Method for determining the exposure time for a 3D recording

A method for determining an exposure time t1 for a recording to determine 3D coordinates of an object, the method comprising:

• projecting a pattern onto the object;
• recording light reflected by the object;
• producing a first recording of the object with a predetermined exposure time t0;
• determining in the first recording regions of the object lying within a measurement volume;
• and
• determining the exposure time t1 for a second recording depending on:
• the predetermined exposure time t0,
• a mean greyscale value bn of the regions determined in the first recording, and
• an ideal greyscale value bopt,
• wherein the exposure time t1 is determined according to the formula
• t
• 1
• =
• b
• opt
• b
• n
• ⁢
• t
• 0
• .

A method for determining an exposure time t1 for a recording to determine 3D coordinates of an object, the method comprising:

• projecting a pattern onto the object;
• recording light reflected by the object;
• producing a first recording of the object with a predetermined exposure time t0;
• determining in the first recording regions of the object lying within a measurement volume;
• and
• determining the exposure time t1 for a second recording depending on a mean greyscale value of regions determined in the first recording,
• wherein the exposure time t1 is determined exclusively based on the regions of the recording lying within the measurement volume when a predetermined number of support points are present within the measurement volume, wherein a transition from a determination based on regions lying outside the measurement volume to a determination based on regions lying within the measurement volume takes place smoothly by including regions lying within the measurement volume in the weighting, and by weighting the regions lying within the measurement volume more heavily than the regions lying outside the measurement volume.