Application To Get An Empty Number – I’m relatively new to image processing and I’m faced with this problem: Suppose I have an image of an application form, like this:
Now I would like to find the location of all the places where data is to be entered. In this case, the rectangles will be divided into a series of boxes like this (not all fields are marked):
Application To Get An Empty Number
I can also live with photo frame detection. I tried running the square.cpp example in the OpenCV sources, but I didn’t get what I wanted. I also tried the modified version here; The results were worse (my use case is certainly very different from the OP’s on that question).
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Also, the Hough transform to get the lines doesn’t really work with/without blur thresholding because noise in the scanned image contributes to extraneous lines and thresholding also removes parts of the combs (small sections) and Hence, detects the blurred line. Is not equal.
Note that this form is not a scanned copy of the printed form, but may be a noisy scanned image of the actual input printed form.
Although I’m pretty sure it’s possible (at least with some tolerances allowed) and I’m trying to find a solution, it would be very helpful if you had some ideas from other people who have tried something similar. is of. Enjoy solving CV problems. Also, it would be great if answers explained why a particular operation was performed (e.g. dilation to attempt to fill holes left by the threshold, etc.)
Are the modules compatible in any way? Are the sizes of “such boxes” the same in all forms? If you can rely on a consistent size, such as the font box in the form above, you can use pattern matching.
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Otherwise the problem seems to be: find some/all rectangles in the image (with a post-processing step to filter out rectangles that have a significant number of marks inside or merge neighboring rectangles).
The more you can take advantage of the coherence between modules, the simpler the problem will be. Use whatever references you can find.
By using gradients (calculated using Sobel kernels in the x and y directions) you can remove most of the noise.
Using both you can find the direction of the gradients (the equation can be found here: en.wikipedia.org/wiki/Sobel_operator). Suppose we define a differentiating feature of a frame as vertical or horizontal gradient. If the pixel gradient has a straight horizontal or vertical orientation, keep it and set everything else to white.
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To make it more resistant to noise, you can use a sliding window (3×3) where you calculate the mean orientation. If the mean (or mean) orientation of the window is portrait or landscape, keep the current pixel (at the center of the window); Otherwise set it to white.
You can use OpenCV for gradient calculation and possibly orientation/phase calculation, but you’ll probably need to write code to code the actual sliding window. I am not very familiar with OpenCV
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There are a large number of classes in the .NET library. Classes are created in different namespaces. To use a class, first identify the class you want, and then find out in which namespace the class exists. As seen in our introduction to namespaces, at the top of the document, type the USING keyword after the namespace name to indicate that you want to use a class that exists in the namespace.
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The left frame shows a list of libraries. To display the classes of a certain namespace, you need to expand it, which is done by clicking the left triangle button. Click on a node of a class to see a list of its members:
To view a class’s members (properties, methods, etc.), click on its node in the left frame. The central list will then display the members. Here’s an example:
The most fundamental namespace in .NET is called System. Contains the main data types used in an application. It also contains classes used in common applications.
You’ll need a System namespace for whatever application you’re building. The primary way to use the system namespace in an application is to write the use keyword after system;. Here’s an example:
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The .NET library is huge. It contains a variety of objects that you can use for your applications; But there are also extreme cases where some features are not available. In that case, you can “borrow” functionality from other external sources. One of the external sources you can use is a library called Win32. One of the resources provided by an external library like Win32 is functions.
The C# language has a small library made up of a few classes that you will rarely use. The library is called Microsoft.CSharp.dll. If you create a console application, Microsoft Visual Studio automatically adds the Microsoft.CSharp.dll library to your project. Otherwise, if you create an empty project but want to use this library, you can easily add it using the Reference Manager dialog.
A data type tells the compiler how much memory to reserve for a variable. In
