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access image after cutting

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I have a 600x600 image ( Image) and i am cutting into pieces of 200x200 (piecesImages),by creating 3x3 blocks (Height = 3 , Width =3). Mat pieceImageFrame (200,200,CV_32F); vector piecesImagesRois; vector piecesImages; piecesImagesRois.reserve( Width * Height ); piecesImages.reserve( Width * Height ); for( int i = 0; i ( 199,199) but as I can see I am able to access: piecesImages[ 0 ].at( 300,239999 ) !! I would expect a grabage value but the values seem ok!

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