96 results about "Distance curve" patented technology

The invention discloses a motion key frame extracting method based on distance curve amplitudes. The motion key frame extracting method based on the distance curve amplitudes is used for extracting key postures of motion to describe an original motion sequence. The motion key frame extracting method based on the distance curve amplitudes includes the steps: firstly, selecting a group of new key frame distances to be as distance characteristics; secondly, carrying out dimensionality reduction on the distance characteristics through a principal component analysis method (PCA method for short), extracting first-dimension principal components, removing noises through smoothing filtering, and a characteristic curve is achieved, wherein substantive characteristics of an original motion can be well reflected; thirdly, acquiring initial key frames through extraction of local extreme points on the characteristic curve; evenly inserting corresponding numbers of frames among initial adjacent key frames according to the differences of amplitudes of the characteristic curve, then combining overstocked key frames, and final key frame collection is achieved. A lot of experimental data show that the motion key frame extracting method based on the distance curve amplitudes can not only satisfy good effects on visual generality of the motion, but also has low a compression ratio and an error ratio, and a processing procedure can be automatically finished without manual interference.

The invention discloses a distance detecting device and a distance detecting method. The device and the method are used for detecting the distance to be detected to an object. The distance detecting device comprises an emitter, a first receiver and a second receiver, wherein the emitter is used for emitting light rays in the emitting direction, the first receiver is arranged at one side of the emitter and is provided with a first light incidence surface used for receiving light rays reflected by the object to generate first electric signals, and the second receiver is arranged between the emitter and the first receiver and is provided with a second incidence surface used for receiving the light rays reflected by the object to generate second electric signals, wherein the first receiver is provided with a first electric signal distance curve, the second receiver is provided with a second electric signal distance curve, in addition, the first electric signal distance curve has a first wave crest, the second electric signal distance curve has a second wave crest, and the distance corresponding to the first wave crest is greater than the distance corresponding to the second wave crest. The distance detecting device and the distance detecting method have the advantages that whether the object is positioned in the preset distance or not is determined according to the intensity relationship of two electric signals, and the distance measuring accuracy is effectively improved.

The invention discloses a micro-duplicate gear tooth break defect detecting method based on gear center distance curves. The method includes the steps: dividing large and small gear threshold values of gear images by the aid of a rapid neighborhood trough analysis mode; detecting gear profile edges by the aid of a radial edge scanning mode; calculating distances among gear image edge points and agear mass center to obtain distance curves from gear profile points to the mass center. Tooth break detection of the gear images is converted and quantized into analysis of the gear center distance curves after Gaussian smoothing. The method can detect whether the micro-duplicate injection molding gear exists defects such as tooth break and breakage or not, defect positions are marked under the defect condition, and tooth break and breakage defects can be rapidly and accurately detected.