通過matlab img處理粒度分佈的計算

Question

我需要計算我拍攝的照片中某些微尺寸粒子的周長。 首先我處理圖像，現在我想處理二維處理的圖像，粒子是白色的，背景是黑色的，如你所知。 所以我需要一些方法&代碼來計算像素單位中的粒子直徑&。有什麼建議麼？！ 在此先感謝

Answer 1

下面的代碼可以幫助你理解 -

%%// Input image 
BW = imread('text.png'); %%// Available in the MATLAB image library 
figure,imshow(BW) 

%%// Get the scalar distances around the boundaries of the regions/blobs 
P = regionprops(BW, 'Perimeter'); 

%%// Get scalar values that specifies the diameter of a circle with the same 
%%// area as the regions/blobs 
D = regionprops(BW, 'EquivDiameter'); 

%%// Get list of pixels based on their labeling. 
%%// Basically the indices of the structs produced by regionprops refer to the labels. 
pixel_list = regionprops(BW, 'PixelIdxList'); 

%%// Let us find out information about the first blob (blob that is labeled as 1) 

%%// 1. List of pixel coordinates as linear indices 
blob1_pixel_list = pixel_list(1).PixelIdxList; 

%%// Create an image of the same size as the original one and showing the 
%%blob labeled as 1 
blob1 = false(size(BW)); 
blob1(blob1_pixel_list) = true; 
figure,imshow(blob1) 

%%// Perimter of blob -1 
blob1_perimeter = P(1).Perimeter 

%%// Equivalent diameter of blob -1 
blob1_equivdiameter_values = D(1).EquivDiameter 

%%// Get perimeter and diameter values for all the blobs 
perimeter_values = struct2array(P) 
diameter_values = struct2array(D)