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Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

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Matlab Toolbox for Panorama Image Processing

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GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

Repository files navigation

Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

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Resources

Stars

93 stars

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1 watching

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

Repository files navigation

Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

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93 stars

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1 watching

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

Repository files navigation

Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

Topics

Resources

Stars

93 stars

Watchers

1 watching

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

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Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

Topics

Resources

Stars

93 stars

Watchers

1 watching

Forks

Releases

Packages

Used by

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

Repository files navigation

Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

Topics

Resources

Stars

93 stars

Watchers

1 watching

Forks

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' GitHub - yindaz/PanoBasic: Matlab Toolbox for Panorama Image Processing · GitHub
Skip to content

Repository files navigation

Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

About

Matlab Toolbox for Panorama Image Processing

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Resources

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93 stars

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1 watching

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Toolbox for panorama image processing

This toolbox provides useful functions to process panorama images. Please see Quick start below for details.

If using this code as parts of your project, please cite:

Y. Zhang, S. Song, P. Tan, and J. Xiao
PanoContext: A Whole-room 3D Context Model for Panoramic Scene Understanding
Proceedings of the 13th European Conference on Computer Vision (ECCV2014)

@article{zhang2014panocontext,
title={Panocontext: A whole-room 3d context model for panoramic scene understanding},
author={Zhang, Yinda and Song, Shuran and Tan, Ping and Xiao, Jianxiong},
booktitle={European Conference on Computer Vision},
pages={668--686},
year={2014},
organization={Springer}
}

If you have any question about the code, please feel free to contact: Yinda Zhang, yindaz at gmail.

Quick start:

Run demo_full.m to see an "almost" complete list of functions in this toolbox. Some (not all) featured functions are:

  • Combine perspective images to a panorama.
  • Project a region on panorama to a perspective image.
  • Line segment detection.
  • Color segmentation.
  • Find vanishing point.
  • Reconstruct 3D cuboid.

For a full list of functions, please see instruction.pdf.

Matterport3D support:

Run demo_matterport.m to see how to stitch panorama for Matterport3D dataset. Note that:

  • If you wish to have seamless good looking color panorama, you should stitch skybox images.
  • If you wish to have aligned color and depth panorama, you should stitch undistorted_color/depth_images.

If you stitch from undistorted_color/depth_images:

  • The color panorama from undistorted_color_images may contain visible artifacts near stitching boundaries because of different exposure between images.
  • The demo only takes the 6 horizontal views as example, and assumes 60 degrees between each pair of adjacent views. This may not be true in practice, and a perfectly accurate panorama stitching requires accurate calculation of (vx,vy) from camera extrinsic matrices.
  • Given more accurate (vx/vy) calculated for upward/downward looking views, you may stitch 18 views together for a more complete panorama.

FAQ:

Q: Windows users will get an error when calling function "lsdWrap.m".
A: The Windows command line does not support '/'. Please change all '/' in commands line to '\' before sending them to "system" function in Matlab.

License:

This toolbox is under the MIT License: http://opensource.org/licenses/MIT.

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