So you should divide by 255 in your code, as shown below. Is it possible to hide or delete the new Toolbar in 13.1? #import modules . See the following article for information on reading videos instead of still . It's default value is cv2.IMREAD_COLOR; Return: Image array. So when you use cv2.imread() it reads data uint8, that is 8-bit unsigned format thus imshow() displays the original data. imread () returns a numpy array containing values that represents pixel level data. Connect and share knowledge within a single location that is structured and easy to search. Webto read an image in python using opencv, use cv2.imread () function. In general, only 8-bit single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions: cv2.imread () function of OpenCV that is commonly used to read the image from the file. It returns a numpy.ndarray (NumPy N-dimensional array) after loading the image successfully. imread() is one of the most useful and frequently-used methods of the OpenCV-Python library. Here the loaded image has only three channels Blue Green & Red as the flag value is cv2.IMREAD_COLOR. What exactly are the data augmentation experimental Keras' layers doing? . Then we have used the cv normalized syntax. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? It also reads a PIL image in the NumPy array format. Is there any reason on passenger airliners not to have a physical lock between throttles? you can read image as a grey scale, color image or image . path. When the flag is passed with the value cv2.IMREAD_UNCHANGED then the image is loaded into the program as it is along with the alpha or transparency channel if its there. What's the \synctex primitive? I notice the code samples use a different data type: see vis = np.zeros ( (max (h1, h2), w1+w2), np.uint8). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Hope you are excited to experiment more with the Python imread() method and other methods of the opencv-python library using your own sample images! But for a colored image, you need 3D array. cv2. you can read image as a grey scale, color image or image . This image is (width, height)= (180, 220), the backgroud of it is transparent. . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. rev2022.12.9.43105. The only thing you need to care for is that {0,1} is mapped to {0,255} and any value bigger than 1 in NumPy array is equal to 255. . When flag is passed with the value cv2.IMREAD_COLOR then the image is first converted to the three-channel BGR color image with no transparency channel and then loaded into the program. Is energy "equal" to the curvature of spacetime? 'image' is a reference to an element of a list of numpy arrays. To read an image in Python using OpenCV, use cv2.imread () function. In this tutorial, we will learn how to use imread() method of OpenCV-Python in detail and different ways to load an image using imread() method. Connect and share knowledge within a single location that is structured and easy to search. Here at first, we have imported cv2. Read Image using cv2.imread () OpenCV Python Idiot Developer | by Nikhil Tomar | Analytics Vidhya | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our end. It converts PIL instance to numpy array, but in this case image will stay in BGR format as the image is loaded by cv2. As we already know, OpenCV represents an image as a NumPy array comprising integers that represent the pixels and intensity- hence, by indexing and slicing portions of the NumPy array, we are essentially isolating specific pixels thereby isolating specific portions of the image itself, thus allowing us to effectively crop the image. Can virent/viret mean "green" in an adjectival sense? If the image cannot be read (because of missing file, improper permissions, unsupported or invalid format) then this method returns an empty matrix. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The output tuple has three values 512 is the number of rows (height of the image) in the sample image, 512 is the number of columns (width of the image), and 4 is the number of channels. The two parameters are as follows: Return Value: cv2.imread() method returns a numpy.ndarray (NumPy N-dimensional array) if the loading of the image is successful. Note: If buf given is not image data then NULL will be returned. Ready to optimize your JavaScript with Rust? For further information this might be useful: Asking for help, clarification, or responding to other answers. Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field. For that, we will create a numpy array with three channels for Red, Green and Blue containing random values. import cv2 import numpy as np import requests Step 2: Read the image The second step is to read the image. In this tutorial, you have learned the different ways to load an image just by using different values of the flag parameter. We can also use 1 in place of cv2.IMREAD_COLOR. If the image is 8-bit unsigned, it is displayed as is. Use MathJax to format equations. If not given, the format is deduced from the filename. OpenCV is not necessary in the latter case. Asking for help, clarification, or responding to other answers. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? How to perform regression on image data using Tensorflow? That Storing and loading bottleneck features for transfer learning on large data sets (Keras), Applying activation on part of the layer in Keras. Keras is possible to run on the top of the TensorFlow framework and hence that is mandatory to have. Image binarization with NumPy (without OpenCV) For grayscale image Read And Display Of Opencv And Python Images And Image Conversion Using, Python Error Reading Back A Numpy Array From Csv Stack Overflow, A Comprehensive And Practical Guide To Image Processing And Computer. Top Python APIs Popular Projects. cv2.imshow () function takes any size of NumPy array and shows the image in the same size in the window. You may also want to check out all available functions/classes of the module cv2 , or try the search function . Japanese girlfriend visiting me in Canada - questions at border control? imread() returns a numpy array containing values that represents pixel level data. 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. When using OpenCV features in Python, we represent images as Numpy arrays. in this video on opencv python tutorial for beginners, i am going to show how to read, write, show images in opencv. OpenCV - numpy array is 'bad argument type' for cv2.imread? Is this an at-all realistic configuration for a DHC-2 Beaver? This article describes the following contents. cv2.imread () method loads an image from the specified file. import cv2 import numpy as np #Created an image (really an ndarray) with three channels new_image = np.ndarray((3, num_rows, num_cols), dtype=int) #Did manipulations for my project where my array values went way over 255 #Eventually returned numbers to between 0 and 255 #Converted the datatype to np.uint8 new_image = new_image.astype(np.uint8) NOTE: It returns an empty matrix ( Mat::data==NULL ) if the image cannot be read because of any reason (like missing file, improper permissions, unsupported or invalid format). - Steven Rumbalski Sep 28, 2011 at 18:33 Add a comment 3 Answers Sorted by: 53 Your code can be fixed as follows: . Read And Display Of Opencv And Python Images And Image Conversion Using We will start to read it using python opencv. do fill this form for feedback: forum open till 23rd november 2017 machinelearning #python #opencv #computervision #numpy what are pixels? What is difference between "cv2.filter2D" vs Keras "Conv2D" function. resize resizes the image src to the size dsize and returns numpy array. Read image using python opencv Import library import cv2 import numpy as np Read image The rubber protection cover does not pass through the hole in the rim. 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. Try to recheck your outputs after each step. cv2.imread () NumPy ndarray Pillow convert ('L') L : PythonPillow (PIL) OpenCV 4.2 OpenCV documentation index YYUVRGB RGBY Reference - What does this error mean in PHP? What's the canonical way to check for type in Python? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What is the use of img_to_array() (from keras.preprocessing.image module) after cv2.imread(), as it is already in numpy array. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Disconnect vertical tab connector from PCB. Most of the colour images are stored in RGB format and here R for red, G for green and B for blue. When the flag is passed with the value cv2.IMREAD_GRAYSCALE then the image is first converted to a single-channel grayscale image and then loaded into the program. It is the default value of the flag parameter. That is, the value range [0,1] is mapped to [0,255]. NOTE: We are using .shape method to access the shape of the image. like the first image). . I'm trying to read an image using cv2.imread(image). 3 import cv2 4 import numpy 5 6 imgarray = yourarrayhere # This would be your image array 7 8 cv2img = cv2.imshow(imgarray) # This work the same as passing an image After that, we have used the numpy function zeros, which gives a new array of 800*800. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? imread () function is used to load the image and it also reads the given image (pil image) in the numpy array format. Note The above method is normally used for selecting a region of an array, say the first 5 rows and last 3 columns. If the image is We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. NumPy matmul Matrix Product of Two Arrays. NumPy gcd Returns the greatest common divisor of two numbers, NumPy amin Return the Minimum of Array Elements using Numpy, NumPy divmod Return the Element-wise Quotient and Remainder, A Complete Guide to NumPy real and NumPy imag, NumPy mod A Complete Guide to the Modulus Operator in Numpy, NumPy angle Returns the angle of a Complex argument. cv2.imencode () function is to convert (encode) the image format into streaming data and assign it to memory cache. There are two ways: one is to use OpenCV function cv2.threshold (), and the other is to process ndarray with a basic operation of NumPy. Why is the eastern United States green if the wind moves from west to east? If the image is this also hello everyone! imshow ('negative', image) cv2. If the image resolution is more than a system screen resolution then it shows only those pixel which fits in the screen. Following are the image formats supported by cv2.imread() method: NOTE: Reading of .JPEG format images depend on the version of OpenCV library installed on the system, platform, or environment (like x86/ARM), etc. The best answers are voted up and rise to the top, Not the answer you're looking for? Convert Numpy Array To Image Opencv . COLOR_BGR2RGB) Then it can be pre-processed as required (resizing, normalization, means subtraction, etc) before being saved into a numpy (.npy) file: np. If you have created an image using numpy array, than no need to read it again, as cv2 accepts a numpy array as an image. Matplotlib imread vs cv2 imread: cvtColor ( img, cv2. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Something can be done or not a fit? The function imwrite saves the image to the specified file. 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. Images are read as NumPy array ndarray. imwrite () is used to save the image in the file. in this exercise we will use our numpy skills to convert numbers into images we will see examples of 2 very useful python in this video you will learn how images are represented in image processing applications and some basic opencv functions like in this video we will learn how to convert images in numpy arrays. resize to a local image file. imread () returns a 2D or 3D matrix based on the number of color channels present in the image. Import Image Data To Numpy Array In Opencv, Matplotlib Plotting Tutorials : 041 : Read, Process, And Manipulate Images With Imread And Imshow, Understanding The Pixels Using Opencv | Machine Learning | Beginner | Python | Image Processing, 05 Nympy | Numerical Python | 3 Dimensional Image Array Manipulation: Ai And Ml Foundations, How To Convert Images To Numpy Arrays 20. Was the ZX Spectrum used for number crunching? Refresh. After which, we have imported the NumPy module. . We bring you the best Tutorial with otosection automotive based. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. PythonOpenCV cv2.imread (), cv2.imwrite () NumPy ndarray ndarray cv2.imread () BGR cv2.imread () cv2.imwrite () cv2.imread () cv2.imwrite () cv2.imdecode () function reads data from specified memory cache and converts (decodes) data into image format; it is mainly used to recover images from network transmission data. . Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? we will loading an image in python as a numpy array using 3 apis 1. pil, pillow, python imaging library 2. opencv(cv2) 3. The cv2 package provides an imread () function to load the image. The only thing we need to convert is the image color from BGR to RGB. pixels are the raw building blocks of an image. Which shows the NumPy array in the form of an Image. And the most important thing is the type of image is not determined by the image file extension but by the content of the numpy.ndarray returned by the cv2.imread() method. The following are 30 code examples of cv2.IMREAD_GRAYSCALE () . param path: the file path of the image :return: the image in RGB format as numpy array of floats normalized to range between 0.0 - 1.0 """ flags = cv2.IMREAD_UNCHANGED+cv2.IMREAD . (filename, cv2. Importing OpenCV to use Python imread () In order to use the Python imread () method, we require the cv2 module of the opencv-python library. To do that, we simply need to . As discussed earlier, the syntax of imread is as follows: matplotlib.pyplot.imread(fname, format=None) The format parameter specifies the image file format that will be assumed for reading the data. So what you need is to divide your img_to_array() output by 256 or convert it to the uint8. In a book, I saw the following code to load images from a directory: It converts image to a numpys array in BGR format. The integer value corresponding to cv2.IMREAD_GRAYSCALE is 0 we can also use 0 in place of cv2.IMREAD_GRAYSCALE. Depends on how you use that, mostly yes if the next question you use requires that format as an input. The following are 30 code examples of cv2.IMREAD_COLOR () . is, the value range [0,255*256] is mapped to [0,255]. This article describes the following contents. waitKey The imshow function opens a screen identified by the title (provided in the first argument) and shows the image (second argument) on that . 16-bit unsigned or 32-bit integer, the pixels are divided by 256. You may also want to check out all available functions/classes of the module cv2 , or try the search function . Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Java; . Refresh the page, check Medium 's site status, or find something interesting to read. What is the use of img_to_array () (from keras.preprocessing.image module) after cv2.imread (), as it is already in numpy array. in this video we will learn how to convert images in numpy arrays! 32-bit or 64-bit floating-point, the pixel values are multiplied by import cv2 import numpy as np from matplotlib import pyplot as plt Let's get started. So simply accessing each and every pixel value and modifying it will be very slow and it is discouraged. Numpy log10 Return the base 10 logarithm of the input array, element-wise. The output tuple has only two values 512 is the number of rows in the sample image, and 512 is the number of columns. cv2.imread () It converts image to a numpys array in BGR format img_to_array () It converts PIL instance to numpy array, but in this case image will stay in BGR format as the image is loaded by cv2. Why its unstable at first, then stepped up after the 75th epoch? Numpy is an optimized library for fast array calculations. Why use two LSTM layers one after another? Irrespective of the input sample image passed to the cv2.imread() method the image will be loaded as a grayscale image when the flag value is either 0 or cv2.IMREAD_GRAYSCALE. To double check, I displayed images before and after applying img_to_array() using cv2.imshow(). That is the reason for such a display. To learn more, see our tips on writing great answers. Central limit theorem replacing radical n with n, confusion between a half wave and a centre tapped full wave rectifier. Webto read an image in python using opencv, use cv2.imread() function. Using Keras API to Convert images to NumPy array Keras API provides the functions for loading, converting, and saving image data. In Python and OpenCV, you can read (load) and write (save) image files with cv2.imread () and cv2.imwrite (). Do non-Segwit nodes reject Segwit transactions with invalid signature? Making statements based on opinion; back them up with references or personal experience. imread ( os. But, if I try to save the images using cv2.imwrite into a file, they both are saved as normal (ie. In this example, we will write a numpy array as image using cv2.imwrite () function. Why is this happening? Help us identify new roles for community members. But it you divide image with 256.0 as follows: You get the original image since imshow() multiplies the float with 256. The image argument which you're passing must be a path to the actual image i.e. Python Pillow Read Image to NumPy Array: A Step Guide Preliminary We will prepare an image which contains alpha chanel. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Here the loaded image has four channels Blue, Green, Red & Transparency as the flag value is cv2.IMREAD_UNCHANGED. rev2022.12.9.43105. What happened to the accuracy before and after 75th epoch. machine learning and data science. Just remember two things you have to pass the full path of the sample image file if you dont have it in your present working directory and you can also pass the integer value [1, 0, & -1] to the flag parameter corresponding to [cv2.IMREAD_COLOR, cv2.IMREAD_GRAYSCALE, & cv2.IMREAD_UNCHANGED]. This numpy.ndarray is a 3-Dimensional array when the loaded image is a colorful image and a 2-Dimensional array when the loaded image is a grayscale image. Please enter your username or email address to reset your password. IMREAD_COLOR) image [xi: xj, yi: yj] = 255-image [xi: xj, yi: yj] cv2. What is the use of applying img_to_array() after cv2.imread(). today is the last video of the numpy series! For that, we have to first install the opencv-python library inside the virtual environment or on the local system and then import the cv2 module in the Python program. # read image as an numpy array image = np.asarray(bytearray(resp.read()), dtype="uint8") # use imdecode function image = cv2.imdecode(image, cv2.IMREAD_COLOR) # display image cv2 . Colour image is a collection of three parallel planes, and every plane represent the colour intensity of a single channel. Why is the federal judiciary of the United States divided into circuits? This numpy.ndarray is a 3-Dimensional array when the loaded image is a colorful image and a 2-Dimensional array when the loaded image is a grayscale image. It only takes a minute to sign up. opencv/opencv, Get and change the current working directory in Python, OpenCV 3.0.0: Image file reading and writing, Reading and Writing Images and Video OpenCV 2.4.13.0 documentation, Check OpenCV Build Information: getBuildInformation(), Alpha blending and masking of images with Python, OpenCV, NumPy, Concatenate images with Python, OpenCV (hconcat, vconcat, np.tile), Detect and read barcodes with OpenCV in Python, Get image size (width, height) with Python, OpenCV, Pillow (PIL), Binarize image with Python, NumPy, OpenCV, Detect and read barcodes and QR codes with ZBar in Python, Detect and read QR codes with OpenCV in Python, Generate QR code image with Python, Pillow, qrcode, Add padding to the image with Python, Pillow, Save frames from video files as still images with OpenCV in Python, NumPy: Arrange ndarray in tiles with np.tile(), JPEG 2000 files - *.jp2 (see the Note section), Portable Network Graphics - *.png (see the Note section), OpenEXR Image files - *.exr (see the Note section), Raster and Vector geospatial data supported by GDAL (see the Note section). The output tuple has three values 512 is the number of rows (height of the image) in the sample image, 512 is the number of columns (width of the image), and 3 is the number of channels. join ( image_dir, image_name )) img = cv2. Thanks for contributing an answer to Stack Overflow! Example #1 Search by Module; Search by Words; Search Projects; Most Popular. Then we have used the imread () function to read our image. Example #1 Following are the commands to install and import it: Following is the proper syntax of Python imread() method: Parameters: cv2.imread() method takes two parameters. Making statements based on opinion; back them up with references or personal experience. It is used to load an image in the Python program from the specified file. But when you use img_to_array() it converts data to the float. imread () returns a numpy array containing values that represents pixel level data. Although it is quite a straightforward function, but cv2 imread has many features that are not commonly known. . #include <opencv2/imgcodecs.hpp> Saves an image to a specified file. If you pass an numpy.ndarray which is already an array of image values, it gives the that TypeError: bad argument type for built-in operation Share Improve this answer Follow answered Oct 19, 2019 at 14:03 Rajath Bharadwaj 11 3 Add a comment Your Answer Post Your Answer The fourth channel that is the transparency or alpha channel will be included if it is there in the sample image. Read And Display Of Opencv And Python Images And Image Conversion Using If he had met some scary fish, he would immediately return to the surface. 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There are functions for rotating or flipping images (= ndarray) in OpenCV and NumPy, either of which can be used. in this lesson, joed goh explain how to use some of the useful functions of numpy library to manipulate numerical data. Find centralized, trusted content and collaborate around the technologies you use most. The image is loaded as a numpy array which can be used for further image processing or transformation operations. The console tells me that my argument - image - is of type , so it should work with cv2.imread(), but i get the following error: 'TypeError: bad argument type for built-in operation'. Syntax: cv2.imread (path, flag) Parameters: path: A string representing the path of the image to be read. Not the answer you're looking for? imwrite () saves the image in the file. The following are 30 code examples of cv2.IMREAD_ANYDEPTH () . Deep learning computer vision images require Keras API. The fourth channel that is the transparency or alpha channel is ignored even if it is there in the sample image. It returns a tuple of the number of rows, columns, and channels. The cv2.imread function accepts a single parameter, the path to where your image lives on your disk: image = cv2.imread ("path/to/image.png") The OpenCV cv2.imread function then returns either of two values: A NumPy array representing the image with the shape (num_rows, num_cols, num_channels), which we'll discuss later in this tutorial . cv2.imread () accepts the path where the actual image is located in your drive. Thanks @Shahriyar, So, img_to_array() is needed to make the array compatible with Keras or I can skip it ? Step 1: Import all the necessary libraries The first step is to import all the required libraries. Webto read an image in python using opencv, use cv2.imread () function. Connecting three parallel LED strips to the same power supply. Books that explain fundamental chess concepts, MOSFET is getting very hot at high frequency PWM, i2c_arm bus initialization and device-tree overlay. python3 import cv2 image = cv2.imread ('sample ') img = cv2.cvtcolor (image, cv2.color bgr2rgb). Also: Thanks for contributing an answer to Data Science Stack Exchange! Should I give a brutally honest feedback on course evaluations? Convert Numpy Array To Image Opencv . I notice that your numpy array is np.uint32. It expects the float values in normalized form, that is all the pixels are divided by 256. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? How to convert a python numpy array to an RGB image with Opencv 2.4? Where is it documented? how to convert numpy array to cv2 image Comment 0 xxxxxxxxxx 1 # cv2 images are already numpy arrays. Ex: Image resolution is (2000,1000) (widht, height) and screen . Using cv2. Counterexamples to differentiation under integral sign, revisited, Concentration bounds for martingales with adaptive Gaussian steps. MathJax reference. How do I access the ith column of a NumPy multidimensional array? If nothing can be deduced, PNG is tried. Example #1 # open image to numpy array and switch to RGB from BGR img = cv2. The integer value corresponding to cv2.IMREAD_UNCHANGED is -1 we can also use -1 in place of cv2.IMREAD_UNCHANGED. import opencv img = cv2.imread("ImagePath") print(img) If we execute the above code, we will get a huge NumPy array. 255. Not otherwise. In this entire tutorial I will use only three python packages one is NumPy, the other is OpenCV and the last is requests. So let's import it. you can read image as a grey scale, color image or image . In general cases, we read image using cv2.imread (), apply some transformations on . save ( 'image.npy', img) i hope you will like the video and subscribe to my in this tutorial, you will learn to import image data to numpy array. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. Ready to optimize your JavaScript with Rust? For a binary or grey scale image, 2D array is sufficient. First, we read the image file using imread() the method from the module cv2. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). Was the ZX Spectrum used for number crunching? Example 2: Save Image using cv2 imwrite () - with Random Values. cv2 numpy 1 matplotlib.pylab import pylab as plt import numpy as np img = plt.imread('examples.png') print(type(img), img.dtype, np.min(img), np.max(img)) [out] (<type 'numpy.ndarray'>, dtype('float32'), 0.0, 1.0) # matplotlibfloat0-1 2 PIL.image.open Example 1: Python3. Python's OpenCV handles images as NumPy array ndarray. Why is the federal judiciary of the United States divided into circuits? So you do not need to convert it. How do I print the full NumPy array, without truncation? You may also want to check out all available functions/classes of the module cv2 , or try the search function . You can also read image files as ndarray with Pillow instead of OpenCV. It is mainly used for compressing image data format . In order to use the Python imread() method, we require the cv2 module of the opencv-python library. The function may scale the image, depending on its depth: To learn more, see our tips on writing great answers. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Create Device Mockups in Browser with DeviceMock, Creating A Local Server From A Public Address, Professional Gaming & Can Build A Career In It. This page shows Python examples of cv2.IMREAD_UNCHANGED. This is because of the data type you provide to the imshow() function. Why does the USA not have a constitutional court? Thus imshow() multiplies it with 256. Why is apparent power not measured in watts? To install it type the below command in the terminal The integer value corresponding to cv2.IMREAD_COLOR is 1. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? What happens if you score more than 99 points in volleyball? imwrite, we are writing the output of cv2. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? 2 # Simply pass it to cv2 as a normal cv2 image. Surface Studio vs iMac Which Should You Pick? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, TypeError: bad argument type for built-in operation using Otsu threshold. Rotate image with OpenCV: cv2.rotate () Flip image with OpenCV: cv2.flip () Rotate image with NumPy: np.rot90 () This may explain OpenCV Error: Image step is wrong () in cvSetData. TypeError: bad argument type for built-in operation, TypeError: bad argument type for cv2.imread() from Raspberry Pi Camera on Jetson Nano. Why is using "forin" for array iteration a bad idea? Output Image cv2.resize () preserving aspect ratio Example 2: cv2 Resize Image Horizontally In the following example, we will scale the image only along x-axis or Horizontal axis. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You don't need to convert NumPy array to Mat because OpenCV cv2 module can accept NumPy array. 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