Providing an image as pixel array

Aspose.OCR allows you to provide an image for recognition as an array of pixels. This can be useful when working with unsupported file formats or with raw bitmap data.

Pixels are listed from left to right (by line), and each line is added to the array from top to bottom.

Adding color image

The color image is added as a flat byte array representing the amount of each color per pixel. The amount ranges from 0 to 255, where 0 means no that color and 255 is the maximum amount of that color. For example, 2x2 pixels color bitmap is represented as the following byte array in RGB color model:

Because the pixel array does not contain an image header, you must directly specify the image’s width and height, as well as its color model.

Color model	Bytes per pixel	Pixel color order
Aspose.OCR.PixelType.RGB	3	Red Green Blue
Aspose.OCR.PixelType.BGR	3	Blue Green Red
Aspose.OCR.PixelType.RGBA	4	Red Green Blue Opacity

Example

Aspose.OCR.OcrInput source = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
using(Aspose.Imaging.RasterImage image = (RasterImage)Aspose.Imaging.Image.Load("source.png"))
{
	Color[] c = image.LoadPixels(image.Bounds);
	byte[] pixels = new byte[c.Length*3];
	int idx = 0;
	for (int i = 0; i < c.Length*3; i += 3)
	{
		pixels[i] = c[idx].R;
		pixels[i+1] = c[idx].G;
		pixels[i+2] = c[idx].B;
		idx++;
	}
	source.Add(pixels, image.Width, image.Height, Aspose.OCR.PixelType.RGB);
}

Adding grayscale image

The image is provided as a flat byte array, where each byte represents the degree of pixel brightness (one byte per pixel). The number ranges from 0 to 255, where 0 means black and 255 means white.

Because the pixel array does not contain an image header, you must directly specify the image’s width and height, as well as the grayscale (Aspose.OCR.PixelType.BYTE) color model.

Example

Aspose.OCR.OcrInput source = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
using(Aspose.Imaging.RasterImage image = (RasterImage)Aspose.Imaging.Image.Load("source.png"))
{
	Color[] c = image.LoadPixels(image.Bounds);
	byte[] pixels = new byte[c.Length*3];
	for (int i = 0; i < c.Length; i++)
	{
		pixels[i] = (byte)((c[i].R + c[i].G +c[i].B)/3);
	}
	source.Add(pixels, image.Width, image.Height, Aspose.OCR.PixelType.BYTE);
}

Adding image as Aspose.Drawing.Color array

The image can be provided as a flat array of Aspose.Drawing.Color objects.

Because the pixel array does not contain an image header, you must directly specify the image’s width and height.

Example

Aspose.OCR.OcrInput source = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
using(Aspose.Imaging.RasterImage image = (RasterImage)Aspose.Imaging.Image.Load("source.png"))
{
	Color[] c = image.LoadPixels(image.Bounds);
	Aspose.Drawing.Color[] pixels = new Aspose.Drawing.Color[c.Length];
	for (int i = 0; i < c.Length; i++)
	{
		pixels[i] = Aspose.Drawing.Color.FromArgb(c[i].R, c[i].G, c[i].B);
	}
	source.Add(pixels, image.Width, image.Height);
}