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先检查候选有没有覆盖对象","sha256":"ea36b147aebeaf0410a5a6adb64d6104e02ca981c0585907bb94647343c71faf","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":null,"nextBlock":"b-a7d4478e99839b62f3a50661","prerequisites":[{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-a7d4478e99839b62f3a50661","type":"h2","scope":"explanation","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-a7d4478e99839b62f3a50661","content":"## 解释、算例与证据","sha256":"d71cf15e707c8a3674b4c90a599efee783cb84da5b8c8236a1d01c3add7b4958","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-6f97b27f61a58579552e99c4","nextBlock":"b-e6dd74945f01a8d53969f7c7","prerequisites":[{"id":"b-6f97b27f61a58579552e99c4","url":"#b-6f97b27f61a58579552e99c4","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-e6dd74945f01a8d53969f7c7","type":"h1","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-e6dd74945f01a8d53969f7c7","content":"# P28 · 候选区域不是已经识别出的物体","sha256":"7f05a2bf2eeb973fcc899a1f0073f24664874a3f732b12fa801fcb3e1e6958bd","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-a7d4478e99839b62f3a50661","nextBlock":"b-06f8b516920bbaadf3fcffb3","prerequisites":[{"id":"b-a7d4478e99839b62f3a50661","url":"#b-a7d4478e99839b62f3a50661","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-06f8b516920bbaadf3fcffb3","type":"p","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-06f8b516920bbaadf3fcffb3","content":"候选集合应覆盖对象，但其中可以有局部、背景与多对象框。先看漏掉对象是候选完全没有覆盖，还是后级没有选中；两种失败需要不同改动。训练分配与评价匹配的规则留在下方算例，不把 proposal 当已识别对象。","sha256":"8ea77c16f575be2cbf88ff721c1deb12dd3ec3c12f54b75fcd564654270b2751","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-e6dd74945f01a8d53969f7c7","nextBlock":"b-0e8422835a1735533c902f29","prerequisites":[{"id":"b-e6dd74945f01a8d53969f7c7","url":"#b-e6dd74945f01a8d53969f7c7","role":"section-title"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-0e8422835a1735533c902f29","type":"figure","scope":"document","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-0e8422835a1735533c902f29","content":"图内标签与数值：Lecture 03 课堂图解 P28；候选 = 值得进一步检查的区域；完整目标；希望被覆盖；半只杯子 / 背景；仍需筛选；两个对象共同框；仍需拆分与修正\n\n完整杯子、半只杯子、背景和两杯共同框四种候选叠加于同一图片。\n\n- 候选 = 值得进一步检查的区域\n- 完整目标\n- 希望被覆盖\n- 半只杯子 / 背景\n- 仍需筛选\n- 两个对象共同框\n- 仍需拆分与修正完整杯子、半只杯子、背景和两杯共同框四种候选叠加于同一图片。 [查看对应图解状态](/#/l3-r2-p28/0)[查看完整图解](/course/figures/l3-r2-p28-0.html)","sha256":"86d574d18562838391759769f3fc739b51d95c3e3b13bbaf8cd4c38edc0a9812","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"figure":{"caption":"完整杯子、半只杯子、背景和两杯共同框四种候选叠加于同一图片。 查看对应图解状态","labels":["候选 = 值得进一步检查的区域","完整目标","希望被覆盖","半只杯子 / 背景","仍需筛选","两个对象共同框","仍需拆分与修正"],"description":"完整杯子、半只杯子、背景和两杯共同框四种候选叠加于同一图片。候选 = 值得进一步检查的区域完整目标希望被覆盖半只杯子 / 背景仍需筛选两个对象共同框仍需拆分与修正","evidenceIdentity":"完整杯子、半只杯子、背景和两杯共同框四种候选叠加于同一图片。 查看对应图解状态","images":[{"src":"/assets/display/8ced939a1fd55047fbf73ea5.webp","alt":""}]},"previousBlock":"b-06f8b516920bbaadf3fcffb3","nextBlock":"b-f2cfde9b4a9fcd1fbc115259","prerequisites":[{"id":"b-e6dd74945f01a8d53969f7c7","url":"#b-e6dd74945f01a8d53969f7c7","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[]},{"id":"b-f2cfde9b4a9fcd1fbc115259","type":"h2","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-f2cfde9b4a9fcd1fbc115259","content":"## 课堂讲述","sha256":"786ce10a6b32a492259a3dccd0a54e61cd41d28a34382fb7b5386c5f03b7ad69","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-0e8422835a1735533c902f29","nextBlock":"b-8f6bea9fca518aed71dc05e2","prerequisites":[{"id":"b-e6dd74945f01a8d53969f7c7","url":"#b-e6dd74945f01a8d53969f7c7","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-8f6bea9fca518aed71dc05e2","type":"p","scope":"narrative","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-8f6bea9fca518aed71dc05e2","content":"为什么先产生很多候选？因为直接在所有位置和大小上寻找对象，搜索空间很大。候选阶段先尽量把真目标覆盖住，后续再筛选与修正。\n所以 proposal 不是最终物体答案。这个框只含半只杯子，那个框主要是桌面，还有一个框同时包住两个对象；它们都可能进入候选集合。我们希望候选不要漏掉真对象，却不能因为候选很多就说检测很好。\n训练也因此多了新内容：哪些区域算前景，哪些算背景，怎样与人工标注的目标对应。这里先抓住任务分工，不逐条展开所有阈值。下一页看这条朴素路线的计算代价：大量相近的区域，究竟重复算了什么？","sha256":"5731433eb462d317ac48d951a6f70ba7d92a3f07fb7aadefbaba254cbf199b86","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"先检查候选有没有覆盖对象","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":null,"formulas":[],"previousBlock":"b-f2cfde9b4a9fcd1fbc115259","nextBlock":"b-9749896459cdb48977c61b44","prerequisites":[{"id":"b-f2cfde9b4a9fcd1fbc115259","url":"#b-f2cfde9b4a9fcd1fbc115259","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"}]},{"id":"b-9749896459cdb48977c61b44","type":"h3","scope":"proposal-coverage","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-9749896459cdb48977c61b44","content":"### 候选区域先追求覆盖，再由检测头作判断","sha256":"ef150415576f90759c0beab63f476d24de49dd02a5971e583070055b37770700","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"候选区域先追求覆盖，再由检测头作判断","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":"proposal-coverage","formulas":[],"previousBlock":"b-8f6bea9fca518aed71dc05e2","nextBlock":"b-2c5879ec75125f8b0d85341b","prerequisites":[{"id":"b-f2cfde9b4a9fcd1fbc115259","url":"#b-f2cfde9b4a9fcd1fbc115259","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"},{"id":"b-2c5879ec75125f8b0d85341b","url":"#b-2c5879ec75125f8b0d85341b","relation":"same-reasoning"},{"id":"b-ed813f10fca8772bd7f16d5d","url":"#b-ed813f10fca8772bd7f16d5d","relation":"same-reasoning"},{"id":"b-99d2f78b0eef3675c9046e24","url":"#b-99d2f78b0eef3675c9046e24","relation":"same-reasoning"},{"id":"b-949affda6622b5aec6d7608d","url":"#b-949affda6622b5aec6d7608d","relation":"same-reasoning"}]},{"id":"b-2c5879ec75125f8b0d85341b","type":"p","scope":"proposal-coverage","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-2c5879ec75125f8b0d85341b","content":"proposal 的含义是“值得进一步检查的区域”。它可以覆盖完整杯子，也可以只有半只杯子、包含桌面，或把两只杯子一起框住。候选阶段尚未交付最终的类别、数量与精确边界。","sha256":"b55eb8eebd98e289b96d27f919e1aec62217749a4d5191d494b68c51795f1e3b","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"候选区域先追求覆盖，再由检测头作判断","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":"proposal-coverage","formulas":[],"previousBlock":"b-9749896459cdb48977c61b44","nextBlock":"b-ed813f10fca8772bd7f16d5d","prerequisites":[{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"},{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","relation":"same-reasoning"},{"id":"b-ed813f10fca8772bd7f16d5d","url":"#b-ed813f10fca8772bd7f16d5d","relation":"same-reasoning"},{"id":"b-99d2f78b0eef3675c9046e24","url":"#b-99d2f78b0eef3675c9046e24","relation":"same-reasoning"},{"id":"b-949affda6622b5aec6d7608d","url":"#b-949affda6622b5aec6d7608d","relation":"same-reasoning"}]},{"id":"b-ed813f10fca8772bd7f16d5d","type":"p","scope":"proposal-coverage","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-ed813f10fca8772bd7f16d5d","content":"设某张图有两只杯子。若候选集合里完全没有接近右杯的框，后面的区域分类再强，也很难在当前流程中找回它。因此可以先看 proposal recall：在某个 IoU 门槛下，有多少真值对象至少被一个候选覆盖。候选很多可能提高这个召回，却增加计算与重复；后续分类和框回归再筛去背景、校正近似位置。","sha256":"0a3df1349ae7101429d31f6c8c39cd584276870bab9c4dc369e8ad94087c794b","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"候选区域先追求覆盖，再由检测头作判断","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":"proposal-coverage","formulas":[],"previousBlock":"b-2c5879ec75125f8b0d85341b","nextBlock":"b-99d2f78b0eef3675c9046e24","prerequisites":[{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"},{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","relation":"same-reasoning"},{"id":"b-2c5879ec75125f8b0d85341b","url":"#b-2c5879ec75125f8b0d85341b","relation":"same-reasoning"},{"id":"b-99d2f78b0eef3675c9046e24","url":"#b-99d2f78b0eef3675c9046e24","relation":"same-reasoning"},{"id":"b-949affda6622b5aec6d7608d","url":"#b-949affda6622b5aec6d7608d","relation":"same-reasoning"}]},{"id":"b-99d2f78b0eef3675c9046e24","type":"p","scope":"proposal-coverage","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-99d2f78b0eef3675c9046e24","content":"训练时，“这是不是前景”和“它应该往哪移动”也分开。一个背景区域有分类目标，却没有应当回归到某只杯子的唯一位置目标。具体的正负阈值、强制匹配和忽略区间随方法而异；不要把课堂上一组示例阈值视为所有检测器的定义。","sha256":"301693b7d1874296ba2d63739c81e9c0a115b0edcd530b68155a04e8499cc32a","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"候选区域先追求覆盖，再由检测头作判断","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":"proposal-coverage","formulas":[],"previousBlock":"b-ed813f10fca8772bd7f16d5d","nextBlock":"b-949affda6622b5aec6d7608d","prerequisites":[{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"},{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","relation":"same-reasoning"},{"id":"b-2c5879ec75125f8b0d85341b","url":"#b-2c5879ec75125f8b0d85341b","relation":"same-reasoning"},{"id":"b-ed813f10fca8772bd7f16d5d","url":"#b-ed813f10fca8772bd7f16d5d","relation":"same-reasoning"},{"id":"b-949affda6622b5aec6d7608d","url":"#b-949affda6622b5aec6d7608d","relation":"same-reasoning"}]},{"id":"b-949affda6622b5aec6d7608d","type":"p","scope":"proposal-coverage","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-949affda6622b5aec6d7608d","content":"可以先在图上指出一只完全漏掉的杯子，再问该改候选覆盖还是区域分类。这个定位比笼统地说“网络不够强”更能指导实验。","sha256":"7cccefd2f1423965cf908491c70f412986a5ffd5e7e2bdce8a72648938971d84","chapter":{"id":"II","title":"区域、像素与实例"},"unit":{"id":"region-computation-reuse","title":"多个区域怎样复用同一份视觉计算？"},"page":{"id":"region-proposal-coverage","title":"先检查候选有没有覆盖对象","number":1},"sectionTitle":"候选区域先追求覆盖，再由检测头作判断","currentQuestion":"从逐区域编码到共享整图特征，哪些计算被保留，哪些接口必须重建？","sourceSlides":["l3-r2-p28"],"knowledgeBlock":"proposal-coverage","formulas":[],"previousBlock":"b-99d2f78b0eef3675c9046e24","nextBlock":"b-20d7238e8d919cca95d78ff9","prerequisites":[{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","role":"section-title"},{"id":"b-06f8b516920bbaadf3fcffb3","url":"#b-06f8b516920bbaadf3fcffb3","role":"problem-context"}],"relatedBlocks":[{"id":"b-0e8422835a1735533c902f29","url":"#b-0e8422835a1735533c902f29","relation":"figure-and-explanation"},{"id":"b-9749896459cdb48977c61b44","url":"#b-9749896459cdb48977c61b44","relation":"same-reasoning"},{"id":"b-2c5879ec75125f8b0d85341b","url":"#b-2c5879ec75125f8b0d85341b","relation":"same-reasoning"},{"id":"b-ed813f10fca8772bd7f16d5d","url":"#b-ed813f10fca8772bd7f16d5d","relation":"same-reasoning"},{"id":"b-99d2f78b0eef3675c9046e24","url":"#b-99d2f78b0eef3675c9046e24","relation":"same-reasoning"}]},{"id":"b-20d7238e8d919cca95d78ff9","type":"h2","scope":"practice","url":"https://codingai-lec03.pages.dev/course/pages/l3-r2-p28.html#b-20d7238e8d919cca95d78ff9","content":"## 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