About widthstep of images in opencv

Hello everyone , I meet you again , I'm your friend, Quan Jun .

stay OpenCV Of IplImage In pointer structure , There is a member widthStep, How to determine this value , I've had a headache for a long time recently , Finally, I want to understand , Now?

Take it out and talk to you , Don't know if my idea is right , At least there was no error in my verification .

widthStep It should be equal to width*3, But because of 4 Byte alignment problem , Sometimes you need to fill in at the end of a line 1-3 Bytes , Now widthStep>width*3.

therefore , widthStep There are two ways to calculate the value of ：

1. When （width*3）%4=0, At this time width*3=widthStep;

2. When （width*3）%4 ！=0, here widthStep=（width/4+1)*3.

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