Category: Text extraction from image using opencv python

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Text extraction from image using opencv python

14.01.2021 Text extraction from image using opencv python

Get the latest tutorials on SysAdmin and open source topics. Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city. Become an author. Images make up a large amount of the data that gets generated each day, which makes the ability to process these images important. One method of processing images is via face detection.

Face detection is a branch of image processing that uses machine learning to detect faces in images. A Haar Cascade is an object detection method used to locate an object of interest in images. The algorithm is trained on a large number of positive and negative samples, where positive samples are images that contain the object of interest. Negative samples are images that may contain anything but the desired object.

Once trained, the classifier can then locate the object of interest in any new images. In this tutorial, you will use a pre-trained Haar Cascade model from OpenCV and Python to detect and extract faces from an image. OpenCV is an open-source programming library that is used to process images.

Before you begin writing your code, you will first create a workspace to hold the code and install a few dependencies. Next, you will create a virtual environment for this project.

text extraction from image using opencv python

This file indicates the necessary Python dependencies:. Install the dependencies by passing the requirements. The -r flag specifies the location of requirements. In this step, you set up a virtual environment for your project and installed the necessary dependencies.

In this new file, start writing your code by first importing the necessary libraries.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. We observe that for clean inputs the accuracy is high. See input 2. Noisy input may not have the same effect! Credit: Base code has been taken from Tram Vo Minh's blog.

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And modifications have been performed on that! Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Python Branch: master. Find file.

Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 8f2a0ec Dec 1, NLP-image-to-text Code to extract text from images pip install -r requirements.

You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Initial commit. Nov 20, Dec 1, Nov 22, It is capable of 1 running at near real-time at 13 FPS on p images and 2 obtains state-of-the-art text detection accuracy. To discover how to apply text detection with OpenCV, just keep reading!

Detecting text in constrained, controlled environments can typically be accomplished by using heuristic-based approaches, such as exploiting gradient information or the fact that text is typically grouped into paragraphs and characters appear on a straight line.

Natural scene text detection is different though — and much more challenging. Due to the proliferation of cheap digital cameras, and not to mention the fact that nearly every smartphone now has a camera, we need to be highly concerned with the conditions the image was captured under — and furthermore, what assumptions we can and cannot make.

With the release of OpenCV 3. The EAST pipeline is capable of predicting words and lines of text at arbitrary orientations on p images, and furthermore, can run at 13 FPS, according to the authors.

Perhaps most importantly, since the deep learning model is end-to-end, it is possible to sidestep computationally expensive sub-algorithms that other text detectors typically apply, including candidate aggregation and word partitioning.

To build and train such a deep learning model, the EAST method utilizes novel, carefully designed loss functions. For more details on EAST, including architecture design and training methods, be sure to refer to the publication by the authors. You may wish to add your own images collected with your smartphone or ones you find online.

If you have any improvements to the method please do feel free to share them in the comments below. Before we get started, I want to point out that you will need at least OpenCV 3. To begin, we import our required packages and modules on Lines In order to perform text detection using OpenCV and the EAST deep learning model, we need to extract the output feature maps of two layers:.

We load the neural network into memory using cv2.

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We need to filter out weak text detections by ignoring areas that do not have sufficiently high probability Lines 82 and The EAST text detector naturally reduces volume size as the image passes through the network — our volume size is actually 4x smaller than our input image so we multiply by four to bring the coordinates back into respect of our original image.

The final step is to apply non-maxima suppression to our bounding boxes to suppress weak overlapping bounding boxes and then display the resulting text predictions:. As I mentioned in the previous section, I could not use the non-maxima suppression in my OpenCV 4 install cv2. This scene contains a Spanish stop sign. As you can tell, EAST is quite accurate and relatively fast taking approximately 0.

We begin by importing our packages. Everything else is the same as in the previous section. This function is used to extract:. Our command line arguments are parsed on Lines From what I see, the best approach would be to detect the edges of the licence and crop it.

Then, when you have the coordinates of the edges, you can calculate the angle from which you have to rotate the image for it to be flat. From there, you can crop out fixed areas on predefined pixels coordinates. In thet step, leave a little room for an error let's say you add pixels to each side of the cropping area as an insurance.

Then, you can feed the images to the Tesseract with option --psm 9. That will read the text in the box more accurate than default setting. I have the below image of a single drivers license, I want to extract information about the drivers license, name, DOB etc.

My thought process is to find a way to group them line by line, and crop out the single rectangle that contains name, license, etc for eng and ara.

But I have failed woefully.

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But below is what I want to achieve, for all input license. Approach 1. As mentioned in comments, you can crop the eagle symbol on the top-left and the flag on the top-right, use these as templates and find the two boxes you are interested in, left bottom small box and the center big box with respect to the position of the found templates. As a start, you can use this:. You can use the centers of the found templates to get the relative position of the required boxes small and big. Approach 2.

Similar to what you did based on contours, the basic idea is to use morphology to get definitive lines in the bigger box. So, this approach is pretty straight forward and I am sure you can do the rest in finding the smaller subsets from the large box. If not, shoot me a comment and I'll be happy to help basically crop that area from the image, use HoughlinesP and you should be fine.

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Or, I can see that the smaller subsets are of equal width so you can just crop them based on y coordinates. Hopefully the "bigger", "smaller" boxes are well understood, apologies for my laziness in not showing what they are in images.

Note : Given only one image, I can't say for sure if it works for all the images in your dataset. If you can upload more images, I can try them on. Courtesy: OpenCV shape detection for detecting shapes in contours. Opencv: Crop out text areas from license 2 From what I see, the best approach would be to detect the edges of the licence and crop it.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Image to Text with Python - pytesseract

I want to extract text from a specific area of the image like the name and ID number from identity card. I have tried this code but it just extracts the address and date of birth which I don't need. I just need the name and ID number. I have also attached the image from which I am trying to extract text. I have tried according to my knowledge but not succeeded. I can suggest a pre-processing step prior to finding textual information.

OpenCV Text Detection (EAST text detector)

The code is simple to comprehend. Learn more. Asked 1 year, 9 months ago. Active 9 months ago. Viewed 4k times. Tehseen Tehseen 75 1 1 silver badge 10 10 bronze badges. Are you getting? Show us the error instead. If you don't have any idea how to proceed for the problem look for another tutorials. Tehseen Can you attach the binary image as well? If there is any information loss in binary image itself, then it wont recognize the characters.

Active Oldest Votes. Jeru Luke Jeru Luke Tehseen I think you have tweak the dilation parameters a bit more, like the type of kernel used and the size of the kernel. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

text extraction from image using opencv python

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Text Detection and Extraction using OpenCV and OCR

Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Triage needs to be fixed urgently, and users need to be notified upon….OpenCV Open source computer vision is a library of programming functions mainly aimed at real-time computer vision. OpenCV in python helps to process an image and apply various functions like resizing image, pixel manipulations, object detection, etc.

In this article, we will learn how to use contours to detect the text in an image and save it to a text file. OpenCV package is used to read an image and perform certain image processing techniques. Download the tesseract executable file from this link. Approach: After the necessary imports, a sample image is read using the imread function of opencv. The colorspace of the image is first changed and stored in a variable. For color conversion we use the function cv2.

The second parameter flag determines the type of conversion. We can chose among cv2. Here, we use cv2. A threshold is applied to the coverted image using cv2. For more information on thresholding, refer Thresholding techniques using OpenCV. Here, we use the rectangular structural element cv2. A bigger kernel would make group larger blocks of texts together.

After choosing the correct kernel, dilation is applied to the image with cv2. Dilation makes the groups of text to be detected more accurately since it dilates expands a text block. There are three arguments in cv. This function returns contours and hierarchy. Contours is a python list of all the contours in the image. Each contour is a Numpy array of x, y coordinates of boundary points in the object.

Contours are typically used to find a white object from a black background.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. We observe that for clean inputs the accuracy is high. See input 2. Noisy input may not have the same effect!

Credit: Base code has been taken from Tram Vo Minh's blog. And modifications have been performed on that! Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Python Branch: master. Find file. Sign in Sign up. Go back.

Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 8f2a0ec Dec 1, NLP-image-to-text Code to extract text from images pip install -r requirements.

text extraction from image using opencv python

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