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          1. python报错The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

            情深不及哈士奇 发布于 03/27 17:43
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            投影法做字符切割的一段程序,像素比较的时候会报错是为什么
            def projection_line(array_vals, minimun_val, minimun_range):
                start_i = None
                end_i = None
                line_ranges = []
                '''
                for index, item in enumerate(list1):
                print index, item  
                '''
                for i, val in enumerate(array_vals):
                    # 黑色像素起点
                    if val > minimun_val and start_i is None:
                        start_i = i
                    # 黑色像素区间
                    elif val > minimun_val and start_i is not None:
                        pass
                    # 黑色像素终点
                    elif val < minimun_val and start_i is not None:
                        # 黑色像素的长度
                        if i - start_i >= minimun_range:
                            end_i = i
                            #print(end_i - start_i)
                            # 记录此段黑色像素起始点
                            line_ranges.append((start_i, end_i))
                            start_i = None
                            end_i = None
                    # 白色像素区域
                    elif val < minimun_val and start_i is None:
                        pass
                    else:
                        raise ValueError("cannot parse this case...")
                return line_ranges

            报错信息:if val > minimun_val and start_i is None:
            ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

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