36results about How to "Accurate quality evaluation" patented technology

The invention relates to a virtual viewpoint video quality evaluation method. According to the invention, time domain blink distortion of virtual viewpoint video is calculated by taking all pixels in a space-time domain unit as a unit, so that erroneous estimation which is brought about by a pixel-to-pixel time domain blink distortion calculation mode for virtual viewpoint video human eye perception distortion is avoided. The virtual viewpoint video quality evaluation method not only considers distortion brought about by a depth image error but also considers distortion introduced by left and right viewpoint texture images when performing calculation on the time domain blink distortion of the virtual viewpoint video. The virtual viewpoint video quality evaluation method can effectively evaluate the time domain blink distortion which imposes great influences on the subjective quality in the virtual viewpoint video, thereby more conforming to a result of human eye subjective perception when the virtual viewpoint video quality is evaluated, and enabling virtual viewpoint video quality evaluation to be more accurate and more comprehensive.

The invention discloses a no-reference video quality evaluation method based on feature fusion and cyclic neural network. The method fuses spatio-temporal features through a feature fusion network that can input video segments, and uses a cyclic neural network to fuse the quality of different video segments to complete the process. Overall video quality assessment task. The neural network used in the present invention directly uses video segments as input and adopts a feature fusion network. This design can better extract the direct relationship between video frames, thereby obtaining the overall quality evaluation index of the video more accurately. The feature fusion network of the present invention can process multiple frames at one time and obtain a low-dimensional feature, that is, the feature scale is greatly reduced compared with the amount of data, and the total time can be obtained extremely quickly for a whole section of video during operation. big reduction.

The invention discloses a stereo image quality evaluation method through parallax compensation and inter-viewpoint filtering. A high-frequency image and a low-frequency image are obtained by performing parallax compensation and inter-viewpoint filtering on left and right viewpoint images of a stereo image, description of the stereo perception characteristics of the stereo image is completed in the frequency domain, and the quality of the stereo image can be more accurately evaluated; two-dimensional wavelet transformation is performed on the low-frequency image, an approximation coefficient matrix, a horizontal detail coefficient matrix, a vertical detail coefficient matrix and a diagonal detail coefficient matrix are extracted to acquire a part of characteristics, and the characteristics can effectively enhance accuracy of quality evaluation of the distorted stereo image; and the mapping relationship between the characteristic vector of the stereo image and the subjective image quality is constructed by utilizing a support vector regression method so that complex simulation of a human visual system working mechanism can be avoided, excessive dependence on the training process can also be avoided and thus the correlation between the subjective quality and the objective prediction quality can be enhanced.

The invention discloses a quality detection method of Dendrobium huoshanense. The quality detection method comprises: 1) sequencing by using ITS-26SE and ITS-17SE as primers to identify the variety ofa to-be-detected Dendrobium herb; 2) carrying out chromatographic detection on n samples to obtain detection data using a chemical small molecule component schaftoside and / or naringenin as a reference component; 3) respectively carrying out fingerprint detection on the samples to obtain the fingerprint peak area value of the full chemical components of Dendrobium huoshanense; and 4) establishingan analysis model by using the content value of the schaftoside and / or naringenin in the chromatographic data as the response variable and using the peak area value of other components in the fingerprint as the independent variable, screening the variable through a Lasso method, and establishing the characteristic fingerprint model related to the chemical small molecule component. According to thepresent invention, through the first-generation sequencing and the characteristic fingerprinting, the quality of Dendrobium huoshanense is precisely identified and controlled.

The invention discloses a quality detection method of Dendrobium nobile Lindley. The quality detection method comprises: 1) sequencing by using ITS-26SE and ITS-17SE as primers to identify the varietyof a to-be-detected Dendrobium herb; 2) carrying out chromatographic detection on n samples to obtain detection data using a chemical small molecule component schaftoside and / or naringenin as a reference component; 3) respectively carrying out fingerprint detection on the samples to obtain the fingerprint peak area value of the full chemical components of Dendrobium nobile Lindley; and 4) establishing an analysis model by using the content value of the schaftoside and / or naringenin in the chromatographic data as the response variable and using the peak area value of other components in the fingerprint as the independent variable, screening the variable through a Lasso method, and establishing the characteristic fingerprint model related to the chemical small molecule component. Accordingto the present invention, through the first-generation sequencing and the characteristic fingerprinting, the quality of Dendrobium nobile Lindley is precisely identified and controlled.

The invention discloses a method for determining the content of alkaloids, lignans and nucleosides in Radix isatidis or its preparation by adopting a one-measurement multi-evaluation method. , S)-Yichun is used as a reference to establish its relative correction factor with the lignan compound tetracycline B and the nucleoside compounds cytidine, uridine, guanosine, and adenosine, to achieve by measuring only The content of (R,S)-report Yichun of Radix Isatidis or its preparations, the content of the other 5 kinds of lignans and nucleosides with higher content was calculated by the correction factor, so as to be simple, quick, comprehensive and accurate. The multi-index quality evaluation of its preparation is helpful to ensure the quality of the product is controllable and the curative effect is stable, while saving the testing cost and time.