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eVision 26.10.0 documentation
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eVision 26.10.0 documentation
  • What’s New
    • Release notes
      • Release notes 26.10
    • Changelog History
  • Getting Started with eVision
    • Installing eVision
    • Managing your Licenses
    • First Steps with eVision
    • eVision Studio
      • Navigating the Interface
      • Running Tools on Images
      • Displaying Images
      • Working with a Region
    • Neo Licensing System Documentation
      • Using the User Interface
      • Using the Online Command Line
      • Using the Offline Command Line
      • Neo Licensing System FAQ
  • Using eVision
    • Basic Operations
      • Image Operations
        • Pixel Containers and Files
        • Loading a Pixel Container File
        • Saving a Pixel Container File
        • Memory Allocation
        • 3D Rendering of 2D Images
      • Regions and ROIs
        • Regions Of Interest (ROI)
        • Arbitrarily Shaped ROI (ERegion)
        • Flexible Masks
      • Frames and Alignment
      • Common Data Types
        • Vectors
        • Geometrical Shapes
      • Error Reporting
      • Drawing and Graphical Interactions
      • Utility Functions
        • Timing
        • Locating Installation Folders
    • General Purpose Libraries
      • EasyImage - Pre-Processing Images
        • Pixel Operations
          • Intensity Transformation
          • Thresholding
          • Arithmetic and Logic
          • Overlay
        • Filtering
          • Linear Filtering
          • Non-Linear Filtering
          • Noise Reduction and Estimation
          • Gabor Filter
          • Fourier Transform
        • Geometric Operations
          • Geometric Transforms
          • Operations on Interlaced Video Frames
        • Feature Extraction and Statistics
          • Scalar Gradient
          • Canny Edge Detector
          • Harris Corner Detector
          • Vector Operations
          • Computing and Using Image Statistics
          • Straight Line Detector
        • Image Composition
          • HDR Fusion
          • Image Stitching
      • EasyColor - Pre-Processing Color Images
        • Using EasyColor
        • EasyColor - Lookup Table Operations
        • EasyColor - Bayer Conversion
    • Matching and Measurement
      • EasyObject - Analyzing Blobs
        • Process and Workflow
        • EasyObject - Encoding an Image
        • Objects, Holes and their Features
        • Selecting and Sorting Blobs
        • Object Template Matcher
        • EChecker - Validating Golden Templates
      • EasyGauge - Measuring down to Sub-Pixel
        • Principles of EasyGauge
        • Gauge Types
        • Measurement and Fitting Parameters
        • Advanced Usage
        • Display and Graphical Manipulation
        • Differences with the Legacy API
        • Legacy EasyGauge
          • Workflow
          • Gauge Definitions
          • Find Transition Points Using Peak Analysis
          • Find Shapes Using Geometric Models
          • Gauge Manipulation: Draw, Drag, Plot, Group
          • Calibration and Transformation
          • Calibration Using EWorldShape
          • The Calibration Model
          • Unwarp an Image
      • EasyFind - Matching Geometric Patterns
        • Purpose and Principles
        • Learn a Pattern from Image(s)
        • Learn a Pattern from Vectors
        • Find Matches
      • EasyMatch - Matching Area Patterns
        • Learn a Pattern
        • Find Matches
    • Text and Code Reading
      • EasyBarCode - Reading Bar Codes
        • Using EasyBarCode
        • EasyMailBarCode - Reading Mail Bar Codes
        • EasyBarCode1 - Reading Bar Codes (deprecated)
      • EasyDeepOCR - Reading Texts with Deep Learning
        • EasyDeepOCR Principles and Workflow
        • EasyDeepOCR Detailed Usage
        • EasyDeepOCR Setting the Parameters
        • EasyDeepOCR Retraining a Model
      • EasyOCR - Reading Texts
        • Using EasyOCR
      • EasyOCR2 - Reading Complex Texts
        • Using EasyOCR2
        • EasyOCR2 Advanced Parameters
      • EasyMatrixCode - Reading Matrix Codes
        • Specifications and Supported Symbols
        • Using EasyMatrixCode
        • EasyMatrixCode1 (deprecated)
          • Specifications
          • Supported Symbols
          • Workflow
          • Learning a Matrix Code
          • Computing the Print Quality
          • Using GS1 Data Matrix Codes
      • EasyQRCode - Reading QR Codes
        • Specifications
        • Using EasyQRCode
      • ECodeReader - Unified Interface
      • List of Supported Codes
      • Code Grading
        • ISO/IEC 15416 for 1D Bar Codes
        • ISO/IEC 15415 for Data Matrix and QR Codes
        • ISO/IEC 29158 for Data Matrix and QR Codes
        • SEMI T10-0701 for Data Matrix Codes
      • Comparison of OCR methods
    • Deep Learning Inspection
      • Deep Learning Studio
      • Workflow
        • Choose Your Tool
        • Managing the Dataset and the Annotations
        • Managing the Dataset Splits
        • Using Data Augmentation
        • Training a Deep Learning Tool
        • Using a Deep Learning Tool
        • Benchmarking a Deep Learning Tool
      • Execution Settings and Hardware Support (CPU/GPU)
      • Specifications
      • EasyClassify - Multi-label Image Classification
      • EasySegment - Detecting and Segmenting Defects
        • EasySegment Unsupervised
        • EasySegment Supervised
      • EasyLocate - Locating Objects and Defects
    • 3D Processing
      • Easy3D - Tools for 3D Object Processing
        • Base Types
        • Depth Maps
        • Point Clouds
        • Meshes
        • ZMaps
        • 3D Filters and Statistics
        • 3D Viewer
        • Photometric Stereo
      • Easy3DLaserLine - Laser Line Extraction and Calibration
        • Laser Triangulation and Extraction
        • Line Extraction Benchmark
        • Calibration
      • Easy3DObject - Extracting 3D Objects
        • Object Features
        • Extracting and Using Objects
      • Easy3DMatch - 3D Alignment and Comparison
        • Alignment, Comparison and Matching
        • 3D Sensor Fusion
    • Live Image Acquisition
      • EGrabberBridge - Using Images from eGrabber Sources
      • VimbaXBridge - Using Images from VimbaX Sources
    • Advanced Operations
      • Camera Calibration
        • Calibration Modes and Models
        • Computing the Calibration Model
        • Unwarping an Image
      • Multicore Processing
    • Applicative Processing (Discontinued)
      • EasySpotDetector - Detecting Spots with Deep Learning
        • Using EasySpotDetector
  • Resources
    • Code Snippets
      • Basic Operations Code Snippets
        • Basic Types Code Snippets
          • Calibration Code Snippets
            • Dot Grid-Based Calibration Code Snippet
            • Landmark-Based Calibration Code Snippet
            • Calibration by Guesswork Code Snippet
            • Coordinates Transform Code Snippet
            • Image Unwarping Code Snippet
          • Loading and Saving Images Code Snippet
          • Interfacing Third-Party Images Code Snippet
          • Retrieving Pixel Values Code Snippet
          • Importing Bitmap from the Resources Code Snippet
          • ROI Placement Code Snippet
          • Vector Management Code Snippet
          • Exception Management Code Snippet
        • ERegion Code Snippets
          • Basic Usage of Region Code Snippet
          • Preparing a Region Code Snippet
          • Combining Regions Code Snippet
          • Converting a Result to a Region Code Snippet
      • General Purpose Libraries Code Snippets
        • EasyImage Code Snippets
          • Thresholding Code Snippets
            • Single Thresholding Code Snippet
            • Double Thresholding Code Snippet
            • Histogram-Based Single Thresholding Code Snippet
            • Histogram-Based Double Thresholding Code Snippet
          • Arithmetic and Logic Operations Code Snippet
          • Convolution Code Snippets
            • Pre-Defined Kernel Filtering Code Snippet
            • User-Defined Kernel Filtering Code Snippet
          • Non-Linear Filtering Code Snippets
            • Morphological Filtering Code Snippet
            • Hit-and-Miss Transform Code Snippet
          • Vector Operations Code Snippets
            • Path Sampling Code Snippet
            • Profile Sampling Code Snippet
          • Statistics Code Snippets
            • Image Statistics Code Snippet
            • Sliding Windows Statistics Code Snippet
            • Histogram-Based Statistics Code Snippet
          • Noise Reduction by Integration Code Snippets
            • Temporal Noise Reduction Code Snippet
            • Recursive Average Code Snippet
          • Feature Point Detectors Code Snippets
            • Harris Corner Detector Code Snippet
            • Canny Edge Detector Code Snippet
          • Using an ERegion Code Snippet
          • Warping Code Snippets
            • Performing a Ring Warping Code Snippet
            • Performing an Inverse Warping Code Snippet
          • Fourier Transform Code Snippets
            • Performing a Direct Fourier Transform Code Snippet
            • Performing an Inverse Fourier Transform Code Snippet
          • HDR Fusion Code Snippets
            • Performing a HDR Fusion Using the Default Algorithm Code Snippet
            • Performing a HDR Fusion Using Specific Algorithms Code Snippet
            • Changing the HDR Fusion Algorithm or its Parameters Code Snippet
          • Performing a Resize Operation Code Snippet
          • Image Stitching Code Snippets
            • Basic Image Stitching Code Snippet
            • Image Stitching with a Reference Image Code Snippet
            • Incremental Image Stitching Code Snippet
            • Image Stitching with Learning Code Snippet
          • Gabor filter Code Snippet
          • Scalar Gradient Code Snippet
          • Overlay Code Snippet
          • Intensity Transformation Code Snippets
            • Normalization Code Snippet
            • Normalization using a LUT Code Snippet
        • EasyColor Code Snippets
          • Colorimetric Systems Conversion Code Snippet
          • Color Components Code Snippet
          • White Balance Code Snippet
          • Pseudo-Coloring Code Snippet
          • Bayer Pattern Decoding Code Snippet
      • Matching and Measurement Code Snippets
        • EasyObject Code Snippets
          • Image Segmenter Code Snippet
          • Continuous Mode Code Snippet
          • Holes Extraction Code Snippet
          • Computing Blobs Features Code Snippet
          • Looping over the runs of an object Code Snippet
          • Selecting and Sorting Blobs Code Snippet
          • Using the Object Template Matcher Code Snippet
          • EChecker Code Snippets
            • EChecker with a Single Image Code Snippet
            • EChecker with Multiple Images Code Snippet
        • EasyMatch Code Snippets
          • Pattern Learning Code Snippet
          • Setting Search Parameters Code Snippet
          • Pattern Matching and Retrieving Results
          • Pattern Learning with ERegion Code Snippet
        • EasyFind Code Snippets
          • Pattern Learning Code Snippet
          • Setting Search Parameters Code Snippet
          • Pattern Finding and Retrieving Results Code Snippet
          • Learning Using a DXF File Code Snippet
          • EasyFind Legacy API Code Snippets
            • Learning Using an EPolygonShape Code Snippet (Legacy)
        • EasyGauge Code Snippets
          • Point Location Code Snippet
          • Line Fitting Code Snippet
          • Circle Fitting Code Snippet
          • Rectangle Fitting Code Snippet
          • Wedge Fitting Code Snippet
          • Gauge Grouping Code Snippets
            • Complex Gauge Measurement Code Snippet
            • Legacy EasyGauge Gauge Grouping Code Snippets
              • Complex Gauge Measurement Code Snippet (Legacy)
              • Gauge Hierarchy Code Snippet (Legacy)
          • Calibration using EWorldShape Code Snippets (Legacy)
            • Calibration by Guesswork Code Snippet (Legacy)
            • Landmark-Based Calibration Code Snippet (Legacy)
            • Dot Grid-Based Calibration Code Snippet (Legacy)
            • Coordinates Transform Code Snippet (Legacy)
            • Image Unwarping Code Snippet (Legacy)
          • Legacy EasyGauge Code Snippets
            • Point Location Code Snippet (Legacy)
            • Line Fitting Code Snippet (Legacy)
            • Circle Fitting Code Snippet (Legacy)
            • Wedge Fitting Code Snippet (Legacy)
            • Rectangle Fitting Code Snippet (Legacy)
      • Text and Code Reading Code Snippets
        • EasyBarCode Code Snippets
          • Reading a Bar Code Code Snippet
          • Reading a Bar Code Following a Given Symbology Code Snippet
          • Reading a Grid of Bar Codes Code Snippet
          • Learning a Bar Code Code Snippet
          • Grading a Bar Code Code Snippet
          • Reading a Mail Bar Code Code Snippet
          • Reading a Bar Code Code Snippet
          • Reading a Bar Code Following a Given Symbology Code Snippet
          • Reading a Bar Code of Known Location Code Snippet
        • EasyDeepOCR Code Snippets
          • Reading a Text Code Snippet
          • Get Score Code Snippet
          • Specifying a Topology Code Snippet
          • Building a Sample List Code Snippet
          • Performing an Optimization Code Snippet
          • Splitting the Pipeline Code Snippet
          • Training and Using a Custom Model Code Snippet
        • EasyOCR Code Snippets
          • Learning Characters Code Snippet
          • Recognizing Characters Code Snippet
        • EasyOCR2 Code Snippets
          • Detecting Characters Code Snippet
          • Learning Characters Code Snippet
          • EasyOCR2 Reading Characters Code Snippets
            • Reading Using TrueType Fonts Code Snippet
            • Reading Using EOCR2 Character Database Code Snippet
            • Reading Using EOCR2 Model File Code Snippet
          • View Bitmap Code Snippet
        • EasyMatrixCode Code Snippets
          • Reading Data Matrix Codes Code Snippet
          • Learning a Data Matrix Code Code Snippet
          • Reading a Grid of Matrix Codes Code Snippet
          • Grading a Data Matrix Code Code Snippet
          • Reading Matrix Codes from Several Images Using Asynchronous Processing Code Snippet
          • Reading a Data Matrix Code Code Snippet
          • Learning a Data Matrix Code Code Snippet
          • Tuning the Search Parameters Code Snippet
          • Grading a Data Matrix Code Code Snippet
        • EasyQRCode Code Snippets
          • Reading QR Codes Code Snippet
          • Grading a QR Code Code Snippet
          • Reading a Grid of QR Codes Code Snippet
          • Retrieving Information of a QR Code Code Snippet
          • Tuning the Search Parameters Code Snippet
          • Retrieving the Decoded String Code Snippet (Simple)
          • Retrieving the Decoded String Code Snippet (Safe)
          • Retrieving the Decoded Data Code Snippet (Advanced)
        • ECodeReader Code Snippets
          • Reading a set of Code Code Snippet
      • Deep Learning Libraries Code Snippets
        • EasyClassify Code Snippets
          • Creating a Dataset and Training a Classifier Code Snippet
          • Learning Out Of Distribution parameters in a previously trained classifier Code Snippet
          • Loading a Classifier and Classifying a New Image Code Snippet
          • Using Multithreading for Classification Code Snippet
          • Using Out Of Distribution scores during classification Code Snippet
        • EasySegment Code Snippets
          • Creating a Dataset and Training a Supervised Segmenter Code Snippet
          • Creating a Dataset and Training an Unsupervised Segmenter Code Snippet
          • Loading a Supervised Segmenter and Segmenting an Image Code Snippet
          • Loading an Unsupervised Segmenter and Segmenting an Image Code Snippet
        • EasyLocate Code Snippets
          • Creating a Dataset and Training a Locator Code Snippet
          • Loading a Locator and Locating Objects on a New Image Code Snippet
      • 3D Processing Libraries Code Snippets
        • Easy3D Code Snippets
          • Using EFilters to Remove the Noise on a ZMap Based on the Standard Deviation Code Snippet
          • Using EFilters to Remove the Noise on a ZMap Based on the Derivation from Neighborhood Code Snippet
          • Aligning Point Clouds Code Snippet
          • Reducing the Size of a Cloud with Random Decimation Code Snippet
          • Reducing the Size of a Cloud with Grid Decimation Code Snippet
          • Using Photometric Stereo Code Snippet
          • Using Flat Images to Improve Photometric Stereo Code Snippet
          • Performing Plane Leveling on Point Clouds Code Snippet
          • Performing ZMap Leveling Code Snippet
          • Using an ERegion to Crop a ZMap Code Snippet
          • Add an Attribute to an EPointCloud with Initial Data Code Snippets
          • Add an Attribute to an EPointCloud without Initial Data Code Snippet
          • Retrieve an Attribute from an EPointCloud Code Snippet
        • Easy3DLaserLine Code Snippets
          • Object-Based Calibration Code Snippet
          • Load Object-Based Calibration Model Code Snippet
        • Easy3DMatch Code Snippets
          • E3DAligner Minimal Code Snippet
          • E3DAligner Reprojection Plane Code Snippet
          • E3DAlignment Align Code Snippet
          • E3DComparer Minimal Code Snippet
          • E3DComparer Advanced Code Snippet
          • E3DMatcher Minimal Sample
          • E3DMatcher Advanced Code Snippet
          • EPointCloudMerger Sample
        • Easy3DObject Code Snippets
          • Extracting 3D Objects with a Selection Criterion Code Snippet
          • Inspecting a Feature from the List of E3DObjects Code Snippet
          • Drawing 2D Features from a List of E3DObjects Code Snippet
          • Drawing 3D Features from a List of E3DObjects Code Snippet
      • Applicative Processing Libraries Code Snippets
        • EasySpotDetector Code Snippets
          • Detect Spots Code Snippet
          • Detect Scratches Code Snippet
          • Detect and Classify Spots Code Snippet
      • Live Image Acquisition Code Snippets
        • EGrabberBridge Code Snippets
          • Using EGrabberBridge Code Snippet
          • Using EGrabberBridge with Format Conversion Code Snippet
          • Managing EGrabber Parameters Code Snippet
          • Using EGrabber Discovery Code Snippet
        • VimbaX Bridge Code Snippets
          • Using VimbaXBridge Code Snippet
    • Sample Programs
      • Image Processing Sample Programs
        • Basic Sample Program
        • BasicWPF Sample Program
        • ConsoleBasic Sample Program
        • Region Sample Program
        • RegionFreeHand Sample Program
        • EasyImageFilter Sample Program
        • FourierFiltering Sample Program
        • EasyColorComponent Sample Program
        • EasyHDRFusion Sample Program
        • EGrabberBridge Sample Program
        • SharedLibraryConsole Sample Program
      • 3D Processing Sample Programs
        • Easy3DViewer Sample Program
        • Easy3DViewerWPF Sample Program
        • Easy3DPhotometricStereo Sample Program
        • Easy3DPointCloudToMesh Sample Program
        • Easy3DZMapGenerator Sample Program
        • Easy3DProcessing2D Sample Program
        • Easy3DMultiViews Sample Program
        • Easy3DPCBWarpage Sample Program
        • Easy3DCoaxlinkLLE Sample Program
        • Easy3DLaserLineCalibration Sample Program
        • Easy3DLaserLineExtract Sample Program
        • Easy3DObjectExtract Sample Program
        • Easy3DMatchMatch Sample Program
        • Easy3DMatchAlign Sample Program
        • Easy3DMatchPointCloudMerger Sample Program
      • Matching and Measurement Sample Programs
        • EasyGaugeBasic Sample Program
        • EasyGaugeRegion Sample Program
        • EasyGaugePolygon Sample Program
        • EasyFindLearn Sample Program
        • EasyFindVectorLearn Sample Program
        • EasyMatchLearn Sample Program
        • EasyObjectEChecker2 Sample Program
        • EasyObjectInertia Sample Program
      • Deep Learning Inspection Sample Programs
        • EasyClassifyTrain Sample Program
        • EasyClassifyInference Sample Program
        • EasyClassifyMultiThreadInference Sample Program
        • EasySegmentSupervisedTrain Sample Program
        • EasySegmentSupervisedInference Sample Program
        • EasySegmentSupervisedMultiThreadInference Sample Program
        • EasySegmentUnsupervisedTrain Sample Program
        • EasySegmentUnsupervisedInference Sample Program
        • EasyLocateTrain Sample Program
        • EasyLocateInference Sample Program
        • EasyLocateMultiThreadInference Sample Program
      • Text and Code Reading Sample Programs
        • EasyCodeReading Sample Program
        • EasyBarCodeRead Sample Program
        • EasyBarCodeReadMail Sample Program
        • EasyMatrixCodeRead Sample Program
        • EasyQRCodeRead Sample Program
        • EasyOcrRead Sample Program
        • EasyOcr2Read Sample Program
        • EasyDeepOCRRead Sample Program
        • EasyDeepOCRReadConsole Sample Program
      • Applicative Processing Tools Sample Programs
        • EasySpotDetector Sample Program
      • Python Specific Sample Programs
        • egrabber_acquisition Sample Program
        • openCV_acquisition (OpenCV Camera Acquisition) Sample Program
        • easy3d_viewer Sample Program
        • easy_find_learn Sample Program
        • easy_gauge_basic Sample Program
        • vimbax_acquisition Sample Program
        • Base Web Sample Program
        • Basic Tkinter Sample Program
    • Application Examples
      • Inspecting Fuses
      • Inspecting Pads Using Regions
      • Checking Lot Codes and Mixing with OCR
      • Measuring a Remote Controller
      • Inspecting a PCB
      • Measuring the Warpage of a PCB
  • Download eVision

Api Documentation

  • C++ Api Documentation
  • .NET Api Documentation
  • Python API Documentation
  • Library API Guide
    • Base Classes API Guide
      • Easy Class API Guide
      • Image and ROI Classes API Guide
      • Region Classes API Guide
    • General Purpose API Guide
      • EasyImage API Guide
      • EasyColor API Guide
    • Matching and Measurement API Guide
      • EasyObject API Guide
        • EasyObject API Guide (Legacy)
      • EasyMatch API Guide
      • EasyFind API Guide
      • EasyGauge API Guide
        • EasyGauge API Guide (Legacy)
    • Text and Code Reading API Guide
      • EasyBarCode API Guide
      • EasyDeepOCR API Guide
      • EasyOCR API Guide
      • EasyOCR2 API Guide
      • EasyMatrixCode API Guide
      • EasyQRCode API Guide
    • Deep Learning API Guide
      • EasyClassify API Guide
      • EasySegment API Guide
      • EasyLocate API Guide
    • 3D Processing API Guide
      • Easy3D API Guide
      • Easy3DLaserLine API Guide
      • Easy3DMatch API Guide
      • Easy3DObject API Guide
    • Applicative Processing API Guide
      • EasySpotDetector API Guide
  • Deprecation History

About

  • Conventions
    • Image and Depth Map Buffer
    • Image Coordinate Systems
    • Conventions for Strings
    • eVision Version Numbering
  • Glossary
  • Third Party Licenses
  • Open eVision Documentation
  • About Documentation
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Text and Code Reading Code Snippets¶

This section provides code snippets for the Text and Code Reading eVision libraries.

EasyBarCode
EasyBarCode
EasyBarCode Code Snippets
EasyDeepOCR
EasyDeepOCR
EasyDeepOCR Code Snippets
EasyOCR
EasyOCR
EasyOCR Code Snippets
EasyOCR2
EasyOCR2
EasyOCR2 Code Snippets
EasyQRCode
EasyQRCode
EasyQRCode Code Snippets
EasyMatrixCode
EasyMatrixCode
EasyMatrixCode Code Snippets
ECodeReader
ECodeReader
ECodeReader Code Snippets
Next
EasyBarCode Code Snippets
Previous
Rectangle Fitting Code Snippet (Legacy)
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