diff --git a/CHANGELOG.md b/CHANGELOG.md
index 338cf5f3..8f9da4b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,11 @@ Repository: **<git+https://github.com/vladmandic/human.git>**
 
 ## Changelog
 
-### **HEAD -> main** 2021/06/08 mandic00@live.com
+### **HEAD -> main** 2021/06/09 mandic00@live.com
+
+- add body segmentation sample
+
+### **release: 2.0.1** 2021/06/08 mandic00@live.com
 
 - release 2.0
 
diff --git a/demo/index.js b/demo/index.js
index c771e2f4..2a84e439 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -50,7 +50,7 @@ let userConfig = {
   hand: { enabled: false },
   body: { enabled: false },
   // body: { enabled: true, modelPath: 'posenet.json' },
-  segmentation: { enabled: true },
+  segmentation: { enabled: false },
   */
 };
 
@@ -547,7 +547,7 @@ async function processImage(input, title) {
       document.getElementById('loader').style.display = 'none';
       if (ui.detectThread) cancelAnimationFrame(ui.detectThread);
       if (ui.drawThread) cancelAnimationFrame(ui.drawThread);
-
+      log('processed image:', title);
       resolve(true);
     };
     image.src = input;
diff --git a/package.json b/package.json
index 001071bc..c4746645 100644
--- a/package.json
+++ b/package.json
@@ -72,7 +72,7 @@
     "canvas": "^2.8.0",
     "chokidar": "^3.5.1",
     "dayjs": "^1.10.5",
-    "esbuild": "^0.12.7",
+    "esbuild": "^0.12.8",
     "eslint": "^7.28.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-plugin-import": "^2.23.4",
@@ -82,7 +82,7 @@
     "node-fetch": "^2.6.1",
     "rimraf": "^3.0.2",
     "seedrandom": "^3.0.5",
-    "simple-git": "^2.39.0",
+    "simple-git": "^2.39.1",
     "tslib": "^2.2.0",
     "typedoc": "^0.21.0-beta.2",
     "typescript": "4.3.2"
diff --git a/src/object/centernet.ts b/src/object/centernet.ts
index e3bfa371..274a40aa 100644
--- a/src/object/centernet.ts
+++ b/src/object/centernet.ts
@@ -49,11 +49,15 @@ async function process(res: Tensor, inputSize, outputShape, config: Config) {
     const score = Math.trunc(100 * detections[0][id][4]) / 100;
     const classVal = detections[0][id][5];
     const label = labels[classVal].label;
-    const boxRaw = [
+    const [x, y] = [
       detections[0][id][0] / inputSize,
       detections[0][id][1] / inputSize,
-      detections[0][id][2] / inputSize,
-      detections[0][id][3] / inputSize,
+    ];
+    const boxRaw = [
+      x,
+      y,
+      detections[0][id][2] / inputSize - x,
+      detections[0][id][3] / inputSize - y,
     ] as [number, number, number, number];
     const box = [
       Math.trunc(boxRaw[0] * outputShape[0]),
diff --git a/src/tfjs/backend.ts b/src/tfjs/backend.ts
index 2344ec29..f5521338 100644
--- a/src/tfjs/backend.ts
+++ b/src/tfjs/backend.ts
@@ -10,9 +10,10 @@ export const config = {
   name: 'humangl',
   priority: 99,
   canvas: <null | OffscreenCanvas | HTMLCanvasElement>null,
-  gl: <unknown>null,
+  gl: <null | WebGL2RenderingContext>null,
   width: 1024,
   height: 1024,
+  extensions: <string[]> [],
   webGLattr: { // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.2
     alpha: false,
     antialias: false,
@@ -25,9 +26,25 @@ export const config = {
   },
 };
 
+function extensions(): void {
+  /*
+  https://www.khronos.org/registry/webgl/extensions/
+  https://webglreport.com/?v=2
+  */
+  const gl = config.gl;
+  if (!gl) return;
+  config.extensions = gl.getSupportedExtensions() as string[];
+  // gl.getExtension('KHR_parallel_shader_compile');
+}
+
+/**
+ * Registers custom WebGL2 backend to be used by Human library
+ *
+ * @returns void
+ */
 export function register(): void {
   if (!tf.findBackend(config.name)) {
-    log('backend registration:', config.name);
+    // log('backend registration:', config.name);
     try {
       config.canvas = (typeof OffscreenCanvas !== 'undefined') ? new OffscreenCanvas(config.width, config.height) : document.createElement('canvas');
     } catch (err) {
@@ -35,7 +52,7 @@ export function register(): void {
       return;
     }
     try {
-      config.gl = config.canvas.getContext('webgl2', config.webGLattr);
+      config.gl = config.canvas.getContext('webgl2', config.webGLattr) as WebGL2RenderingContext;
     } catch (err) {
       log('error: cannot get WebGL2 context:', err);
       return;
@@ -65,13 +82,11 @@ export function register(): void {
     }
     try {
       tf.ENV.set('WEBGL_VERSION', 2);
-      // tf.ENV.set('WEBGL_MAX_TEXTURE_SIZE', config.gl.getParameter(config.gl.MAX_TEXTURE_SIZE));
-      // tf.ENV.set('WEBGL_FORCE_F16_TEXTURES', true);
-      // tf.ENV.set('WEBGL_PACK_DEPTHWISECONV', true);
     } catch (err) {
       log('error: cannot set WebGL backend flags:', err);
       return;
     }
+    extensions();
     log('backend registered:', config.name);
   }
 }