Image Coordinate Systems

The conventions below apply to all Open eVision functions and results.

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Pixel coordinates are usually given as integer numbers.

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

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Some exceptions apply and are documented per librarie.

Integer coordinates

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

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

Real coordinates

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

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

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