41 results about "Imaging quality" patented technology

A method including presenting a video sequence on a display where the video sequence includes video frames, calculating a quality indicator with respect to the video frames and automatically indicating which video frames meet or exceed a predetermined image quality threshold depending on the quality indicator.

The invention discloses a method for evaluating the quality of an image shot by an unmanned aerial vehicle, which is characterized in that for an image shot by the unmanned aerial vehicle in patrol inspection, the quality of the image is analyzed from the whole image and local details; for blurring generated by focusing misalignment caused by motions or shakes of the unmanned aerial vehicle, a frequency domain sharpness index and the distribution density and orientation features of edge segments in a space domain are firstly fused so as to judge whether an image captured by the unmanned aerial vehicle image is blur or not on the whole; under the condition that the image quality is acceptable on the whole, salient edge regions in the image are further searched, and the local detail blur degree of image edges is judged through analyzing the average width of difference salient edges. The method is applied to images shot by the unmanned aerial vehicle under outdoor conditions, the image quality can be effectively evaluated under various complex backgrounds without being influenced by the image content, and the evaluation is consistent with subjective evaluation of people in grade.

The image quality correcting circuit according to the present invention is made up of a mean value computer 10 for computing the mean value of the luminance levels of every plural picture element of a video signal inputted to a video signal input terminal 12, an occurrence frequency counter 13 for counting the occurrence frequency data of plural luminance levels computed by the mean value computer 10, a linear interpolator 15 for forming a correcting characteristic line based on the output points of the counted value from the occurrence frequency counter 13, and an image quality corrector 16, and wherein the linear interpolator 15 provides the correcting characteristic line consisting of a linearly interpolated series of continuous segments, which are obtained by sequentially connecting the luminance levels of an x-axis and the occurrence frequencies on a y-axis, and the image quality corrector 16 corrects the video signals inputted from the video signal input terminal 12 according to the linearly interpolated correcting characteristic line.

The invention relates to a lens driving device and belongs to the technical field of micro-cameras. The lens driving device comprises a first magnetic yoke ring, an insulation sheet, a first spring piece, a gasket, a lens carrier, a coil, a group of magnets and a second spring piece, wherein the outer profile of the first magnetic yoke ring is rectangular or circular, the insulation sheet is matched with a magnetic yoke ring cavity, the first spring piece and the gasket are placed in the magnetic yoke ring cavity, the lens carrier is provided with a lens placing cavity, the lens carrier and the coil are placed in the magnetic yoke ring cavity, and the second spring piece is placed in magnetic yoke ring cavity and provided with a group of third spring wires. The lens driving device has the advantages that a good even distribution effect is showed by the magnetic lines of the magnetic field generated by the magnets, an electromagnetic induction force of the coil obtained in an effective length range is enabled to be enlarged significantly, so that good driving characteristics are reflected, power driving power consumption can be reduced, assembly efficiency can be improved, the phenomenon that foreign bodies in the cavity drop on a sensor surface of a camera from lens carrier mating holes is avoided, wherein the phenomenon is caused by impact and vibration, so that image quality is ensured, harsh requirements of a lens optical axis degree can be met, and electromagnetic radiation generated by the coil can be prevented from affecting surrounding components.

The invention relates to a self-adaptive optical image high resolution restoration method combined with frame selection and blind deconvolution, comprising the following steps: firstly, a short exposure image sequence gn (x, y) is recorded when a self-adaptive optical closed loop is corrected; shannnon entropy of each frame of image in the sequence is calculated; a degraded image gm (x, y) with lower entropy is selected for blind deconvolution image restoration; secondly, an initial value hm (x, y) of a point spread function is generated by utilization of random phase; thirdly, a target f(x, y) is estimated by using the gm(x, y) and the obtained hm (x, y), and an estimated value f(x, y) is obtained after addition of positivity limitation on the target; fourthly, an estimated value hm (x, y) of the point spread function is obtained by using the gm (x, y) and the f(x, y), and an estimated value h(x, y) is obtained after addition of positivity limitation in the same way; fifthly, inspection is made whether an iterated value h(x, y) and an iterated value f(x, y) meet iteration stopping requirements or not; if the iterated values do not meet the iteration stopping requirements, the third step is returned; if the iterated values meet the iteration stopping requirements, circulation is stopped and the f(x, y) and the h(x, y) are outputted. The invention has the advantages of effective improvement of restoration quality, acceleration of convergence rate, capability of well compensating correction capability under hardware limitation of a self-adaptive optical system, and improvement of imaging quality.

The present invention relates to a super-resolution image quality evaluation method. The method comprises: employing a pixel corresponding relation between a low-resolution image and a super-resolution image to obtain a corresponding relation between local image blocks, respectively solving the energy and the texture information of the low-resolution image and the super-resolution image, and obtaining the vision similarity between the changing of the two features. The final super-resolution image quality is obtained through evaluation of the vision similarity of the local image blocks of the low-resolution image and the super-resolution image. The experiment result shows good effects in the quality evaluation of the super-resolution image.

The invention discloses a low-illumination monitored image enhancement method based on similar scenes. The method includes obtaining high-illumination images similar to low-illumination monitored images to construct a similar scene image library, wherein the sizes of images in the image library are the same with those of the low-illumination monitored images; pre-processing the low-illumination monitored images to improve image quality; searching an image the most similar to the low-illumination monitored images to be enhanced as a reference image in the similar scene image library, wherein the image the most similar to the low-illumination monitored images to be enhanced has the smallest pixel difference sum with the low-illumination monitored images to be enhanced in the similar scene image library; and matching a histogram of the low-illumination monitored images to be enhanced with a histogram of the reference image by using a histogram matching method so as to enhance the low-illumination monitored images. The definition of the low-illumination monitored images enhanced by the method can be improved.

The invention relates to a currency counting and detecting machine technology, in particular to a currency counting and detecting machine with the automatic brightness calibration function. In the prior art, the defects that image quality of a currency counting and detecting machine is unstable, a user cannot conveniently use the currency counting and detecting machine, and the maintenance cost is high exist. According to the currency counting and detecting machine with the automatic brightness calibration function, a control circuit comprises a digital signal processing chip DSP, an FPGA, multi-channel enhancement type field-effect transistors, programmable digital potentiometers and an AD conversion chip, wherein the digital signal processing chip DSP and the FPGA are connected through an EMIF, the multi-channel enhancement type field-effect transistors are connected with a general I/O port of the FPGA, the programmable digital potentiometers are connected between the multi-channel enhancement type field-effect transistors and a CIS in series, the input end of the AD conversion chip is connected with the signal output end of the CIS, and the output end of the AD conversion chip is connected with the FPGA through the general I/O port. The currency counting and detecting machine with the automatic brightness calibration function has the advantages that image quality of the currency counting and detecting machine is improved, the maintenance cost is reduced, and operation and use are convenient.

The invention discloses a gradient coil for magnetic resonance imaging and a processing method thereof. The gradient coil comprises an insulating base plate and at least three sub-coils; at least onesub-coil is a curved coil, and the remaining sub-coils are planar coils; the first surface of the insulating base plate forms a curved portion and the second surface forms a planar portion; the curvedcoil is fixed on the curved portion; the shape of the curved coil is adapted to the shape of the curved portion; and the planar coil is fixed on the planar portion. The invention also discloses a processing method for a gradient coil for magnetic resonance imaging. Deformation of the coil during the processing process can be effectively avoided, the processing precision and the performance of thegradient coil are improved, the efficiency and the gradient strength of the gradient coil are improved, image distortion can be effectively avoided, and the image quality is improved.

The invention provides an optical imaging lens. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, afourth lens, a fifth lens, a sixth lens and a seventh lens, concave and convex curved surface arrangement of the surfaces of the lenses is controlled, the restriction is met that a distance (D11t61)on the optical axis from the object side surface of the first lens to the object side surface of the sixth lens, the aperture value (Fno) of the optical imaging lens, the image height (ImgH) of the optical imaging lens and the Abbe numbers (V2, V3, V4, V5) of the second lens, the third lens, the fourth lens and the fifth lens meet the relation: D11t61*Fno/ImgH<=1.200 and 110<=V2+V3+V4+V5<=145, andtherefore, the length of the optical imaging lens system is shortened, the aperture is increased and good imaging quality is maintained.

In an image display device having, in each pixel, an electron emitter containing a first electrode, an insulating layer, and a second electrode arranged in this order, the insulating layer is formed by anodic oxidation using the first electrode and has defects, if any, in a number of 3×10¹⁹ or less cubic centimeter. The electron emitter has a longer life, and the image display device using the electron emitter has improved reliability and image quality.

An embodiment of the present invention relates to the technical field of image processing and discloses a pedestrian image quality evaluation method, an electronic device, and a computer-readable medium. The method comprises a step of separately determining a first score and a second score of an image to be evaluated, wherein the first score is positively correlated with the completeness of a pedestrian image included in the image to be evaluated, and the second score is negatively correlated with the blur degree of the image to be evaluated, and a step of determining a target score accordingto the first score and the second score, wherein the target score is an image score of the image to be evaluated. In the invention, the quality of the image to be evaluated is determined according tothe completeness of the pedestrian image included in the image to be evaluated and the blur degree of the image to be evaluated, and the quality of the pedestrian image can be evaluated reasonably andobjectively.

When an nth frame of encoded data is stored in a compressed-data storage area that stores 15 frames of encoded data, a target amount of code of the nth frame is decided so as to become a value that is the result of dividing the residual capacity of an area remaining in the compressed-data storage area by the number of remaining images to be stored in this remaining area. This makes it possible to prevent the target amount of code from becoming very large or very small. Even if there is a change in a photographic scene, therefore, a drastic change in image quality from frame to frame can be prevented.

The invention relates to an ultrasonic instrument mechanical arm and a control method thereof and belongs to a medical device. According to the ultrasonic instrument mechanical arm and the control method thereof, running parameters are sent to an upper computer through a controller, then the upper computer formulates and forms a movement trajectory according to the running parameters and the external input detection requirement, and therefore the upper computer generates a control instruction of driving modules; and then a control unit controls the driving modules to run according to the control instruction. According to the mechanical arm and the control method thereof, compared with the prior art, control is easy, intelligent operation can be achieved, consistency of imaging can be achieved, and the problem that because of the tact difference, the imaging quality is affected is solved. Besides, because the control method of the ultrasonic instrument mechanical arm does not need the control unit to perform lots of calculation, the arithmetic labor of the control unit is reduced, the control efficiency of the control unit is improved, and the reaction speed of the control unit is greatly increased.

The invention discloses a medical image enhancement method, which is realized based on a bidirectional generative adversarial network architecture. The architecture comprises two generator/discriminator pairs, and generator learning converts an image in a low-quality image domain or a high-quality image domain into a corresponding image in the high-quality image domain or the low-quality image domain. A discriminator distinguishes a real image in a low-quality image domain or a high-quality image domain from an image converted from the real image in the high-quality image domain or the low-quality image domain, the architecture introduces constraint terms in an objective function of a bidirectional generative adversarial network, and the constraint terms include an illumination regularization term and a structure loss term. The invention provides a novel medical image enhancement frame, and the imaging quality of the medical image is improved.

The invention provides an image processing device and an image processing method. The image processing device comprises at least one image capturing device and a processor. The processor receives the first image and the second image from the image capturing device and identifies an overlapping region between the first image and the second image. The processor analyzes the overlapping region to obtain a plurality of feature points, a first optical flow adjustment region and a second optical flow adjustment region, dividing the first optical flow adjustment area and the second optical flow adjustment area into a plurality of triangular blocks by using the feature points as vertexes, the corresponding triangular blocks in the first and second optical flow adjusted regions are mixed to form a stitched region, and the stitched region and a plurality of non-overlapping regions in the first and second images are combined to generate a stitched image. Therefore, the operation complexity is greatly reduced, the better image quality can be achieved, and the method is suitable for various real-time applications such as real-time operation of image splicing, three-dimensional image and image generation.

The invention provides an optical anti-shake device for motion compensation by adopting a mobile image sensor chip and electronic equipment, and the optical anti-shake device comprises the image sensor chip, a carrier plate, an elastic conductive part, a lower substrate and a shape memory alloy driving assembly; the image sensor chip is fixedly arranged on the carrier plate, and the carrier plate realizes electrical conduction and signal transmission with an external circuit of the lower substrate through connection of the elastic conductive piece and a capacitive coupling mode; the image sensor chip is driven by the shape memory alloy driving assembly to move in the X direction and the Y direction and rotate in the plane so as to carry out motion compensation. The optical anti-shake device and the electronic equipment thereof provided by the invention are simple in structure, simple in manufacturing process, and capable of improving the product yield, reducing the manufacturing cost, improving the reliability and improving the image quality.

The invention discloses a hysteresis modeling and end-to-end compensation method based on a gating cycle unit. Nonlinearity, memory characteristics and frequency correlation of the hysteresis effect are fully considered, a double-layer structure hysteresis model including a gating cycle unit and a back propagation neural network is designed, and complex characteristics of the hysteresis effect areaccurately described. Aiming at the problem of atomic force microscope imaging distortion caused by a hysteresis effect, the hysteresis model established by the invention is utilized to calculate theactual position of a scanning point in the forward and reverse scanning processes, and a more real sample morphology image is obtained by designing an improved Hermite interpolation method. Experimental results show that the hysteresis model established by the method is high in precision and strong in generalization ability, nonlinearity, memory characteristics and frequency correlation of the hysteresis effect of the piezoelectric actuator can be accurately simulated, and image distortion caused by the hysteresis effect can be effectively eliminated by utilizing a compensation algorithm designed by the model, so that the imaging quality of the atomic force microscope is improved.

The embodiment of the invention provides a camera module and a mobile terminal, the camera module comprises a first camera, a second camera and an image fusion unit, the first camera comprises a first lens group, a first light filtering device and a first image sensor which are sequentially arranged from an object side to an image side; the first light filtering device is used for transmitting near-infrared light to the first image sensor; the second camera comprises a second lens group, a second light filtering device and a second image sensor which are sequentially arranged from the object side to the image side, and the second light filtering device is used for transmitting visible light to the second image sensor; and the image fusion unit is electrically connected with the first image sensor and the second image sensor and is used for performing fusion processing on the image signals output by the first image sensor and the second image sensor to obtain a fused image. The camera module provided by the embodiment of the invention has the photosensitive capability for near-infrared light, can realize a defogging imaging effect, obtains a fused image with clear image quality, and improves the quality of the shot image.

Embodiments of the invention provide a virtual distortion image generation method and device, and relates to the technical field of virtual reality. The method comprises the following steps: determining a to-be-rendered color parameter of each pixel point in an image plane of a virtual camera, wherein the to-be-rendered color parameter is obtained by mapping each virtual object in a three-dimensional simulation scene into an image plane under the condition that camera distortion does not exist; determining a distortion pixel point corresponding to each pixel point in the image plane based on a distortion parameter corresponding to a camera distortion type; and rendering the color parameter of each pixel point into the to-be-rendered color parameter of the distorted pixel point corresponding to each pixel point to obtain the virtual distortion image. Compared with the prior art, by applying the scheme provided by the embodiment of the invention, pixel loss in the virtual distortion image can be avoided, and image quality is improved.