Image Processing in C & Verilog

In this repository there are some image processing algorithms implemented using C and Verilog, and then use Python3 to compare the result whether there is any difference.

Table of Contents

• Table of Contents
• Contents
  • Load Image
  • BGR to Gray
  • Binarization
  • Mean Filter
  • Median Filter
• Image Processing Flow
• Tools

Contents

Load Image

Read image from BMP (bitmap) file, and then write it into another.

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Input	Output

BGR to Gray

Read image from BMP (bitmap) file, and then convert it (BGR image) to grayscale.

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Input	Output

Binarization

Read image from BMP (bitmap) file, and then convert it (BGR image) to grayscale. Finally, set pixels to white or black determined by threshold.

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Input	Output (threshold: 8'd127)

Mean Filter

Read image from BMP (bitmap) file, and then use mean filter to blur image.

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Input	Output (filter size: 3)

Median Filter

Read image with salt and pepper noise from BMP (bitmap) file, and then use median filter to remove noise.

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Input	Output (filter size: 3)

Image Processing Flow

%%{
  init: {
    'theme': 'neutral',
    'themeVariables': {
      'textColor': '#000000',
      'noteTextColor' : '#000000',
      'fontSize': '20px'
    }
  }
}%%

flowchart LR
    b0[                  ] --- b2[ ] --- b4[ ] --- ProcessingFlow --- b1[ ] --- b3[ ] --- b5[                  ]
    style b0 stroke-width:0px, fill: #FFFFFF00, color:#FFFFFF00
    style b1 stroke-width:0px, fill: #FFFFFF00
    style b2 stroke-width:0px, fill: #FFFFFF00
    style b3 stroke-width:0px, fill: #FFFFFF00
    style b4 stroke-width:0px, fill: #FFFFFF00
    style b5 stroke-width:0px, fill: #FFFFFF00, color:#FFFFFF00

    linkStyle 0 stroke-width:0px
    linkStyle 1 stroke-width:0px
    linkStyle 2 stroke-width:0px
    linkStyle 3 stroke-width:0px
    linkStyle 4 stroke-width:0px
    linkStyle 5 stroke-width:0px
    
    subgraph ProcessingFlow
    direction TB
    style ProcessingFlow fill:#ffffff00, stroke-width:0px

    direction TB
        A[Put BMP image to ROM]
        A --> B[Read BMP Header from ROM]
        B --> C[Write BMP Header to RAM]
        C --> D[Read BMP Pixel Data from ROM]
        D --> E[Computer Vision Algorihtm]
        E --> F[Write BMP Pixel Data to RAM]
        style A fill:#74c2b5,stroke:#000000,stroke-width:4px
        style B fill:#f8cecc,stroke:#000000,stroke-width:4px
        style C fill:#fff2cc,stroke:#000000,stroke-width:4px
        style D fill:#cce5ff,stroke:#000000,stroke-width:4px
        style E fill:#fa6800,stroke:#000000,stroke-width:4px
        style F fill:#ff6666,stroke:#000000,stroke-width:4px
    end

Loading

Tools

• GNU Compiler Collection
• Icarus Verilog
• GTKWave
• Python3