I have succesfully created AdaptiveThreshold application using Vision Assistant for image with gradient illumination. It is working perfectly.
Then i generated .NET code from the project. The problem is, .NET code always produce error when i ran the application. The error came up when i want to apply LowPass filter.
Here is the code generated by Vision Assistant (i also attached the complet VS project and the sample image on the folder):
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Text;
using NationalInstruments.Vision.WindowsForms;
using NationalInstruments.Vision;
using NationalInstruments.Vision.Analysis;
using Vision_Assistant.Utilities;
namespace Vision_Assistant
{
static class Image_Processing
{
//public static ReadTextReport vaOCRReport;
public static PaletteType ProcessImage(VisionImage image)
{
// Initialize the IVA_Data structure to pass results and coordinate systems.
IVA_Data ivaData = new IVA_Data(9, 0);
// Image Buffer: Push
Functions.IVA_PushBuffer(ivaData, image, 0);
// Extract Color Plane
using (VisionImage plane = new VisionImage(ImageType.U8, 7))
{
// Extract the luminance plane and copy it to the main image.
Algorithms.ExtractColorPlanes(image, ColorMode.Hsl, null, null, plane);
Algorithms.Copy(plane, image);
}
// Filters: Low Pass - Filters an image using a non-linear filter.
VisionImage lowpassImage = new VisionImage(ImageType.U8);
Algorithms.LowPass(image, lowpassImage, new LowPassOptions(25, 25, 5));
// Image Buffer: Push
Functions.IVA_PushBuffer(ivaData, image, 1);
// Operators: Subtract Image
Algorithms.Subtract(image, Functions.IVA_GetBuffer(ivaData, 0), image);
// Thresholds an image into 2 classes by using local thresholding.
LocalThresholdOptions vaLocalThresholdOptions = new LocalThresholdOptions();
vaLocalThresholdOptions.DeviationWeight = 0;
vaLocalThresholdOptions.Method = LocalThresholdMethod.NiBlack;
vaLocalThresholdOptions.ParticleType = ParticleType.Bright;
vaLocalThresholdOptions.ReplaceValue = 1;
vaLocalThresholdOptions.WindowHeight = 50;
vaLocalThresholdOptions.WindowWidth = 50;
Algorithms.LocalThreshold(image, image, vaLocalThresholdOptions);
// Filters an image using a non-linear filter.
// First, increase the border size, if necessary.
if (image.BorderWidth < Math.Max(3, 3))
{
image.BorderWidth = Math.Max(3, 3);
}
// For each pixel, the algorithm takes the neighborhood specified by the given filter sizes
// and replaces the pixel with the nth smallest value in the neighborhood.
Algorithms.NthOrder(image, image, 3, 3, (int)Math.Floor(3 * 3 / 2.0));
// Lookup Table: Equalize
// Calculates the histogram of the image and redistributes pixel values
// accross the desired range to maintain the same pixel value distribution.
Range equalizeRange = new Range(0, 255);
if (image.Type != ImageType.U8)
{
equalizeRange.Maximum = 0;
}
Algorithms.Equalize(image, image, null, equalizeRange, null);
// Lookup Table: Reverse - Inverts the pixel intensities of the image.
Algorithms.Inverse(image, image, null);
return PaletteType.Binary;
}
}
}
Please help.
Best Regards
