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chore: Fix bounding box annotation #982

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e2418a3
chore: Fix bounding box annotation
msluszniak Mar 18, 2026
c4e4be7
chore: abstract logic of bounding box in to shared component
msluszniak Mar 19, 2026
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85 changes: 85 additions & 0 deletions apps/computer-vision/components/BoundingBoxes.tsx
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Original file line number Diff line number Diff line change
@@ -0,0 +1,85 @@
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { Detection } from 'react-native-executorch';
import { labelColor, labelColorBg } from './utils/colors';

interface Props {
detections: Detection[];
scaleX: number;
scaleY: number;
offsetX: number;
offsetY: number;
mirrorLabels?: boolean;
}

export default function BoundingBoxes({
detections,
scaleX,
scaleY,
offsetX,
offsetY,
mirrorLabels = false,
}: Props) {
return (
<>
{detections.map((det, i) => {
const left = det.bbox.x1 * scaleX + offsetX;
const top = det.bbox.y1 * scaleY + offsetY;
const width = (det.bbox.x2 - det.bbox.x1) * scaleX;
const height = (det.bbox.y2 - det.bbox.y1) * scaleY;
const labelTop = top < 26 ? top + height + 2 : top - 26;

return (
<React.Fragment key={i}>
<View
style={[
styles.bbox,
{
left,
top,
width,
height,
borderColor: labelColor(det.label),
},
]}
/>
<View
style={[
styles.label,
{
left,
top: labelTop,
backgroundColor: labelColorBg(det.label),
},
mirrorLabels && { transform: [{ scaleX: -1 }] },
]}
>
<Text style={styles.labelText} numberOfLines={1}>
{det.label} ({(det.score * 100).toFixed(1)}%)
</Text>
</View>
</React.Fragment>
);
})}
</>
);
}

const styles = StyleSheet.create({
bbox: {
position: 'absolute',
borderWidth: 2,
borderRadius: 4,
},
label: {
position: 'absolute',
paddingHorizontal: 6,
paddingVertical: 2,
borderRadius: 4,
},
labelText: {
color: 'white',
fontSize: 11,
fontWeight: '600',
},
});
51 changes: 14 additions & 37 deletions apps/computer-vision/components/ImageWithBboxes.tsx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import React from 'react';
import { Image, StyleSheet, View, Text } from 'react-native';
import { Image, StyleSheet, View } from 'react-native';
import { Detection } from 'react-native-executorch';
import BoundingBoxes from './BoundingBoxes';

interface Props {
imageUri: string;
Expand All @@ -21,7 +22,7 @@ export default function ImageWithBboxes({
const imageRatio = imageWidth / imageHeight;
const layoutRatio = layout.width / layout.height;

let sx, sy; // Scale in x and y directions
let sx, sy;
if (imageRatio > layoutRatio) {
// image is more "wide"
sx = layout.width / imageWidth;
Expand All @@ -35,11 +36,13 @@ export default function ImageWithBboxes({
return {
scaleX: sx,
scaleY: sy,
offsetX: (layout.width - imageWidth * sx) / 2, // Centering the image horizontally
offsetY: (layout.height - imageHeight * sy) / 2, // Centering the image vertically
offsetX: (layout.width - imageWidth * sx) / 2,
offsetY: (layout.height - imageHeight * sy) / 2,
};
};

const { scaleX, scaleY, offsetX, offsetY } = calculateAdjustedDimensions();

return (
<View
style={styles.container}
Expand All @@ -57,24 +60,13 @@ export default function ImageWithBboxes({
: require('../assets/icons/executorch_logo.png')
}
/>
{detections.map((detection, index) => {
const { scaleX, scaleY, offsetX, offsetY } =
calculateAdjustedDimensions();
const { x1, y1, x2, y2 } = detection.bbox;

const left = x1 * scaleX + offsetX;
const top = y1 * scaleY + offsetY;
const width = (x2 - x1) * scaleX;
const height = (y2 - y1) * scaleY;

return (
<View key={index} style={[styles.bbox, { left, top, width, height }]}>
<Text style={styles.label}>
{detection.label} ({(detection.score * 100).toFixed(1)}%)
</Text>
</View>
);
})}
<BoundingBoxes
detections={detections}
scaleX={scaleX}
scaleY={scaleY}
offsetX={offsetX}
offsetY={offsetY}
/>
</View>
);
}
Expand All @@ -89,19 +81,4 @@ const styles = StyleSheet.create({
width: '100%',
height: '100%',
},
bbox: {
position: 'absolute',
borderWidth: 2,
borderColor: 'red',
},
label: {
position: 'absolute',
top: -20,
left: 0,
backgroundColor: 'rgba(255, 0, 0, 0.7)',
color: 'white',
fontSize: 12,
paddingHorizontal: 4,
borderRadius: 4,
},
});
41 changes: 41 additions & 0 deletions apps/computer-vision/components/utils/colors.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
export const CLASS_COLORS: number[][] = [
[0, 0, 0, 0],
[51, 255, 87, 180],
[51, 87, 255, 180],
[255, 51, 246, 180],
[51, 255, 246, 180],
[243, 255, 51, 180],
[141, 51, 255, 180],
[255, 131, 51, 180],
[51, 255, 131, 180],
[131, 51, 255, 180],
[255, 255, 51, 180],
[51, 255, 255, 180],
[255, 51, 143, 180],
[127, 51, 255, 180],
[51, 255, 175, 180],
[255, 175, 51, 180],
[179, 255, 51, 180],
[255, 87, 51, 180],
[255, 51, 162, 180],
[51, 162, 255, 180],
[162, 51, 255, 180],
];

export function hashLabel(label: string): number {
let hash = 5381;
for (let i = 0; i < label.length; i++) {
hash = (hash + hash * 32 + label.charCodeAt(i)) % 1000003;
}
return 1 + (Math.abs(hash) % (CLASS_COLORS.length - 1));
}

export function labelColor(label: string): string {
const color = CLASS_COLORS[hashLabel(label)]!;
return `rgba(${color[0]},${color[1]},${color[2]},1)`;
}

export function labelColorBg(label: string): string {
const color = CLASS_COLORS[hashLabel(label)]!;
return `rgba(${color[0]},${color[1]},${color[2]},0.75)`;
}
63 changes: 10 additions & 53 deletions apps/computer-vision/components/vision_camera/tasks/ObjectDetectionTask.tsx
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import React, { useCallback, useEffect, useRef, useState } from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { StyleSheet, View } from 'react-native';
import { Frame, useFrameOutput } from 'react-native-vision-camera';
import { scheduleOnRN } from 'react-native-worklets';
import {
Expand All @@ -8,7 +8,7 @@ import {
SSDLITE_320_MOBILENET_V3_LARGE,
useObjectDetection,
} from 'react-native-executorch';
import { labelColor, labelColorBg } from '../utils/colors';
import BoundingBoxes from '../../BoundingBoxes';
import { TaskProps } from './types';

type ObjModelId = 'objectDetectionSsdlite' | 'objectDetectionRfdetr';
Expand Down Expand Up @@ -118,57 +118,14 @@ export default function ObjectDetectionTask({
]}
pointerEvents="none"
>
{detections.map((det, i) => {
const left = det.bbox.x1 * scale + offsetX;
const top = det.bbox.y1 * scale + offsetY;
const w = (det.bbox.x2 - det.bbox.x1) * scale;
const h = (det.bbox.y2 - det.bbox.y1) * scale;
return (
<View
key={i}
style={[
styles.bbox,
{
left,
top,
width: w,
height: h,
borderColor: labelColor(det.label),
},
]}
>
<View
style={[
styles.bboxLabel,
{ backgroundColor: labelColorBg(det.label) },
cameraPosition === 'front' && { transform: [{ scaleX: -1 }] },
]}
>
<Text style={styles.bboxLabelText}>
{det.label} {(det.score * 100).toFixed(1)}
</Text>
</View>
</View>
);
})}
<BoundingBoxes
detections={detections}
scaleX={scale}
scaleY={scale}
offsetX={offsetX}
offsetY={offsetY}
mirrorLabels={cameraPosition === 'front'}
/>
</View>
);
}

const styles = StyleSheet.create({
bbox: {
position: 'absolute',
borderWidth: 2,
borderColor: 'cyan',
borderRadius: 4,
},
bboxLabel: {
position: 'absolute',
top: -22,
left: -2,
paddingHorizontal: 6,
paddingVertical: 2,
borderRadius: 4,
},
bboxLabelText: { color: 'white', fontSize: 11, fontWeight: '600' },
});
42 changes: 1 addition & 41 deletions apps/computer-vision/components/vision_camera/utils/colors.ts
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Original file line number Diff line number Diff line change
@@ -1,41 +1 @@
export const CLASS_COLORS: number[][] = [
[0, 0, 0, 0],
[51, 255, 87, 180],
[51, 87, 255, 180],
[255, 51, 246, 180],
[51, 255, 246, 180],
[243, 255, 51, 180],
[141, 51, 255, 180],
[255, 131, 51, 180],
[51, 255, 131, 180],
[131, 51, 255, 180],
[255, 255, 51, 180],
[51, 255, 255, 180],
[255, 51, 143, 180],
[127, 51, 255, 180],
[51, 255, 175, 180],
[255, 175, 51, 180],
[179, 255, 51, 180],
[255, 87, 51, 180],
[255, 51, 162, 180],
[51, 162, 255, 180],
[162, 51, 255, 180],
];

export function hashLabel(label: string): number {
let hash = 5381;
for (let i = 0; i < label.length; i++) {
hash = (hash + hash * 32 + label.charCodeAt(i)) % 1000003;
}
return 1 + (Math.abs(hash) % (CLASS_COLORS.length - 1));
}

export function labelColor(label: string): string {
const color = CLASS_COLORS[hashLabel(label)]!;
return `rgba(${color[0]},${color[1]},${color[2]},1)`;
}

export function labelColorBg(label: string): string {
const color = CLASS_COLORS[hashLabel(label)]!;
return `rgba(${color[0]},${color[1]},${color[2]},0.75)`;
}
export * from '../../utils/colors';
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