Abstract: Aimed at industrial CT images that including multi-object in per slice，study a multi-object detect method based on arc-radius projection.Through arc-radius projection，limit the images’ searching area，namely a part of a sector area.Object Recognition is performed only in the candidates area using Zernike moments.Experiments indivcate the proposed method is of availability and practicality.

摘要： 工业CT检测中，为了提高检测效率，节约成本，对较小的同批、同型号工件进行检测时，通常会将多个工件一起扫描。所识别工件基本上在同一圆环带上，工件在整个图像中的面积比重较小。根据这个特点，提出了一种基于弧半径投影的多目标图像搜索方法，减少识别耗时，最后在目标区域再利用Zernike矩进行精确识别。通过对大量的实际CT图像识别，证明提出方法的有效性和实用性。