1、 Laser resolution of laser printer
The laser resolution in a laser printer refers to the minimum line width or dot matrix size that the printer can recognize and output during printing. It is usually expressed in dots per inch (DPI), which is the number of dots that can be output per inch. The higher the resolution of a laser printer, the clearer the printed image and the more realistic the details are. Common laser resolutions include 600DPI, 1200DPI, 2400DPI, 4800DPI, 9600DPI, etc. The resolution of laser printers is mainly affected by factors such as the hardware performance of the printer, the quality of the printing medium, and printing parameters.
2、 Theoretical resolution of laser triangulation
In laser triangulation, resolution usually refers to the minimum height or size that can be resolved. The resolution calculation of laser triangulation involves multiple parameters, including camera pixel size, tilt angle between laser and CCD target surface, lens focal length, object distance, etc. The specific calculation formula may vary depending on different application scenarios and parameter settings. But generally speaking, the theoretical resolution of laser triangulation can be calculated through geometric relationships and corresponding formulas. For example, when the pixel size of the camera used is 4.4 μ m, the tilt angle is 30 degrees, the lens focal length is 25mm, and the object distance is 300mm, the minimum distinguishable height can be calculated.
3、 Resolution of laser ranging
The resolution of laser ranging refers to the ability of laser to distinguish adjacent targets. It is divided into horizontal resolution and distance (vertical) resolution.
Lateral resolution: also known as angular resolution, refers to the minimum size between two adjacent targets that can be resolved within a specified distance in the direction perpendicular to the laser emission axis. It is mainly determined by the receiving field of view of the laser rangefinder and the reflection angle of the laser beam.
Distance resolution: refers to the minimum distance between two adjacent targets measured on the laser emission axis plane within a specified distance. It is mainly determined by the photoelectric conversion time of the rangefinder, the oscillation frequency of the oscillator, and the switching time of the shaping circuit, which is determined by the instrument itself.
4、 Resolution of LiDAR
The resolution of a LiDAR describes the level of precision it perceives in its environment. The laser points emitted by the LiDAR are distributed in three-dimensional space, and these points are constantly refreshed at a set frequency, forming a "point cloud". The resolution of LiDAR can be measured by indicators such as global resolution, angular resolution, and point frequency.
Global resolution: When the point cloud distribution of a LiDAR is uniform, its clarity can be measured by the number of points on the two-dimensional projection surface, known as global resolution. The global resolution is usually represented in the form of "horizontal pixels x vertical pixels".
Angular resolution: The degree of angle between adjacent beams of laser emitted by a LiDAR is called angular resolution. It reflects the angular resolution capability of LiDAR.
Point frequency: It is the number of laser points emitted per second by a laser radar in a three-dimensional field of view, and is a comprehensive indicator reflecting the perception clarity of the laser radar. At the same refresh rate, the higher the dot frequency, the denser the point cloud, and the clearer the single frame image.
In summary, the calculation method and influencing factors of laser resolution vary depending on the application field and specific parameters. In practical applications, it is necessary to choose the appropriate laser resolution and corresponding calculation method based on specific needs and conditions.