3results about How to "Consistent clarity" patented technology

The invention discloses a circuit board detection method and system based on computer vision, and relates to the technical field of circuit board detection, and the method comprises the following steps: obtaining the temperature field distribution data of the surface of a circuit board based on the structural deformation of the circuit board caused by non-uniform heating after high-temperature operation, establishing a temperature-associated morphological mapping model according to the temperature field distribution data, and generating a circuit board deformation reference band updated along with time through the morphological mapping model; and constructing a dynamic focal plane tracking chain in an image acquisition process by using the deformation reference band, converting height change information of a corresponding region in the deformation reference band into a focal length displacement control instruction, and driving focal length adjustment of the camera device in real time. Through dynamic focal plane tracking and illumination response control, the focal length is matched with circuit board deformation in real time, the illumination difference is compensated, dynamic balance of image definition and brightness is achieved, and therefore the consistency of circuit board detection images and the accuracy of defect recognition are improved.

The utility model discloses a zoom projection lens which comprises a first lens assembly, a second lens assembly, a third lens assembly, a diaphragm, a fourth lens assembly and a fifth lens assembly which are sequentially arranged along a direction from an object space to an image space. A full-group linkage zoom design is adopted, and the first lens assembly is set as a zoom group for changing the focal length of the projection lens; the second lens assembly, the third lens assembly, the fourth lens assembly and the fifth lens assembly are arranged to be a compensation group used for offsetting the image surface position change caused by the movement of the zoom group. When zooming is carried out from the telephoto end to the wide-angle end, the distance between the second lens assembly and the third lens assembly is gradually increased. According to the utility model, the space occupied by the lens is reduced, so that the lens can adapt to the working condition of a compact installation space, the lens can maintain excellent imaging performance at different focal lengths within the working temperature range of a special application scene, and the flexible adaptability of the zoom projection lens is improved. The utility model also provides a projection system.

The application provides a partitioned DLP micromirror control method and system based on pixel content recognition, and relates to the technical field of DLP display. The method first receives and pre-processes an external video stream signal, extracts brightness data, and completes frame buffer updating and alignment; then determines the brightness threshold of the invalid area dynamically through an adaptive threshold brightness recognition algorithm, and marks the candidate invalid pixels; subsequently screens out static invalid pixels by using an adjacent frame difference static judgment algorithm; divides the static invalid area and demarcates the boundary coordinates through a region connectivity analysis algorithm; finally, matches the driving sub-circuit module number based on the boundary coordinates, constructs a partition control instruction, and issues it after verification and packaging. The application realizes the differential driving of the DLP micromirror partition, can completely eliminate the driving power consumption of the invalid area, improves the power consumption optimization effect, does not lose the display quality, responds in real time, has strong compatibility, and is suitable for compact DLP devices such as vehicle machines.