void DetectEdge() { if (this.pictureBox_clip.Image == null) { return; } double angle = 0; Rectangle rect; using (Bitmap bitmap = new Bitmap(this.pictureBox_clip.Image)) { // this.pictureBox1.Image = ImageUtil.AforgeAutoCrop(bitmap); DetectBorderParam param = new DetectBorderParam(bitmap); bool bRet = AForgeImageUtil.GetSkewParam(bitmap, param, out angle, out rect); if (bRet == false) { MessageBox.Show(this, "fail"); return; } } #if NO using (Bitmap bitmap = new Bitmap(this.pictureBox1.Image)) { this.pictureBox1.Image = ImageUtil.Apply(bitmap, angle, rect); } #endif List <Point> points = this.pictureBox_clip.ToPoints((float)angle, rect); this.pictureBox_clip.SetPoints(points); }