{"id":7357,"date":"2025-01-25T00:08:12","date_gmt":"2025-01-24T16:08:12","guid":{"rendered":"http:\/\/www.yptk.cn\/?p=7357"},"modified":"2025-01-25T00:08:13","modified_gmt":"2025-01-24T16:08:13","slug":"nyquist%e9%a2%91%e7%8e%87","status":"publish","type":"post","link":"http:\/\/yptk.cn\/index.php\/2025\/01\/25\/nyquist%e9%a2%91%e7%8e%87\/","title":{"rendered":"Nyquist\u9891\u7387"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u91c7\u6837<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u5b57\u91c7\u6837\u2014\u2014\u5c06\u8fde\u7eed\u6a21\u62df\u4fe1\u53f7\u8f6c\u6362\u4e3a\u79bb\u6563\u6570\u5b57\u4fe1\u53f7\u7684\u64cd\u4f5c\u5305\u542b\u4ee5\u4e0b\u4e24\u4e2a\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u91c7\u6837\u2014\u2014\u4ee5\u6307\u5b9a\u9891\u7387\u91c7\u53d6\u8fde\u7eed\u4fe1\u53f7\u7684\u503c\u3002<\/li>\n\n\n\n<li>\u91cf\u5316\u2014\u2014\u5c06\u8fde\u7eed\u6a21\u62df\u6837\u672c\u503c\u6620\u5c04\u6210\u79bb\u6563\u6570\u5b57\u6837\u672c\u503c\u3002\u4f8b\u5982\u5c06\u8fde\u7eed\u7535\u538b 0-1 V\u6620\u5c04\u4e3a\u79bb\u6563\u50cf\u7d20\u503c 0-255\uff08\u5bf9\u4e8e 8-bit\u7cfb\u7edf\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"http:\/\/www.yptk.cn\/wp-content\/uploads\/2022\/10\/\u56fe\u7247-17.png\" alt=\"\" class=\"wp-image-7358\"\/><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">Nyquist\u9891\u7387\uff1a<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u6570\u5b57\u4f20\u611f\u5668\u53ef\u4ee5\u6355\u6349\u7684\u771f\u5b9e\u4fe1\u606f\u4e2d\u7684\u6700\u5927\u7a7a\u95f4\u9891\u7387\uff0c\u88ab\u5b9a\u4e49\u4e3aNyquist\u9891\u7387(\u5948\u594e\u65af\u7279\u9891\u7387)\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nyquist frequency&nbsp;<em>fN<\/em>&nbsp;= 1\/(2 * pixel spacing) = 0.5 cycles\/pixel\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4efb\u4f55\u5927\u4e8eNyquist\u9891\u7387\u7684\u4fe1\u606f\u5728\u8fbe\u5230\u4f20\u611f\u5668\u4e0a\u65f6\u4f1a\u6df7\u6dc6\u5230\u8f83\u4f4e\u9891\u7684\u4fe1\u606f\u4e2d\uff0c\u6709\u53ef\u80fd\u4ea7\u751f\u6469\u5c14\u7eb9\u3002\u6df7\u6dc6\u73b0\u8c61\u5bf9\u4e8eBayer\u578b\u7684\u4f20\u611f\u5668\u662f\u5f88\u5178\u578b\u7684\uff0c\u53ef\u80fd\u4ea7\u751f\u5f69\u8272\u6761\u7eb9\u3002\u7406\u60f3\u7684\u6ca1\u6709\u8870\u51cf\u7684\u955c\u5934\/\u4f20\u611f\u5668\u7cfb\u7edf\u7684MTF=1\uff0c\u5b9e\u9645\u7684\u5149\u5b66\u7cfb\u7edf\u662f\u8fbe\u4e0d\u5230\u7684\u3002\u6297\u6df7\u6dc6(Anti-aliasing)\u6ee4\u955c\u7684\u8bbe\u8ba1\uff0c\u53ef\u4ee5\u6539\u5584\u6df7\u6dc6\u73b0\u8c61\uff0c\u4f46\u662f\u9700\u8981\u6743\u8861\u6e05\u6670\u5ea6\u7684\u964d\u4f4e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u90fd\u662f\u6284\u6765\u7684\uff0c\u4e0b\u9762\u8bf4\u8bf4\u6211\u7684\u7406\u89e3\u3002Nyquist\u662f\u60f3\u8bf4\uff0c\u81f3\u5c11\u534a\u4e2a\u5468\u671f\u91c7\u6837\u4e00\u6b21\uff0c\u624d\u80fd\u4fdd\u8bc1\u4fe1\u53f7\u4e0d\u5931\u771f\u3002\uff08\u539f\u59cb\u6a21\u62df\u4fe1\u53f7\u53ef\u4ee5\u88ab\u7cbe\u786e\u5730\u91cd\u5efa\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u91c7\u6837 \u6570\u5b57\u91c7\u6837\u2014\u2014\u5c06\u8fde\u7eed\u6a21\u62df\u4fe1\u53f7\u8f6c\u6362\u4e3a\u79bb\u6563\u6570\u5b57\u4fe1\u53f7\u7684\u64cd\u4f5c\u5305\u542b\u4ee5\u4e0b\u4e24\u4e2a\u6b65\u9aa4\uff1a Nyquist\u9891\u7387\uff1a \u4e00\u4e2a\u6570\u5b57\u4f20\u611f\u5668\u53ef\u4ee5\u6355\u6349\u7684\u771f\u5b9e\u4fe1\u606f\u4e2d\u7684\u6700\u5927\u7a7a\u95f4\u9891\u7387\uff0c\u88ab\u5b9a\u4e49\u4e3aNyquist\u9891\u7387(\u5948\u594e\u65af\u7279\u9891\u7387)\u3002 Nyquist frequency&nbsp;fN&nbsp;= 1\/(2 * pixel spacing) = 0.5 cycles\/pixel\u3002 \u4efb\u4f55\u5927\u4e8eNyquist\u9891\u7387\u7684\u4fe1\u606f\u5728\u8fbe\u5230\u4f20\u611f\u5668\u4e0a\u65f6\u4f1a\u6df7\u6dc6\u5230 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-7357","post","type-post","status-publish","format-standard","hentry","category-camera"],"_links":{"self":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts\/7357","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/comments?post=7357"}],"version-history":[{"count":0,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts\/7357\/revisions"}],"wp:attachment":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/media?parent=7357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/categories?post=7357"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/tags?post=7357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}