{"id":3890,"date":"2024-11-10T10:04:28","date_gmt":"2024-11-10T02:04:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3890\/"},"modified":"2024-11-10T10:04:28","modified_gmt":"2024-11-10T02:04:28","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-canvas-%e5%ae%9e%e7%8e%b0%e5%9b%be%e7%89%87%e7%9a%84%e5%8a%a8%e6%80%81%e6%a8%a1%e7%b3%8a%e6%95%88%e6%9e%9c%ef%bc%8c%e7%b1%bb%e4%bc%bc%e4%ba%8e%e6%9b%9d%e5%85%89","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3890\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u6548\u679c\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528<\/p>\n

Canvas \u5b9e\u73b0\u56fe\u7247\u52a8\u6001\u6a21\u7cca\u6548\u679c<\/strong><\/p>\n

\u95ee\u9898\uff1a\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u6548\u679c\uff1f<\/p>\n

\u56de\u7b54\uff1a<\/p>\n

\u89e3\u51b3\u56fe\u7247\u52a8\u6001\u6a21\u7cca\u6548\u679c\u7684\u5e38\u89c1\u6280\u672f\u662f\u5b9e\u65bd\u9ad8\u65af\u6a21\u7cca\u8fc7\u6ee4\u5668\u3002\u9ad8\u65af\u6a21\u7cca\u662f\u4e00\u79cd\u56fe\u50cf\u5904\u7406\u6280\u672f\uff0c\u5b83\u901a\u8fc7\u4f7f\u7528\u9ad8\u65af\u5185\u6838\u5bf9\u56fe\u50cf\u4e2d\u7684\u6bcf\u4e2a\u50cf\u7d20\u8fdb\u884c\u52a0\u6743\u5e73\u5747\uff0c\u4ece\u800c\u521b\u5efa\u5e73\u6ed1\u548c\u6a21\u7cca\u7684\u6548\u679c\u3002<\/p>\n

\u5728 Canvas \u4e2d\u5b9e\u73b0\u9ad8\u65af\u6a21\u7cca\u9700\u8981\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n

    \n
  1. \n

    \u521b\u5efa\u753b\u5e03\u548c\u52a0\u8f7d\u56fe\u50cf\uff1a<\/strong><\/p>\n

      \n
    • \u521b\u5efa\u4e00\u4e2a Canvas \u5143\u7d20\u5e76\u83b7\u53d6\u5176\u4e0a\u4e0b\u6587\u3002<\/li>\n
    • \u4ece\u78c1\u76d8\u52a0\u8f7d\u8981\u6a21\u7cca\u7684\u56fe\u50cf\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n

      \u83b7\u53d6\u56fe\u50cf\u6570\u636e\uff1a<\/strong><\/p>\n

        \n
      • \u4f7f\u7528 getImageData() \u65b9\u6cd5\u4ece\u539f\u59cb\u56fe\u50cf\u4e2d\u83b7\u53d6\u56fe\u50cf\u6570\u636e\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u50cf\u7d20\u6570\u636e\u7684 Uint8ClampedArray\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n

        \u5e94\u7528\u9ad8\u65af\u6a21\u7cca\uff1a<\/strong><\/p>\n

          \n
        • \u521b\u5efa\u4e00\u4e2a\u4e00\u7ef4\u9ad8\u65af\u5185\u6838\u3002\u8fd9\u901a\u5e38\u662f\u5927\u5c0f\u4e3a\u5947\u6570\u7684\u6570\u7ec4\uff08\u4f8b\u5982 3×3\u30015×5 \u6216 7×7\uff09\uff0c\u5176\u4e2d\u5143\u7d20\u5bf9\u5e94\u4e8e\u9ad8\u65af\u5206\u5e03\u7684\u949f\u5f62\u66f2\u7ebf\u3002<\/li>\n
        • \n

          \u904d\u5386\u56fe\u50cf\u50cf\u7d20\u6570\u636e\uff0c\u5e76\u9488\u5bf9\u6bcf\u4e2a\u50cf\u7d20\u5e94\u7528\u9ad8\u65af\u6a21\u7cca\u516c\u5f0f\uff1a<\/p>\n

            \n
          • newPixelValue = (kernel[0] * prevPixel) + (kernel[1] * currentPixel) + … + (kernel[n] * nextPixel)<\/li>\n
          • \u5728\u8fd9\u4e2a\u516c\u5f0f\u4e2d\uff0ckernel \u662f\u9ad8\u65af\u5185\u6838\uff0cprevPixel \u662f\u5f53\u524d\u50cf\u7d20\u524d\u9762\u7684\u50cf\u7d20\uff0ccurrentPixel \u662f\u5f53\u524d\u50cf\u7d20\uff0cnextPixel \u662f\u5f53\u524d\u50cf\u7d20\u540e\u9762\u7684\u50cf\u7d20\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
          • \n

            \u66f4\u65b0\u56fe\u50cf\u6570\u636e\uff1a<\/strong><\/p>\n

              \n
            • \u4e00\u65e6\u5bf9\u6240\u6709\u50cf\u7d20\u5e94\u7528\u4e86\u6a21\u7cca\u516c\u5f0f\uff0c\u5c06\u66f4\u65b0\u56fe\u50cf\u6570\u636e ImageData \u5bf9\u8c61\u4e2d\u7684\u76f8\u5e94\u50cf\u7d20\u503c\u3002<\/li>\n<\/ul>\n<\/li>\n
            • \n

              \u5c06\u6a21\u7cca\u56fe\u50cf\u7ed8\u5236\u5230\u753b\u5e03\u4e0a\uff1a<\/strong><\/p>\n

                \n
              • \u4f7f\u7528 putImageData() \u65b9\u6cd5\u5c06\u66f4\u65b0\u7684\u56fe\u50cf\u6570\u636e\u7ed8\u5236\u5230\u753b\u5e03\u4e0a\u3002\u8fd9\u5c06\u663e\u793a\u6a21\u7cca\u6548\u679c\u7684\u56fe\u50cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9ad8\u65af\u6a21\u7cca\u7684\u8d28\u91cf\u5c06\u53d6\u51b3\u4e8e\u6240\u7528\u9ad8\u65af\u5185\u6838\u7684\u5927\u5c0f\u548c\u5f62\u72b6\u3002\u8f83\u5927\u7684\u5185\u6838\u5c06\u4ea7\u751f\u66f4\u5e73\u6ed1\u7684\u6a21\u7cca\uff0c\u800c\u8f83\u5c0f\u7684\u5185\u6838\u5c06\u4ea7\u751f\u66f4\u7cbe\u7ec6\u7684\u6a21\u7cca\u3002<\/p>\n

                \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u6548\u679c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

                Canvas \u5b9e\u73b0\u56fe\u7247\u52a8\u6001\u6a21\u7cca\u6548\u679c \u95ee\u9898\uff1a\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u6548\u679c\uff1f \u56de\u7b54\uff1a \u89e3\u51b3\u56fe\u7247\u52a8\u6001\u6a21\u7cca\u6548\u679c\u7684\u5e38\u89c1\u6280\u672f\u662f\u5b9e\u65bd\u9ad8\u65af\u6a21\u7cca\u8fc7\u6ee4\u5668\u3002\u9ad8\u65af\u6a21\u7cca\u662f\u4e00\u79cd\u56fe\u50cf\u5904\u7406\u6280\u672f\uff0c\u5b83\u901a\u8fc7\u4f7f\u7528\u9ad8\u65af\u5185\u6838\u5bf9\u56fe\u50cf\u4e2d\u7684\u6bcf\u4e2a\u50cf\u7d20\u8fdb\u884c\u52a0\u6743\u5e73\u5747\uff0c\u4ece\u800c\u521b\u5efa\u5e73\u6ed1\u548c\u6a21\u7cca\u7684\u6548\u679c\u3002 \u5728 Canvas \u4e2d\u5b9e\u73b0\u9ad8\u65af\u6a21\u7cca\u9700\u8981\u4ee5\u4e0b\u6b65\u9aa4\uff1a \u521b\u5efa\u753b\u5e03\u548c\u52a0\u8f7d\u56fe\u50cf\uff1a \u521b\u5efa\u4e00\u4e2a Canvas \u5143\u7d20\u5e76\u83b7\u53d6\u5176\u4e0a\u4e0b\u6587\u3002 \u4ece\u78c1\u76d8\u52a0\u8f7d\u8981\u6a21\u7cca\u7684\u56fe\u50cf\u3002 \u83b7\u53d6\u56fe\u50cf\u6570\u636e\uff1a \u4f7f\u7528 getImageData() \u65b9\u6cd5\u4ece\u539f\u59cb\u56fe\u50cf\u4e2d\u83b7\u53d6\u56fe\u50cf\u6570\u636e\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u50cf\u7d20\u6570\u636e\u7684 Uint8ClampedArray\u3002 \u5e94\u7528\u9ad8\u65af\u6a21\u7cca\uff1a \u521b\u5efa\u4e00\u4e2a\u4e00\u7ef4\u9ad8\u65af\u5185\u6838\u3002\u8fd9\u901a\u5e38\u662f\u5927\u5c0f\u4e3a\u5947\u6570\u7684\u6570\u7ec4\uff08\u4f8b\u5982 3×3\u30015×5 \u6216 7×7\uff09\uff0c\u5176\u4e2d\u5143\u7d20\u5bf9\u5e94\u4e8e\u9ad8\u65af\u5206\u5e03\u7684\u949f\u5f62\u66f2\u7ebf\u3002 \u904d\u5386\u56fe\u50cf\u50cf\u7d20\u6570\u636e\uff0c\u5e76\u9488\u5bf9\u6bcf\u4e2a\u50cf\u7d20\u5e94\u7528\u9ad8\u65af\u6a21\u7cca\u516c\u5f0f\uff1a newPixelValue = (kernel[0] * prevPixel) + (kernel[1] * currentPixel) + … + (kernel[n] * nextPixel) \u5728\u8fd9\u4e2a\u516c\u5f0f\u4e2d\uff0ckernel \u662f\u9ad8\u65af\u5185\u6838\uff0cprevPixel \u662f\u5f53\u524d\u50cf\u7d20\u524d\u9762\u7684\u50cf\u7d20\uff0ccurrentPixel \u662f\u5f53\u524d\u50cf\u7d20\uff0cnextPixel \u662f\u5f53\u524d\u50cf\u7d20\u540e\u9762\u7684\u50cf\u7d20\u3002 \u66f4\u65b0\u56fe\u50cf\u6570\u636e\uff1a \u4e00\u65e6\u5bf9\u6240\u6709\u50cf\u7d20\u5e94\u7528\u4e86\u6a21\u7cca\u516c\u5f0f\uff0c\u5c06\u66f4\u65b0\u56fe\u50cf\u6570\u636e ImageData \u5bf9\u8c61\u4e2d\u7684\u76f8\u5e94\u50cf\u7d20\u503c\u3002 \u5c06\u6a21\u7cca\u56fe\u50cf\u7ed8\u5236\u5230\u753b\u5e03\u4e0a\uff1a \u4f7f\u7528 putImageData() \u65b9\u6cd5\u5c06\u66f4\u65b0\u7684\u56fe\u50cf\u6570\u636e\u7ed8\u5236\u5230\u753b\u5e03\u4e0a\u3002\u8fd9\u5c06\u663e\u793a\u6a21\u7cca\u6548\u679c\u7684\u56fe\u50cf\u3002 \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9ad8\u65af\u6a21\u7cca\u7684\u8d28\u91cf\u5c06\u53d6\u51b3\u4e8e\u6240\u7528\u9ad8\u65af\u5185\u6838\u7684\u5927\u5c0f\u548c\u5f62\u72b6\u3002\u8f83\u5927\u7684\u5185\u6838\u5c06\u4ea7\u751f\u66f4\u5e73\u6ed1\u7684\u6a21\u7cca\uff0c\u800c\u8f83\u5c0f\u7684\u5185\u6838\u5c06\u4ea7\u751f\u66f4\u7cbe\u7ec6\u7684\u6a21\u7cca\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3890","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3890","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=3890"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3890\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}