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IC693MDL230RR

IC693MDL230RR

圖像閾值分割（thresholding）是一種最常用的圖像分割方法，可將圖像按照不同灰度分成兩個(gè)或多個(gè)等間隔或不等間隔灰度區(qū)間，對(duì)目標(biāo)與背景有較強(qiáng)對(duì)比度的圖像分割特別有用。主要利用檢測(cè)目標(biāo)與背景在灰度上的差異，選取一個(gè)或多個(gè)灰度閾值，并根據(jù)像素灰度與閾值的比較結(jié)果對(duì)像素進(jìn)行分類，用不同的數(shù)值分別標(biāo)記不同類別的像素，從而生成二值圖像。由于物體與背景以及不同物體之間的灰度通常存在明顯差異，在圖像灰度直方圖中會(huì)呈現(xiàn)明顯的峰值，因此，若選擇圖像灰度直方圖中灰度分布的谷底作為閾值，即可對(duì)圖像進(jìn)行分割。

閾值分割法可分為全局閾值分割法(Global Thresholding）和局部閾值分割法（localthresholding）。

全局閾值分割法會(huì)基于整幅圖像的像素統(tǒng)計(jì)信息，選取固定的灰度閾值。它適用于每一幅待處理圖像中光照都均勻分布，或多幅圖像有一致照明的場(chǎng)合；

局部閾值分割法則基于鄰域內(nèi)像素的統(tǒng)計(jì)信息，為每個(gè)像素計(jì)算閾值。它對(duì)光線呈傾斜梯度分布或待測(cè)目標(biāo)有陰影的情況特別有效，而在這類情況下全局閾值分割法通常會(huì)失效。

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