Retrieving Pixel Values Code Snippet¶

This code snippet shows the recommended method (fastest) to access the pixel values in a BW8 image.

C++¶

#include <eVision/Easy/EImageBW8.h>

using namespace eVision;
EImageBW8 img;
uint8_t* pixelPtr;
uint8_t* rowPtr;
uint8_t  pixelValue;
uint32_t rowPitch;
int x, y;
int height(1080);
int width(1920);
rowPtr = reinterpret_cast <uint8_t*>(img.GetImagePtr());
rowPitch = img.GetRowPitch();

for (y = 0; y < height; y++)
{
  pixelPtr = rowPtr;

  for (x = 0; x < width; x++)
  {
    pixelValue = *pixelPtr;

    // Add your pixel computation code here

    *pixelPtr = pixelValue;
    pixelPtr++;
  }

  rowPtr += rowPitch;
}

C#¶

using System;
using System.Runtime.InteropServices;

using eVision;

IntPtr pixAddr;
byte pix;
EImageBW8 bw8Image = new EImageBW8();
int height = 1080;
int width = 1920;
//...
for (int y = 0; y < height; ++y)
{
  pixAddr = bw8Image.GetImagePtr(0, y);
  for (int x = 0; x < width; ++x)
    pix = Marshal.ReadByte(pixAddr, x);
}

Python¶

import eVision
import numpy as np

img = eVision.EImageBW8()

np_view = np.asarray(img.PixelView)

for row in np_view:
    for pixel in row:
        # Add your pixel computation code here
        pass