{"id":51,"date":"2022-05-01T05:19:45","date_gmt":"2022-05-01T05:19:45","guid":{"rendered":"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/?page_id=51"},"modified":"2022-12-18T19:37:07","modified_gmt":"2022-12-18T19:37:07","slug":"dataset-2","status":"publish","type":"page","link":"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/dataset-2\/","title":{"rendered":"Dataset"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>Need for Dataset Creation<\/strong><\/h3>\n\n\n\n<p>Different sets of images were provided by Komatsu of underground coal mines, but it had radial distortion present and the intrinsic parameters of the cameras used to capture those images are not available. These intrinsic parameters are required for Pose estimation problem and therefore, those images cannot be used. Thus, a need raised to create a dataset of images which would resemble the images captured in the coal mines of a mostly flat surface and whose intrinsic parameters are known.<\/p>\n\n\n\n<p>After Discussion, we arrived at Following setup:<\/p>\n\n\n\n<p>A set of 3 cameras with known radial distortion and intrinsic parameters are taken and placed 2-3 meters apart from each other. The cameras are placed in from of the Smith hall building and bike racks are placed in front of the wall to provide some depth in the scene and resemble coal mine images. Here are some sample images.<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\"><\/div><\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\"><\/div><\/div>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"120\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1-1024x576.jpg\" alt=\"\" class=\"wp-image-120\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1-1024x576.jpg 1024w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1-300x169.jpg 300w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1-768x432.jpg 768w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1-1536x864.jpg 1536w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img41-1.jpg 1920w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"118\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1-1024x576.jpg\" alt=\"\" class=\"wp-image-118\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1-1024x576.jpg 1024w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1-300x169.jpg 300w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1-768x432.jpg 768w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1-1536x864.jpg 1536w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img40-1.jpg 1920w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"119\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1-1024x576.jpg\" alt=\"\" class=\"wp-image-119\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1-1024x576.jpg 1024w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1-300x169.jpg 300w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1-768x432.jpg 768w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1-1536x864.jpg 1536w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/img42-1.jpg 1920w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Undistort Images<\/strong><\/h3>\n\n\n\n<p>As evident from the images above, there is presence of radial distortion as well as tangential distortion in the images. Presence of radial distortion creates a bulge in the image and straight lines look curved in the image. In presence of tangential distortion, the vertically straight surface appears to be slanted backwards. This can be better understood with the help of following image<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1015\" height=\"310\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image.png\" alt=\"\" class=\"wp-image-122\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image.png 1015w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-300x92.png 300w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-768x235.png 768w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><figcaption>Effects of image distortion<\/figcaption><\/figure>\n\n\n\n<p>The effects of distortion can be easily modelled using distortion coefficients:<\/p>\n\n\n\n<p>For Radial distortion:<br>One common model for radial distortion is the &#8220;radial polynomial&#8221; model, which is expressed as follows:<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"456\" height=\"125\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-1.png\" alt=\"\" class=\"wp-image-131\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-1.png 456w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-1-300x82.png 300w\" sizes=\"auto, (max-width: 456px) 100vw, 456px\" \/><\/figure><\/div>\n<\/div>\n<\/div>\n\n\n\n<p>In this equation, <strong>x, y<\/strong> are the coordinates of a point in the undistorted image, and <strong>x <sub>distorted<\/sub>, y<sub>distorted<\/sub><\/strong> are the coordinates of the same point in the distorted image. The variable <strong>r <\/strong>is the distance from the center of the image, and  <strong>k<sub>1<\/sub>, k<sub>2<\/sub>, k<sub>3<\/sub> <\/strong>are constants that describe the amount of distortion.<\/p>\n\n\n\n<p>This model is usually used to correct for radial distortion by finding the values of <strong>k<sub>1<\/sub>, k<sub>2<\/sub>, k<sub>3<\/sub> <\/strong>that minimize the distortion in the image. Once these values have been found, the inverse of the above equation can be used to map points in the distorted image back to their undistorted positions.<\/p>\n\n\n\n<p>For Tangential distortion:<br>One common model for tangential distortion is the &#8220;tangential polynomial&#8221; model, which is expressed as follows:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"456\" height=\"110\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-2.png\" alt=\"\" class=\"wp-image-132\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-2.png 456w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-2-300x72.png 300w\" sizes=\"auto, (max-width: 456px) 100vw, 456px\" \/><\/figure><\/div>\n\n\n\n<p>In this equation, <strong>x, y<\/strong> are the coordinates of a point in the undistorted image, and <strong>x <sub>distorted<\/sub>, y<sub>distorted<\/sub><\/strong> are the coordinates of the same point in the distorted image. The variable <strong>r <\/strong>is the distance from the center of the image, and  <strong>p<sub>1<\/sub>, p<sub>2<\/sub> <\/strong>are constants that describe the amount of distortion.<\/p>\n\n\n\n<p>This model is usually used to correct for tangential distortion by finding the values of <strong>p<sub>1<\/sub>, p<sub>2<\/sub> <\/strong>that minimize the distortion in the image. Once these values have been found, the inverse of the above equation can be used to map points in the distorted image back to their undistorted positions..<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Results of Distortion Removal<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"289\" src=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3-1024x289.png\" alt=\"\" class=\"wp-image-133\" srcset=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3-1024x289.png 1024w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3-300x85.png 300w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3-768x217.png 768w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3-1536x433.png 1536w, https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/wp-content\/uploads\/sites\/67\/2022\/12\/image-3.png 1659w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><figcaption>        Before                                                                                                                         After <br>The payment edge looks straighter and window looks in vertical plane after undistortion<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Need for Dataset Creation Different sets of images were provided by Komatsu of underground coal mines, but it had radial distortion present and the intrinsic parameters of the cameras used to capture those images are not available. These intrinsic parameters are required for Pose estimation problem and therefore, those images cannot be used. Thus, a &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/dataset-2\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Dataset&#8221;<\/span><\/a><\/p>\n","protected":false},"author":123,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-51","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dataset - Multi-Camera Pose Estimation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mscvprojects.ri.cmu.edu\/2022team12\/dataset-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dataset - Multi-Camera Pose Estimation\" \/>\n<meta property=\"og:description\" content=\"Need for Dataset Creation Different sets of images were provided by Komatsu of underground coal mines, but it had radial distortion present and the intrinsic parameters of the cameras used to capture those images are not available. 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