1. Solution Introduction

The 3D vision guidance solution captures and understands the 3D information of Target Objects and Scene Objects in the real environment through a 3D Camera, determines the relative vision pose relationship between the 3D Camera and the Robot through eye-hand calibration, and relies on the PickWiz vision system to establish real-time and reliable data transmission with the 3D Camera and the Robot, enabling accurate Robot picking and meeting the needs of various industrial scenarios such as sack and carton depalletizing, Random Picking, Ordered Loading and Unloading, and Positioning and Assembly.

Dexforce uses 2D recognition and detection methods to extract instances from the Scene, applies 3D localization to extract feature information from the instances and match them accurately, and configures the functions related to recognition and picking according to actual needs, thereby customizing suitable vision guidance solutions for different task scenarios.

The currently supported 2D recognition solutions and 3D Matching solutions are shown in the table below:

Solution	Model	Features	Limitations	Examples
2D recognition solutions: Segment instances from the Scene	General Model	Suitable for sacks, cartons, circles, cylinders, and quadrilaterals No training required, simple and easy to use	The General Model may detect unwanted workpieces. To retain only the workpieces you want to recognize, instance filtering is required.
	CAD-based Synthetic Data Training (One-click Connection)	Based on workpiece CAD and trained through One-click Connection Each workpiece type needs to train a separate model, with high recognition accuracy	Workpiece CAD is required to train the model, and each workpiece type needs a separate model Requires single-type incoming materials and high workpiece consistency Single-type incoming materials can be handled through the Recognition Type feature.	Data rendering: Actual Inference:
	Point Cloud Segmentation	Segment instances through Point Cloud clustering Suitable for bulk materials No training required, simple and easy to use	Requires separation between workpieces The workpiece Point Clouds must have no adhesion at all, including adhesion between workpieces and the bin
3D Matching solutions: Calculate the pose of the instance in the Camera coordinate system	Mask-based Pick Point Generation	Suitable for planar workpieces, such as sacks, cartons, pallets, sheet metal parts, etc. The system automatically generates Pick Points	/
	Basic Geometric Shape Fitting	Suitable for circular-surface, cylinder, and planar quadrilateral workpieces The system automatically generates Pick Points	/
	Rigid Transformation	Suitable for workpieces with significant differences between the front and back sides Fast speed Few parameters, easy to tune	Pick Points need to be configured manually on the workpiece page	Unsuitable scenario: identical front and back shapes
	3D Registration	Suitable for workpieces of different types, shapes, or sizes, and applicable to almost all scenarios	Pick Points need to be configured manually on the workpiece page Slow speed Many parameters, complex parameter tuning

In addition, Dexforce fully considers the special needs of different industrial scenarios and provides some optional functions for 3D vision guidance solutions:

• Vision Classification: Uses 2D depth features to classify instances. For usage, refer to Guide to Using Vision Classification

  • Principle: When calling PickWiz recognition, users manually select and classify images, extract the depth feature information of the images, and establish a category database. When calling PickWiz recognition, the features of the input image are extracted and compared with the features in the database to find the category that best matches the instance image.

  • Application scenarios: sack / carton classification, workpiece orientation classification, workpiece front-back classification, etc.

• Recognition Type: Uses One-click Connection to train a Deep Learning model capable of recognizing multiple materials. It is suitable for scenarios with many workpiece types and similar shapes. For usage, refer to Guide to Using Recognition Type

• Collision Detection: Detects collisions between the Tool and the bin to avoid collisions with the bin during Robot picking. For usage, refer to Guide to Using Collision Detection

  • Principle: Extract the bin Point Cloud of the actual Scene, calculate the template Point Cloud of the bin by using the bin dimensions entered in the Scene Object and quadrilateral fitting, and then perform fine matching between the fitted template Point Cloud and the bin Point Cloud of the actual Scene to obtain the final bin pose.

  • Large-range movement of the bin is allowed.

  • Deformed bins (concave inward or bulging outward) are not supported.

• Recognize Front and Back (via Point Cloud Template): Sets two workpiece template Point Clouds, estimates the poses of both templates, and finally outputs the pose with the highest score. It is often used in scenarios where the orientation of incoming workpieces is inconsistent and may be front side up or back side up. For usage, refer to Guide to Using Recognize Front and Back (via Point Cloud Template).

• Recognize Local Features: If a certain local feature of a workpiece remains basically unchanged between different workpieces and under different deformations of the same workpiece, this local feature can be used to localize the workpiece. For usage, refer to Guide to Using Recognize Local Features

• Instance Optimization: Uses large models to optimize the Masks after model recognition. It is commonly used in scenarios where the instance Masks are incomplete or excessive after recognition by the General Model / One-click Connection Vision Model. For usage, refer to Guide to Using Instance Optimization

• Divider and Bottom Support Detection: Picks dividers and bottom supports after workpiece picking is completed. For usage, refer to Guide to Using Divider and Bottom Support Detection

2. Solution Selection

Please select the appropriate task type in PickWiz according to the production scenario and workpiece type:

The 2D recognition solutions and 3D Matching solutions applied to each task type are shown in the table below:

Scene	task Type	Site Requirements		2D Recognition Solution	3D Matching Solution
Depalletizing	Single Sack Depalletizing	Single-type sacks with internal filling; avoid empty bags		General Sack Model	Mask-based Pick Point Generation
	Single Carton Depalletizing	Single-type cartons; avoid close adhesion and highly reflective tape		General Single-carton Depalletizing Model	Mask-based Pick Point Generation
Ordered Loading and Unloading	General Workpiece Ordered Loading and Unloading	Large front-back differences, orderly placement, single-type incoming materials, high workpiece consistency, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	Rigid Transformation
	Circle-based Ordered Loading and Unloading	Circular-surface workpieces, orderly placement, high-quality Point Clouds, and workpieces with clear edges		General Circle Model	Circle Shape Fitting
	Surface-type Workpiece Ordered Loading and Unloading	Surface-type workpieces, orderly placement, high workpiece consistency, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	3D Registration
	Surface-type Workpiece Ordered Loading and Unloading (Parallelized)	Surface-type workpieces, orderly placement, high workpiece consistency, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	3D Registration
	Surface-type Workpiece Ordered Loading and Unloading (Image Matching)	Surface-type workpieces, orderly placement, high workpiece consistency, and accessible workpiece CAD		Example-based Instance Segmentation	Feature Matching
	Cylinder-based Ordered Loading and Unloading	Cylinder workpieces, orderly placement, high-quality Point Clouds, and workpieces with clear edges	Cylinder height-to-radius ratio does not exceed 4:1	General Short-cylinder Model	Cylinder Shape Fitting
			Cylinder height-to-radius ratio exceeds 4:1	General Long-cylinder Model	Cylinder Shape Fitting
	Quadrilateral-based Ordered Loading and Unloading	Planar quadrilateral workpieces, orderly placement, single-type incoming materials, flat surfaces, and workpieces with clear edges		General Quadrilateral Model	Quadrilateral Fitting
Random Picking	General Workpiece Random Picking	Large front-back differences, random placement, high workpiece consistency, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	Rigid Transformation
	Surface-type Workpiece Random Picking	Surface-type workpieces, random placement, high workpiece consistency, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	3D Registration
	Surface-type Workpiece Loading and Unloading (Materials Isolated from Each Other)	Workpieces are separated from each other, and the workpiece Point Clouds have no adhesion at all		Point Cloud Segmentation	3D Registration/ Mask-based Pick Point Generation
	Circle-based Random Picking	Circular-surface workpieces, random placement, high-quality Point Clouds, and workpieces with clear edges		General Circle Model	Circle Shape Fitting
	Cylinder-based Random Picking	Cylinder workpieces, random placement, high-quality Point Clouds, and workpieces with clear edges	Cylinder height-to-radius ratio does not exceed 4:1	General Short-cylinder Model	Cylinder Shape Fitting
			Cylinder height-to-radius ratio exceeds 4:1	General Long-cylinder Model	Cylinder Shape Fitting
Positioning and Assembly	General Workpiece Positioning and Assembly	Only a single workpiece within the Camera field of view, large front-back differences, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	Rigid Transformation
	Surface-type Workpiece Positioning and Assembly	Only a single surface-type workpiece within the Camera field of view, large position changes, and accessible workpiece CAD		CAD-based Synthetic Data Training (One-click Connection)	3D Registration
	Surface-type Workpiece Positioning and Assembly (Point Cloud Matching Only)	Only a single surface-type workpiece within the Camera field of view, with small position changes		/	3D Registration
	Surface-type Workpiece Positioning and Assembly (Image Matching Only)	Only a single surface-type workpiece within the Camera field of view, with small position changes		/	Feature Matching

*Notes:

Corner-picking solution:

1. The model recognizes the carton and obtains the Mask of the carton
2. Image / Point Cloud preprocessing adjusts the Mask and removes the noise portion
3. Perform quadrilateral fitting on the Mask to obtain the fitted quadrilateral information (vertices, length and width information)
4. Extract the four vertices of the quadrilateral and sort them according to the image xy order to distinguish upper-left, upper-right, lower-left, and lower-right
5. If the carton body vertex option is selected, set the upper-left vertex on the long side of the carton as the upper-left vertex of the body, and reorder the vertices according to the length and width information
6. Perform plane fitting on the Mask to obtain the plane equation
7. Project the image coordinates onto the fitted plane based on the Intrinsic Parameter to obtain the final 3D coordinates of the vertex to be picked

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