3 results about "Fish eye lens" patented technology

A detection device detects an imaged human from a captured image captured by a ceiling camera using a fish-eye lens, and includes a division part, an area estimation part, and a determination part. The division part divides the captured image into a plurality of areas. The area estimation part calculates a probability that each of the plurality of areas includes a position where a detection target estimated to be a human is present. The determination part determines whether the detection target is a human using the probability of each of the plurality of areas.

The application discloses a compressive correlation imaging method and system with large field of view imaging capability, and belongs to the technical field of space active imaging. The method uses a fisheye lens 13 and a CCD camera 14 to perform fast large field of view imaging on an imaging area, and obtains a large field of view imaging result Fig; N existing regions {A1, A2,..., A i ,…,A N} of the measured objects are determined according to the imaging result Fig; compressive correlation imaging is performed in the regions {A1, A2,..., A i ,…,A N}, and N imaging results {fig1, fig2,..., fig i ,…,fig N} are obtained. The application has the beneficial effects that: (1) the whole to-be-measured region is coarsely imaged by using large field of view imaging, compressive correlation imaging is performed only on the regions where the objects exist, the imaging time can be shortened, the imaging efficiency is improved, and the imaging region is not repeatedly scanned or missed; (2) the signal-to-noise ratio of echo signals is improved, and the detection distance is improved; and (3) the staring imaging time can be shortened by using a compressive correlation imaging reconstruction algorithm, and the imaging efficiency is improved.

The application discloses a kind of semi-automatic fish eye lens calibration method and system. Including: obtaining multiple calibration images by fish eye camera, calibration image includes N group orthogonal parallel straight line pair;Curve extraction is carried out to calibration image by pre-trained neural network;Based on the calibration image after curve extraction, select 2 orthogonal parallel straight line pairs;The orthogonal vanishing point of orthogonal parallel straight line is calculated, and the main line equation is obtained;Based on main line equation, calculate main point position;Select sampling point, obtain corrected image point according to calibration model and main point position, establish error function by image point and to-be-optimized focal length and distortion coefficient, optimize to-be-optimized curve by minimizing global error function, obtain optimized focal length and distortion coefficient.The application forms a kind of semi-automatic fish eye lens calibration system without calibration board by adjusting the internal parameter of fish eye camera, so that fish eye camera has fast and accurate calibration capability.