{"id":1207,"date":"2023-01-05T08:57:11","date_gmt":"2023-01-05T07:57:11","guid":{"rendered":"https:\/\/au.feri.um.si\/losdv\/?page_id=1207"},"modified":"2023-02-15T13:53:31","modified_gmt":"2023-02-15T12:53:31","slug":"sar_obdelava_slik","status":"publish","type":"page","link":"https:\/\/au.feri.um.si\/losdv\/en\/sar_obdelava_slik\/","title":{"rendered":"SAR - Image Processing"},"content":{"rendered":"<p>In the Signal Processing and Remote Sensing Laboratory, we analyze Synthetic Aperture Radar (SAR) images. Radar images require a source of electromagnetic waves to be generated. SAR images are generated by sending a frequency-modulated signal from the source to the receiver. Radar images are used to detect changes, automatically extract information, determine movements, and detect soil moisture.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-1024x422.png\" alt=\"\" class=\"wp-image-1349\" width=\"768\" height=\"317\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-1024x422.png 1024w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-300x124.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-768x317.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-18x7.png 18w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17-360x148.png 360w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-17.png 1433w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><figcaption>Figure 1. Image of Maribor taken with the TerraSAR-X satellite in 2015 in RGB representation<\/figcaption><\/figure>\n\n\n\n<p>Change detection<\/p>\n\n\n\n<p>SAR images can be used to record the situation before and after an event. Based on the processing of both images, changes can be determined. Figure 2 shows a block diagram where we can estimate the height of an object before and after an event. An example was used in 2015 to estimate the height of forests.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-1024x402.png\" alt=\"\" class=\"wp-image-1425\" width=\"792\" height=\"311\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-1024x402.png 1024w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-300x118.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-768x302.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-18x7.png 18w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43-360x141.png 360w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-43.png 1444w\" sizes=\"(max-width: 792px) 100vw, 792px\" \/><figcaption>Figure 2. Block diagram of image processing for detecting changes in object height.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-1024x791.png\" alt=\"\" class=\"wp-image-1429\" width=\"765\" height=\"592\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-1024x791.png 1024w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-300x232.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-768x593.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-16x12.png 16w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46-350x270.png 350w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-46.png 1146w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><figcaption>Figure 3. Interferometric image from 2013 and 2014.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-1024x479.png\" alt=\"\" class=\"wp-image-1569\" width=\"768\" height=\"359\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-1024x479.png 1024w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-300x140.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-768x359.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-18x8.png 18w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-360x168.png 360w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image.png 1048w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><figcaption>Figure 4. Change detection<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"940\" height=\"316\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4.png\" alt=\"\" class=\"wp-image-1573\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4.png 940w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4-300x101.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4-768x258.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4-18x6.png 18w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-4-360x121.png 360w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><figcaption>Figure 5. Example of change detection in SAR images.<\/figcaption><\/figure>\n\n\n\n<p>Student Ultrasonic SAR Sensor<\/p>\n\n\n\n<p>We created an ultrasonic SAR sensor with students. We used ultrasound to generate a 50kHz frequency modulated signal and used SAR focusing.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5.png\" alt=\"\" class=\"wp-image-1574\" width=\"647\" height=\"387\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5.png 862w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5-300x180.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5-768x460.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5-18x12.png 18w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/02\/image-5-360x215.png 360w\" sizes=\"(max-width: 647px) 100vw, 647px\" \/><figcaption>Figure 6. Ultrasonic SAR sensor on rail<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" src=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-1024x768.png\" alt=\"\" class=\"wp-image-1423\" width=\"768\" height=\"576\" srcset=\"https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-1024x768.png 1024w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-300x225.png 300w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-768x576.png 768w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-16x12.png 16w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42-360x270.png 360w, https:\/\/au.feri.um.si\/losdv\/wp-content\/uploads\/sites\/4\/2023\/01\/image-42.png 1462w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><figcaption>Figure 7. Focused SAR image<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>V laboratoriju za obdelavo signalov in daljinska vodenja se ukvarjamo z analizo slik radarja z umetno odprtino ali ang. Synthetic Aperture Radar ali na kratko SAR. Radarske slike za svoj nastanek potrebujejo izvor elektromagnetnega valovanja. Slike SAR nastanejo s po\u0161iljanjem <a href=\"https:\/\/au.feri.um.si\/losdv\/en\/sar_obdelava_slik\/\" class=\"read-more\">Read More &#8230;<\/a><\/p>","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/1207"}],"collection":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/comments?post=1207"}],"version-history":[{"count":7,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/1207\/revisions"}],"predecessor-version":[{"id":1576,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/1207\/revisions\/1576"}],"wp:attachment":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/media?parent=1207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}