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Esdras Ntuyenabo

Engineer · LexData · 20 articles

How we write the blog

Operations · 6 min read

Face blurring for privacy in computer vision, done before the frame is stored

A blur applied after the request arrives is a blur applied to a frame that has already been copied. The step belongs at ingestion, beside the recorder.

Esdras Ntuyenabo · Sep 30, 2026

Industries · 7 min read

Fish size measurement on a grading line with a fixed camera

Fish boxed and sized against a calibrated channel, keypoints for true length when the tolerance demands it, and a bumped mount as the day every fish reads big.

Esdras Ntuyenabo · Sep 30, 2026

Industries · 6 min read

Object orientation from two keypoints, on a bottle line and a parcel sorter

Cap and base as keypoints, the angle between them as the answer, and consistent placement as the labeling rule that makes the whole thing hold.

Esdras Ntuyenabo · Sep 30, 2026

Industries · 6 min read

Occupancy analytics with computer vision for the lot, the dock and the floor

Each bay is a polygon, each sampled frame says occupied or free, and the whiteboard becomes a chart by hour. Snow is what the correction rate shows first.

Esdras Ntuyenabo · Sep 29, 2026

Computer vision · 6 min read

What semantic segmentation labels and what it costs

Drivable path, corrosion area and crop rows are questions about pixels, and the answer is a class for every one. Painted labels cost more than boxes.

Esdras Ntuyenabo · Sep 29, 2026

Labeling · 6 min read

Bounding boxes in computer vision, what a box teaches and what it reports

The same rectangle on a forklift is the lesson at training time and the answer at run time. Corner and centre formats, the shifted-box bug, floor in the box.

Esdras Ntuyenabo · Sep 28, 2026

Computer vision · 6 min read

When the outline is the answer and a box will not do

A weld defect whose area decides the rework and a part a robot has to grasp both need a mask. Here is what the mask costs to label and when a box is enough.

Esdras Ntuyenabo · Sep 28, 2026

Labeling · 6 min read

Natural language image annotation, type what to look for and check what comes back

Hard hat and reflective vest, typed once and run across a site camera's frames. The boxes get checked one by one, and the lanyard clip gets drawn by hand.

Esdras Ntuyenabo · Sep 28, 2026

Operations · 6 min read

Danger zone monitoring with object detection on a site camera

A polygon over the crane swing radius on a site camera. People and vehicles as classes, the bottom of the box as the test, the alert with the frame attached.

Esdras Ntuyenabo · Sep 27, 2026

Operations · 7 min read

Event-driven object detection, turning a bounding box into an alert someone acts on

The packing area camera sees cartons all day. Three stacked is the rule, the frame goes to the supervisor, and a cooldown makes one stack one alert.

Esdras Ntuyenabo · Sep 27, 2026

Industries · 6 min read

Ceramic defect detection for hairline cracks a fixed-rule camera cannot learn

Edge chips, hairline cracks and pinholes on the tile line after the kiln, masks where the area sets the grade, and the new glaze as the day to relabel.

Esdras Ntuyenabo · Sep 26, 2026

Industries · 6 min read

Expiration date detection on a curved bottle neck at the packing station

The code found as a box on the neck, read as a string, checked against the plant's own format, and the case held on a mismatch. A new coder is a spec change.

Esdras Ntuyenabo · Sep 26, 2026

Industries · 7 min read

PCB defect detection on bare boards, with a severity on every box

Opens, shorts and mouse bites boxed on the bare panel, critical ones rejected, repairable ones sent to rework with the frame, a new revision labeled early.

Esdras Ntuyenabo · Sep 26, 2026

Industries · 7 min read

Hog ring inspection on the seat line with object detection under the fabric

Every hog ring boxed and its closure read among wires and clips, the count checked against the build order, and the ring under the fabric is a labeling rule.

Esdras Ntuyenabo · Sep 25, 2026

Industries · 7 min read

Robotic welding defect detection on every weld the robot lays down

A camera at the weld cell names porosity, undercut and missing fusion on every part, sends the borderline weld to a person, and a new torch needs new frames.

Esdras Ntuyenabo · Sep 25, 2026

Industries · 7 min read

Bottle cap inspection with a camera at the capper outfeed

Sealed, loose and missing as three classes, a reject on the second two before the case packer, and the loose rate per batch as the number the technician wants.

Esdras Ntuyenabo · Sep 24, 2026

Industries · 7 min read

How to detect metal defects with computer vision, one model across brushed and polished parts

Scratch, dent, crack and pit on a stamping line, the light that shows each, a decision layer that knows the cosmetic face, a new alloy labeled in advance.

Esdras Ntuyenabo · Sep 24, 2026

Industries · 7 min read

Label inspection with computer vision, six checks a carton passes before the case is sealed

Presence, placement, orientation, print, content and barcode, each check cropping the frame for the next, from the camera on the labeler outfeed.

Esdras Ntuyenabo · Sep 24, 2026

Industries · 6 min read

Glass defect detection with computer vision, scratches where the background shows through

On a bottle line the conveyor shows through the glass and a scratch and a reflection are the same bright line. The labels have to follow the light.

Esdras Ntuyenabo · Sep 23, 2026

Computer vision · 5 min read

Pretrained vs fine-tuned detection models, when the stock detector cannot see the thing you need

A stock detector sees every worker on the scaffold and has no hard hat class, and no threshold will invent one. The site's own frames are what add it.

Esdras Ntuyenabo · Sep 23, 2026

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