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Calibration of a stereo camera with images 352x288 p.

When you perform the calibration of the stereo camera on images with a resolution less than 640x480, large errors are obtained. For example, using images with a resolution of 352x288 p. the errors are:

done with RMS error=5.28809
average epipolar err = 4.12764


If I use the same images but with a resolution of 640x480 then the errors are the same:

done with RMS error=0.322039
average epipolar err = 0.280778


Result of calibration with the resolution of 352x288 images. For calibration use the program stereo_calib.

Why do different resolutions produce different errors? Is it possible to calibrate cameras with a resolution of less than 640x480?