1matlab畫素值及統計
阿新 • • 發佈：2018-12-21
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matlab畫素值及統計
2017年01月01日 16:08:55 furuiyang_ 閱讀數：71231.畫素資料值 impixel函式可以返回使用者指定的影象畫素的顏色資料值，impixel函式可以返回選中畫素或者是畫素集的資料值，可以直接將畫素座標作為該函式的輸入引數，或用滑鼠選中畫素。
imshow trees.tif
vals = impixel - 1
- 2
上面的程式碼執行後，得到如下圖所示的介面，
vals =
0.6118 0.6784 0.1922
0.7412 0.9059 1.0000
1.0000 0.9059 0.7765
0.4196 0.6784 0.8706- 1
- 2
- 3
- 4
- 5
- 6
即使是對於索引影象，該命令獲取的結果依然是畫素對應的顏色值，而不是索引值。
2.沿影象路徑資料值 improfile函式用於沿著影象中的一條直線段路徑或者是直線路徑計算並且繪製其顏色值，
I=fitsread('solarspectra.fts' - 1
- 2
- 3
執行後的介面，
imshow peppers.png
improfile- 1
- 2
3.影象等值線圖 可以使用matlab影象處理工具箱中的imcontour函式顯示灰度圖的等值線輪廓，這個函式能夠自動設定座標軸物件，使得方向和長款比能夠與所顯示的影象相匹配。
I=imread('cameraman.tif');
subplot(1,2,1)
imshow(I)
subplot(1,2,2)
imcontour - 1
- 2
- 3
- 4
- 5
4.影象柱狀圖 影象柱狀圖可以用來顯示索引影象或者是灰度影象中的灰度分佈，可以利用matlab影象處理工具箱中的imhist函式建立柱狀圖，
I=imread('cameraman.tif');
subplot(1,2,1)
imshow(I)
subplot(1,2,2)
imhist(I,64)- 1
- 2
- 3
- 4
- 5
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<span class="desc oneline">影象的矩陣表示
類和影象型別 雖然使用的是整數座標， 但 MATLAB 中的畫素值（亮度）並未限制為整數。 表 1-1 列出了 MATLAB 和影象處理工具箱為描述畫素值而支援的各種類。 表…
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【從零學習openCV】使用直方圖<em>統計</em><em>畫素</em> - Shawn-HT的專欄 </h4>
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影象處理: 如何將 <em>畫素</em>值 控制在 值域[0, 255] - Online Notes </h4>
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<span class="desc oneline">概念在做計算機視覺方向專案的時候，往往需要進行影象處理。但是在此過程中，常常會遇到 對 畫素值 進行 變換計算 後，畫素值 超出 值域區間 [0, 255] 的情況。再加上計算過程中各自 float型...</span>
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<span class="desc oneline">Getting Information about Image Pixel Values and Image Statistics
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<span class="desc oneline">Matlab讀取的影象的資料排列
對於24位的RGB影象，用imread讀取的資料為（h，w，3）的三維矩陣，（i， j，1:3）是第i行第j列畫素的R、G、B值；
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