わかりやすい画像のdiffを求めて - Qiita
どうも。フロントエンドエンジニアの @Quramy です。 さて、前回、1日10万枚の画像を検証するためにやったことで書いているとおり、reg-suitという画像に特化した回帰テストツールをメンテしています。 画像回帰テストという文脈において、差分の可視化方法はとても重要なファクターです。なぜなら、画像(=スナップショット)に差分が発生したからといって、それすなわち棄却、というわけではなく、その差分の内容を判断して、意図せぬ変更であれば棄却、意図した変更であればexpectedを更新する必要があります。すなわち、ワークフローに目視による差分のレビューが発生するのです。 そこで、少しだけ異なる2枚の画像について差分を効果的に可視化する、というテーマに向き合ってみました。 主にC++とOpenCVでの実装ですが、これらの知識が無くとも読めるよう、コードやAPIへの言及を少なくして、中間画像で説
マジックカーネル – 画像のリサンプリングのメソッド | POSTD
マジックカーネルとは？ “マジックカーネル”とは、極めて高速で（一番単純なバージョンなら、必要なのは少しの整数加算とビットシフトのみです）、驚くほどの結果を出してくれる効果的な画像のリサンプリングのメソッドです（エイリアシングノイズやリンギング、細かい物体の”Width beat”の発生を防ぎます）。 私がこのマジックカーネルと出会ったのは2006年、一般的に使われているJPEGライブラリのソースコードを扱っていた時のことです。それ以来、この素晴らしい特性を深く探り、任意のリサンプリングファクタのケースにまでこのメソッドを広げました。 このWebページでは、それらの特性を要約して説明し、画像への適用も含めてマジックカーネルのC#のコード実装の全てをご紹介します。 マジックカーネルはどこから来たのか 2006年に私は、JPEGを過剰に圧縮すると発生するブロックノイズを最小限に抑えるいい方法は
Automating xkcd Diagrams: Transforming Serious to Funny—Wolfram Blog
On early Monday morning I noticed an interesting question posted on Mathematica Stack Exchange titled quite innocently “xkcd-style graphs.” Due to the popularity of Randall Munroe’s xkcd web comic, I expected a bit more than average of about ten or so up-votes, a few bookmarks. Little did I know. Spontaneously emerging viral events are hard to predict, so if you are lucky to catch one, it is fasci
Breaking the MintEye image CAPTCHA in 23 lines of Python | jwandrews.co.uk
As an avid reader of HAD I was intrigued by this post explaining how someone had broken MintEye’s audio based CAPTCHA. The image version of the CAPTCHA looked interesting and so I thought it might be fun to try and break it. For those unfamiliar with MintEye, the image based CAPTCHAs look as follows: You must adjust a slider to select the undistorted version of the image. Several somewhat naive
Restoration of defocused and blurred images. Yuzhikov.com
Restoration of defocused and blurred images by Vladimir Yuzhikov Restoration of distorted images is one of the most interesting and important problems of image processing - from the theoretical, as well as from the practical point of view. There are especial cases: blurring due to incorrect focus and blurring due to movement - and these very defects (which each of you knows very well, and which ar
slowmoVideo .:: slowmoVideo.granjow.net
Welcome slowmoVideo is an OpenSource program that creates slow-motion videos from your footage. But it does not simply make your videos play at 0.01?? speed. You can smoothly slow down and speed up your footage, optionally with motion blur. How does slow motion work? slowmoVideo tries to find out where pixels move in the video (this information is called Optical Flow), and then uses this informati
Saving canvas data to image file
This is a small library that lets you easily save a WHATWG canvas element as an imagefile. Files needed: canvas2image.js, base64.js Draw on the canvas with the pretty boxes below using the mouse, then click the "Convert" buttons to convert it to a downloadable image - or the "Save" buttons to download the image file directly. Using the WHATWG canvas element, you can create all sorts of cool gr
Is your system ICC Version 4 ready?
Is your system ICC Version 4 ready? One way to find out is to view or print this page using your system. The test image below uses a mix of unusual ICC version 4 and version 2 profiles, one for each quadrant of the image. The test is also available in pdf format, as in both html and pdf file formats each image can use an unique profiles.
Graphviz
Please join the Graphviz forum to ask questions and discuss Graphviz. What is Graphviz? Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design, machine learning, and in visual inter
TeXclip: PowerPointに貼り付けるTeXの数式をWebで生成
IE7 or Firefox2 is required. Older browsers don't work proper. TeX-based equation image editor for PowerPoint on the web TeXclip is the web application for the people, who prefer TeX than PowerPoint's equation editor. After the time TeXPoint became shareware, I have been working on TeXclip and got good feedback from my colleague. And now TeXclip is released to public. Only web browser (IE7 or Fire
Smart Image Resizing while Preserving Transparency With PHP and GD Library | Medium eXposure
Smart Image Resizing while Preserving Transparency With PHP and GD Library Should be easy to find, right? All you want is a function that resizes an image to constraints (doesn't care if it should scale up or down), with possibility to select if you want to keep it proportional, and possibility to use either width or height as the constraint. Also, you want it to preserve transparency damn it! Sur
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写真を絵のように見せる写真加工技術「PhotoDramatica」トップ - あやえも研究所
大規模画像認識とその周辺
placekitten
今日の天気図かっけえええええ
Open Clip Art Library
顧客が本当に必要だったもの
[CG Textures] - The worlds largest free texture site![[CG Textures] - The worlds largest free texture site](https://cdn-ak-scissors.b.st-hatena.com/image/square/0eda3a1dee04166bde738ce6866cf1f0723cd93c/height=288;version=1;width=512/https%3A%2F%2Fwww.textures.com%2Fimages%2Ffacebook_generic_share.jpg%3Fv%3D5)
ImageJ
Motion DSP - About