Summary
- 1. Introduction
- 2. General Requirements
- 3. Product Preparation
- 4. Image Capture Procedure
- 5. Objects that are difficult to scan
- 6. Final Considerations
1. Introduction
This guide outlines the best practices for capturing image datasets intended for 3D photogrammetric reconstruction.
The goal is to ensure consistent, high-quality image sets that result in clean and accurate 3D models, reducing the need for manual cleanup and post-processing.
2. General Requirements
Below are the key technical requirements necessary to achieve high-quality photogrammetric results.
2.1 Lighting Setup
The lighting conditions can affect the quality of the 3D model. If the object is in a dark environment, the app will not be able to capture the details of the object.
Be sure to place the object in a well-lit environment to capture all the details of the object. Avoid also shadows from other objects that can affect the quality of the 3D model.
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Use consistent, diffused lighting to eliminate harsh shadows and highlights.
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Prefer softboxes or large diffusers evenly placed around the product.
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Avoid direct lighting or small point sources that may cause reflections or glare.
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Ensure uniform coverage from all sides, including from below if necessary.
- Avoid underexposure and overexposure.
2.2 Camera Setup
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Minimum resolution: 30MP
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Recommended lens: 50mm
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Use of a polarizing filter is strongly recommended to minimize unwanted reflections and improve surface detail accuracy.
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ISO: ≤ 200, preferably ISO 100
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F-stop: f/8 – f/14
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Image format: JPG
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Use a tripod or stable support to avoid camera shake.
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Maintain a consistent distance from the product throughout the capture sequence.
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Angle and height should remain as stable as possible across shots.
2.3 Focus Settings
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Maximize pixel area while ensuring all parts are in focus.
- Always verify focus before shooting.
2.4 Environment
The environment can affect the quality of the 3D model. If the object is in a cluttered environment, the app will not be able to create the 3D model of the object.
For this reason, you should place the object in a clean environment to create the 3D model of the object without issues.
Avoid also objects that can reflect the light and affect the quality of the 3D model like mirrors, glass, and shiny surfaces.
Recommended Background Types
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Capture images in a controlled environment with a neutral and distraction-free background.
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Light neutral grey is ideal when photographing white/light products, to increase contrast and avoid clipping.
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Avoid clutter or nearby objects that could interfere with the image alignment process.
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Ensure that the background does not cast colored light or reflections onto the product.
Common Mistakes to Avoid
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Wrinkled or creased backdrops
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Gradients or color transitions
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Reflective support surfaces (glass, glossy plastic, metal)
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Bright or saturated background colors
3. Product Preparation
3.1 Cleaning
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Clean the product from any dust, stains, or imperfections.
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Unremovable artifacts will appear in the final model.
3.2 Shaping the Product
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Keep the shoe in shape with a properly positioned tongue.
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Avoid paper stuffing; use shoe trees or accessories matching the lining or transparent.
Note: All supports used to maintain shape will be visible in the 3D model.
3.3 Laces and Accessories
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Laces should be neatly arranged and tucked inside the shoe.
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Fix movable elements (e.g., tassels, charms) with small double-sided tape.
4. Image Capture Procedure
The product must be photographed in three steps: placed flat, turned on one side, and then on the opposite side.
4.1 Step 1 – Flat Position (108 Images)
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3 full 360° loops of 36 images (one every 10°):
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Loop 1: 10° angle
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Loop 2: 30° angle
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Loop 3: 50° angle
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4.2 Step 2 – Side A (72 Images)
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2 full 360° loops:
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Loop 1: 25° angle
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Loop 2: 50° angle
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4.3 Step 3 – Side B (72 Images)
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2 full 360° loops:
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Loop 1: 25° angle
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Loop 2: 50° angle
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4.4 Step 4 - Additional images
It can be helpful to capture additional close-up images of hidden or recessed parts of the object. For example, in the case of a shoe, capturing 7–10 images of the inner area (e.g., opening, insole, tongue) can improve the quality and completeness of the 3D model.
5. Objects that are difficult to scan
If you can't obtain a good 3D model of the object, it may be because of the object itself. Some objects are difficult to scan because of their shape, size, material, or color.
Transparent, reflective, and shiny objects are difficult to scan because they reflect the light and the camera can't capture the details of the object. If you want to scan these objects, you can use a mat spray to make the object less reflective and easier to scan.
If the object doesn't have enough details, the app will not be able to take reference points. Reference points can be corners, edges, colors, or patterns that the app uses to create the 3D model of the object. If the object doesn't have enough details, the app will not be able to create the 3D model of the object.
6. Final Considerations
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This workflow is valid for any product, regardless of size or morphology.
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Transparent and reflective materials often require post-processing even after mitigation.
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Product dimensions must be compatible with the physical setup (turntable diameter, rotating arm reach).
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Avoid blurred or shaky images; image sharpness is essential for accurate processing.