Image Coordinate Systems

The conventions below apply to all eVision functions and results.

• Pixel coordinates are usually given as integer numbers.

• Some results can use subpixel precision with real (floating point) numbers.

• Some exceptions apply and are documented per library.

Integer coordinates

• The origin (0,0) of the coordinate system is the upper left pixel of the image.

• The lower right pixel is (width-1, height-1).

  

Real coordinates

• With floating point (x,y) coordinates, the origin is the upper left corner of the upper left pixel.

• The first pixel area ranges in [0,1[ for X and Y axis.

• Coordinates greater or equal than the width or the height are outside the image.