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Panorama

This module enables you to create overview images of large areas of your sample.

Prerequisites

For the interactive panorama acquisition following prerequisites are necessary:

  • All available microscope components in the MTB (MicroToolBox) have to be defined correctly.
  • You have licensed this functionality and activated it under Tools > Toolkit Manager.

Acquiring a Reference Image

Before starting the experiment itself, we recommend tthat you first take a reference image for the shading correction. This image will be used later for processing the panorama image.

  1. Move the sample to an empty field.
  2. Ensure that the field of view is absolutely free of any structures (dirt); as this would cause errors in the images acquired later. If necessary, slightly de-focus the sample to suppress these structures.

  3. Click on the Snap button to acquire this position as reference image.
  4. Save the image and let it open in the background.
  1. You have successfully acquired a reference image for the shading correction.

Settings for a Panorama Experiment

  1. You are on the Acquisition tab.
  2. You have started the live mode via the Live button.
  1. Activate the Panorama checkbox.
  2. Move the sample to the desired start field of the panorama image to be acquired.
  3. Check the defined exposure time again if necessary.
  4. In the Display tab you can adjust the Display curve to avoid over-exposures in your images.
  5. In the Imaging Setup tool, you can check the settings before/after the experiment.
  6. The Advanced Imaging Setup is only displayed if you have activated the Enable Advanced Imaging Setup checkbox under Tools > Options > Acquisition > Acquisition Tab > Enable Imaging Setup.
  7. In the Acquisition Mode tool, click the Get button to transfer the active camera settings into the experiment.
    As an alternative you can define your experiment settings here as well.
  8. In the Panorama tool you can adjust several options for automatic or manual stitching if desired.
  9. Finally save your experiment with a suitable name in the Experiment Manager.

Acquiring a Panorama Image Automatically

The field of view of your microscope might be too small for the sample area you wish to acquire. You can automatically visualize panorama images from a sample area which is larger than the camera sensor can cover by means of a single snap.

With the Live Panorama tool, you can move the stage while the software automatically acquires individual images, stitches them together and creates a panorama image.

Note that Live Panorama works for un-coded and un-motorized stages as well as motorized stages.

  1. You have set-up and configured your microscope system correctly.
  2. You work with brightfield or widefield illumination.
  3. Your image has sufficient contrast. Lower magnification objectives typically give better results.
  4. A sample is on the stage and stays in focus. Note that you can adjust the focus during the Live panorama.
  5. You have started the software and selected the Locate tab. If you work with an LSM, activate camera mode.
  1. On the Locate tab, click the Live button to get a live image from the microscope camera. Adjust the camera and microscope settings to see a well illuminated and sharp live image.
  2. Navigate to a specific area on your sample you want to image.
  3. Move the stage gently and not too fast!
  4. Select the Live Panorama tool, and click the Start Live Panorama button.
  5. After a short moment, the camera rectangle changes to green and you can move the stage. The panorama acquisition starts. You see the live image of the sensor area.
  6. Note that the color of the rectangle changes to orange or red, when the software loses the stitching algorithm. This might happen if the stage is moved too quickly. Then you have to manually go back to the last known or successfully synchronized position. If you wish to image a continuous area of the sample without any gaps, we recommend using a zig-zag pattern to move over your sample to slowly build up the image.


  7. Move the stage slowly in the desired direction.
  8. During the stage movement the software automatically acquires the panorama image.
  9. To finish the acquisition, click Live Panorama tool > Stop button.
  10. A message is displayed, prompting you to decide if you want to generate an image pyramid to optimize the later display of your image.
  11. Click Yes.
  1. The panorama image is added to the Documents tab > Images and Documents tool.
  2. Stitching artifacts can be corrected by making sure the camera rotation has been corrected. You can make use of the stitching image processing function to correct them.
  3. You can save the image to your file system.

Processing a Panorama Image

The next chapters will show you how to process panorama images with the Stitching processing function. Using this method you can correct an offset between the tile images. We will show you the different settings and make a comparison of the output images. So you can see which settings will give you the best result.

Prerequisites

  1. You are on the Processing tab.
  1. Open the Method tool and select in the group Geometric the Stitching function.
  1. The following instructions are all based on this selection and show the different settings and results of this function.

Stitching (Defaults)

  1. In the Method tool open the Geometric group.
  2. Select the Stitching function.
  3. Click on the Apply button in the Processing tab to start the processing.
  4. The stitching process will take a while depending on the image size.
  5. In the Status bar you can see the work in progress.
  1. You have successfully used the Stitching function. As you still can see shadows and edges in the output image, we will show you how to use the function receiving better results in the following chapters.

Stitching with Shading Correction

If your tile images contain a certain background shading, you can correct this if you have acquired a reference image for the shading correction. This image has to be opened in the Center Screen Area.

  1. Select in the tile image for the stitching in the Input tool as first input.
  2. In the Parameters tool select the New Output button.
  3. This will keep the original image and create a new output image.
  4. Activate the Correct Shading checkbox.
  5. Select the Reference entry from the dropdown list.
  6. This will let you select your reference image which is opened in Center Screen Area.
  7. If you do not have any image available for the shading correction, you alternatively can calculate a background image from the input image via the second selection Automatic under Correct Shading. This will only work, if your input image does not include large dark regions.

  8. Now as a second input image select the reference image for the shading correction in the Input tool.
  9. Click on the Apply button to start the processing.
  1. As a result you will get a stitched panorama image without any shading influences. The next chapter will show you how to get rid of the edges which are still visible between the tiles.

Image Comparison via Split Display

You can create a Multi Image to compare the different results of your processed images via the Splitter-Mode.

  1. To compare different images, you can select the Split Display via the Create New Multi Image button.
  2. On the Split Display tab you can define how many images shall be displayed in X- and Y-direction aside each other and how they shall be synchronized, e.g. 2 Columns and 2 Rows.
  3. Move each of the different panorama images via drag&drop from the Right Tool Area > Images and Documents gallery to an empty frame in Center Screen Area.
  1. In our example we show the transition areas of the tile image as raw image (top left), as fused tile image (top right), as shading corrected tile image (bottom left) and finally the combination of shading correction and fused tiles (bottom right). In this last image no transitions between the tiles are visible anymore.

Panorama Tool

Here you can adjust settings for the panorama acquisition.

After you have acquired the single tile images simply activate the Perform stitching after the experiment checkbox. If you want to stitch the images manually, click on the Perform Stitching button, after you have finished the experiment.

The panorama acquisition itself is performed interactively via in the Panorama view. If you click on Start Experiment' the Panorama view opens and you can start to acquire the single tile images.

Panorama View

In this view you see the representation of the microscope stage. The Live image from the camera (blue frame) is automatically shown in the middle of the image area. Furthermore a tool window is displayed, that allows you to control the image acquisition, e.g. perform auto exposure or acquire an individual tile image.

Tools Window

The tool window for panorama view is normally visible in the lower right corner of the center screen area. It becomes active if you move the cursor over it. You can use it to set acquisition parameters and acquire tile images for your panorama image.

Parameter

Description

Center to Live Navigator

Centers the stage view at the current position of the Navigator frame.

Action Buttons

With the three action buttons (Live, Set Exposure, Continuous) you're able to control acquisition parameters like you are used to do it on the Acquisition tab.

Acquire Tile Image

Acquires a tile image. This comprises all activated channels as well as Z-stacks. After the acquisition, the tile image is placed in the corresponding location in the stage view.

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