Error: Insufficient memory, image to text. (C#)

Question

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Hello, i want to make an image to a text. And i want to find the text from the image (oCr). But it gives an error. "insufficient memory"

My code:

C#

private Image DetectNumbers2(Image img, Color c)
    {
        try
        {
            Bitmap bimg = new Bitmap(img);
            for (int x = 0; x < bimg.Width - 1; x++)
            {
                for (int y = 0; y < bimg.Height - 1; y++)
                {
                    Color c2 = bimg.GetPixel(x, y);
                    if (c2.R >= 240 && c2.R <= 255 && c2.G >= 45 && c2.G <= 60 && c2.B >= 45 && c2.B <= 60)
                    {
                        var img2 = bimg.Clone(new Rectangle(x, y, bimg.Height-y-1, bimg.Width-x-1), pictureBox3.Image.PixelFormat);
                        return img;
                    }
                }
            }
            return null;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
            return null;
        }
    }

My button:

C#

if (DetectNumbers2(pictureBox6.Image, GetReadColor(int.Parse(label1.Text))) != null) pictureBox11.Image = DetectNumbers2(pictureBox6.Image, GetReadColor(int.Parse(label1.Text)));

Posted 8-Oct-13 6:56am

Member 10323594

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Comments

Sergey Alexandrovich Kryukov 8-Oct-13 13:08pm

In what line? And I see no trace of using any OCR. Where is it, what is it?
—SA

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Ron Beyer · Accepted Answer · 2013-10-08T08:22:00

I see two problems, first:

C#

if (DetectNumbers2(pictureBox6.Image, GetReadColor(int.Parse(label1.Text))) != null) pictureBox11.Image = DetectNumbers2(pictureBox6.Image, GetReadColor(int.Parse(label1.Text)));

OCR is expensive, and what you are doing (using GetPixel) is VERY VERY expensive, even if you are just returning a piece of an image. So why are you doing the exact same thing twice? You can assign Null to an image, just do this:

C#

pictureBox11.Image = DetectNumbers2(pictureBox6.Image, GetReadColor(int.Parse(label1.Text)));

And leave out the If statement. If you need to tell the user, you can check AFTER, like

C#

if (pictureBox11.Image == null)
  //Tell the user that it failed....

Next is this line, which may be where your problem is coming from:

C#

var img2 = bimg.Clone(new Rectangle(x, y, bimg.Height-y-1, bimg.Width-x-1), pictureBox3.Image.PixelFormat);

Rectangles are defined as : (x, y, Width, Height). You are trying to define it as (x, y, Height, Width), which is wrong.

If you look at the documentation for System.Drawing.Bitmap.Clone()[^] You can see it gives an OutOfMemoryException if the width/height of the rectangle is outside of the bounds of the original bitmap.