Can Pixel Value Be 0 Cv Mat C

Thread i understand that max element return iterators not values.

Can pixel value be 0 cv mat c. Cv 32fc1 for 32 bit floating point 1 channel grayscale images. Cv 32fc3 for 32 bit floating point 3 channel color images. Cv 8uc3 for 8 bit 3 channel color images. The most common types are.

The default setting with cv imread will. 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. How can i do something similar in gocv. 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.

I am trying to find the maximum pixel value of a cv mat. Pixel access in mat. For this example let s draw a red pixel at position 100 50. This modified text is an extract of the original stack overflow documentation created by following contributors and released under cc by sa 3 0.

Cv 8uc1 for 8 bit 1 channel grayscale images. 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. The pixels array is stored in the data attribute of cv mat. In order to access matrices some template methods do exist but this means it is necessary to pass the data type to the method when accessing the element value specified by the indexes i j.

Create a macro function that obtains the pixel from the array. Maxvalue is always returning 0. I m afraid iterating over the image pixels and updating the underneath matrix will update only the last iteration. This is why i use maxvalue.

Let s suppose that we have a mat matrix where each pixel has 3 bytes cv 8uc3.