50results about How to "Solve the problem of inaccurate judgment" patented technology

The invention provides a vehicle distance alarm method and device. The vehicle distance alarm method comprises the steps of monitoring first driving speed of a first vehicle; calculating a preset vehicle distance corresponding to the first driving speed; judging whether the distance between a first position of the first vehicle and a second position of a second vehicle is less than the preset vehicle distance or not; and an alarm is generated under the condition that the distance between the first position and the second position is judged to be less than the preset vehicle distance. According to the invention, a problem of inaccurate judgment for a safe vehicle distance is solved, and the accuracy and the efficiency of safe vehicle distance judgment are improved.

The invention provides a detection method and device for image residue of a liquid crystal panel. The method comprises after the liquid crystal panel displays a standard checkerboard picture for a time value, changing the picture into a designated gray scale and obtaining an image residue image; performing Fourier transform on a digital image of the standard checkerboard picture and the image residue image to obtain a first energy frequency spectrum and a second energy frequency spectrum; converting the first energy frequency spectrum and the second energy frequency spectrum into polar coordinates to become functions related to a polar angle and frequencies, and performing 0-2pi summation under each frequency with respect to the polar angle, thus obtaining a checkerboard energy frequency spectrum and a residue image energy frequency spectrum; solving a characteristic frequency corresponding to a maximal energy value in all energy values of the checkerboard frequency spectrum; solving frequencies of the residue image energy frequency spectrum as a first energy value and a second energy value corresponding to the characteristic frequency and a zero frequency; dividing the second energy value with the first energy value to obtain a residue image evaluation value.

The invention discloses an automatic judging method, device and system for the service life of a filter screen. According to the automatic judging method, device and system, a wind speed sensor is used for detecting the wind speed change, the fouling and blockage situations of the filter screen are judged according to the attenuation rate of the wind speed, because an air conditioner fan has a fixed wind speed under each of different wind gears, the wind speed would be gradually reduced along with the dirtying and blockage of the filter screen, after the wind speed is reduced to a certain degree, different degrees of warnings are given to the user. Compared with the prior art, the automatic judging method, device and system for the service life of the filter screen solve the dependency on air quality level, do not need air quality detection cost and do not need the user to set manually according to the local air quality level, and therefore, the problem of imprecision due to judging according to the air quality level is solved, and moreover, the user does not need to manually set the air quality level and manually clear the accumulated time; the automatic judging method, device and system for the service life of the filter screen are more intelligent and more friendly to human and very convenient for the user.