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从实例到类别容易，反过来不唯一","sha256":"2d1756706f0e499f6cdbc8191187a87e2505fc9195527b13ea8c9b9b5050fb5e","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-0e85ad6c91301d85e30cf1dc","prerequisites":[{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-0e85ad6c91301d85e30cf1dc","type":"p","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-0e85ad6c91301d85e30cf1dc","content":"同类像素与同一实例是两个概念。实例到类别的映射可多对一，连通块也不可靠地等于对象数。此页提出掩码必须随对象身份分别组织，为区域路线与像素路线的汇合提供具体理由。","sha256":"711e1c9e1612c33ddf45e0a8f3dde8414e5dc22c8e70bd3ae8f1db7fd11f7b86","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-6ff8abf7380bb57bf43f67a0","nextBlock":"b-870e7119e7844be87ffd253c","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-870e7119e7844be87ffd253c","type":"p","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-870e7119e7844be87ffd253c","content":"把像素标为杯子类别，只声明“这里属于杯子集合”。实例标注还声明“这里属于杯一，那里属于杯二”。两只杯子即使同色、接触甚至相互遮挡，实例任务仍需给出两份对象身份。","sha256":"62cd3c3e7472a4976a8c101608c68d04df6eb55e6ed8b1cdfe8b808e43846633","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-0e85ad6c91301d85e30cf1dc","nextBlock":"b-5c404137e6f120973dc98a38","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-5c404137e6f120973dc98a38","type":"p","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-5c404137e6f120973dc98a38","content":"考虑一行标签 `[1,1,2,2]`，其中 1、2 是两只杯子的实例号。将它们都映射到类别杯子=1，就得到 `[1,1,1,1]`。另一个实例划分 `[1,2,2,2]` 经同样映射也得到同一类别行。因此类别图不能唯一反推出实例边界。","sha256":"b77c69f411f0cec66906efa93953096b72fee0517dd04ceb2eb4f2c14fca2c6c","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-870e7119e7844be87ffd253c","nextBlock":"b-74835e889afb797b5cdef2ca","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-74835e889afb797b5cdef2ca","type":"p","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-74835e889afb797b5cdef2ca","content":"连通域可以在“每个对象互不接触”的特定条件下帮忙计数，但一旦两只杯子相接，一个连通块可含两个对象；反过来同一被遮挡的对象还可能产生不连通的可见部分。对象身份不是连通性规则自动保证的属性。","sha256":"df469b42a008cfb7ecd8a88fd7f7836c4bc0779d31028b4938705dc288908ff6","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-5c404137e6f120973dc98a38","nextBlock":"b-02087a79d37c5d0ae362e924","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-02087a79d37c5d0ae362e924","type":"p","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-02087a79d37c5d0ae362e924","content":"区域路线给每个候选一份身份，像素路线给精细轮廓。把它们结合，就可以在“这个候选对象”之内预测局部 mask。这是进入 Mask R-CNN 的具体需求，而不是为了再增加一种模型名称。","sha256":"ea717067584e344418a930c49862e5bea35e54c3e75453a5dc35674aa7112bb5","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-74835e889afb797b5cdef2ca","nextBlock":"b-231b0c2cf2cb9e6c0e633b8d","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]},{"id":"b-231b0c2cf2cb9e6c0e633b8d","type":"figure","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-231b0c2cf2cb9e6c0e633b8d","content":"图内标签与数值：Lecture 03 课堂图解 P39；同一底图，只改变标注问题；语义：两只都属于“杯子”；实例：#1 与 #2 分开；同色编码类别；不同色编码对象 ID；可见轮廓、杯柄孔洞和书遮挡保留；同类像素正确，还不等于交付了实例身份。\n\n相同杯子类别，需要两份实例身份与对应像素集合。 查看对应图解状态\n\n- 同一底图，只改变标注问题\n- 语义：两只都属于“杯子”\n- 实例：#1 与 #2 分开\n- 同色编码类别\n- 不同色编码对象 ID\n- 可见轮廓、杯柄孔洞和书遮挡保留；同类像素正确，还不等于交付了实例身份。相同杯子类别，需要两份实例身份与对应像素集合。 [查看对应图解状态](/#/l3-r2-p39/0)[查看完整图解](/#/l3-r2-p39/0)","sha256":"3d18de8287f05e32be4429b29a4890519bd58e1f9bf0094d9b7c1d5fbd20d729","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"相同杯子类别，需要两份实例身份与对应像素集合。 查看对应图解状态","labels":["同一底图，只改变标注问题","语义：两只都属于“杯子”","实例：#1 与 #2 分开","同色编码类别","不同色编码对象 ID","可见轮廓、杯柄孔洞和书遮挡保留；同类像素正确，还不等于交付了实例身份。"],"description":"相同杯子类别，需要两份实例身份与对应像素集合。 查看对应图解状态同一底图，只改变标注问题语义：两只都属于“杯子”实例：#1 与 #2 分开同色编码类别不同色编码对象 ID可见轮廓、杯柄孔洞和书遮挡保留；同类像素正确，还不等于交付了实例身份。","evidenceIdentity":"相同杯子类别，需要两份实例身份与对应像素集合。 查看对应图解状态","images":[{"src":"/assets/display/8ced939a1fd55047fbf73ea5.webp","alt":""},{"src":"/assets/display/8ced939a1fd55047fbf73ea5.webp","alt":""}]},"previousBlock":"b-02087a79d37c5d0ae362e924","nextBlock":"b-b05a43896204fbc510eb3171","prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-b05a43896204fbc510eb3171","type":"h2","scope":"instance-identity-map","url":"https://codingai-lec03.pages.dev/course/blocks/instance-identity-map.html#b-b05a43896204fbc510eb3171","content":"## 继续阅读与实验","sha256":"2b9ccef7e1220e2250cceff1abd8bdd736b42f8da5a223f26b029f44b962e807","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"instance-mask-identity","title":"怎样让每一份轮廓属于一个明确对象？"},"page":{"id":"reading-opening","title":"从实例到类别容易，反过来不唯一","number":1},"sectionTitle":"从实例到类别容易，反过来不唯一","currentQuestion":"从实例到类别容易，反过来不唯一","sourceSlides":[],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-231b0c2cf2cb9e6c0e633b8d","nextBlock":null,"prerequisites":[{"id":"b-6ff8abf7380bb57bf43f67a0","url":"#b-6ff8abf7380bb57bf43f67a0","role":"section-title"},{"id":"b-0e85ad6c91301d85e30cf1dc","url":"#b-0e85ad6c91301d85e30cf1dc","role":"problem-context"}],"relatedBlocks":[{"id":"b-231b0c2cf2cb9e6c0e633b8d","url":"#b-231b0c2cf2cb9e6c0e633b8d","relation":"figure-and-explanation"}]}]}