Can Pixel Value Be 0 Cv Mat C

Pixel access for cv mat in case cheat sheet is not clear enough.

Can pixel value be 0 cv mat c.

One way i have tried is using the setto method and providing a scalar as parameter but there is no way i can tell with this method which pixel value i want to update something like setto x y sclarvalue is there something i m missing. How can i do something similar in gocv. The most common types are. I am trying to find the maximum pixel value of a cv mat.

Shai it seems a good idea initially it probably is faster from the performance point of view since it s guaranteed to store unique values. I m afraid iterating over the image pixels and updating the underneath matrix will update only the last iteration. Opencv efficient pixel access using cv mat ptr pointer example if efficiency is important a fast way to iterate over pixels in a cv mat object is to use its ptr t int r method to obtain a pointer to the beginning of row r 0 based index. Cv 8uc3 for 8 bit 3 channel color images.

The pixels array is stored in the data attribute of cv mat. This modified text is an extract of the original stack overflow documentation created by following contributors and released under cc by sa 3 0. For this example let s draw a red pixel at position 100 50. Create a macro function that obtains the pixel from the array.

Thread i understand that max element return iterators not values. Cv 32fc1 for 32 bit floating point 1 channel grayscale images. Let s suppose that we have a mat matrix where each pixel has 3 bytes cv 8uc3. It renders useless the std find i placed in the code and it will br great if your cv mat is single channel and you need to store an integer however if you need to store cv vec3b a pixel or other complex data types std vector might be better.

Maxvalue is always returning 0. This is why i use maxvalue. Pixel access in mat. The default setting with cv imread will.

To access pixel values in an opencv cv mat object you first have to know the type of your matrix.