Light spot imaging device

The invention relates to a light spot imaging device. The light spot imaging device comprises a CCD (Charge Coupled Device) photosensitive device used for sensing based on an optical signal obtained based on a light spot to obtain an electrical signal, and obtaining at least one group of data frames based on the electrical signal; a calculation unit used for calculating a position P point with a maximum gray value in one frame and a gray value MAX of the P point from a frame start direction to a frame tail direction; a first comparison unit used for comparing the gray value MAX of the P point with a preset over exposure threshold SAT; a second comparison unit used for that if the MAX is greater than or equal to the SAT, taking the P point as the center and taking q pixel positions around the P point, and comparing the q pixel positions with a preset threshold SECTH; and a calculating unit. In view of the lacks of the prior art, the main purpose of the invention is to provide the light spot imaging device, and a calculation method for calculating an imaged laser spot center under the condition that a CCD linear array photosensitive device in laser triangle measurement is overexposed, and the method has a very important significance in guaranteeing a laser scanning vision system to acquire a high precision measurement result in a very large dynamic range.