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- Speed: This is the speed in cm/sec the camera moves while measuring the section. This speed must be set lower than the speed determined by the Camera Calibration (can it also be equal to the Max Image Scan Speed in the Calibration?).
- Acceleration: The rate in cm/sec the camera ramps up to when not measuring a section.
- Deccelaration: The rate in cm/sec the camera will slow down when not measuring a section.
- Start Position: This is the position the imaging begins. Note it will be a negative number. The top of the core starts at 0 cm in order to image the standard gray-scale card in front of the core, that location will be negative.
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Preparing the SHIL for imaging cores requires adjusting the light system height and calibrating the camera (applying corrections). The position of the lights once set should be stable through out the expedition unless changes are needed for variations in core height (hard rock versus sediment versus 360 imaging). The technical staff will calibrate the camera settings when ever the light source is moved or unwanted artifacts are present in the images.
Setting up the Lights (Section for old lighting system, delete when new lighting system is approved)
Initial light installation and fine adjustment procedures are described in the SHIL: Light Array AUG. For routine operation, follow these steps:
- Rotate the lights to the desired rough angle to the camera (usually ~30° to the camera axis for sediment cores). Fine-tune the light position by observing the camera output using MAX.
- Manually turn on one line light at a time to full power by pressing the "+" button on the light controller until you reach 100%.
- Loosen the brackets on both sides of the light mounts and make small position adjustments until the brightest image is achieved.
- Turn off the light by pressing the "–" button and press Select to enable the other light.
- Repeat Steps 2–4 for the second light.
Calibration
The laboratory technician calibrates the system when needed by adjusting camera settings and analyzing an imaged QP 101 V4 Color Standard. The current light system obtains nearly uniform illumination intensity from the core’s surface (half or whole round) to the bottom of the liner by a combination of high intensity, overlapping large diameter light source, close coupling to the imaged surface and the “line” image plane. The bottom edge of the brass led mount should be set between 2 and 4cm from the image surface. For uneven hard rock cores the height can be set higher but illumination intensity will drop, exposure times lengthen, f-stop opened and scanning speed reduced. Note, any height change to the lights requires re-calibration. Heat is removed from the LEDs and transferred to the surrounding air via the copper heat pipes. While these to get hot they are not a burn hazard. However they are very delicate and bend at the slightest touch, so use care when working with the camera lens. For more detailed information on the theory behind the calibration please refer to the Advanced SHIL Calibration (in development).
Note: the following instructions are devided divided into 2 sections. Calibration Check and Calibration.
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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, 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 (Figure 21). All SHIL calibration standards are found in drawer PP-2B.
- Set camera f/stop to 22 (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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The following three steps in Calibration Check are designed for technicians to check the SHIL’s calibration. The calibration check is required to be done at the start of every expedition prior to receiving the first core. If adjustments to the calibration are needed, please see the Calibration section below.
Determine the
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Scan Rate for the
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Expedition
1. Talk to your science party to determine what scanning parameters (scan rate) they wish to use. A typically scan rate has been between 8-10 cm per second. Note, with the new, brighter LED lighting system, faster scan rates can be achieved compared to expeditions prior to Expedition 390C.
2. Compare the current scan rate to the requested rate.
a. 1. Launch IMS on the SHIL computer
b2. Click on DAQ and click Image Capture Motion Setup
b3. Compare the current scan rate (Speed) to the requested rate. The speed Speed (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.
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Figure 23: Checking the Image Scan Speed.
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Check the Line Trigger Interval rate
The Line Trigger Interval dictates the Max Image Scan Speed.
1. 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.
2. Turn the lights off IMMEDIATELY by clicking Lights OFF. Remember the lights produce a lot of heat and can cause damage to anything underneath them if they remain stationary for too long.
3. Click Rates and Exposure tab (Figure 24)
4. Check that the Max Image Scan Speed is equal to, or slightly
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more than the designated
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scan rate (Speed).
5. 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).
Take an Image
1. Place the 3D calibration standard on track as shown (Figure 25). The color squares must be oriented as pictured below, butted against the red reflection bar.
Figure 25: Color standard in track in correct orientation.
2. Open IMS and Click Start.
3. Scan the STND Color barcod label (Figure 26b). Check the ColorChecker Standard box (Figure 26a). With this box selected no corrections are applied to the image so we are able to assess the raw image quality.
Figure 26: a) sample information screen with ColorChecker box checked, b) standard barcode being scanned.
4. Click Take A Picture.
4. Click Take A Picture.
5. 5. When the image has finished click Crop and then Save. We use the uncropped image so the crop here is not important.
Figure 26: a) sample information screen with ColorChecker box checked, b) standard barcode being scanned.
6. On the main IMS panel select Instruments and Camera: Image Correction (Figure 27).
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Figure 27: Image Correction command selection.
7. Select Open Test Image and select the image you just took (Figure 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 28: 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. 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.
Check TIFF and JPEG Corrections
Here we check and can adjust our TIFF and JPEG Corrections. You may find you only need to slightly tweak the values and the calibration is good. However if the image appears streaky, a physical change has happened to the Camera or lights, the RGB values between corrected and expected are far off, or the graphs of either the tiff or jpeg don't look good, you will need to re-calibrate following the full calibration discussed below.
The main Image Correction window displays three main areas (Figure 29):
A. Graph panel: Main graphical viewing area on the left side of the screen.
Uncorrected Tab: Shows the measured Red, green, and blue values of the gray scale color squares.
Applied Corrections Tab: Applies polynomial fit corrections to the RGB lines.
B. Image Viewing Panels: Area in upper right portion of the screen that displays the original and corrected test image and color checker with RGB values.
Original: Displays the uploaded tiff.
Corrected: Displays the uploaded tiff with corrections applied.
Color Checker: Displays the known values of the MacBeth Color Checker values
C. Correction Panel: Panel in the lower right portion of the screen that allows user to apply corrections to the image
TIFF Correction: Shows tiff red, green, and blue polynomial fit.
JPEG Correction: Shows brightness, contrast, and gamma settings.
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The main Image Correction window displays three main areas:
A. Graph panel: Main graphical viewing area on the left side of the screen.
Uncorrected Tab: Shows the measured Red, green, and blue values of the gray scale color squares.
Applied Corrections Tab: Applies polynomial fit corrections to the RGB lines.
B. Image Viewing Panels: Area in upper right portion of the screen that displays the original and corrected test image and color checker with RGB values.
Original: Displays the uploaded tiff.
Corrected: Displays the uploaded tiff with corrections applied.
Color Checker: Displays the known values of the MacBeth Color Checker values
C. Correction Panel: Panel in the lower right portion of the screen that allows user to apply corrections to the image
TIFF Correction: Shows tiff red, green, and blue polynomial fit.
JPEG Correction: Shows brightness, contrast, and gamma settings.
Instructions: Shows instructions to follow in this window.
7. Select Open Test Image and select the image you just took (Figure 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.
8. Draw a ROI box loosely around the color checker in the Original box (Figure 28-2)
9. Click Crop (Figure 28-3).
10. 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.
Figure 28: Image Correction Window. Steps are indicated in the figure.
Check TIFF and JPEG Corrections
Here we check and can adjust our TIFF and JPEG Corrections. You may find you only need to slightly tweak the values and the calibration is good. However if the image appears streaky, a physical change has happened to the Camera or lights, the RGB values between corrected and expected are far off, or the graphs of either the tiff or jpeg don't look good, you will need to re-calibrate following the full calibration discussed below.
TIFF Correction Check
1. Click TIFF Correction Mode (Figure 29-2).
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