In this paper, we propose a depth image generation method by stereo matching on super-pixel (SP) basis. In the proposed method, block matching is performed only at the center of the SP, and the obtained disparity is a...In this paper, we propose a depth image generation method by stereo matching on super-pixel (SP) basis. In the proposed method, block matching is performed only at the center of the SP, and the obtained disparity is applied to all pixels of the SP. Next, in order to improve the disparity, a new SP-based cost filter is introduced. This filter multiplies the matching cost of the surrounding SP by a weight based on reliability and similarity and sums the weighted costs of neighbors. In addition, we propose two new error checking methods. One-way check uses only a unidirectional disparity estimation with a small amount of calculation to detect errors. Cross recovery uses cross checking and error recovery to repair lacks of objects that are problematic with SP-based matching. As a result of the experiment, the execution time of the proposed method using the one-way check was about 1/100 of the full search, and the accuracy was almost equivalent. The accuracy using cross recovery exceeded the full search, and the execution time was about 1/60. Speeding up while maintaining accuracy increases the application range of depth images.展开更多
岩石薄片图像的分析往往依赖于专业人员在显微镜下观察并给出鉴定结果,不但费时费力,并且受设备影响较大。近些年,针对薄片图像的自动识别方法已经被提出。然而,这些方法大多采用监督学习与深度学习相结合的方式,由于需要大量人工标注...岩石薄片图像的分析往往依赖于专业人员在显微镜下观察并给出鉴定结果,不但费时费力,并且受设备影响较大。近些年,针对薄片图像的自动识别方法已经被提出。然而,这些方法大多采用监督学习与深度学习相结合的方式,由于需要大量人工标注而受到限制,为方法的推广与应用带来巨大困难。此外,模型在不同的地层、岩性等目标应用时,由于不同地质环境中岩石的差异性,其泛化性也受到极大限制。本文针对该问题提出了一种简单线性迭代聚类算法(simple linear iterative cluster,SLIC)与半监督自训练结合的方法,仅依靠6%的人工标注便能够实现岩石图像的自动化分割与组分识别,极大地增强岩石图像自动识别方法在实际应用中的价值。该方法首先使用超像素算法SLIC对岩石图像进行预分割,随后基于分割片的颜色特征进行粗合并,并根据最小外接矩形进行切割;切割下来的岩石组分分割图像作为后续处理的基础数据集,这里仅需要人工标注6%的岩石组分数据;随后,这些数据通过一个改进的半监督自训练方法,以改进的VGG16模型作为主模型、ResNet18模型作为评判模型,不断生成高置信度的伪标签,利用迭代优化调整,将其扩展到整个数据集,最终获得一个具有较高的稳定性、准确性及一致性的组分识别模型。实际数据的测试与分析表明,本文所提出SLIC和半监督自训练结合的方法,对6类岩石组分的识别准确率可达到96%。该方法能够在数据差异不大的条件下,帮助用户基本实现自动化的组分识别。而当数据集产生较大差异时,仅需标注小部分样品即可实现自动组分识别。本方法具有较高的泛化性和可靠性,能够在实际应用提供足够的准确性与便利性。展开更多
文摘In this paper, we propose a depth image generation method by stereo matching on super-pixel (SP) basis. In the proposed method, block matching is performed only at the center of the SP, and the obtained disparity is applied to all pixels of the SP. Next, in order to improve the disparity, a new SP-based cost filter is introduced. This filter multiplies the matching cost of the surrounding SP by a weight based on reliability and similarity and sums the weighted costs of neighbors. In addition, we propose two new error checking methods. One-way check uses only a unidirectional disparity estimation with a small amount of calculation to detect errors. Cross recovery uses cross checking and error recovery to repair lacks of objects that are problematic with SP-based matching. As a result of the experiment, the execution time of the proposed method using the one-way check was about 1/100 of the full search, and the accuracy was almost equivalent. The accuracy using cross recovery exceeded the full search, and the execution time was about 1/60. Speeding up while maintaining accuracy increases the application range of depth images.
文摘岩石薄片图像的分析往往依赖于专业人员在显微镜下观察并给出鉴定结果,不但费时费力,并且受设备影响较大。近些年,针对薄片图像的自动识别方法已经被提出。然而,这些方法大多采用监督学习与深度学习相结合的方式,由于需要大量人工标注而受到限制,为方法的推广与应用带来巨大困难。此外,模型在不同的地层、岩性等目标应用时,由于不同地质环境中岩石的差异性,其泛化性也受到极大限制。本文针对该问题提出了一种简单线性迭代聚类算法(simple linear iterative cluster,SLIC)与半监督自训练结合的方法,仅依靠6%的人工标注便能够实现岩石图像的自动化分割与组分识别,极大地增强岩石图像自动识别方法在实际应用中的价值。该方法首先使用超像素算法SLIC对岩石图像进行预分割,随后基于分割片的颜色特征进行粗合并,并根据最小外接矩形进行切割;切割下来的岩石组分分割图像作为后续处理的基础数据集,这里仅需要人工标注6%的岩石组分数据;随后,这些数据通过一个改进的半监督自训练方法,以改进的VGG16模型作为主模型、ResNet18模型作为评判模型,不断生成高置信度的伪标签,利用迭代优化调整,将其扩展到整个数据集,最终获得一个具有较高的稳定性、准确性及一致性的组分识别模型。实际数据的测试与分析表明,本文所提出SLIC和半监督自训练结合的方法,对6类岩石组分的识别准确率可达到96%。该方法能够在数据差异不大的条件下,帮助用户基本实现自动化的组分识别。而当数据集产生较大差异时,仅需标注小部分样品即可实现自动组分识别。本方法具有较高的泛化性和可靠性,能够在实际应用提供足够的准确性与便利性。
