Zhejiang University

Arcsoft Corporation Limited

Jiangsu Liside New Material Co., Ltd.

Multimedia Image Solution Limited

Hua Lei

Jin Wang

Jinzhong Li

Kai Chen

Lizhen Wang

Mingming Zhu

Yang Lu

Li Mei

Jiacai Zhao

The present disclosure provides an aluminum phosphite-based complex with dual-peak thermal gravity decomposition characteristics and a preparation method and use thereof. A structural formula of the complex is as follows: ((HPO)Al)·((HPO)Al), wherein x is 0.01-0.5 and represents a molar ratio of (HPO)Al to (HPO)Al. The dual-peak thermal gravity decomposition characteristics are as follows: a first gravity peak temperature is 460-490° C., and a second gravity peak temperature is 550-580° C. The preparation method includes: uniformly mixing aluminum phosphite and aluminum hydrogen phosphite according to the ratio in the structural formula, and then performing stepwise heating at a rate of 5° C./min to raise the temperature of a mixture from the normal temperature to no more than 350° C. within 1-10 hours, so as to obtain the aluminum phosphite-based complex with the dual-peak thermal gravity decomposition characteristics. The complex may serve as or is configured to prepare a flame retardant or a flame-retardant synergist.

Aluminum phosphite-based complex with dual-peak thermal gravity decomposition characteristics and preparation method and use thereof

The present invention discloses a crystalline aluminum phosphite, preparation and an application thereof. The compound has the following structural formula (I): where, x is an integer of 1-6; n, y and p are an integer of 1-4; M is Ca, Mg, Al, Zn, Fe, Sn or Ti. The preparation method includes: after dissolving phosphorous acid and hydrogen phosphite into water, adding concentrated phosphoric acid for reaction at 80-90° C., then performing drying at low temperature, dehydration reaction at high temperature, washing and drying. The compound has very high thermal decomposition temperature, high phosphorus content, and good flame retardant property, low water absorption and low acidity; moreover, the compound can serve as a halogen-free flame retardant component of high polymer materials.

Condensate of poly/mono-phosphorous acid and aluminum hydrogen phosphate, preparation and application thereof

An embodiment of the present disclosure provides a method for enhancing a fingerprint image, identifying a fingerprint, and starting-up a application program. The method for enhancing the fingerprint image includes: removing a background texture of a fingerprint image of a current frame to obtain a pure fingerprint image; performing a first preprocessing on the pure fingerprint image to obtain a first pre-processed image; obtaining an effective area of the first pre-processed image; performing direction field estimation and direction field correction on the effective area; and performing a second pre-processing on the effective area after direction field correction to obtain an enhanced fingerprint image. With the solution of this embodiment, the number of fingerprint collections is reduced, the quality of fingerprint images is improved, the complexity of fingerprint collection is reduced, the efficiency of fingerprint unlocking is improved, and the user experience is improved.

Method for enhancing fingerprint image, identifying fingerprint and starting-up application program

The present invention discloses a crystalline aluminum phosphite, a preparation method thereof and an application thereof as or for the preparation of a flame retardant or a flame retardant synergist. The preparation method has the following processes: 1, reacting aluminum hydrogen phosphite with an aluminum-containing compound in water at 80-110&#xb0; C. to obtain a precipitate in the presence of no strong acid or a small amount of strong acid; 2, washing and filtering the precipitate; 3, drying the precipitate at 100-130&#xb0; C.; 4, continuously heating the dried solid step by step at a low speed, where the material temperature is increased to not exceeding 350&#xb0; C. from room temperature at about 5-10 h, with a temperature rise rate not exceeding 5&#xb0; C./min. Compared with amorphous aluminum hydrogen phosphite, the crystalline aluminum phosphite has a higher thermal decomposition temperature, lower water absorption and weaker acidity, and can be synergistic with diethyl aluminum hypophosphite to achieve better flame retardant property and thus, is used for a halogen-free flame retardant component of high polymer materials.

Crystalline aluminum phosphite, preparation method and application thereof

A panoramic image blurring method, a terminal and a computer readable storage medium are provided. A main technical solution is to synthesize a panoramic image having blurring effect in combination with a panoramic stitching technology and a double-camera configuration. Photographs the images of a scene from the multiple angles of view with a double-camera component, and the images from the angles of view may have a certain overlap area. Subsequently, the scene images and scene depth images from these angles of view may be spliced with the panoramic stitching technology, to obtain a full-scene image and a full-scene depth image of a wide-viewing angle. In this way, a panoramic scene image having the blurring effect may be rendered subsequently. Through a solution in the embodiment, the panoramic image having the blurring effect may be acquired, the panoramic photographing may achieve an effect of simulating large-aperture imaging of a professional camera, and a better impression of a photo may be brought.

Blurring panoramic image blurring method, terminal and computer readable storage medium

An image processing method and device is provided. The method includes: performing brightness adjustment on each frame of image in a video; performing offset compensation on each frame of image after the brightness adjustment; and performing time domain filtering on each frame of image after the offset compensation.

Image processing method and device

The present invention is to provide a method for enabling an electronic device to read at least two images taken from different positions by a digital camera mounted with a fisheye lens; acquire internal and external parameters of the fisheye lens corresponding to the different positions as well as the vignetting coefficient for eliminating the vignetting on the images; perform exposure compensation and color calibration on the images for letting them have consistent brightness and hues; project the images onto a spherical surface and spread out the spherical surface to form a two-dimensional spread-out picture based on the parameters; register the overlapped images projected on the two-dimensional spread-out picture and adjust the offset of corresponding pixels thereof, register and adjust the brightness and hues of the overlapped images into consistency; and fuse overlapped images together to produce a 360-degree spherical panorama without having any noticeable stitching seam between the images.

Method for stitching together images taken through fisheye lens in order to produce 360-degree spherical panorama

The present invention is to provide a method for ensuring perfect stitching of a subject's images in a real-site image stitching operation, which enables an electronic device to read two real-site images which are taken respectively of different parts of the same site and each of which has an overlap area of a common subject; to determine and choose an optimal stitching path bypassing the subject; to construct a mask diagram such that, within a difference diagram of the overlap areas, the farther a pixel on one side of the optimal stitching path is from the optimal stitching path, the greater the pixel's value, and the farther a pixel on the other side of the optimal stitching path is from the optimal stitching path, the smaller the pixel's value; and to stitch and fuse the overlap areas together through a fusion algorithm, with the mask diagram serving as a weight.

Method for ensuring perfect stitching of a subject's images in a real-site image stitching operation

A metering pump with a special-shaped cavity comprising a housing, a rotor and two cover plates. The housing is a cylinder with a special-shaped surface inner cavity formed by combining two circular arc surfaces with two non-circular arc surfaces and a planar surface, an inlet and an outlet. The rotor comprises a rotor body and two pairs of combined sliding plates. The housing is matched with the cover plates for constituting a sealed cavity. When the rotor rotates, the non-circular arc surface of the special-shaped surface inner cavity can enable the two pairs of the combined sliding plates to slide in a cross manner so as to suck in fluid from the inlet and press out the fluid from the outlet. When the rotor rotates one cycle, four standard volumes are formed in a cavity body and the equal quantity of the fluid flows by the cavity body.

Growing community of inventors

Hangzhou, China

Hua Lei