MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guida Utente Pagina 19
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Key Blockset Con cepts
Key Blockset Concepts
In this section, you learn how the VideoandImageProcessing Blockset blocks
interpret input matrices and arrays. Images are real-valued o rdered sets of
color or intensity data. The blocks interpret input matrices as images, where
each element of the matrix corresponds to a single pixel in the d isplayed
image. Video data is a series o f images over time. All blocks in Video a nd
Image Proces s in g Blockset can pr ocess images or vid eo data.
This section includes the following topics:
• “Image Types” on page 1-12 — Learn how to represent binary, intensity,
and RGB images
• “Video in Video and Image Processing Blockset” on page 1-12 — Understand
the representation of video
• “Defining Intensity and Color” on page 1-13— Learn how data type
determines w hich values correspondtoblackandwhiteaswellasthe
absence or saturation of color
• “Color Image Processing” on page 1-14 — Work with color images and video
signalsas3-Darrays
• “Coordinate Systems” on page 1-19— Learn how pixel and spatial
coordinate systems are defined in Video and Image Processing Blockset
• “Image Data Stored in Column-Major Format” on page 1 -21 — Learn how
the blockset stores image data
• “Sample Time” on page 1-21 — Learn how a block’s sample time determ ines
when the code b ehind each block is executed
• “Video Duration and Simulation Time” on page 1-22 — Learn how to
control the duration of the simulation
• “Normal and Accelerator Mode” on page 1-23 — Learn h ow to improv e the
performan c e of larger Simulink models
• “Strategies for R eal-Time Video Processing” on page 1-24 — Optimize your
modeltoachievereal-timevideoprocessing
• “Code G eneration” on page 1-26 — Unders tand when
vip_rt.dll is needed
to run executables generated for certain targets
1-11
- VideoandImagePro 1
- User’s Guide 1
- 508-647-7000 (Phone) 2
- 508-647-7001 (Fax) 2
- The MathWorks, Inc 2
- 3 Apple Hill Drive 2
- Natick, MA 01760-2098 2
- Revision History 3
- Contents 5
- Working with MPlay 6
- Conversions 6
- Getting Started 9
- 1 Gettin g Started 10
- Installation 11
- Product Demos 13
- Viewing the Documentation 15
- What Chapter Should I Read? 17
- Key Blockset Concepts 19
- Defining Intensity and Color 21
- From File block dialog box 23
- Key Blockset Con cepts 25
- Coordinate Systems 27
- Sample Time 29
- Normal and Accelerator Mode 31
- Neares t neighbor 33
- Block Data Type Support 36
- Image Credits 40
- Importing and Exporting 41
- Working with AVI Files 42
- Exporting to AVI Files 46
- Same as input 47
- Importing and Exporting Video 48
- Intensity 50
- [[5 10]' [80 10]'] 54
- %d' 55
- '%s region 57
- 'Frame %d' 59
- Video only 60
- WorkingwithMultimediaFiles 65
- Separate color signals 66
- Exportin 67
- Fi xed- step 70
- Working with Audio 71
- Working with Multimedia Files 73
- 3 Working with MPlay 78
- Viewing Video Files 82
- 7 Experim 85
- IntensitytoBinaryConversion 88
- 4 Positi 89
- Connect the 91
- Autothreshold Block 93
- Color Space Conversion 100
- 4 Conversions 102
- Chroma Resampling 105
- Symmetric 107
- No pad ding 107
- Fixe d-st ep 111
- Geometric Transformation 113
- Interpolation Overview 114
- Bilinear Interpo lation 115
- 5 Geometri c Transformation 116
- 0 0 0 1 1 2 2 3 3 0 0 0 0 117
- 0 0 0 4 4 5 5 6 6 0 0 0 0 117
- 0 0 0 7 7 8 8 9 9 0 0 0 0 117
- Rotating an Image 118
- Expanded to fit 121
- Free running 121
- Resizing an Image 125
- Cropping an Image 132
- Morphological Operations 139
- Over view of Morphology 140
- CountingObjectsinanImage 141
- 6 Morphological Operations 142
- 'disk',15) 151
- Analysis and Enhancement 157
- Feature Extraction 158
- 7 Analysis and Enhancement 160
- Finding Lines in Images 165
- Zero-based 169
- Image Enhancement 183
- Separat e color signals 185
- I array at the output ports 185
- Separate color signals 185
- Pixel Statistics 215
- Separate color signa ls 217
- Example Applications 223
- Pattern Matching 224
- 8 Example Applications 226
- Fixed-step 229
- Motion Compensation 231
- Image Compression 233
- Accelerator mode 1-23 247
- Normal and Accelerator 1-23 250
- Normal mode 1-23 250
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