Patent ID: 8059155

Claim:
A measuring system for measuring a field of view (FOV) of a digital camera module, the measuring system comprising: a measuring chart defining a colored portion, the colored portion comprising a straight side; a parameter inputting module for inputting relative parameters comprising the distance between the measuring chart and a lens module of the digital camera module, and the length of the straight side; and a processing module connected to the parameter inputting module for receiving the relative parameters and connected to the digital camera module for receiving electronic image signals converted from images of the colored portion and the measuring chart screened by the lens module, the processing module being configured for measuring the number of pixels of a side of the image of the colored portion corresponding the straight side and the number of pixels of a diagonal of the image of the measuring chart screened by the lens module, and calculating the FOV according to the distance, the length, and the measured numbers, wherein the FOV is calculated according to this formula: Î¸=2Ã—arc tan( aÃ—P d /2 Ã—P a Ã—s ), wherein Î¸ is the FOV, a is the length, P d is the number of the pixels of the diagonal of the image of the measuring chart screened by the lens module, P a is the number of the pixels of the side of the image of the colored portion corresponding the straight side, and s is the distance.