Opencv Imwrite Not Working

below graph is using opencv and python to process image in Chinese filename/path with imread(),and show the image in Chinese title with imshow() as you can see,Chinese path/filename/string cannot work with imread()/imshow() in opencv and this situation slao happens in imwrite(). dll file is that somehow VideoWriter outputVideo is not able to open up. You could convert your image before using videoWriter. Sure we were lazy. Alright, so my post Getting Webcam Images with Python and OpenCV 2 was wrong! I did not fully understand how to read the OpenCV API documentation and instead of demonstrating how to capture an image with OpenCV 2, I just demonstrated a way to capture an image with OpenCV 1. Note, the reason we do not simply rely on opencv directly is that there is a known existing bug in opencv with RTSP streams that makes them unreliable. below graph is using opencv and python to process image in Chinese filename/path with imread(),and show the image in Chinese title with imshow() as you can see,Chinese path/filename/string cannot work with imread()/imshow() in opencv and this situation slao happens in imwrite(). [Meta] - For posts about /r/opencv; Rules: Don't be an asshole. But the required output is like the curve the program is working , but the curves are not drawing on my screen like below , how to draw them using opencv or other approach So that these lines can play the role of their specific colour in image and with their values , like below right one is the orignal image and left one is the result of. Also, this isn't the bare minimum…I'm not sure what dev tools or which cmake flags are are absolutely needed, or if qt-sdk is needed if you don't build with Qt support. tried various combinations of encoder parameters. OpenCV stands for the Open Source Computer Vision Library. png','bitdepth',16) Of course, not all image. Using OpenCV with Eclipse CDT Eclipse is a cross-platform Integrated Development Environment (IDE). For this purpose, there are special constructors taking pointers to CvMat or IplImage and the optional flag indicating whether to copy the data or not. bool check = imwrite(". cpp that demonstrates the usage of different. Changing the filename to img. Download with Google Download with Facebook or download with email. So if 26 weeks out of the last 52 had non-zero commits and the rest had zero commits, the score would be 50%. CMake configuration goes right, until it fails searching for libnvcuvid. waitKey(0) should wait for a key stroke, however, in my case, it waits indefinitely even though I press some keys. Starting from version 2. The insertText function does not work for certain composite characters. opencv在开发win32平台开发视频应用时,可以用cvCaptureFromAVI方便提取中视频的信息但是在Android中虽然有这个函数,但是用不了,根本不能用,google了好久才在openc 博文 来自: Do not mess it up. 4 OpenCV includes desktop Java bindings. android android/package/res/ android/package/res/drawable/ android/package/res/drawable/icon. I think that your intersting problme is tracking topic. Learn more about image processing, digital image processing. OpenCV for Unity based on OpenCV2. mat − A Mat object representing the image to be written. Equipment used. You’ll also apply the following concepts as you build a computer-vision application: Ordinary least squares as a regression and classification technique. Also I have to write these instructions anyway for our project. Also, this isn't the bare minimum…I'm not sure what dev tools or which cmake flags are are absolutely needed, or if qt-sdk is needed if you don't build with Qt support. Only 8-bit (or 16-bit in the case of PNG, JPEG 2000 and TIFF) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function. Is there a better way to rewrite this part in python. Though it is a work around, worked for Ideapad520 GeForceMX150 lenovo laptop. I am working with opencv and c++ to watermark a video but the problem is that when I write the video. The operators do NOT copy the data. bool imwrite ( const String But most of the codecs listed in this page might not work in. Updating it to. CV_8UC3 did not work for me, CV_8UC4 works for me. js bindings to OpenCV 3 and OpenCV 4 opencv4nodejs allows you to use the native OpenCV library in Nodejs. I didn’t went into each person but rather saved the “thumbnails”. com/profile/10009716708452214863 [email protected] Ask Question Changed file extension to. bmp and it magically started working. jsをブラウザで使う分には、imreadやimwrite face tracker sample not working: libopencv_java3. opencv在开发win32平台开发视频应用时,可以用cvCaptureFromAVI方便提取中视频的信息但是在Android中虽然有这个函数,但是用不了,根本不能用,google了好久才在openc 博文 来自: Do not mess it up. The first. à l'aide vs2015 + OpenCV 2. org for their explanations. [Meta] - For posts about /r/opencv; Rules: Don't be an asshole. py by downloading the source code: #import all the necessary packages import numpy as np import cv2 def order. Not only opencv is used in python script but also numpy is used. How can ı use gstream with OpenCV. I want to process different type of image to extract actual text from noisy image. The OpenCV Tutorials. I'm trying to get face detection working using the detectMultiScale API of JavaCV, but I can't seem to get it to work and I'm at a loss as to why. Also as it's mentioned in some of the comments above glob does not work well in Ubuntu, I verified the data after sorting it is same as you mentioned "contempt" (18), "fear" (25) and "sadness" (28). imshow() will not work (not compiled with GTK+ 2. The project in this tip is how to capture video from webcam. The project in this, how to use OpenCV with Java under Eclipse IDE platform. Tried the Transparent API also, works well on Facemark. Saving Multiple Blocks of an image. Under Linux we have to build OpenCV from source manually or using the auto build script. If you have previous/other manually installed (= not installed via pip) version of OpenCV installed (e. if your current working directory is set to (say) /project1, save both the test script and the (input and output) video files in this directory. The ultimate goal of this project is to provide a comprehensive collection of nodejs bindings to the API of OpenCV and the OpenCV-contrib modules. I want to process different type of image to extract actual text from noisy image. In fact, since OpenCV already has an implementation of the Not function and performance-wise it is better than the generic version of the equivalent Convert function call. The project in this tip is how to capture video from webcam. 4 on Ubuntu 12. I saw the comments here a few days ago and came back to read them while I was working with an Edison tonight, but they seem to have disappeared. the opencv site details is bit confusing about using visual studio. Unofficial pre-built OpenCV packages for Python. imwrite() not saving image. tried various combinations of encoder parameters. You can vote up the examples you like or vote down the ones you don't like. I didn’t went into each person but rather saved the “thumbnails”. The code is quite self explanatory, do post questions if any. Note: Only a few of the FourCC codes listed above will work on your system based on the availability of the codecs on your system. This page covers installing OpenCV 3 on Windows (using pre-built binaries) and Linux (compiled from source), including the Python interface (the cv2 module). this answer answered Mar 19 '16 at 7:22 hyde 24. Also, this isn't the bare minimum…I'm not sure what dev tools or which cmake flags are are absolutely needed, or if qt-sdk is needed if you don't build with Qt support. Imageio is a Python library that provides an easy interface to read and write a wide range of image data, including animated images, volumetric data, and scientific formats. The below steps for using Android OpenCV sdk in Android Studio. Let's see how to do it with OpenCV. It contains a large collection of image processing functions. OpenCV is used for all sorts of image and video analysis, like facial recognition and detection, license plate reading, photo editing, advanced robotic vision. VideoPlayAndSave. This is a simplified version of this(1) SO answer. problem with imread() in Python. If we use SURF or SIFT, the result will be more robust, but much time consuming. There were some good ones that explained how to get this to work, since the code included in this online article (and in the printed version of this article) does not work. Dear QT an OpenCV users, I have installed with CMake actual OpenCV 3. the opencv site details is bit confusing about using visual studio. Imwrite PAM specific tupletype flags used to define the 'TUPETYPE' field of a PAM file. imwrite() which i am obtaining after gabor filter. It was founded at Intel in 1999, went through some lean years after the. but these did not work. bmp and it magically started working. Those who want to have a youtube video for same, try with the latest version of opencv though(3. > Basically, you get what you see in depth image display window and this > works fine for me. OpenCV imwrite() not saving image. I have added the compile output. Tesseract-OCR Based Automatic NPR System on Raspberry Pi (IJSRD/Vol. New OpenCV functions which are not found earlier are explained here. write() supports only 8bit images. For multiframe GIF files, A can be an m -by- n -by-1-by- p array containing grayscale or indexed images, where p is the number of frames to write. For example, you cannot insert text when the rendering of one glyph corresponding to a character code influences the position, shape, or size of the adjacent glyph. waitKey(1000) it waits for 1 s and return -1 whether I press a key or not. Also, check your current working directory. Which of the option is correct. imread) 画像の読み込みに失敗する場合 画像を書き込む。. Ipython cv2. Why does openCV image stitching work for images loaded in project but not dynamically loaded images ios,image,opencv,image-stitching,opencv-stitching I have an application that stitches images using openCV and I save the images to my camera roll and to a location in the file system. Import OpenCV to Android Studio, From File -> New -> Import Module, choose sdk/java folder in the unzipped opencv archive. The OpenCV Reference Manual Release. In this tutorial, you will be shown how to create your very own Haar Cascades, so you can track any object you want. x in a way different from the example I…. Import OpenCV to Android Studio, From File -> New -> Import Module, choose sdk/java folder in the unzipped opencv archive. It is simple video capture application using Windows form with VC++. I've put the code for the project on Github as it's now starting to get interesting. Cuda with opencv working fine now. Imwrite PAM specific tupletype flags used to define the 'TUPETYPE' field of a PAM file. For example, you cannot insert text when the rendering of one glyph corresponding to a character code influences the position, shape, or size of the adjacent glyph. The code successfully compiles but it does not save the image. 1 8MP Raspberry Pi, but to begin, the value for money is unbeatable. waitKey(0) should wait for a key stroke, however, in my case, it waits indefinitely even though I press some keys. My intention with this tutorial is to help you get started writing videos to file with OpenCV 3, provide (and explain) some boilerplate code, and detail how I got video writing to work on my. android android/package/res/ android/package/res/drawable/ android/package/res/drawable/icon. The following are code examples for showing how to use cv2. For very rapidly-changing scenes this may not work well, but in the general case (where one frame looks much like the previous one) it should be fine. In the first part of this blog post I'll discuss exactly what NoneType errors are in the Python programming language. Commit Score: This score is calculated by counting number of weeks with non-zero commits in the last 1 year period. So for the python 3 and openCV 3 version of the code in order to make the img work with tesseract you'd need to add an around 20px white boarder to extend the image for somereason (I assume it's because the convolutional matrix scanning effort) according to my other post:. It is convenient and efficient to develop code on an IDE instead of with a simple editor. You’ll also apply the following concepts as you build a computer-vision application: Ordinary least squares as a regression and classification technique. org/quickstart. I added two screenshots for the visual aspect of my problem. RIP F28 NO NIGGA LEFT BEHIND I am the best hacker on these forums. but these did not work. Learn more about imwrite, file, export. Note: Only a few of the FourCC codes listed above will work on your system based on the availability of the codecs on your system. NOTE: I MADE THIS PROJECT FOR SENSOR CONTEST AND I USED CAMERA AS A SENSOR TO TRACK AND RECOGNITION FACES. imwrite("testout. I've put the code for the project on Github as it's now starting to get interesting. Most of the credit goes to Kiran, Kool, 1″, and SteveLiles over at opencv. com/profile/10009716708452214863 [email protected] However this approach did not work either, for some reason I am capturing the last frame in the video. # 💜 Binaries. OpenCV is not the only way to display images with Python. I am using background subtraction method to detect moving objects and thus drawing counters. jp2", test) Upscaling the logo. Sure we were lazy. You can vote up the examples you like or vote down the ones you don't like. Download with Google Download with Facebook or download with email. Changing the filename to img. Ask Question Changed file extension to. imwrite(filename, mat) This method accepts the following parameters − filename − A String variable representing the path where to save the file. Read about 'Dragonboard 410c - OpenCV' on element14. For very rapidly-changing scenes this may not work well, but in the general case (where one frame looks much like the previous one) it should be fine. It was a great help in my studying OpenCV. Since the python script is executed well in python, we consider not to move the part of opencv from the python script to C++ domain. This library is responsible for actually capturing our screenshots to disk or directly to memory. bool check = imwrite(". Lastly, merge the warped image. 9), built cv2. org/quickstart. JPEG 2000 compression for 16 bit images does not work for me. thanks for the helpful code. In the method described by Viola and Jones and implemented in the OpenCV face detection algorithm, Haar like features are extracted in an efficient way by constructiong a summation area table (SAT. On MacOSX, there is also an option to use native MacOSX image readers. This will help developers who love Java and OpenCV environment. By default, the undistortion functions in OpenCV (see initUndistortRectifyMap(), undistort()) do not move the principal point. SIZE_MAX not declared when trying to build opencv-2. How to save a matix as an image? imwrite converts indexed images to RGB before writing data to JPEG files, because the JPEG format does not support indexed images. I've spend a few days exploring Python and OpenCV. The steps in this section prepare a project for working with Cloud Dataproc. write() supports only 8bit images. c++,opencv I am working on Traffic Surveillance System an OpenCv project, I need to detect moving cars and people. The code successfully compiles but it does not save the image. below graph is using opencv and python to process image in Chinese filename/path with imread(),and show the image in Chinese title with imshow() as you can see,Chinese path/filename/string cannot work with imread()/imshow() in opencv and this situation slao happens in imwrite(). The following are code examples for showing how to use cv2. The OpenCV Tutorials. I checked the written image with a TIFF tag viewer (Aware Systems TIFF Tag viewer) and with Windows' own file examiner and I see the DPIs I set. It does not detect any key stroke at all. However, there comes to cases when generic functions provide the flexibility with only minor. That said, you can try the seeking functionality OpenCV provides (see OpenCV Seek Function/Rewind). Cuda with opencv working fine now. For very rapidly-changing scenes this may not work well, but in the general case (where one frame looks much like the previous one) it should be fine. c can be a single color format string, or a sequence of color specifications of length How to find HSV values to track?¶ This is a. 11 to build Java bindings and use it with HIPI to run image processing. In many real world computer vision applications, it is required to persist images and videos for future reference. COLOR_BGR2RGB(). imshow() will not work (not compiled with GTK+ 2. // C++ code:. Googling, found that RDP has various options - taking sound to remote client, leaving the sound on local machine, or no sound at all. read() image is a which I can convert to a JPEG file, like this: cv2. tiff image that's in the opencv_extra repo's test data folder. The behavior we reliably saw by using opencv directly was that the stream would open, obtain between 10 and 15 frames and then stop collecting any new frames. This will help developers who love Java and OpenCV environment. This project is made in OpenCV and Eclipse IDE. You can vote up the examples you like or vote down the ones you don't like. 1的Android Studio 1. This project is made in OpenCV and Eclipse IDE. I am trying to grab the images using the sample code given and show it using Opencv Highgui library. Furthermore it seems that it is not suitable for video that moves rounds an object. I'm working on my first test project with OpenCV, using the Android JNI this time (no longer a problem now that my old windows laptop is history, and my new Mac Mini has replaced it and my even older. If they are small (< 10), the filter will not have much effect, whereas if they are large (> 150), they will have a very strong effect, making the image look "cartoonish". I am using background subtraction method to detect moving objects and thus drawing counters. js bindings to OpenCV 3 and OpenCV 4 opencv4nodejs allows you to use the native OpenCV library in Nodejs. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python. You can vote up the examples you like or vote down the ones you don't like. 0-beta It should also write the following image to faceDetection. On MacOSX, there is also an option to use native MacOSX image readers. My intention with this tutorial is to help you get started writing videos to file with OpenCV 3, provide (and explain) some boilerplate code, and detail how I got video writing to work on my. If you don't already have a Google Account (Gmail or Google Apps), you must create one. On Linux*, BSD flavors and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with an OS image. My first guess is you're hitting WindowsRT sandbox barriers when using imread/imwrite, this is as much as you can do from within opencv. But this not fix it at FaceTracker Sample. This project demonstrate, Configuration VC++ for Opencv as well as create windows form application. it works if they are displayed in different windows but it does not work to be displayed in the. > Basically, you get what you see in depth image display window and this > works fine for me. i I can publish and subscribe but imwrite is not working. imwrite plots not saving. If you do not want to set up OpenCV on your own you can simply let this package auto install OpenCV 3. However this approach did not work either, for some reason I am capturing the last frame in the video. This project demonstrate the Visual C++ Configuration. メモリバッファ(StringIO)から、またはopencv pythonライブラリを使用してURLから画像を読み取る方法; OpenCV Pythonを使って画像の輪郭を表示する方法を教えてください。 opencv Pythonを使って画像の背景を削除する; Pythonでopencvを使って画像からビデオを作成する. 介绍读写视频之前,首先要明确编解码器codec的概念。如果是图像文件我们可以通过文件扩展名得知图像的格式,但是视频文件并不适用,在opencv中,都是avi视频文件,有些能用opencv打开,有些则不 博文 来自: weixin_42638401的博客. JPEG 2000 compression for 16 bit images does not work for me. Cuda with opencv working fine now. Thanks for you work so far on it! I think I may have figured it out. One nice thing that can be done with the latest technology is a really powerful image analysis. dll file is that somehow VideoWriter outputVideo is not able to open up. This system has many independent parts which are developed as big monolithic application (war file), every time there is a change, whole application has to be built deployed making the deployment process very hard and expensive. This project is made in OpenCV and Eclipse IDE. x or Carbon support) 嘗試了各種 OpenCV的安裝方法,OpenCV在 MacOS上總會碰上不少挫折。. Hi I have downloaded opencv and extracted it in a folder. I've spend a few days exploring Python and OpenCV. So color images will not be displayed correctly in Matplotlib if image is read with OpenCV. pyd, but i can't imread ( result always None) or imwrite ( "could not find a writer for the specified extension" ) checked the pyd with dependancy walker, it's using the same dlls as my c++ code does (no problem there, png, jpg support built in ) other stuff in python seems to work well, e. Notice: the total frame count of video captured by opencv often is not correct. Dear Sir, Please help in saving blocks of an image in this code after dividing the image in different folder. Often there would be a need to read images and display them if required. As I mentioned before, I am not using openCV, > so I am not sure how to do this in OpenCV. Hi I have downloaded opencv and extracted it in a folder. Since the OS has a minimum time between switching threads, the function will not wait exactly delay ms, it will wait at least delay ms, depending on what else is running on your computer at that time. MaOFind MiiProject and OpenCVTutorial01. png','bitdepth',16) Of course, not all image formats support all bitdepths, so make sure you are choosing the the right format for your data. 0 where camera release function perfectly but after upgrading to opencv 3. For example, the matrix B initialization above is compiled because OpenCV defines the proper specialized template class DataType >. Introduction to Java Development 47 The OpenCV Tutorials, Release 3. {CV_IMWRITE. The image format is chosen based on the filename extension, see imread for the list of extensions. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python. Cuda with opencv working fine now. The guts of my code is below. 7 13 April, 2019. The idea that came to me is: Read the image and convert it to gray-scale. I dont think the code is the problem here, because viewing IR data is not working at all in NiViewer. thanks for the helpful code. This is probably the reason why you're not seeing the right results. bust but is now under active development, now receiving ongoing support from Willow Garage. Let me describe it: -1)at best, it gives a picture in which exactly the first 2/3 part (firs 320 pixel rows) is a mess (although this mess resemles a bit the. I have been using OpenCV for a few years on Windows, and want to use it on the Beaglebone black along with an Xtion pro live depth camera. Save Images & Videos to File In many real world computer vision applications, it is required to persist images and videos for future reference. There are many FOURCC codes available, but in this post, we will work only with MJPG. txt) or read online for free. What is the major difference between image processing using MATLAB and OPENCV? OpenCV is a programming language used in digital image processing and computer vision. The project in this tip is how to capture video from webcam. 1的Android Studio 1. The OpenCV Tutorials. 04; osx - OpenCV- Webcam frame not working on macbook in Java; opencv - Determine skeleton joints with a webcam (not Kinect) c++ - OpenCV - Webcam does not work. i I can publish and subscribe but imwrite is not working. 7 13 April, 2019. If there is a YUYV format save in a 8UC4 OpenCV Mat, RGBA-to-RGB transform should cut the V channel, so the saved image's color is not correct. Apply the bitwise_not() function from OpenCV to separate the background from the foreground. We are going to use OpenCV function GaussianBlur to apply Gaussian filter to images. so not found - OpenCV Q&A Forum. I am not getting why the same code with same data set is giving me different results. pdf instead of paper. This project tries to solve the problem of processing big data of images on Apache Hadoop using Hadoop Image Processing Interface (HIPI) for storing and efficient distributed processing, combined with OpenCV, an open source library of rich image processing algorithms. Oct 10, 2017 · Opencv doesn't seem to support saving BMP files check the imwrite docs. Furthermore it seems that it is not suitable for video that moves rounds an object. pdf), Text File (. This project demonstrate, Configuration VC++ for Opencv as well as create windows form application. Face Detection+recognition: This is a simple example of running face detection and recognition with OpenCV from a camera. OpenCV on Wheels. As I mentioned before, I am not using openCV, > so I am not sure how to do this in OpenCV. 0 cloud computer vision Computer vision business Visual Studio 2015 Computer. Also as it’s mentioned in some of the comments above glob does not work well in Ubuntu, I verified the data after sorting it is same as you mentioned “contempt” (18), “fear” (25) and “sadness” (28). I've installed opencv on my mac via conda. I tried it, but it did not work correctly and it has a strange behaviour. Example code. Gaussian filter reduces the noise in the image and makes it look better (or higher resolution). It does not detect any key stroke at all. cpp:37: error: missing template arguments before 'keypoints1' Reply. {CV_IMWRITE. Here is the simplified version of cpp-example-starter_video, with everything but the libs / includes. We're currently using OpenCV for photo capture in OS X as well, though it doesn't seem to work as well as in Windows, so we're looking for alternative tools we can use to capture photos from within the script. Java OpenCV Webcam use Imgcodecs. and one last thing, I use OpenCV with QtCreator. Most of the credit goes to Kiran, Kool, 1″, and SteveLiles over at opencv. You can use the bitdepth parameter to set that. The guts of my code is below. c can be a single color format string, or a sequence of color specifications of length How to find HSV values to track?¶ This is a. 0 to get the correct disparity. History Alexander Shishkov on 2012-02-12 20:47. • OpenCV was designed for computational efficiency and with a strong focus on real-time applications. my first go at the python api (on win, 2. In all the examples below, make sure you use the right namespace for C++ and import OpenCV for Python. OpenCV on Wheels. / in windows is not valid, this is used in unix systems to represent the current working directory see Windows current directory. imwrite() not saving image. If you need further clarifications of any OpenCV functions which are not explained here, please refer to Read & Display Image lesson. We will use version 2. 9k 9 66 108 Normal slash did not work. if you are using windows then go command prompt and type:- > pip install cv2 if it is not working then type :- pip install matplotlib See I have just downloaded opencv2. remove(frame_filename) success,image = vidcap. The following are code examples for showing how to use cv2. For this purpose, there are special constructors taking pointers to CvMat or IplImage and the optional flag indicating whether to copy the data or not. There are many FOURCC codes available, but in this post, we will work only with MJPG. If you want to report a bug: Image_acquisition_package#Reporting_bugs image-acquisition will not work on Windows as far as there is not port of v4l2 (standing for Video for Linux 2 ) Contents. Apply the bitwise_not() function from OpenCV to separate the background from the foreground. OpenCV imwrite() not saving image. Tried bringing sound to local device, but that did not work for DirectSound, since I'm on Linux Mint. removed: android/README. png','bitdepth',16) Of course, not all image formats support all bitdepths, so make sure you are choosing the the right format for your data. this answer answered Mar 19 '16 at 7:22 hyde 24. Also as it's mentioned in some of the comments above glob does not work well in Ubuntu, I verified the data after sorting it is same as you mentioned "contempt" (18), "fear" (25) and "sadness" (28). Everything works fine when the video frame is stored on filesystem: vidcap = cv2. External Webcam not working for Opencv and Python; Python/OpenCV capture image from webcam not working; Webcam not working with python interface to OpenCV 2. I have been using OpenCV for a few years on Windows, and want to use it on the Beaglebone black along with an Xtion pro live depth camera. The behavior we reliably saw by using opencv directly was that the stream would open, obtain between 10 and 15 frames and then stop collecting any new frames. I am working with opencv and c++ to watermark a video but the problem is that when I write the video. I don't really know if this issue is from OpenCV for Unity or from Unity's Video Player (I have noticed that VideoPlayer. JPEG 2000 compression for 16 bit images does not work for me. this function is saving a. At first glance it wouldn't seems to be a big gain when using generic operations. The only issue that found in the ready build. Install the relevant packages (do not forget the development files, for example, "libjpeg-dev", in Debian* and Ubuntu*) to get the codec support or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake. png','bitdepth',16) Of course, not all image formats support all bitdepths, so make sure you are choosing the the right format for your data. The Gotchas:. The following are code examples for showing how to use cv2. (I used cv::imwrite("test.