{"id":5903,"date":"2025-11-19T17:16:03","date_gmt":"2025-11-19T17:16:03","guid":{"rendered":"https:\/\/pishi.ai\/?post_type=docs&#038;p=5903"},"modified":"2025-12-31T12:49:08","modified_gmt":"2025-12-31T12:49:08","password":"","slug":"face-sensing-simple-face-detection-in-scratch","status":"publish","type":"docs","link":"https:\/\/pishi.ai\/es\/help\/face-sensing-simple-face-detection-in-scratch\/","title":{"rendered":"Face Sensing &#8211; Simple Face Detection in Scratch"},"content":{"rendered":"<h2>\ud83d\ude0a Face Sensing &#8211; Simple Face Detection in Scratch<\/h2>\n<p>The Face Sensing extension brings easy-to-use face detection into Scratch.<br \/>\nIt lets your sprites react to face position, tilt, and size &#8211; all in real time, right in your browser, with no setup required.<br \/>\nPerfect for beginners and quick interactive projects. <strong>\ud83c\udfad<\/strong><\/p>\n<hr \/>\n<h2>\ud83c\udf1f Overview<\/h2>\n<ul>\n<li><strong>Detect 1 Face:<\/strong> Simple single-face detection for streamlined projects.<\/li>\n<li><strong>8 Key Points:<\/strong> Track essential facial features (eyes, nose, mouth, ears, and more).<\/li>\n<li><strong>Control Sprites:<\/strong> Make sprites move to face parts, tilt with your head, or resize based on face size.<\/li>\n<li><strong>Face Events:<\/strong> Trigger actions when a face is detected, tilted, or when sprites touch facial features.<\/li>\n<li><strong>Simple and Fast:<\/strong> Lightweight detection optimized for classroom use and quick prototyping.<\/li>\n<li><strong>Browser-Based:<\/strong> Works entirely in your browser &#8211; no external services needed.<\/li>\n<\/ul>\n<hr \/>\n<h2>\u2728 Key Features<\/h2>\n<ul>\n<li>Single-face tracking with 8 essential keypoints.<\/li>\n<li>Easy-to-use blocks for common face interactions.<\/li>\n<li>Real-time tilt detection (left\/right).<\/li>\n<li>Face size measurement for responsive animations.<\/li>\n<li>Works fully in-browser &#8211; <strong>safe and private<\/strong>.<\/li>\n<li>Great for beginners learning AI concepts.<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\ude80 How to Use<\/h2>\n<ol>\n<li>Go to: <a href=\"https:\/\/pishi.ai\/play\/\" target=\"_blank\" rel=\"noopener\">pishi.ai\/play<\/a><\/li>\n<li>Open the Extensions section.<\/li>\n<li>Select the Face Sensing extension.<\/li>\n<li>Allow camera access if prompted and check that your video preview appears.<\/li>\n<li>Once the extension loads successfully, automatic face detection starts at approximately 15 frames per second.<\/li>\n<li>Now you can use the command blocks to make sprites follow your face, mirror your movements, or react when you tilt your head!<\/li>\n<\/ol>\n<p><strong>Tips<\/strong><\/p>\n<ul>\n<li>Good lighting helps the model detect your face better.<\/li>\n<li>Face the camera directly for best accuracy.<\/li>\n<li>The extension works great on most devices, including older computers and Chromebooks.<\/li>\n<li>Try combining face detection with other Scratch features for creative projects!<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83e\uddf1 Blocks and Functions<\/h2>\n<p>&nbsp;<\/p>\n<h3>\ud83d\udccd Command Blocks<\/h3>\n<div class=\"scratchblocks\" id=\"block-go-to-part\">go to [PART|rect]<\/div>\n<p>Moves the sprite to a specific facial feature.<br \/>\n<span class=\"scratchblocks\" data-scratch-input-type=\"rect\">PART<\/span>: choose from the dropdown (nose, mouth, left eye, right eye, between eyes, left ear, right ear, or top of head).<br \/>\nThe sprite will follow that part as your face moves on screen.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-point-in-direction-of-face-tilt\">point in direction of face tilt<\/div>\n<p>Sets the sprite&#8217;s direction to match your face tilt angle.<br \/>\nPerfect for creating mirroring effects or head-controlled steering.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-set-size-to-face-size\">set size to face size<\/div>\n<p>Adjusts the sprite&#8217;s size to match the detected face size.<br \/>\nGet closer to the camera to make sprites bigger, move away to make them smaller.<\/p>\n<hr \/>\n<h3>\ud83d\udc4b Event Blocks (Hat Blocks)<\/h3>\n<div class=\"scratchblocks\" id=\"block-when-face-tilts\">when face tilts [DIRECTION|rect]<\/div>\n<p>Triggers when your face tilts left or right.<br \/>\n<span class=\"scratchblocks\" data-scratch-input-type=\"rect\">DIRECTION<\/span>: choose &#8220;left&#8221; or &#8220;right&#8221;.<br \/>\nTilt must exceed 10 degrees from center to trigger.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-when-sprite-touches-part\">when this sprite touches a [PART|rect]<\/div>\n<p>Triggers when the sprite touches a specific facial feature.<br \/>\n<span class=\"scratchblocks\" data-scratch-input-type=\"rect\">PART<\/span>: choose any of the 8 facial keypoints.<br \/>\nGreat for creating interactive &#8220;catch the feature&#8221; games.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-when-face-detected\">when a face is detected<\/div>\n<p>Triggers when a face appears in the camera view.<br \/>\nPerfect for starting animations or showing welcome messages.<\/p>\n<hr \/>\n<h3>\ud83d\udcca Reporter Blocks<\/h3>\n<div class=\"scratchblocks\" id=\"block-a-face-is-detected\">a face is detected?<\/div>\n<p>Boolean reporter that returns true when a face is detected, false otherwise.<br \/>\nUse in conditional statements to control program flow.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-face-tilt\">face tilt<\/div>\n<p>Reports the face tilt angle in degrees (0\u2013180).<br \/>\n90 = facing straight, less than 90 = tilted left, greater than 90 = tilted right.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"scratchblocks\" id=\"block-face-size\">face size<\/div>\n<p>Reports the detected face height in pixels.<br \/>\nLarger values mean the face is closer to the camera or is a larger face.<\/p>\n<hr \/>\n<h3>\ud83d\ude0a Available Face Parts<\/h3>\n<p>The Face Sensing extension can detect 8 key facial features:<\/p>\n<ul>\n<li><strong>nose<\/strong> &#8211; tip of the nose<\/li>\n<li><strong>mouth<\/strong> &#8211; center of the mouth<\/li>\n<li><strong>left eye<\/strong> &#8211; center of the left eye<\/li>\n<li><strong>right eye<\/strong> &#8211; center of the right eye<\/li>\n<li><strong>between eyes<\/strong> &#8211; midpoint between both eyes<\/li>\n<li><strong>left ear<\/strong> &#8211; position of the left ear<\/li>\n<li><strong>right ear<\/strong> &#8211; position of the right ear<\/li>\n<li><strong>top of head<\/strong> &#8211; estimated top of the head (calculated from eye and mouth positions)<\/li>\n<\/ul>\n<p style=\"font-size: 0.9em; color: #555;\">Note: &#8220;Left&#8221; and &#8220;right&#8221; refer to your left and right when looking at the screen (mirrored view).<\/p>\n<hr \/>\n<h2>\ud83c\udf93 Educational Uses<\/h2>\n<ul>\n<li><strong>Introduction to AI:<\/strong> Show students how computers can recognize and track faces in real time.<\/li>\n<li><strong>Coordinate Systems:<\/strong> Teach X\/Y positioning by linking face parts to sprite locations.<\/li>\n<li><strong>Event-Driven Programming:<\/strong> Practice using hat blocks that respond to face detection events.<\/li>\n<li><strong>Accessibility Projects:<\/strong> Create hands-free controllers for students who benefit from alternative input methods.<\/li>\n<li><strong>Creative Expression:<\/strong> Build interactive art that responds to user presence and movement.<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83c\udfae Example Projects<\/h2>\n<ul>\n<li><strong>Face Follower:<\/strong> Make a sprite follow your nose around the screen &#8211; great first project!<\/li>\n<li><strong>Tilt Racer:<\/strong> Tilt your head left or right to steer a car through obstacles.<\/li>\n<li><strong>Size Mirror:<\/strong> Create a sprite that grows and shrinks as you move closer or farther from the camera.<\/li>\n<li><strong>Face-Activated Game:<\/strong> Start gameplay only when a face is detected &#8211; perfect for multiplayer games.<\/li>\n<li><strong>Catch the Feature:<\/strong> Control a sprite and try to touch different face parts for points.<\/li>\n<li><strong>Copycat Animation:<\/strong> Make a character tilt and move along with your face for mirroring effects.<\/li>\n<li><strong>Magic Mirror:<\/strong> Combine face parts and costume changes to create augmented reality effects.<\/li>\n<\/ul>\n<p>\ud83e\udde9 <strong>Try it yourself:<\/strong> <a href=\"https:\/\/pishi.ai\/play\/\" target=\"_blank\" rel=\"noopener\">pishi.ai\/play<\/a><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h2>\ud83d\udd27 Tips and Troubleshooting<\/h2>\n<p>&nbsp;<\/p>\n<h3>\ud83c\udfaf Face Sensing Specific Tips<\/h3>\n<ul>\n<li><strong>No face detected?<\/strong> Make sure your face is well-lit and fully visible to the camera. Avoid sitting with bright windows behind you.<\/li>\n<li><strong>Tracking jittery?<\/strong> Try to keep your head relatively still. The extension has built-in smoothing, but sudden movements may cause brief instability.<\/li>\n<li><strong>Face parts not where expected?<\/strong> Remember the camera view is mirrored &#8211; your left appears on the right side of the screen.<\/li>\n<li><strong>Tilt not triggering?<\/strong> You need to tilt at least 10 degrees left or right from center for the hat block to activate.<\/li>\n<li><strong>Face size seems wrong?<\/strong> Face size is measured in screen pixels. The value will be larger when you&#8217;re closer to the camera.<\/li>\n<li><strong>Extension slow to load?<\/strong> The first load downloads the AI model. Subsequent uses will be faster thanks to browser caching.<\/li>\n<li><strong>Sprite not following smoothly?<\/strong> Use &#8220;glide&#8221; blocks instead of instant &#8220;go to&#8221; commands for smoother motion.<\/li>\n<li><strong>Multiple people on camera?<\/strong> The extension tracks only one face &#8211; typically the largest or most centered face in view.<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udd12 Privacy and Safety<\/h2>\n<ul>\n<li>All face sensing runs locally in your browser.<\/li>\n<li>No images or video are uploaded or stored.<\/li>\n<li>The extension only detects simple face movement and does not identify people.<\/li>\n<li>Ask a teacher or parent before using the camera.<\/li>\n<li>You can turn the camera off anytime using other camera-based extensions (such as Video Sensing or FaceMesh).<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83e\uddea Technical Info<\/h2>\n<ul>\n<li><strong>Model:<\/strong> MediaPipe Face Detector<\/li>\n<li><strong>Framework:<\/strong> TensorFlow.js with @tensorflow-models\/face-detection &#8211; runs fully in-browser<\/li>\n<li><strong>Faces:<\/strong> 1 face maximum<\/li>\n<li><strong>Keypoints:<\/strong> 8 facial landmarks (nose, mouth, eyes, ears, between eyes, top of head)<\/li>\n<li><strong>Detection Rate:<\/strong> ~15 frames per second (adjusts based on system performance)<\/li>\n<li><strong>Smoothing:<\/strong> Built-in 5-frame smoothing to prevent false positives<\/li>\n<li><strong>Tilt Threshold:<\/strong> 10 degrees deviation from center<\/li>\n<li><strong>Coordinates:<\/strong> Stage-centered pixels (X right, Y up)<\/li>\n<li><strong>Video Format:<\/strong> 480\u00d7360 analysis resolution<\/li>\n<li><strong>Requires:<\/strong> Modern browser with WebGL support and camera permissions<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udd17 Related Extensions<\/h2>\n<ul>\n<li><strong>\ud83d\ude0e FaceMesh<\/strong> &#8211; advanced 478-point face landmark detection for detailed expression tracking<\/li>\n<li>\ud83d\udd90\ufe0f <strong>Hand Pose<\/strong> &#8211; detect and track hand positions and gestures<\/li>\n<li>\ud83d\udd7a <strong>Bolsa Net<\/strong> &#8211; full-body pose detection and tracking<\/li>\n<li>\ud83c\udfeb <strong>M\u00e1quina de ense\u00f1anza de Google<\/strong> &#8211; train and use custom AI models<\/li>\n<li><strong>\ud83d\uddbc\ufe0f Image Trainer<\/strong> &#8211; build your own image recognition models<\/li>\n<\/ul>\n<hr \/>\n<p><div class=\"pishi-table\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Feature<\/th>\r\n<th>MIT Scratch Face Sensing<\/th>\r\n<th>Pishi.ai FaceMesh<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><strong>Detection Type<\/strong><\/td>\r\n<td>Simple face rectangle detection (bounding box only).<\/td>\r\n<td>Advanced 3D face landmark detection with 478 keypoints.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Faces Supported<\/strong><\/td>\r\n<td>1 face<\/td>\r\n<td>Up to 4 faces simultaneously<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Keypoints \/ Landmarks<\/strong><\/td>\r\n<td>None (just general position and size).<\/td>\r\n<td>468 standard landmarks + 10 iris keypoints (eyes, lips, chin, nose, etc.)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Expression Tracking<\/strong><\/td>\r\n<td>Limited - only \u201cface present\u201d or \u201cmoved\u201d detection.<\/td>\r\n<td>Full facial geometry - can measure smiles, blinks, mouth open, tilt, nod, or eyebrow raise.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Input Source<\/strong><\/td>\r\n<td>Camera only<\/td>\r\n<td>Camera or stage image (for analyzing photos or screenshots). In stage mode, camera and stage can also be classified together for combined analysis.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Video Controls<\/strong><\/td>\r\n<td>Turn video on, on and flipped, off, and change video preview transparency.<\/td>\r\n<td>Camera selection support as well as turn video on, on and flipped, off only, and change video preview transparency.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Performance Tuning<\/strong><\/td>\r\n<td>Fixed speed.<\/td>\r\n<td>Flexible detection modes - adjustable interval (every 50\u20132500 ms), continuous detection, or detection on block click. Classification can also be turned on or off at any time for performance control or teaching demonstrations.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Privacy<\/strong><\/td>\r\n<td>Runs locally in browser.<\/td>\r\n<td>100% local, no upload - same privacy level, but works even offline after model load.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Educational Focus<\/strong><\/td>\r\n<td>Simple introduction to face detection.<\/td>\r\n<td>Deep exploration of AI and computer vision concepts - geometry, math, and interaction design.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n<p class=\"pishi-table-note\"><em>\u2194 Swipe left or right to view full table on mobile<\/em><\/p><br \/>\n&nbsp;<\/p>\n<h3>\ud83d\udca1 When to Choose Face Sensing<\/h3>\n<p><strong>Face Sensing is perfect when you want simple, fast face detection without complexity.<\/strong><\/p>\n<ul>\n<li><strong>Getting started with AI:<\/strong> Easy blocks make it perfect for beginners and classroom introductions.<\/li>\n<li><strong>Quick prototypes:<\/strong> Fast setup for testing face-controlled interaction ideas.<\/li>\n<li><strong>Basic interactions:<\/strong> Following faces, reacting to tilts, and size-based effects are built right in.<\/li>\n<li><strong>Older devices:<\/strong> Lightweight detection runs smoothly even on Chromebooks and older computers.<\/li>\n<li><strong>Simple projects:<\/strong> When you don&#8217;t need detailed landmark tracking, Face Sensing is faster and easier.<\/li>\n<\/ul>\n<p><strong>In short:<\/strong><br \/>\nFace Sensing is ideal for simple, beginner-friendly projects and learning the basics of face detection.<br \/>\nFaceMesh is for creators who need detailed facial landmark tracking and advanced expression analysis.<\/p>\n<hr \/>\n<h2>\ud83d\udcda Learn More<\/h2>\n<ul>\n<li><a href=\"https:\/\/pishi.ai\/es\/help\/\" target=\"_blank\" rel=\"noopener\">AI Extensions Help at pishi.ai<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/google-ai-edge\/mediapipe\" target=\"_blank\" rel=\"noopener\">MediaPipe Face Detector Documentation<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/tensorflow\/tfjs-models\/tree\/master\/face-detection\" target=\"_blank\" rel=\"noopener\">TensorFlow.js Face Detection Model<\/a><\/li>\n<li><a href=\"https:\/\/scratch.mit.edu\/ideas\" target=\"_blank\" rel=\"noopener\">Scratch Ideas<\/a><\/li>\n<\/ul>\n<hr \/>\n<p><script>\nwindow.scratchBlocksConfig = {\n\tblockSpecs: [\n\t\t{ id: 'block-go-to-part' },\n\t\t{ id: 'block-point-in-direction-of-face-tilt' },\n\t\t{ id: 'block-set-size-to-face-size' },\n\t\t{ id: 'block-when-face-tilts', blockType: 'hat' },\n\t\t{ id: 'block-when-sprite-touches-part', blockType: 'hat' },\n\t\t{ id: 'block-when-face-detected', blockType: 'hat' },\n\t\t{ id: 'block-block-set-size-to-face-size' },\n\t\t{ id: 'block-a-face-is-detected', blockType: 'boolean' },\n\t\t{ id: 'block-face-tilt', blockType: 'reporter' },\n\t\t{ id: 'block-face-size', blockType: 'reporter' }\n\t\t]\n};\n<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>\ud83d\ude0a Face Sensing &#8211; Simple Face Detection in Scratch The Face Sensing extension brings easy-to-use face detection into Scratch. It lets your sprites react to face position, tilt, and size &#8211; all in real time, right in your browser, with no setup required. Perfect for beginners and quick interactive projects. \ud83c\udfad \ud83c\udf1f Overview Detect 1 [&hellip;]<\/p>","protected":false},"author":1,"featured_media":5121,"comment_status":"open","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"doc_category":[20],"doc_tag":[],"class_list":["post-5903","docs","type-docs","status-publish","has-post-thumbnail","hentry","doc_category-face-sensing-for-scratch"],"year_month":"2026-04","word_count":1334,"total_views":"0","reactions":{"happy":"0","normal":"0","sad":"1"},"author_info":{"name":"admin","author_nicename":"pishi-aipishrobot","author_url":"https:\/\/pishi.ai\/es\/author\/pishi-aipishrobot\/"},"doc_category_info":[{"term_name":"Face Sensing for Scratch","term_url":"https:\/\/pishi.ai\/es\/help-category\/face-sensing-for-scratch\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Face Sensing - Simple Face Detection in Scratch - Pishi.ai<\/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:\/\/pishi.ai\/es\/help\/face-sensing-simple-face-detection-in-scratch\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Face Sensing - Simple Face Detection in Scratch - Pishi.ai\" \/>\n<meta property=\"og:description\" content=\"\ud83d\ude0a Face Sensing &#8211; Simple Face Detection in Scratch The Face Sensing extension brings easy-to-use face detection into Scratch. 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