使用IronOCR识别图片文字

最近实验课要做一个图片文字识别，需求是Winform中有一个图片，进行框选后，识别框选中的内容，老师提示说去找OCR的开源库，所以我就找到了IronOCR

IronOCR：The C# OCR Library : Iron OCR

IronOcr makes it easy to read text from images in your .net apps & websites.

1.Read text and barcodes from scanned images & PDFs

2.Supports multiple international languages

3.Output as plain text or structured data

框选

进行识别前，必须框选出识别区域，所以就要先去实现框选，思路就是通过MouseUp、MouseMove、MouseDown三个事件去绘制一个矩形，类似于拖选

    private bool _mouseIsDown = false;
    private Rectangle _selectArea = Rectangle.Empty;

    private void pictureBox_MouseUp(object sender, MouseEventArgs e)
    {
        // 修正Width和Height可能为负数的问题
        if (_selectArea.Width < 0)
        {
            _selectArea.Width = -_selectArea.Width;
            _selectArea.X -= _selectArea.Width;
        }

        if (_
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