Respiration monitor

A system for respiration monitoring, comprising:

• a garment, having a size and shape suitable to surround and fit snugly around a body of a sleeping infant, and which comprises, on at least a portion of the garment that fits around a thorax of the infant, a pattern of light and dark pigments having a high contrast at a near infrared wavelength and extending around a front, a back and sides of the thorax when the garment is fitted around the body of the infant,
• wherein the pattern comprises an arrangement of light or dark geometrical shapes, which repeat across at least the portion of the garment;
• and
• a camera head, which is configured to be mounted in proximity to a bed in which the infant is to be placed, and which comprises an image sensor and an infrared illumination source, which is configured to illuminate the bed with radiation at the near infrared wavelength, and which is configured to transmit a video stream of images of the infant in the bed captured by the image sensor to a processor, which analyzes movement of the pattern in the images in order to detect a respiratory motion of the thorax,
• wherein the processor is configured to calibrate a scale of the images responsively to a distance between the repeating shapes, and
• wherein the shapes have respective corners, and the processor is configured to identify and track the corners in the images in order to analyze the movement.