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On the basis of the existing detection network structure, a new decoupling prediction branch is added to realize the multi-task recognition of pedestrian position, head position, pedestrian age and occlusion attributes under the vehicle-mounted camera in this paper. The influence of classification branch on detection performance at different network locations is demonstrated by experiments. Aiming at the problem that some nonlinear activation function operators in engineering applications are not supported by the deployment environment, a method using piecewise linear function to fit the nonlinear activation function is proposed, which not only improves the performance of network identification but also provides convenience for engineering deployment.
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通过在已有检测网络结构的基础上增加解耦预测支路,实现了车载摄像头下行人位置、人头位置、行人年龄与遮挡属性识别任务,经过试验论证了分类支路在不同网络位置对检测性能的影响。针对网络部署中一些非线性激活函数算子不受工程环境支持这一问题,提出了一种使用分段线性函数来拟合非线性激活函数的方法。经过验证表明,该方法既提升了网络识别的性能又为工程部署提供了便捷性。
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朱亚旋(1994—),男,一汽(南京)科技开发有限公司,硕士研究生,研究方向为车载视觉障碍物、交通元素感知算法。E-mail:zhuyaxuan@faw.com.cn;
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尹荣彬(1989—),男,一汽(南京)科技开发有限公司,学士,研究方向为车载智能化高低阶辅助驾驶技术合成。E-mail:yinrongbin@faw.com.cn;
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尹荣彬(1989—),男,一汽(南京)科技开发有限公司,学士,研究方向为车载智能化高低阶辅助驾驶技术合成。E-mail:yinrongbin@faw.com.cn;
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吴继超(1992—),男,一汽(南京)科技开发有限公司,硕士研究生,研究方向为基于车载信号的地图定位算法。E-mail:wujichao1@faw.com.cn
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Mish激活函数分布, figureFileSmall=XFW44CoxmZGtvLDt5jtaLg==, figureFileBig=YsWJfyP3A9/DnvddQ/a3rQ==, tableContent=null), ArticleFig(id=1200502761713422462, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=8ZiL6Sa4gsQXf8DiagjvCQ==, figureFileBig=jy/W93DeyOMey2xlM9HZpA==, tableContent=null), ArticleFig(id=1200502761784725631, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=CN, label=图6, caption=
不同分段点处对应的激活点值, figureFileSmall=8ZiL6Sa4gsQXf8DiagjvCQ==, figureFileBig=jy/W93DeyOMey2xlM9HZpA==, tableContent=null), ArticleFig(id=1200502761856028800, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=oJwMDUetMIWFIbDAK69osQ==, figureFileBig=4YtM+p+oMYoj103ZzK97PQ==, tableContent=null), ArticleFig(id=1200502761931526273, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=CN, label=图7, caption=
分段拟合效果与原有激活函数在(-16,0)范围内的映射分布对比, figureFileSmall=oJwMDUetMIWFIbDAK69osQ==, figureFileBig=4YtM+p+oMYoj103ZzK97PQ==, tableContent=null), ArticleFig(id=1200502762007023746, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=amxrTzE8Dl5ljHXbwb0J8w==, figureFileBig=RhlQ5bMwYpp+wiN0ZH74nA==, tableContent=null), ArticleFig(id=1200502762095104131, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=CN, label=图8, caption=
部分测试图片识别效果示例, figureFileSmall=amxrTzE8Dl5ljHXbwb0J8w==, figureFileBig=RhlQ5bMwYpp+wiN0ZH74nA==, tableContent=null), ArticleFig(id=1200502762195767428, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 行人 框(ap)
| 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标 年龄 (acc) |
| 使用解耦支路特征图 | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
| 使用检测支路特征图 | 76.80 | 50.10 | 80.10 | 61.70 | 98.18 | 89.20 |
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预测支路在不同位置的效果 %
, figureFileSmall=null, figureFileBig=null, tableContent=
| 行人 框(ap)
| 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标 年龄 (acc) |
| 使用解耦支路特征图 | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
| 使用检测支路特征图 | 76.80 | 50.10 | 80.10 | 61.70 | 98.18 | 89.20 |
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| 行人框(ap) | 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标年龄 (acc) |
| k=0.01 | 78.00 | 54.67 | 82.30 | 57.40 | 98.20 | 91.10 |
| k=0.10 | 79.20 | 58.20 | 86.80 | 70.20 | 97.50 | 92.30 |
| k=0.50 | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
), ArticleFig(id=1200502762468397191, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=CN, label=表2, caption=
分类支路损失在不同权重下的影响 %
, figureFileSmall=null, figureFileBig=null, tableContent=
| 行人框(ap) | 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标年龄 (acc) |
| k=0.01 | 78.00 | 54.67 | 82.30 | 57.40 | 98.20 | 91.10 |
| k=0.10 | 79.20 | 58.20 | 86.80 | 70.20 | 97.50 | 92.30 |
| k=0.50 | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
), ArticleFig(id=1200502762623586440, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 行人框(ap) | 人头框 (ap) | 非机动车框(ap) |
| 原损失函数 | 81.60 | 57.20 | 88.00 |
| giou loss | 79.00 | 54.80 | 86.00 |
| ciou loss | 78.00 | 54.67 | 82.30 |
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不同iou损失对检测框性能的影响 %
, figureFileSmall=null, figureFileBig=null, tableContent=
| 行人框(ap) | 人头框 (ap) | 非机动车框(ap) |
| 原损失函数 | 81.60 | 57.20 | 88.00 |
| giou loss | 79.00 | 54.80 | 86.00 |
| ciou loss | 78.00 | 54.67 | 82.30 |
), ArticleFig(id=1200502762753609866, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 行 人 框 (ap) | 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标年龄 (acc) |
Swish $(\beta =1)$ | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
线性拟合 方案 (本文方法) | 81.20 | 58.34 | 88.12 | 71.88 | 98.18 | 92.98 |
), ArticleFig(id=1200502762816524427, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1200101506398650716, language=CN, label=表4, caption=
激活函数拟合方法对模型性能的影响 %
, figureFileSmall=null, figureFileBig=null, tableContent=
| 行 人 框 (ap) | 人头框 (ap) | 非机动车框 (ap) | 总体遮挡程度 (acc) | 人头是否遮挡 (acc) | 目标年龄 (acc) |
Swish $(\beta =1)$ | 81.60 | 57.20 | 88.00 | 71.58 | 98.30 | 92.95 |
线性拟合 方案 (本文方法) | 81.20 | 58.34 | 88.12 | 71.88 | 98.18 | 92.98 |
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