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Step B -- Stitch the remaining rows

In this step, you stitch the remaining rows of images into horizontal panoramas that are parallel to the first row.  If all goes well, these rows will match the spherical coordinate system of the first row.  Repeat these steps for all of the rows.

  1. Choose the Show imported images command (View menu) to display the imported thumbnails in the lower pane.

  2. Select the thumbnails for the row and choose the Stitch with the Wizard command (New image menu).

  3. This time, remove the checkmark from Automatically detect focal length and then choose I am certain of the focal length on Wizard 3/9. This guarantees all rows are stitched with the same focal length setting (the first stitch sets the Wizard value to the detected focal length).

  4. Advance to Wizard 6/9 and place stitching points on one image pair as you did for the first row.  As before, I recommend this procedure for placing stitching points:

    • Place stitching points on one image pair. I recommend using distant points and/or points all in the same plane.

    • After placing 5 points, you should get a dot in the Images list.

    • Once you have the image dot, go back to each stitching point in turn and examine them at large zoom scale (400% or 500%).  Adjust the stitching points so that they match well on the two images.

    • Repeat this procedure for all image pairs.  It's important to get a dot in the images list for each pair of images.

    The warped images will be wider on the top or the bottom, depending upon whether the row is above or below the center, making a keystone shape for smaller tilt angles or a mushroom shape for larger tilt angles.  This is normal.  The degree of keystoning or mushrooming will depend upon the tilt angle you used for the upper row.

  5. Advance to Wizard 7/9. As in the first row, you'll use the warping grid to correct the manual stitch to be level and square.  For more information about the warping grid, refer to the section "Wizard step 7/9 Preview at low resolution" in Chapter 1 of the online help.

    When you first enter this Wizard step, it will show you the results of the manual stitch before applying the warping grid.  In our example, the image is rotated clockwise from level.

  6. Find the horizontal line you used as a reference in row 1.

    In our example, we selected one of the horizontal lines between sections of window glass.  Use the "horizon method" as described in the section "Wizard step 7/9 Preview at low resolution" in Chapter 1 of the online help to place three handles (red dots) on the horizontal line. 

    I recommend placing the handles on the same three points that you used in the first row.  Using the same three points for both rows will guarantee that the two rows are warped consistently.  Refer to Detailed view of handle placement to see exactly where the handles are placed in this example.

    After placing the three handles, click Apply warp.

  7. Examine the preview image.  After applying the warp, the horizontal line you chose should be perfectly straight and level.   If not, adjust the warping grid until you are satisfied. There is no loss of image quality if you apply the warping grid multiple times because the image is recomputed from the original image data each time you rewarp.

  8. Advance to Wizard 9/9 to complete the stitch and click Done to exit the Wizard.  At this point, you should have a stitched thumbnail and a cropped thumbnail for each row in the upper pane.  The most recent cropped image should appear in the lower pane.

  9. FOR THE BOTTOM ROW ONLY:  When you stitch the bottom row (if it was not the first row you stitched), choose the Panoramic properties command (Image menu).  Write down the Below value from Vertical field of view (degrees) in the Panoramic image properties dialog box.  We'll need this value in a later step.  We'll refer to it as StepAB_Below.

  10. Click Cancel to close the Panoramic image properties dialog box.

Advance to Step C -- Rotate the cropped images 90 degrees clockwise

Back to Step A -- Stitch the first row

Up to The list of the major steps


Revised: January 11, 2007

Text  2007 Smoky City Design, LLC and John Strait
Photos 2006 Stephen Wateridge, used with permission