Laser collimator module on a mobile device for image measurement

A mobile device with image measurement capability, comprising:

• a mobile device including a housing, a motherboard installed in the housing, a microprocessor installed on the motherboard, a memory unit installed on the motherboard and electrically connected to the microprocessor, a camera unit installed on a rear surface of the housing having a pre-determined angular field of view and being electrically connected to the microprocessor to retrieve an image with a horizontal distance of a horizontal reference line being defined across said field of view at an image plane, and a touch screen installed on a front surface of the housing and electrically connected to the microprocessor to display the image;
• a laser collimator module installed on the motherboard in the housing of the mobile device and operated by the microprocessor, the housing further having an opening hole at the rear surface thereof disposed in correspondence with said laser collimator module projecting a collimated light therethrough, the laser collimator module including a printed circuit board with a plurality of connecting elements electrically connected to the microprocessor, the laser collimator module including a laser diode disposed at a side of the printed circuit board, a driving circuit disposed between and coupled to the printed circuit board and the laser diode, a collimating lens disposed in front of the laser diode, and a case body covering the printed circuit board, the laser diode and the collimating lens and exposing the connecting elements of the printed circuit board, said case body further including a light emitting hole on a surface thereof for projection from the laser diode, the collimated light being at a pre-determined distance from an optical axis of the camera unit, the laser collimator projecting the collimated light parallel with the optical axis of the camera unit, said optical axis and collimated light respectively being perpendicular to said horizontal reference line;
• and
• a camera program installed in the memory unit and operated by the microprocessor to activate the camera unit, record the image and thereby retrieve an image data, said image data including pixel values for further retrieving of a set of pixel values horizontally and a pixel value of a dot within the set of pixel values;
• whereby the microprocessor matches the set of pixel values with the horizontal distance of the horizontal reference line and sets a point of the collimated light on the horizontal reference line as the dot in the image, establishing a reference point for measurement with the pixel value of the dot.