{"id":52338,"date":"2025-11-20T13:48:58","date_gmt":"2025-11-20T12:48:58","guid":{"rendered":"https:\/\/grupoalava.rearmachine.com\/ingenieros\/aplicaciones\/qual-e-a-diferenca-entre-uma-imagem-multiespectral-e-uma-hiperespectral\/"},"modified":"2026-06-08T13:29:37","modified_gmt":"2026-06-08T11:29:37","slug":"qual-e-a-diferenca-entre-uma-imagem-multiespectral-e-uma-hiperespectral","status":"publish","type":"aplicaciones","link":"https:\/\/grupoalava.rearmachine.com\/pt\/mra\/aplicaciones\/qual-e-a-diferenca-entre-uma-imagem-multiespectral-e-uma-hiperespectral\/","title":{"rendered":"Qual \u00e9 a diferen\u00e7a entre uma imagem multiespectral e uma hiperespectral?"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>Vamos tentar expor as diferen\u00e7as entre<strong> 2 tipos de imagem muito diferentes <\/strong>das fotografias que estamos habituados a ver diariamente em jornais, revistas ou com os nossos pr\u00f3prios olhos:<\/p>\n<h3 style=\"--fontSize: 21; line-height: 1.4; --minFontSize: 21;\"><\/h3>\n<p>Imagens multiespetrais e imagens hiperespetrais<\/p>\n<p><u>Em primeiro lugar, vamos analisar separadamente as palavras imagem e espetro:<\/u><\/p>\n<\/p>\n<ul>\n<li><strong>Imagem:<\/strong> Reprodu\u00e7\u00e3o da figura de um objeto pela combina\u00e7\u00e3o dos raios de luz que prov\u00eam dele.<\/li>\n<li><strong>Espetro:<\/strong> Distribui\u00e7\u00e3o da intensidade de uma radia\u00e7\u00e3o em fun\u00e7\u00e3o de uma magnitude caracter\u00edstica, como o comprimento de onda, a energia, a frequ\u00eancia ou a massa.<\/li>\n<\/ul>\n<p>Portanto, uma <b>imagem espetral<\/b> \u00e9 aquela que reproduz a figura de um objeto em fun\u00e7\u00e3o do comprimento de onda que o objeto em quest\u00e3o esteja a refletir (ou a emitir); ou dito de outro modo, \u00e9 um conjunto de imagens do mesmo objeto representadas cada uma delas com diferentes comprimentos de onda.<\/p>\n<p><b>As diferen\u00e7as entre uma imagem multiespectral e uma imagem hiperespectral s\u00e3o m\u00faltiplas, mas a principal \u00e9 o n\u00famero de bandas espetrais.  <\/b>A imagem seguinte ilustra perfeitamente essa diferen\u00e7a:<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_3 1_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:33.333333333333%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:33.333333333333%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"278\" height=\"300\" alt=\"Las diferencias entre una imagen multiespectral y una imagen hiperespectral son m\u00faltiples, pero la principal es el n\u00famero de bandas espectrales\" title=\"IMG_0143\" src=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/IMG_0143-278x300.jpeg\" class=\"img-responsive wp-image-48010\" srcset=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/IMG_0143-200x216.jpeg 200w, https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/IMG_0143.jpeg 381w\" sizes=\"(max-width: 768px) 100vw, 278px\" \/><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:66.666666666667%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-2\"><p><span style=\"letter-spacing: 0.21px; background-color: rgba(0, 0, 0, 0);\"><br \/><\/span><\/p>\n<p><span style=\"letter-spacing: 0.21px; background-color: rgba(0, 0, 0, 0);\">Podemos dizer que as imagens multiespetrais s\u00e3o formadas por relativamente poucas bandas (normalmente entre 3 e 20) e s\u00e3o bandas n\u00e3o necessariamente cont\u00edguas umas \u00e0s outras, enquanto as imagens hiperespetrais s\u00e3o normalmente formadas por um maior n\u00famero de bandas e estas s\u00e3o sempre cont\u00edguas.<\/span><\/p>\n<\/p>\n<p>Com uma imagem multiespectral podemos obter os valores de intensidade nos comprimentos de onda discretos nos quais o sistema capte radia\u00e7\u00e3o, enquanto com uma imagem hiperespectral o que obtemos \u00e9 o espetro cont\u00ednuo ou assinatura espetral do objeto de an\u00e1lise.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-3\"><p>As seguintes imagens foram captadas com uma c\u00e2mara multiespectral com filtros espetrais em 436, 532, 540, 594 e <span style=\"letter-spacing: 0.21px; background-color: rgba(0, 0, 0, 0);\">605 nm \u00b1 20 nm (representa\u00e7\u00e3o em falsa cor), figura 2. <\/span><span style=\"letter-spacing: 0.21px; background-color: rgba(0, 0, 0, 0);\">Se normalizarmos a intensidade e representarmos os valores do mesmo p\u00edxel nas 5 imagens num gr\u00e1fico, o resultado <\/span><span style=\"letter-spacing: 0.21px; background-color: rgba(0, 0, 0, 0);\">seria o da Figura 3.<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-4 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-none\"><img decoding=\"async\" width=\"300\" height=\"186\" alt=\"Las siguientes im\u00e1genes fueron captadas con una c\u00e1mara multiespectral con filtros espectrales en 436, 532, 540, 594 y 605nm \u00b1 20nm (representaci\u00f3n en falso color), figura 2.\" title=\"Imagen5\" src=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/Imagen5-300x186.jpg\" class=\"img-responsive wp-image-48026\" srcset=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/Imagen5-200x124.jpg 200w, https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/Imagen5.jpg 372w\" sizes=\"(max-width: 768px) 100vw, 300px\" \/><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-5 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-aspect-ratio:1 \/ 1;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-3 hover-type-none has-aspect-ratio\"><img decoding=\"async\" width=\"201\" height=\"224\" alt=\"Si normalizamos la intensidad y representamos los valores del mismo p\u00edxel en las 5 im\u00e1genes en un gr\u00e1fico, el resultado ser\u00eda el de la Figura 3.\" title=\"Imagen4\" src=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/Imagen4.jpg\" class=\"img-responsive wp-image-48027 img-with-aspect-ratio\" data-parent-fit=\"cover\" data-parent-container=\".fusion-image-element\" \/><\/span><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-5 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-6 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:66.666666666667%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-4 hover-type-none\"><img decoding=\"async\" width=\"460\" height=\"262\" alt=\"Vamos a ver una imagen hiperespectral (representaci\u00f3n en falso) con el correspondiente espectro continuo en un p\u00edxel de la imagen:\" title=\"hiperespectral\" src=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/hiperespectral.jpg\" class=\"img-responsive wp-image-48032\" srcset=\"https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/hiperespectral-200x114.jpg 200w, https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/hiperespectral-400x228.jpg 400w, https:\/\/grupoalava.rearmachine.com\/wp-content\/uploads\/2025\/11\/hiperespectral.jpg 460w\" sizes=\"(max-width: 768px) 100vw, 460px\" \/><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-7 fusion_builder_column_1_3 1_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:33.333333333333%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:33.333333333333%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-4\"><p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Vamos ver uma imagem hiperespectral (representa\u00e7\u00e3o em falso) com o correspondente espetro cont\u00ednuo num p\u00edxel da imagem:<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-6 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1250px + 30px );margin-left: calc(-30px \/ 2 );margin-right: calc(-30px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-8 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:15px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:15px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:15px;--awb-spacing-left-medium:15px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:15px;--awb-spacing-left-small:15px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-5\"><p>O modo como se capturam as imagens multiespetrais e as imagens hiperespetrais tamb\u00e9m difere enormemente.<br \/>Enquanto as c\u00e2maras multiespetrais s\u00e3o do tipo frame e captam imagens com 2 dimens\u00f5es espaciais (X, Y), os sistemas de imagem hiperespectral tipo pushbroom geram &#8220;imagens&#8221; com 1 dimens\u00e3o espacial e uma dimens\u00e3o espe-<br \/>tral (X, Z), que corresponderia \u00e0 face lateral esquerda do cubo mostrado na figura 4.<\/p>\n<p>O processo para obter um cubo hiperespectral implica realizar um varrimento da cena para gerar a segunda dimens\u00e3o espacial e esse varrimento pode ser realizado de 2 maneiras: deslocando o objeto ou deslocando a c\u00e2mara hiperespectral sobre a cena ou sobre o objeto de estudo.<\/p>\n<p>Quanto ao uso de um ou outro tipo de imagens, podemos dizer que as imagens hiperespetrais oferecem muito mais informa\u00e7\u00e3o quantitativa e s\u00e3o utilizadas como ferramentas de diferencia\u00e7\u00e3o e classifica\u00e7\u00e3o espetral, enquanto as imagens multiespetrais cont\u00eam menos informa\u00e7\u00e3o mas s\u00e3o muito \u00fateis quando conhecemos os comprimentos de onda<br \/>que diferenciam um ou outro material.<\/p>\n<h3>As tecnologias multiespectral e hiperespectral s\u00e3o semelhantes e t\u00eam utiliza\u00e7\u00f5es distintas, mas podem e devem ser consideradas como tecnologias complementares.<\/h3>\n<\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":52339,"parent":0,"template":"","meta":{"_acf_changed":false},"industria-en-aplicacion":[7520],"producto-en-aplicacion":[7523,7524,7526],"class_list":["post-52338","aplicaciones","type-aplicaciones","status-publish","has-post-thumbnail","hentry","industria-en-aplicacion-centros-tecnologicos-e-universidades","producto-en-aplicacion-imagem-cientifica","producto-en-aplicacion-termografia","producto-en-aplicacion-detecao-remota"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qual \u00e9 a diferen\u00e7a entre uma imagem multiespectral e uma hiperespectral? - Grupo \u00c1lava<\/title>\n<meta name=\"description\" content=\"As diferen\u00e7as entre uma imagem multiespectral e uma imagem hiperespectral s\u00e3o m\u00faltiplas, mas a principal \u00e9 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