SSMs, ASMs, AAMs, Deformable Model, snake, active contour

Statistical Shape Models (SSMs)

The shape of an object is represented by a set of n points, which may be in any
dimension. Commonly the points are in two or three dimensions. Shape is usually defined as
that quality of a configuration of points which is invariant under some transformation. In two
or three dimensions we usually consider the Similarity transformation (translation, rotation and scaling). The shape of an object is not changed when it is moved, rotated or scaled.

http://www.cmlab.csie.ntu.edu.tw/~cyy/learning/papers/PCA_ASM.pdf
https://en.wikipedia.org/wiki/Statistical_shape_analysis

Active shape models (ASMs)

Active shape models are statistical models of the shape of objects which iteratively deform to fit to an example of the object in a new image, developed by Tim Cootes and Chris Taylor in 1995.[1]
The shapes are constrained by the PDM (point distribution model) Statistical Shape Model to vary only in ways seen in a training set of labelled examples. The shape of an object is represented by a set of points (controlled by the shape model). The ASM algorithm aims to match the model to a new image.

The key idea of ASMs is to constrain the behavior of deformable models using
the PDM

Active Appearance Models (AAMs)

An active appearance model (AAM) is a computer vision algorithm for matching a statistical model of object shape and appearance to a new image. They are built during a training phase. A set of images, together with coordinates of landmarks that appear in all of the images, is provided to the training supervisor.

A limitation of the ASM is that its prior model does not consider gray-level variation of the object instance across images. To overcome this difficulty, Edwards, Cootes, and Taylor [84–86] proposed an extension to the ASM, called active appearance
models (AAM). In AAM, a new prior model is constructed using both shape and grey-level information.

Active contour model (Snake)

Active contour model, also called snakes, is a framework in computer vision for delineating an object outline from a possibly noisy 2D image. The snakes model is popular in computer vision, and snakes are greatly used in applications like object tracking, shape recognition, segmentation, edge detection and stereo matching.

GVF snake model
The balloon model
Diffusion snakes model
Geometric active contours

Deformable Models

Deformable models are curves or surfaces defined within an image domain that can move under the influence of internal forces, which are defined within the curve or surface itself, and external forces, which are computed from the image data.
Snakes: Active Contours by Kass, Witkin and Terzopoulos
level set
active shape models

Various names, such as snakes, active contours or surfaces, balloons, and deformable contours or surfaces, have been used in the literature to refer to deformable models.

最后編輯于
?著作權(quán)歸作者所有,轉(zhuǎn)載或內(nèi)容合作請(qǐng)聯(lián)系作者
  • 序言:七十年代末,一起剝皮案震驚了整個(gè)濱河市,隨后出現(xiàn)的幾起案子,更是在濱河造成了極大的恐慌,老刑警劉巖书斜,帶你破解...
    沈念sama閱讀 222,627評(píng)論 6 517
  • 序言:濱河連續(xù)發(fā)生了三起死亡事件,死亡現(xiàn)場(chǎng)離奇詭異,居然都是意外死亡造寝,警方通過(guò)查閱死者的電腦和手機(jī),發(fā)現(xiàn)死者居然都...
    沈念sama閱讀 95,180評(píng)論 3 399
  • 文/潘曉璐 我一進(jìn)店門吭练,熙熙樓的掌柜王于貴愁眉苦臉地迎上來(lái)诫龙,“玉大人,你說(shuō)我怎么就攤上這事鲫咽∏┰撸” “怎么了?”我有些...
    開(kāi)封第一講書人閱讀 169,346評(píng)論 0 362
  • 文/不壞的土叔 我叫張陵分尸,是天一觀的道長(zhǎng)锦聊。 經(jīng)常有香客問(wèn)我,道長(zhǎng)箩绍,這世上最難降的妖魔是什么孔庭? 我笑而不...
    開(kāi)封第一講書人閱讀 60,097評(píng)論 1 300
  • 正文 為了忘掉前任,我火速辦了婚禮材蛛,結(jié)果婚禮上圆到,老公的妹妹穿的比我還像新娘。我一直安慰自己仰税,他們只是感情好构资,可當(dāng)我...
    茶點(diǎn)故事閱讀 69,100評(píng)論 6 398
  • 文/花漫 我一把揭開(kāi)白布。 她就那樣靜靜地躺著陨簇,像睡著了一般吐绵。 火紅的嫁衣襯著肌膚如雪。 梳的紋絲不亂的頭發(fā)上河绽,一...
    開(kāi)封第一講書人閱讀 52,696評(píng)論 1 312
  • 那天己单,我揣著相機(jī)與錄音,去河邊找鬼耙饰。 笑死纹笼,一個(gè)胖子當(dāng)著我的面吹牛,可吹牛的內(nèi)容都是我干的苟跪。 我是一名探鬼主播廷痘,決...
    沈念sama閱讀 41,165評(píng)論 3 422
  • 文/蒼蘭香墨 我猛地睜開(kāi)眼蔓涧,長(zhǎng)吁一口氣:“原來(lái)是場(chǎng)噩夢(mèng)啊……” “哼!你這毒婦竟也來(lái)了笋额?” 一聲冷哼從身側(cè)響起元暴,我...
    開(kāi)封第一講書人閱讀 40,108評(píng)論 0 277
  • 序言:老撾萬(wàn)榮一對(duì)情侶失蹤,失蹤者是張志新(化名)和其女友劉穎兄猩,沒(méi)想到半個(gè)月后茉盏,有當(dāng)?shù)厝嗽跇?shù)林里發(fā)現(xiàn)了一具尸體,經(jīng)...
    沈念sama閱讀 46,646評(píng)論 1 319
  • 正文 獨(dú)居荒郊野嶺守林人離奇死亡枢冤,尸身上長(zhǎng)有42處帶血的膿包…… 初始之章·張勛 以下內(nèi)容為張勛視角 年9月15日...
    茶點(diǎn)故事閱讀 38,709評(píng)論 3 342
  • 正文 我和宋清朗相戀三年鸠姨,在試婚紗的時(shí)候發(fā)現(xiàn)自己被綠了。 大學(xué)時(shí)的朋友給我發(fā)了我未婚夫和他白月光在一起吃飯的照片淹真。...
    茶點(diǎn)故事閱讀 40,861評(píng)論 1 353
  • 序言:一個(gè)原本活蹦亂跳的男人離奇死亡讶迁,死狀恐怖,靈堂內(nèi)的尸體忽然破棺而出趟咆,到底是詐尸還是另有隱情添瓷,我是刑警寧澤,帶...
    沈念sama閱讀 36,527評(píng)論 5 351
  • 正文 年R本政府宣布值纱,位于F島的核電站,受9級(jí)特大地震影響坯汤,放射性物質(zhì)發(fā)生泄漏虐唠。R本人自食惡果不足惜,卻給世界環(huán)境...
    茶點(diǎn)故事閱讀 42,196評(píng)論 3 336
  • 文/蒙蒙 一惰聂、第九天 我趴在偏房一處隱蔽的房頂上張望疆偿。 院中可真熱鬧,春花似錦搓幌、人聲如沸杆故。這莊子的主人今日做“春日...
    開(kāi)封第一講書人閱讀 32,698評(píng)論 0 25
  • 文/蒼蘭香墨 我抬頭看了看天上的太陽(yáng)处铛。三九已至,卻和暖如春拐揭,著一層夾襖步出監(jiān)牢的瞬間撤蟆,已是汗流浹背。 一陣腳步聲響...
    開(kāi)封第一講書人閱讀 33,804評(píng)論 1 274
  • 我被黑心中介騙來(lái)泰國(guó)打工堂污, 沒(méi)想到剛下飛機(jī)就差點(diǎn)兒被人妖公主榨干…… 1. 我叫王不留家肯,地道東北人。 一個(gè)月前我還...
    沈念sama閱讀 49,287評(píng)論 3 379
  • 正文 我出身青樓盟猖,卻偏偏與公主長(zhǎng)得像讨衣,于是被迫代替她去往敵國(guó)和親换棚。 傳聞我的和親對(duì)象是個(gè)殘疾皇子,可洞房花燭夜當(dāng)晚...
    茶點(diǎn)故事閱讀 45,860評(píng)論 2 361

推薦閱讀更多精彩內(nèi)容