Cv2 comparehist. the person names will display on image.
1．認識対象画像用意. Jan 8, 2011 · Apply sequentially the 4 comparison methods between the histogram of the base image (hist_base) and the other histograms: for ( int i = 0; i < 4; i++ ) { int compare_method = i; double base_base = compareHist ( hist_base, hist_base, compare_method ); double base_half = compareHist ( hist_base, hist_half_down, compare_method ); compareHist() 用於比較兩個影像的 histograms。 EMD() 用於影像處理和電腦視覺來比較影像的各種特徵 calcBackProject() 使用目標物體的特徵 (例如: color) 的 histogram，然後使用該 histogram 在另一個影像中尋找該物體。 Dec 2, 2022 · The histograms of two images can be compared using cv2. compareHist(histr,histg,cv2. 1、直方图比对compareHist. Alternative: Aug 10, 2020 · compHistによるヒストグラムの比較の仕方 次のようにしてヒストグラムの比較をおこないます。. In this sense, as histograms reflect the intensity distributions of the pixel values in the image, this function can be used to Feb 18, 2004 · 계산된 히스토그램을 compareHist 함수로 히스토그램을 비교하여 색상 분포가 얼마나 비슷한지를 알 수 있다. mask – The operation mask, determines what pixels of the source images are counted. imread('base2. img1 = cv2. 由于直方图反映了图像中像素值的强度分布，因此该函数也可以用于比较图像，但是由于直方图仅显示统计信息，而不显示像素的位置 Sep 15, 2023 · また、cv2. compareHist(image1_hist, image3_hist, 0)) # 0. 実施結果. H1 = H1. 参数含义： H1：输入图像直方图； H2：输入图像直方图，和H1相同的尺寸； method：比较方法； Python-Opencv中用compareHist函数进行直方图比较进而对比图片. compareHist()。 Mar 27, 2022 · OpenCV method: compareHist() Template matching. pip install opencv-python. OpenCV provides functions like cv2. compareHist(H1, H2, method) Here, H1 and H2 are the histograms we want to compare and the “method” argument specifies the comparison method. This feature allows user to compute a single histogram from several images, or to update the histogram online. It returns a numerical parameter Cv2 Class. A good example here matchTemplate finding good match. Post navigation ← Add borders to the image using OpenCV-Python Earth Mover’s Distance (EMD) → Apr 29, 2013 · The function signature is as follows: cv2. CompleteSymm ( OpenCvSharp. compareHist函数 opencv有一个内置的方法可以方便地比较直方图：cv2. 2 documentation. CMP_GT) every element in array A is compared with every element in array B. OpenCV provides the cv2. compareHist and its metrics OpenCV provides us with a function to compare two histograms called compareHist . 以上がPythonとOpenCVを使用して、ヒストグラムの類似度を計算する基本的な方法です。 Apr 29, 2021 · You'll only need to raise the minimum saturation value for an HSV mask to effectively mask away all the white background: import cv2 import numpy as np def get_masked(img): img_hsv = cv2. HISTCMP_BHATTACHARYYA a = cv2. normalize(hist_pic3, hist_pic3) Then I plot my histograms in function of the 3 channels (H,S,V): Finally I compute the distances between every channels separately of pic1 and pic2/pic3 and I also compute the distance by taking the channel together: methodName = 'Chi-Squared'. write(list(hist)) # save 'hist' as a list string in a text file. In this tutorial you will learn how to: Use the function cv::compareHist to get a numerical parameter that express how well two histograms match with each other. Apr 6, 2019 · thanks Heitor! that's a really interesting method, i'm just going ahead and try it out. methodは比較方法をあらわし、以下のようなものがあります。. 直方图均衡化的中心思想是把原始图像的的灰度直方图从比较集中的某个区域变成在全部灰度范围内的均匀分布。. It convolves the search image with the one being search into. py","path":"analisys/histogram/backproject. compareHist方法的具体用法？Python cv2. OpenCV provides the compareHist() function to facilitate this comparison. at<double>(i,0) = exp(i); } cout <<compareHist( matTest, matTest,3)<<endl; I got this OpenCV Error: Assertion failed (H1. Sequence item with index 0 has a wrong type > - Can't parse 'pt1'. imwrite('logo_hat_match2. Feb 28, 2024 · Histogram Comparison is a method where histograms of both images are compared using various methods such as correlation, chi-square, intersection, or the Bhattacharyya distance. compareHist() を使って類似画像を探してみます。 ヒストグラムの計算は、画像の色空間を BGR から HSV 色空間に変換し、Hue (色相) のヒストグラムの比較により、ヒストグラムが Jul 29, 2014 · The question is how to feed these two arrays into cv2. OpenCV provides several built-in methods for histogram comparison as shown below. When I calculating the chi-square distance between 2 histograms in Python 3. To compare two images, you can do something like Template Matching in OpenCV. ざっくり言うと、色合いで比較する手法です。. import cv2. Jun 16, 2021 · Euclidean distance between RGB histogram of two images. You need not use calcHist () or np. 検証1: ヒストグラム比較. By using some opensource Library, like OpenCV, Scikit Learn, TensorFlow. py Project: henryzord/ImageRetrieval. In simple words, given the following instance: cv2. compareHist(histvec_cake, histvec_cwc, 0) -0. Histogram Comparison is a technique that compares the color or intensity distribution of two images. line is being passed have to be comprised of ints. HISTCMP_CORREL) 值越大，相关度越高，最大值为1，最小值为0; 卡方比较(method=cv. calcHist (images, channels, mask, histSize, ranges [, hist [, accumulate ]]) #返回hist. CompareHist(src, src1, cv2. xmatch = 417 ymatch = 44. I'm new with the c++ interface (cv::Mat) and calculating histograms in OpenCV. A perfect correlation score would be ‘1. then later: hist = np. imread('base3. type() && H1. 5) :-1: error: (-5:Bad argument) in function 'line' > Overload resolution failed: > - Can't parse 'pt1'. png') #Set hist parameters hist_height = 64 hist_width = 256 nbins = 32 bin_width = hist_width/nbins hrange = [0,180] srange = [0,256] ranges = hrange+srange Jan 8, 2020 · 色合いが似ているものを探す。 BGRをHSVに変換してHチャンネルのヒストグラムを比較。OpenCVのヒストグラム比較関数compareHistには比較方法がいくつかあるが、ここではHISTCMP_CORRELを使った。画像データは前回と同様。 import numpy as np import cv2 import … Apr 29, 2020 · openCVの関数であるcalcHist、compareHistについては以下の画像で説明しています。 参考サイト. public static double CompareHist ( InputArray h1, InputArray h2, HistCompMethods method) Feb 27, 2024 · Method 1: Correlation. A single number: dist=sqrt( ( (bin1a-bin1b)^2 (bin256a-bin256b) ) / 256), where bin1a in the first bin count of imageA and bin1b is first bin count of imageB, etc. Matplotlib comes with a histogram plotting function : matplotlib. Apr 1, 2019 · There is a built-in function in OpenCV cv2. histogram(bob1) ph1 = plt. Comparing histograms by correlating them is a statistical method that measures the linear relationship between the intensity distributions of two images. 1. compare performs an element-wise comparison. ファイルごとに1つのヒストグラムしか保存できない場合は、簡単なテキストファイルを使用するのが最も簡単な方法です。. cv2. png' img_bgr = cv2. 通过 <kbd>cv2. HISTCMP_CORRELを指定した場合、計算される値はヒストグラムが近いほど1に近く、遠いほど-1に近くなります。. compareHist(), then appears the following error: 3 days ago · Long Way : use OpenCV drawing functions. compareHist. show() #looks nice, get 3 bars per bin h2 = np. compareHist() function to execute this comparison. 我们可以使用 OpenCV 的 compareHist() 函数找到两个图像之间的相似性。compareHist() 函数根据颜色比较两个图像的直方图。 此方法仅根据颜色比较图像，因此在我们不关心对象的形状或方向的地方很有用。 Python cv2 模块， compareHist() 实例源码. HISTCMP_CHISQR): Jul 25, 2020 · cv2. 2 days ago · The function cv::compareHist compares two dense or two sparse histograms using the specified method. imread(image_file) height, width, channe Aug 19, 2015 · hist_f = cv2. 7. compareHist(H1, H2, method) 其中： H1，H2 分别为要比较图像的直方图; method – 比较方式 ; 比较方式（method） 相关性比较 (method=cv. 图像直方图是反映一个图像像素分布的统计表，其实横坐标代表了图像像素的种类，可以是灰度的，也可以是彩色的。. If you're still struggling with this; I found the answer, searching through the cv2. def compare_histogram(a_hist, b_hist, method=cv2. 0 value, with values close to 0. In addition to the histograms in question, this function takes as an argument which metric of comparison should be applied. Python OpenCV3で度数分布を算出してヒストグラム出力 - from umentu import stupid. OpenCV implements the function cv::compareHist to perform a comparison. 詳細は以下を参照ください。. Mar 13, 2012 · I'm trying to compare two histograms which I stored as an array. For example, if you use correlation as your compare method then the value of result will lie between 0-1 and higher the value higher is the matching. In OpenCV two histograms can be compared using the function cv2. Cross-bin comparison: which includes include Earthmoving distance (EMD), quadratic form distances (taking into account the bin similarity matrix), etc. import numpy as np. flatten() Feb 28, 2024 · Method 3: Histogram Comparison. compareHist方法的典型用法代码示例。如果您正苦于以下问题：Python cv2. array(eval(file. You can rate examples to help us improve the quality of examples. 下面是一个简单的示例代码，演示如何使用OpenCV库实现图像对比：. arrowedLine() method is used to draw arrow segment pointing from the start point to the end point. These histograms represent the distribution of pixel intensities. compareHist(H1, H2, method) ->retval. imwrite CSV（カンマ区切り値）などの標準データファイルを使用します。. cvtColor(img, cv2. Frames are extracted successfully, and the values of the difference, the variance, and the threshold appear, as well. HISTCMP_CHISQR) When I debugging this, there will be a warning which says 'Expected Ptr<cv::umat> for argument '%s'. compareHist(histvec_cake, histvec_curry, 0) -0. 我们从Python开源项目中，提取了以下22个代码示例，用于说明如何使用cv2. jpg') # 将图像转换 Mar 7, 2019 · Pythonの画像処理ライブラリOpenCVには画素値(輝度)と画素数のヒストグラムを求めるcalcHist関数があります。またcompareHist関数を使うとヒストグラムの類似度が求められます。2つの画像のチャンネル別のヒストグラムを表示し、ヒストグラム類似度を求めます。 本文整理汇总了Python中cv2. Some questions: * I take the zero norm per-pixel is going to be 0. The function calculates the histogram of one or more single-channel images. 通过compareHist()可以从直方图的角度对比2幅图像的相关性，比较的对象可以是1D或2D直方图。 接口形式： cv2. Modified 3 years, 10 months ago. 3．机の箇所 Dec 5, 2021 · 通过compareHist()可以从直方图的角度对比2幅图像的相关性，比较的对象可以是1D或2D直方图。 接口形式： cv2. Apr 22, 2021 · Since now, I know how to obtain it using cv2. Jan 8, 2013 · The function cv::compareHist compares two dense or two sparse histograms using the specified method. Syntax: cv2. histogram () function to find the histogram. Jan 4, 2022 · 3. All i want to know if both histogram are matched then the value should be 1. bitwise_and(img, img, mask=mask) img1 = cv2. The hist1 and hist2 are histograms of the two input images and compare_method is a metric to compute the matching between the histograms. Ask Question Asked 3 years, 10 months ago. calcHist([flat], [0], None, [256], [0, 256]) print cv2. Jul 9, 2018 · 結果 # ケーキの画像とケーキと珈琲の画像の比較 cv2. pyplot. Aug 20, 2012 · Try to use cv2. 第一个参数必须用方括号括起来。. compareHist ( H1, H2, method ) → retval ¶ C: double cvCompareHist ( const CvHistogram* hist1 , const CvHistogram* hist2 , int method ) ¶ Feb 15, 2024 · 使用 OpenCV 的 compareHist() 函数比较图像. compareHist 今日の内容は以上です。 今日もブログを読んでくださりありがとうございました！！ 次は何をしようかなー。 Oct 13, 2023 · 本文深入探讨了 OpenCV 直方图比较的原理和应用，详细介绍了 cv2. Image similarity, for example Aug 13, 2019 · This entry was posted in Image Processing and tagged cv2. Cv2 Methods. png') base3 = cv2. 13217840935957162 # ケーキの画像とカレーの画像の比較 cv2. 5. 0-1. 上篇博客 Python OpenCV 图像处理之图像直方图，取经之旅第 25 天 中，我们重点学习了直方图的绘制方法与应用，本篇博客继续对直方图进行分析。. InputOutputArray mtx, bool lowerToUpper = false ) : void: extends the symmetrical matrix from the lower half or from the upper half Jul 9, 2018 · I generated a texture image like this I have to compare two textures. If the value is ‘0’ then the face is detected correctly. To compare two histograms ( H1 and H2 ), first we have to choose a metric ( d(H1,H2)) to express how well both histograms match. There are many ways to do. error: OpenCV(4. The elements of a tuple that is used to increment a histogram bin are Theory. compareHist(), Earthmoving distance opencv python, histogram comparison opencv python, histograms, image processing, opencv python tutorial on 13 Aug 2019 by kang & atul. png', result) Match location on input: Match Information: correlation match score: 1. The cv2. ヒストグラム — opencv 2. compareHist (hist_1, hist_2, method) hist_1とhist_2はヒストグラムをあらわすNumPy arrayです。. image_file = 'output_ori. metrics import structural_similarity as ssim import argparse import imutils import cv2 # 2. Mar 16, 2018 · If it's OK for you to store only one histogram per file, the easiest solution is to use a simple text file: file. compareHist() function. The main applications of the image similarity technique include e-commerce product matching, image retrieval, object recognition, and face recognition. HISTCMP_INTERSECT cv2. Jul 9, 2024 · The function cv::compareHist compares two dense or two sparse histograms using the specified method. Try the following, assuming i_lab is a three-channel image: cv2. histogram(mark1) ph2 = plt. Show file. It also offers 4 different metrics to compute the matching: Correlation ( cv::HISTCMP_CORREL ) d ( H 1, H 2) = ∑ I ( H 1 ( I) − H 1 したがって、それを保存することはできません cv2. 8882466100801328 NamPy配列ndarrayの一致している要素数の比率 こちらは2つの画像のNamPy配列ndarrayの要素（画素値）を比較し、一致している要素（画素値）数の比率で、画像の一致率を割り出していく方法です。 Aug 13, 2019 · OpenCV provides a builtin function for comparing the histograms as shown below. HISTCMP_CHISQR 值越小，相关度越高，最大值无上界，最小值0 Mar 6, 2019 · In fact, I tried with the formula, with NumPy built-in function and also looking to the source code of OpenCV and trying to replicate it ( link from line 1923). imread('image2. py","contentType Nov 12, 2016 · The main parameters to give as input to these functions are the array (or image), the number of bins and the lower and upper range of the bins. compareHistによるヒストグラム比較 compareHist により2つのヒストグラムの類似度を算出できる。ヒストグラム類似度は各階級の度数の差を積算することで求められる。算出アルゴリズムは複数ありいずれかを指定する。 compareHist の書式は以下の通り。 Oct 9, 2013 · Your question is one of the classic ones in computer vision and image processing. jpg', 0) 基础知识铺垫. compareHist for distance measures like chi-squared, correlation, intersection and Bhattacharya distance, but what about Mathematica? image-processing histograms One interesting functionality offered by OpenCV in connection with histograms is the cv2. loadtxt('h_hist. compareHist()，该函数可用于计算两个直方图的匹配程度。. compareHist() which take as input the histogram parameters and the May 28, 2021 · The histogram comparison methods can be classified into two categories: Bin-to-Bin comparison: which includes L1, L2 norm for calculating the bin distances or bin intersection, etc. compareHist = cv2. 本篇博客咱们首先学习一下，如何用直方图去比较两幅图片的相似性。. array([0, 50, 0]) upper = np. 上記画像から机の部分画像を切り取り. compareHist を利用して類似画像を検索する. 認識対象用の画像を用意. It also offers 4 different metrics to compute the matching: and N is the total number of histogram bins. __dict__ Mar 9, 2022 · cv2. CompareHist ( hist1, hist2, method ) → float ¶ 模様系のパターンのマッチングでは結構使える印象. compareHistのmethod引数を変更することで比較方法も自由に選べます。 以上がヒストグラムの類似度を用いたテンプレートマッチングの説明となります。これを応用することで、様々な状況下でも安定したマッチング結果を得ることが可能になります。 Nov 13, 2020 · print(cv2. inRange(img_hsv, lower, upper) return cv2. compareHist(hist_f, hist_s, method=0) returns 1. Viewed 62 times 0 Im trying to compare two discrete {"payload":{"allShortcutsEnabled":false,"fileTree":{"analisys/histogram":{"items":[{"name":"backproject. 0’, which implies that the histograms are identical. May 25, 2016 · 1. 0. HISTCMP_CHISQR cv2. the person names will display on image. Using Matplotlib. ヒストグラムというのは、画像の特徴量を示す数値です。. destroyAllWindows() # save results. jpg') img2 = cv2. 4 with OpenCV 4. Here's the code. HISTCMP_CORREL) print 'compareHist - OpenCV: ', compareHist. imread("apple1 Jul 10, 2018 · import cv2 import numpy as np from matplotlib import pyplot as plt camera = cv2. compareHist(H1, H2, method)。 该 函数 有三个参数：H1：要 比较 的第一个 直方图 ；H2：要 比较 的第二个 直方图 ；method： 比较 的方法。 C++: double compareHist(const SparseMat& H1, const SparseMat& H2, int method)¶ Python: cv2. png') base2 = cv2. compareHist (H1, H2, method) → retval¶ C: double cvCompareHist ( const CvHistogram* hist1 , const CvHistogram* hist2 , int method ) ¶ Python: cv. 0 meaning picture matches perfectly. 060916866737834856 # 同じ写真同士の比較 cv2. imread('base1. OpenCV method: matchTemplate() Jan 3, 2023 · OpenCV-Python is a library of Python bindings designed to solve computer vision problems. VideoCapture(1) base1 = cv2. image1 = cv2. Without the mask, the large green area in the template would mismatch in the input and lower the match score dramatically. Now, I want to know how to extract some characteristics as mean, variance, normalised variance and entropy. I'm evaluating compareHist () and when I compare a 'flat' histogram with a single spike, the correlation value is 1. read()) # read list string and convert to array. CompareHist(src, src0, cv2. 第二个参数是用于计算直方图的通道 Sep 4, 2023 · Applications. resize(image3 Dear OpenCV Community, I had tried to work with compareHist built-in function using CV_64F to compare a personalized MatND variables as follow MatND matTest(Size(1,8), CV_64F, Scalar(0)); for(int i= 0; i < 8 ;i++){ matTest. compareHist() to perform this comparison, which can be a good method for shape matching if the shapes have distinct color distributions. 類似画像検索システムを作ろう - 人工知能に関する断創録. compare(a, b, cv2. HISTCMP_CORREL) should work Share Improve this answer We would like to show you a description here but the site won’t allow us. In the below code snippet, we are reading all images from the folder and extracting the histograms from them and storing the 实现图像对比的示例代码. compareHist怎么用？Python cv2. It seems like the problem is on the 'method' arguement. compareHist() function, which can be used to get a numerical parameter expressing how well two histograms match each other. hist(bob1) plt. They all return different value. Many doctoral theses have been written and scores of papers in conferences and journals. The problem is when I want to use this loaded histogram and compare it with a new one using cv2. calcHist(images, channels, mask, histSize, ranges[, hist[, accumulate]]) -> hist. hist(mark1) #the problem occurs here: d 01_2画像のヒストグラム比較による類似度の算出. Feb 27, 2013 · I am having confusion in understanding compareHist() Method ,Can't seem to understand whats the meaning of return value by each different method. Here is the relevant part of my code, after creating my np arrays called "bob1" and "mark1": ----- h1 = np. compareHist(). 2, I use the following code: dis = cv2. 000. type() == H2. calcHist. Plot of the two histograms (spike=red, flat=blue): add a comment. 可以使用pip命令进行安装：. Apr 4, 2022 · hist_pic3 = cv2. 纵坐标代表了每一种颜色值在图像中的像素总数或者占所有像素个数的 May 14, 2018 · 方法一：使用OpenCV cv2. Here's the code frames are extracted successfully, and the values of the difference, the variance, and the threshold appear, as well. ディレクトリ内の5000枚の画像から cv2. The key point is that the channels, histSize and ranges parameters should be flat lists, not nested lists as in your example. 色合いで比較するの Feb 4, 2013 · Python: cv2. I have used histogram comparison method. compareHist(H1, H2, cv2. measure import compare_ssim from skimage. CompareHist will return value. COLOR_BGR2HSV) lower = np. array([179, 255, 255]) mask = cv2. CompareHist ( InputArray h1, InputArray h2, HistCompMethods method) : double: compares two histograms stored in dense arrays. CMP_GT is used to check whether the element in A is greater than of B in each comparison. compareHist() too. Ok, now all 3 ways is working, but what is the best/fast and more opencv-way method? And cv2. HISTCMP_CORREL cv2. 图像直方图. compareHist(h1, h2, method). compareHist(histvec_cake, histvec_cake, 0) 1. それを比較することで類似度を算出するプログラムを作ってみました。. Accumulate Method . See the code below: Mar 16, 2014 · double result = compareHist( image, template, compare_method ); The value of your result will depend upon the compare_method you use. hist () It directly finds the histogram and plot it. While the function works well with 1-, 2-, 3-dimensional dense histograms, it may not be suitable for high-dimensional sparse histograms. imread('image1. Downsides: It only returns good results with identical images, same size & orientation. 1. Cv2 CompareHist Method : compares two histograms stored in dense arrays public static double CompareHist ( InputArray h1, InputArray h2, HistCompMethods method) . arrowedLine(image, start_point, end_point, color, thickness, line_type, shift, tipLength)Parameters: image: It is the image on which line is to b Mar 27, 2021 · I'm working on keyframe extraction using absolute difference of histogram. txt', ndmin=2) I think it's all ok, because when I print histr_hx and txtHist, both have the same structure, appearance and type. 2．机模様パターン画像用意. calcHist() and plot it with the matplotlib library and how compare two histograms using cv2. CV_COMP_BHATTACHARYYA) sc1= cv2. 0. It is usually used to find smaller image parts in a bigger one. Aug 28, 2019 · Using cv2. Example #1. 首先，我们需要安装OpenCV库。. CV_COMP_BHATTACHARYYA) In above each instruction compare the image faces with database faces. type() == CV_32F) in cv 本节，我们将介绍 OpenCV提供的另一个与直方图相关的函数是 cv2. import cv2 Aug 28, 2017 · Using python we need to find similarities between any type of image. edit flag offensive delete link more Comments. 参数含义： H1：输入图像直方图； H2：输入图像直方图，和H1相同的尺寸； method：比较方法； method包含6种方法，整数数值从0~5： sc0= cv2. 3 days ago · To compare two histograms ( H 1 and H 2 ), first we have to choose a metric ( d ( H 1, H 2)) to express how well both histograms match. That is the distance is the square root of the average of the squares of the difference between corresponding bins) Jul 19, 2022 · cv2. compareHist</kbd Mar 22, 2022 · Import the necessary packages #from skimage. The flag cv2. ※ 물론 색상분포만 같은 것으로 같은 그림이라고 할 수 없기 때문에 matchTemplate함수와 함께 사용하면 더욱 정확하게 동일한 그림을 찾을 수 있다. # 读取两幅图像. Goal . The function returns \(d(H_1, H_2)\) . imread('img. resize(image2, img_size) image3 = cv2. File: features. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. compareHist() 函数，涵盖了距离度量方法的细微差别，并提供了代码示例。此外，还探讨了图像比较的实际应用，例如图像检索、目标检测和场景识别，从而揭示直方图比较在计算机视觉领域的强大作用。 cv2. resize(image1, img_size) image2 = cv2. 方法 概要 cv2 These are the top rated real world Python examples of cv2. img = cv2. ; Use different metrics to compare histograms Jun 8, 2020 · Here is how I load it with numpy too: txtHist = np. compareHist extracted from open source projects. compareHist使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。 cv2. Sequence item with index 0 has a wrong type From what I've read from another thread, the tuples cv2. 0 The following are 19 code examples of cv2. size)? I have to compare two images using cv2. compareHist() function accepts three input arguments- hist1, hist2, and compare_method. イラストの机模様のパターンをもとに机の箇所を特定してみた. Abs Method . 0! This is obviously wrong (by hand I get double compareHist(const MatND& H1, const MatND& H2, int method)¶ double compareHist ( const SparseMat& H1 , const SparseMat& H2 , int method ) 2つのヒストグラムを比較します． I'm working on keyframe extraction using absolute difference of histogram. 0 meaning "images are the same", correct? * what if the 2 image sizes are different? the zero norm per-pixel will be slightly off, no (since it uses img1. Absdiff Method . Sep 19, 2020 · Implementing CV2 compareHist. compareHist (hist1, hist2, cv2. from matplotlib import pyplot as plt. 0 if does not match then it should be 0. 参数含义： H1：输入图像直方图； H2：输入图像直方图，和H1相同的尺寸； method：比较方法； OpenCV provides a builtin function for comparing the histograms as shown below. nf qd mq tv pw th zw kg qu el
