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DOTMTX-OPG-25x25-D1-S2.5
  • DOTMTX-OPG-25x25-D1-S2.5
  • Dot Grid Targets
  • Dot Grid Targets
  • Dot Grid Targets
  • Dot Grid Targets
  • Dot Grid Targets
  • Dot Grid Targets
Dot Grid Targets

Dot Grid Targets

$8.35
$8.35
DOTMTX-OPG-25x25-D1-S2.5
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Payment

What payment methods do you accept?

We accept common online payment methods, including credit card, Apple Pay, Google Pay, and other available checkout options.

Can I cancel my order and get a refund after payment?

Yes. If you contact us within 1 day after placing the order, the payment can usually be refunded before the order is processed.

Please contact us at admin@fulteng.com as soon as possible with your order details.
Shipping

How long does shipment take?

Order preparation usually takes 3–5 working days before shipment.

After the order is shipped, international delivery usually takes around 3–10 days, depending on the destination country and local delivery process.

How will my order be delivered?

We use e-commerce logistics to deliver the order to you.

The general process is:

  1. Order processing — payment is checked and stock is confirmed.
  2. Packing — the product is picked, packed, and prepared for shipment.
  3. Carrier hand-off — the package is passed to the logistics provider.
  4. Last-mile delivery — the local courier delivers the package to your address or collection point.

When will I receive the tracking number?

The tracking number is usually available only after the package reaches the last-mile courier stage.

This means tracking may not appear immediately after the order is packed or shipped.
Return policy

Can I return a standard product?

Yes. Standard products can be returned for any reason within 7 days after you receive the goods.

Please note:

  • The item should be returned in its original condition.
  • The return shipping cost is paid by the customer.
  • The standard return shipping cost is USD $35.

Can I return a custom product?

Custom products are made or prepared according to your specific requirements, so they usually cannot be returned.

Custom products can only be returned or handled if there is a confirmed quality problem with the product.

Dot Distortion Targets are used for lens distortion measurement, image calibration, machine vision setup, and optical system verification. Each variant is organized as a single Model option that includes material, size, dot size, dot spacing, dot array, useful area, and accuracy.

Models are available in optical glass and aluminum formats, with dot sizes and dot spacing selected for different field sizes and calibration requirements.

Product Videos

Product Guide

Product Ordering Tables

Product Ordering Tables
Model Polarity Array Format Accuracy Price Qty.
Optical Glass, 50x50mm, Dot Size 0.3mm, Dot Spacing 0.5mm, Useful Area 32.25x32.25mm
DOTMTX-OPG-50x50-D0.3-S0.5
 Positive 71x71 ±0.5μm $34.54
Optical Glass, 70x70mm, Dot Size 0.5mm, Dot Spacing 1.0mm, Useful Area 52.5x52.5mm
DOTMTX-OPG-70x70-D0.5-S1.0
 Positive 53x53 ±0.5μm $124.37
Optical Glass, 100x100mm, Dot Size 1.0mm, Dot Spacing 2.0mm, Useful Area 85x85mm
DOTMTX-OPG-100x100-D1.0-S2.0
 Positive 43x43 ±1.0μm $134.35
Optical Glass, 150x150mm, Dot Size 1.5mm, Dot Spacing 3.0mm, Useful Area 133.5x133.5mm
DOTMTX-OPG-150x150-D1.5-S3.0
 Positive 45x45 ±1.0μm $359.22
Optical Glass, 200x200mm, Dot Size 2.5mm, Dot Spacing 5.0mm, Useful Area 182.5x182.5mm
DOTMTX-OPG-200x200-D2.5-S5.0
 Positive 37x37 ±1.0μm $483.99
Optical Glass, 260x260mm, Dot Size 3.0mm, Dot Spacing 6.0mm, Useful Area 243x243mm
DOTMTX-OPG-260x260-D3.0-S6.0
 Positive 41x41 ±1.0μm $605.82
Optical Glass, 300x300mm, Dot Size 5.0mm, Dot Spacing 10.0mm, Useful Area 265x265mm
DOTMTX-OPG-300x300-D5.0-S10.0
 Positive 27x27 ±1.0μm $755.54
Optical Glass, 400x400mm, Dot Size 7.5mm, Dot Spacing 15.0mm, Useful Area 367.5x367.5mm
DOTMTX-OPG-400x400-D7.5-S15.0
 Positive 25x25 ±1.0μm $930.21
Optical Glass, 25x25mm, Dot Size 1mm, Dot Spacing 2.5mm, Useful Area 20x20mm
DOTMTX-OPG-25x25-D1-S2.5
 Positive 7x7 ±5.0μm $8.35
Optical Glass, 25x25mm, Dot Size 1.25mm, Dot Spacing 2.5mm, Useful Area 20x20mm
DOTMTX-OPG-25x25-D1.25-S2.5
 Positive 7x7 ±5.0μm $8.35
Optical Glass, 30.75x30.75mm, Dot Size 1.825mm, Dot Spacing 3.75mm, Useful Area 30x30mm
DOTMTX-OPG-30.75x30.75-D1.825-S3.75
 Positive 7x7 ±5.0μm $10.85
Optical Glass, 50x50mm, Dot Size 2mm, Dot Spacing 4mm, Useful Area 32x32mm
DOTMTX-OPG-50x50-D2-S4
 Positive 7x7 ±5.0μm $11.61
Optical Glass, 50x50mm, Dot Size 2.5mm, Dot Spacing 5mm, Useful Area 40x40mm
DOTMTX-OPG-50x50-D2.5-S5
 Positive 7x7 ±5.0μm $11.61
Optical Glass, 70x70mm, Dot Size 3.125mm, Dot Spacing 6.25mm, Useful Area 50x50mm
DOTMTX-OPG-70x70-D3.125-S6.25
 Positive 7x7 ±5.0μm $12.34
Optical Glass, 70x70mm, Dot Size 3.5mm, Dot Spacing 7mm, Useful Area 56x56mm
DOTMTX-OPG-70x70-D3.5-S7
 Positive 7x7 ±5.0μm $12.34
Optical Glass, 70x70mm, Dot Size 3.75mm, Dot Spacing 7.5mm, Useful Area 60x60mm
DOTMTX-OPG-70x70-D3.75-S7.5
 Positive 7x7 ±5.0μm $12.34
Optical Glass, 100x100mm, Dot Size 4mm, Dot Spacing 8mm, Useful Area 64x64mm
DOTMTX-OPG-100x100-D4-S8
 Positive 7x7 ±5.0μm $22.09
Optical Glass, 100x100mm, Dot Size 5mm, Dot Spacing 10mm, Useful Area 80x80mm
DOTMTX-OPG-100x100-D5-S10
 Positive 7x7 ±5.0μm $22.09
Optical Glass, 120x120mm, Dot Size 6.25mm, Dot Spacing 12.5mm, Useful Area 100x100mm
DOTMTX-OPG-120x120-D6.25-S12.5
 Positive 7x7 ±5.0μm $24.57
Optical Glass, 150x150mm, Dot Size 7.5mm, Dot Spacing 15mm, Useful Area 120x120mm
DOTMTX-OPG-150x150-D7.5-S15
 Positive 7x7 ±5.0μm $24.58
Optical Glass, 200x200mm, Dot Size 10mm, Dot Spacing 20mm, Useful Area 160x160mm
DOTMTX-OPG-200x200-D10-S20
 Positive 7x7 ±5.0μm $29.55
Optical Glass, 240x240mm, Dot Size 12.5mm, Dot Spacing 25mm, Useful Area 200x200mm
DOTMTX-OPG-240x240-D12.5-S25
 Positive 7x7 ±5.0μm $41.88
Optical Glass, 300x300mm, Dot Size 15mm, Dot Spacing 30mm, Useful Area 240x240mm
DOTMTX-OPG-300x300-D15-S30
 Positive 7x7 ±5.0μm $58.32
Optical Glass, 400x400mm, Dot Size 20mm, Dot Spacing 40mm, Useful Area 320x320mm
DOTMTX-OPG-400x400-D20-S40
 Positive 7x7 ±5.0μm $84.44
Aluminum, 25x25mm, Dot Size 1mm, Dot Spacing 2.5mm, Useful Area 20x20mm
DOTMTX-ALU-25x25-D1-S2.5
 Positive 7x7 ±5.0μm $124.37
Aluminum, 25x25mm, Dot Size 1.25mm, Dot Spacing 2.5mm, Useful Area 20x20mm
DOTMTX-ALU-25x25-D1.25-S2.5
 Positive 7x7 ±5.0μm $19.86
Aluminum, 30.75x30.75mm, Dot Size 1.825mm, Dot Spacing 3.75mm, Useful Area 30x30mm
DOTMTX-ALU-30.75x30.75-D1.825-S3.75
 Positive 7x7 ±5.0μm $17.92
Aluminum, 50x50mm, Dot Size 2mm, Dot Spacing 4mm, Useful Area 32x32mm
DOTMTX-ALU-50x50-D2-S4
 Positive 7x7 ±5.0μm $21.09
Aluminum, 50x50mm, Dot Size 2.5mm, Dot Spacing 5mm, Useful Area 40x40mm
DOTMTX-ALU-50x50-D2.5-S5
 Positive 7x7 ±5.0μm $22.09
Aluminum, 70x70mm, Dot Size 3.125mm, Dot Spacing 6.25mm, Useful Area 50x50mm
DOTMTX-ALU-70x70-D3.125-S6.25
 Positive 7x7 ±5.0μm $29.55
Aluminum, 70x70mm, Dot Size 3.5mm, Dot Spacing 7mm, Useful Area 56x56mm
DOTMTX-ALU-70x70-D3.5-S7
 Positive 7x7 ±5.0μm $29.55
Aluminum, 70x70mm, Dot Size 3.75mm, Dot Spacing 7.5mm, Useful Area 60x60mm
DOTMTX-ALU-70x70-D3.75-S7.5
 Positive 7x7 ±5.0μm $29.55
Aluminum, 100x100mm, Dot Size 4mm, Dot Spacing 8mm, Useful Area 64x64mm
DOTMTX-ALU-100x100-D4-S8
 Positive 7x7 ±5.0μm $36.89
Aluminum, 100x100mm, Dot Size 5mm, Dot Spacing 10mm, Useful Area 80x80mm
DOTMTX-ALU-100x100-D5-S10
 Positive 7x7 ±5.0μm $36.89
Aluminum, 120x120mm, Dot Size 6.25mm, Dot Spacing 12.5mm, Useful Area 100x100mm
DOTMTX-ALU-120x120-D6.25-S12.5
 Positive 7x7 ±5.0μm $49.22
Aluminum, 150x150mm, Dot Size 7.5mm, Dot Spacing 15mm, Useful Area 120x120mm
DOTMTX-ALU-150x150-D7.5-S15
 Positive 7x7 ±5.0μm $49.51
Aluminum, 200x200mm, Dot Size 10mm, Dot Spacing 20mm, Useful Area 160x160mm
DOTMTX-ALU-200x200-D10-S20
 Positive 7x7 ±5.0μm $84.74
Aluminum, 240x240mm, Dot Size 12.5mm, Dot Spacing 25mm, Useful Area 200x200mm
DOTMTX-ALU-240x240-D12.5-S25
 Positive 7x7 ±5.0μm $112.04
Aluminum, 300x300mm, Dot Size 15mm, Dot Spacing 30mm, Useful Area 240x240mm
DOTMTX-ALU-300x300-D15-S30
 Positive 7x7 ±5.0μm $142.28
Aluminum, 400x400mm, Dot Size 20mm, Dot Spacing 40mm, Useful Area 320x320mm
DOTMTX-ALU-400x400-D20-S40
 Positive 7x7 ±5.0μm $154.90
Optical Glass, 25.4x25.4mm, Dot Size 0.05mm, Dot Spacing 0.1mm, Useful Area 21.4x21.4mm,Negative
DOTMTX-OPG-25.4x25.4-D0.05-S0.1
 Negative 214x214 ±0.5μm $99.50
Optical Glass, 25.4x25.4mm, Dot Size 0.05mm, Dot Spacing 0.1mm, Useful Area 21.4x21.4mm, Positive
DOTMTX-OPG-25.4x25.4-D0.05-S0.1-P
 Positive 214x214 ±0.5μm $99.50

What is a Dot Grid Target

The feature points of the dot matrix calibration plate are evenly spaced circles. The center coordinates are determined by ellipse fitting; the accuracy of the center depends on the sharpness of the circle's edges and the degree of distortion.

Why to use Dot Grid Target?

Unlike a checkerboard pattern, the center of the circle is "calculated" through mathematical fitting, rather than being directly determined by geometric boundaries.

This design has several key advantages: It remains an ellipse even under perspective distortion: When the camera is tilted, the circle becomes an ellipse, but the center of the ellipse remains the same as the center of the circle (this mathematical property is crucial). It's better suited for large-angle calibration: The center can still be accurately extracted even at a 45° tilt. It has a denser density of feature points: More feature points can be placed within the same area.

Key features: Ellipse fitting for center extraction: Utilizing the property that perspective transformation does not change the position of the ellipse's center, accuracy is guaranteed. Strong resistance to perspective distortion: Feature points can still be accurately extracted even when shooting at an angle. Suitable for industrial environments: It has more lenient requirements for installation angles compared to a checkerboard pattern.

Checkerboard Target vs Dot Grid Target

Checkerboard Pattern vs. Dot Grid

Feature Extraction Accuracy: 0.01~0.05px vs. 0.01~0.1px

Perspective Distortion Resistance: Weak vs. Stronger (Ellipse Fitting)

Tilting Tolerance Angle: ≤30° vs. ≤45°

Occlusion Tolerance: Low vs. Medium

Software Support: Wide vs. Wide

Calibration Board Cost: Medium vs. Medium