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How to stitch dual fisheye to equirectangular images

Converting dual fisheye images to equirectangular format is essential for creating seamless 360-degree panoramas suitable for viewing on platforms like

Here’s a simple step-by-step guide on how to achieve this conversion using popular software tools.

Step 1: Choose Your Software

While hosts and displays 360-degree panoramas, it does not convert fisheye images directly. You will need to use software capable of stitching such images into an equirectangular format. Popular options include:

  • PTGui: Highly recommended for its powerful features and flexibility.

  • Hugin: A free and open-source alternative that works well for basic needs.

Step 2: Prepare Your Images

Ensure your dual fisheye images are ready:

  • Resolution: Check that both images are of the same resolution.

  • Alignment: Ensure the images are correctly aligned (top-bottom or side-by-side) as per your camera's output.

Step 3: Import Images into the Software

  • PTGui: Go to File > New Project, and drag your images into the project window.

  • Hugin: Open Hugin, click on Load Images, and select your dual fisheye images.

Step 4: Set Control Points

Control points are critical for stitching. They help the software understand how to merge the two fisheye images.

  • PTGui: Automatically adds control points. You can manually adjust them by selecting Control Points tab and editing as needed.

  • Hugin: Also suggests control points automatically, but you can add or modify control points manually in the Control Points table.

Step 5: Choose Projection

Select the equirectangular projection to convert the fisheye images into a 360-degree panoramic view.

  • In PTGui: Select Equirectangular under the Projection settings.

  • In Hugin: Go to the Panorama Editor, and from the Projection menu, select Equirectangular.

Step 6: Stitch the Panorama

Once everything is aligned, stitch the images together.

  • PTGui: Click on Align Images, and after the alignment is complete, click on Create Panorama.

  • Hugin: Click on Align, and once done, click on Create panorama.

Step 7: Export and Upload

Save the stitched image in a compatible format (JPG or PNG) and at an appropriate resolution.

  • Upload the final equirectangular image to by logging into your account, going to the upload section, and selecting the image file.

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