An apparatus (100; 200; 700) for three-dimensional measurement of an object, comprising: evaluation means for determining measuring results in the form of a height profile; trigger means (130; 230; 716, 722, 726) configured to obtain image information from a measurement camera and to trigger, in dependence on image content of the image information (110; 210; 710), forwarding of the image information to the evaluation means for evaluation of the image information by the evaluation means for determining measurement results; wherein the trigger means (130; 230; 716, 722, 726) is configured to detect when the image content has shifted with respect to a reference image content by at least a predetermined shift or by more than a predetermined shift and to trigger, in dependence on the detection of a shift, forwarding of the image information for the evaluation of the image information by the evaluation means, wherein the trigger means is configured to perform a comparison of one or more current image sensor analog signals (210; 710) to one or more reference image sensor analog signals stored in an analog storage to detect a temporal change of image information, wherein the analog comparison corresponds to forming difference images and allows detection of a movement of the image content, and to trigger the output of a digitized version of the image information via a digital interface (242; 742) of an image sensor of the measurement camera based thereon, wherein the trigger means is configured to analyze different features in different areas of the image content, wherein, when evaluating features in different areas of the image content, objectively different image contents are considered at the same time, wherein the trigger means is configured to decide in which image contents there are relevant features to trigger output of a digitized version of the image information. evaluation means for determining measuring results in the form of a height profile; trigger means (130; 230; 716, 722, 726) configured to obtain image information from a measurement camera and to trigger, in dependence on image content of the image information (110; 210; 710), forwarding of the image information to the evaluation means for evaluation of the image information by the evaluation means for determining measurement results; wherein the trigger means (130; 230; 716, 722, 726) is configured to detect when the image content has shifted with respect to a reference image content by at least a predetermined shift or by more than a predetermined shift and to trigger, in dependence on the detection of a shift, forwarding of the image information for the evaluation of the image information by the evaluation means, wherein the trigger means is configured to perform a comparison of one or more current image sensor analog signals (210; 710) to one or more reference image sensor analog signals stored in an analog storage to detect a temporal change of image information, wherein the analog comparison corresponds to forming difference images and allows detection of a movement of the image content, and to trigger the output of a digitized version of the image information via a digital interface (242; 742) of an image sensor of the measurement camera based thereon, wherein the trigger means is configured to analyze different features in different areas of the image content, wherein, when evaluating features in different areas of the image content, objectively different image contents are considered at the same time, wherein the trigger means is configured to decide in which image contents there are relevant features to trigger output of a digitized version of the image information.