private IEnumerable <IEnumerable <CsvRow> > ProcessImageGetLettersFromPage(Image <Rgba32> image, QrReaderData qrData)
{
var rowsPerPage = (int)Math.Ceiling(qrData.MetaData.DataChunkSize / (double)DataOutput.MaxLettersPerRow);
var letters = new List <CsvRow>((int)qrData.MetaData.DataChunkSize);
var lettersFallback = new List <CsvRow>((int)qrData.MetaData.DataChunkSize);
var nextY = 0;
for (var y = 0; y < rowsPerPage; y++)
{
var nextRowContentArea = image.GetNextRowContentArea(nextY);
nextY = nextRowContentArea.Y + nextRowContentArea.Height;
var rowImage = image.Clone(img => img.Crop(nextRowContentArea));
var currentRowLetters = y == rowsPerPage - 1
? qrData.MetaData.DataChunkSize - DataOutput.MaxLettersPerRow * y : DataOutput.MaxLettersPerRow;
var nextX = 0;
for (var x = 0; x < currentRowLetters; x++)
{
var nextLetterContentArea = rowImage.GetNextLetterContentArea(nextX);
nextX = nextLetterContentArea.X + nextLetterContentArea.Width;
var letterImage = rowImage.Clone(img =>
img.Crop(nextLetterContentArea));
using (var memoryStream = new MemoryStream())
{
letterImage.SaveAsBmp(memoryStream);
memoryStream.Seek(0, 0);
letters.Add(new CsvRow(_columnNameToIndex, LoadImageHelper.FileAsData(memoryStream)));
lettersFallback.Add(new CsvRow(_columnNameToIndex, LoadImageHelper.FileAsData(memoryStream, threshold: 90)));
}
}
}
return(new List <IEnumerable <CsvRow> > {
letters, lettersFallback
});
}
public void GenerateCsv()
{
var columnNameToIndex = new Dictionary <string, int>();
columnNameToIndex["class"] = 0;
for (var i = 1; i <= 1024; i++)
{
columnNameToIndex[$"pixel{i}"] = i;
}
var writer = new CsvWriter(() => new StreamWriter(new FileStream("data.csv", FileMode.Create)));
writer.Write(Directory.GetFiles("assets").Select(fileName => new CsvRow(columnNameToIndex, LoadImageHelper.FileAsData(fileName))));
}