window and proceed with the following checks.
Figure ##23: Checking the Image Scan Speed.
3. Check the trigger interval rate to see if the values are suitable for the scan rate.
- Click on Instruments and open the JAI Camera Set-up window.
- Turn the lights off IMMEDIATELY by clicking Lights OFF (Fig. ##). Remember the lights produce a lot of heat and can cause damage to anything underneath them if they remain stationary for too long.
- Click Rates and Exposure tab (Fig. ##Figure 24)
- Check that the Max Image Scan Speed is equal to, or slightly less than the designated Scan Rate.
- Again, if the values need to be changed to match the requested values by the science party, please proceed to the calibration section below. If the values match, close the JAI Camera Set-up window and proceed.
Figure ##24: Checking the Max Image Scan Speed.
Assess the SHIL scan
Prepare the scan to assess the current image correction values. If you can achieve a good image by either adjusting, or better yet, keeping the same, values in the following steps, you will not need to adjust any of the camera settings in the JAI Camera Set-up window in the calibration instructions below (Calibration section).
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1. Place the 3D calibration standard on track as shown (Fig. ##Figure 25). The color squares must be oriented as pictured below, butted against the red reflection bar.
Figure 20 25: Color standard in track in correct orientation.
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3. Scan the STND Color label (Fig. ##Figure 26b). Check the ColorChecker Standard box (Fig. ##Figure 26a). With this box selected no corrections are applied to the image so we are able to assess the raw image quality.
Figure 2126: Left, a) sample information screen with ColorChecker box checked. Right, b) standard barcode being scanned.
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6. On the main IMS panel select Instruments and Camera: Image Correction (Fig. 22Figure 27).
Figure 2227: Image Correction command selection.
7. Select Open Test Image and select the image you just took (Fig. 23Figure 28-1), C:/DATA/IN/IMAGE. It does not matter if the JPEG or TIFF file is loaded. The image loads into both the Original and Corrected windows. - at this point not tested to confirm it doesn't matter if a jpeg is loaded and used to perform the tiff correction.
Figure 2328: Image Correction Window. Steps are indicated in the figure.
8. Draw a ROI box loosely around the color checker in the Original box (Figure 28-2)
9. Click Crop (Figure 28-3).
10. as illustrated above, then click Crop. Draw another ROI box around the Color Checker squares and this time making sure to only have MacBeth colorchecker in the box. White squares will appear inside each square. Adjust the box to get those white squares close to the center of the color squares. Do not click Crop again.
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The main Image Correction window displays three main areas (Fig. ##Figure 29):
A. Graph panel: Main graphical viewing area on the left side of the screen.
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Instructions: Shows instructions to follow in this window.
TIFF Correction Check
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1. Click TIFF Correction Mode (Figure 29-2).
2. Click Uncorrected Image tab (Figure 29-3). This graph shows the measured red, green, and blue values of the gray scale color squares.
3. Click TIFF Correction tab to adjust the shape of the graph (Figure 29-4). The goal is to have line as straight as possible.
4. In the Tiff Correction tab adjust the LUT polynomial order values for the Red, Green, and Blue channels (Figure 29-5). Adjust these values to create the lowest residual error with the smoothest curve in the Uncorrected Image tab. Values Poly values should be around 4. Make sure that the curve does not wave about. If it does the order values need to be lowered. Also check that the corrected ROI and MacBeth values should be very close. Make sure that the white does not exceed the MacBeth value. If you are unable to produce a reasonable correction curve, it is necessary to redo your white balance correction in the Calibration section below. (see TIFF corrections cheat sheet in SHIL lab notebook, to be added).
Figure ##29: Steps for Tiff Correction illustrated on image. 1. Redraw box on color squares. 2. Select Tiff Correction Mode. 3. Put graph on Uncorrected Image. 4. Select Tiff Correction to view polynomial order. 5. Adjust polynomial order. 6. Check graph for linear relationship.
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Note: the TIFF correction is applied to both the TIFF and JPEG image but for the JPEG image you can also apply a Brightness, Contrast and Gamma (BCG) correction (See JPEG Correction section below). This is done at the photographer’s discretion. With better balanced LEDs on the new light system you may not have to use the BCG corrections (leave the values at their mid-points).
JPEG Correction Check
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In JPEG correction you will check and adjust if necessary the brightness, contrast and gamma (BCG) of the image. Situations may also arise where a JPEG correction should be applied. In the instance of very white or very dark cores, the TIFF images may look good but the JPEG images may look washed out or too dark to view details. JPEG corrections do not alter TIFF image settings.
1. Click JPEG Correction Mode Mode (Figure 30-1)
2. Click Applied Corrections tab (Figure 30-2)
3. Click JPEG Corrections tab (Figure 30-3). Adjust the Brightness, Contrast, and Gamma levels to achieve a straight line in the Applied Corrections tab and the ROI Corrected box should have values near 250 for the white square (is this correct or should they be 235). We want a linear relationship between the measured and given values. Each BCG setting adjusts the line in different ways and there are many different ways to adjust the values to achieve a linear relationship. You want to achieve a good image with good brightness, where the image has good saturation and not too washed out. (see JPEG corrections cheat sheet in SHIL lab notebook, to be added). The Applied Corrections Graph should be a straight line and the ROI Corrected Box should have values near 250. These may change depending on the instance of extreme colors, extremely white or extremely dark cores, in which the settings may have be tweaked more to get a user friendly consumer image.
Figure 2530: Steps for JPEG Correction illustrated on image. 1. Select JPEG Correction Mode. 2. Select Applied Corrections tab on graph. 3. Select JPEG Correction to see Brightness, Contrast, and Gamma Corrections. 4. Adjust Brightness, Contrast, and Gamma corrections. 6. Check graph for Linear Relationship. 7. Check the boxes in the Color Checker and compare to RGB values in corrected image.
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1. Confirm the camera F-stop is set to 22 (Fig. ##Figure 31). F/22 is preferred for standard scanning with the current light set up; F/16 is also acceptable. For hard rock cruises, where 360°whole 360° whole round scanning is required, a larger F-stop number is required. See the Advanced SHIL Calibration (in developementdevelopment) for further information on F-stop.
Figure ##31: Setting the F Stop on the Camera.
2. In the IMS control panel select Motion and then Drive Disable from the dropdown menu (Fig. ##Figure 32). You will have to move the camera by hand for the calibration, disabling the motor allows manual movement of the camera on the track.
3. In the IMS control panel click Instruments > JAI Camera Settings (Fig. ##Figure 33). The lights turn on automatically when the JAI Camera Setup window opens
4. Click Lights OFF (Fig. ##) IMMEADIATELYFigure 34) IMMEDIATELY. You can also turn the lights off with the physical power switch located behind the monitor (Fig. ##). Note if the lights are turned off by the hardware switch, the lights cannot then be turned on the software command.
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