{"id":27026,"date":"2023-09-29T12:27:06","date_gmt":"2023-09-29T12:27:06","guid":{"rendered":"https:\/\/www.preciouscloud.eu\/?page_id=27026"},"modified":"2023-09-29T13:20:16","modified_gmt":"2023-09-29T13:20:16","slug":"feature-extraction","status":"publish","type":"page","link":"https:\/\/www.preciouscloud.eu\/?page_id=27026","title":{"rendered":"Feature extraction"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"27026\" class=\"elementor elementor-27026\">\n\t\t\t\t\t\t<div class=\"elementor-section elementor-top-section elementor-element elementor-element-42ca420 elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"42ca420\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-f568539 layouts-column-align-inherit layouts-section-position-none\" data-id=\"f568539\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"hf-elementor-layout elementor-element elementor-element-4d2086d elementor-widget elementor-widget-section_title\" data-id=\"4d2086d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"section_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t<div class=\"left iq-title-box iq-title-default iq-title-box-1\">\n\t\t<div class=\"iq-title-icon\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<h2 class=\"iq-title\" >\n\t\t\tFeature extraction\t\t<\/h2>\n\t\t\t<p class=\"iq-title-desc\">Extracting features from biosignals (e.g. heart\/brain electrical activity, breathing, actigraphy, etc.) consists of three main distinct stages of analysis and processing. Initially, the recordings are pre-processed and filtered to minimize the effects of noise and external interference, which usually affects such recordings altering their morphological characteristics. Then, biosignals are typically segmented into smaller intervals of interest, depending on the application to be studied (usually seconds to minutes). This step is particularly important if temporal changes in signal behavior and characteristics need to be considered within the total duration of the recording. Finally, the main stage of the actual feature extraction can be implemented. A wide range of features in the time domain, frequency domain and time-frequency domain can be calculated (depending on the application), along with more specialized metrics such as those from Graph theory, or measures based on heart and respiratory rate variability. An example of the complete cardiac and respiratory activity feature extraction model is shown in the figure below.<\/p>\t<\/div>\n    \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-632639a layouts-column-align-inherit layouts-section-position-none\" data-id=\"632639a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"hf-elementor-layout elementor-element elementor-element-f71e588 elementor-widget elementor-widget-image\" data-id=\"f71e588\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.preciouscloud.eu\/wp-content\/uploads\/2023\/09\/Picture1_tsiouris.png\" title=\"Picture1_tsiouris\" alt=\"Picture1_tsiouris\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"hf-elementor-layout elementor-element elementor-element-45a1848 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"45a1848\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Tsiouris, \u039a. \u039c., Pezoulas, V. C., Zervakis, M., Konitsiotis, S., Koutsouris, D. D., &amp; Fotiadis, D. I., \u201cA long short-term memory deep learning network for the prediction of epileptic seizures using EEG signals,\u201d <em>Computers in biology and medicine<\/em>, Vol. 99, pp. 24-37, 2018.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dca4b5e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dca4b5e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5f7f299 layouts-column-align-inherit layouts-section-position-none\" data-id=\"5f7f299\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Feature extraction Extracting features from biosignals (e.g. heart\/brain electrical activity, breathing, actigraphy, etc.) consists of three main distinct stages of analysis and processing. Initially, the recordings are pre-processed and filtered to minimize the effects of noise and external interference, which usually affects such recordings altering their morphological characteristics. Then, biosignals are typically segmented into smaller [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-27026","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/pages\/27026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=27026"}],"version-history":[{"count":8,"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/pages\/27026\/revisions"}],"predecessor-version":[{"id":27106,"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=\/wp\/v2\/pages\/27026\/revisions\/27106"}],"wp:attachment":[{"href":"https:\/\/www.preciouscloud.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}