Abstract: An image capture method, an image display method, and an apparatus are provided to reduce a difference between an image displayed on a display end and an image displayed on a capture end. During encoding, the capture end transmits data for describing a luminance mapping relationship between a before-compression image and an after-compression image to the display end, so that consistency between the image on the capture end and the image on the display end is ensured as much as possible. In addition, screen related information for describing luminance of the capture end is transmitted to the display end, so that the display end adjusts backlight and a pixel value based on the screen related information, to improve consistency between the image on the capture end and the image on the display end.

Abstract: A dynamic range mapping method and apparatus for a panoramic video that relate to the field of video image processing are provided.

Abstract: An air purifier is disclosed, comprising a base and a hair collection bin disposed near the bottom of the base. The base is provided with a mounting cavity and an opening in communication with the mounting cavity, and the hair collection bin is slidably disposed within the mounting cavity through the opening. The hair collection bin is provided with a first air inlet and a hair collection chamber in communication with the first air inlet and the mounting cavity. The base is provided with at least one second air inlet in communication with the hair collection chamber. By arranging the hair collection bin near the bottom of the base, disposing the first air inlet and second air inlet in the bottom of the base, a high-efficiency capture of ground hair, dander and other debris by the air purifier is achieved.

Abstract: A direct current to direct current conversion circuit includes: an input end, a first flying capacitor, a second flying capacitor, a power inductor, a first state switch, a second state switch, and an output end; when the first state switch is turned on, and the second state switch is turned off, the input end, the first flying capacitor, the power inductor, the second flying capacitor and the output end are connected, the power inductor and the second flying capacitor supply power to the output end, and the first flying capacitor and the chip inductance are charged; and when the first state switch is turned off, and the second state switch is turned on, the first state flying capacitor, the power inductor, the second flying capacitor and the output are connected, the power inductor and the flying capacitor supply power to the output end, and the second flying capacitor is charged.

Abstract: An intraoral sensor comprising a clamp and a motor-sensor unit. The clamp comprising an upper portion and a lower portion. The lower portion comprising a plurality of holes for receiving forceps tips, a first opening and a second opening, and an engagement portion for contacting an implant. The motor-sensor unit comprising a force generator, a sensor, and a clip connecting the force generator and the sensor. The intraoral sensor is configured to be retained on the implant to generate a measurement of implant stability. The first portion of the motor-sensor unit is received in the first opening of the lower portion of the clamp. The second portion of the motor-sensor unit is received in the second opening of the lower portion of the clamp. The motor-sensor unit is removably connected to the clamp.

Abstract: Embodiments of this application provide a video encoding method, a video decoding method, and an apparatus. The video encoding apparatus may obtain source data, where the source data includes first high dynamic range HDR data and a first standard dynamic range SDR bitstream for same video data; map reconstructed data of the first SDR bitstream to second HDR data based on a correspondence between the reconstructed data of the first SDR bitstream and the first HDR data; determine a target residual value between the second HDR data and the first HDR data, where a bit width of the target residual value is less than or equal to a data bit width for encoding a first SDR video into the first SDR bitstream; encode the correspondence and the target residual value, to determine preset data; and transmit the first SDR bitstream to which the preset data is added.

Abstract: This application provides an image dynamic range processing method and apparatus. The method includes: obtaining a first coordinate value of a first interpolation point and a first coordinate value of a third interpolation point related to a first cubic spline curve; and determining, based on histogram information of a first luminance interval of a to-be-processed image, a first coordinate value of a second interpolation point related to the first cubic spline curve. The first luminance interval is an interval between the first coordinate value of the first interpolation point and the first coordinate value of the third interpolation point. The first coordinate value of the first interpolation point, the first coordinate value of the second interpolation point, and the first coordinate value of the third interpolation point are used to determine a function of the first cubic spline curve.

Abstract: An image processing method and apparatus, wherein the method includes: performing image processing on a first double-layer bitstream, and outputting a second double-layer bitstream. The first double-layer bitstream includes first encoded data representing a first base image and second encoded data representing a first enhancement image. The second double-layer bitstream includes third encoded data representing a second base image and fourth encoded data representing a second enhancement image. The first base image and the first enhancement image are used to obtain a first composite image, the second base image and the second enhancement image are used to obtain a second composite image, and a difference between the first composite image and the second composite image relates to an image processing operation.

Abstract: This disclosure provides an encoding method, a decoding method, and a related device. The method includes: obtaining a first HDR image and N pieces of first base-layer data corresponding to the first HDR image; determining N pieces of first enhancement-layer data based on the first HDR image, the N pieces of first base-layer data, and at least one encoding scheme, where N is a positive integer greater than or equal to 1; and encoding the N pieces of first enhancement-layer data, the N pieces of first base-layer data, and first metadata to obtain a bitstream, where the first metadata includes first indication information, and the first indication information indicates the at least one encoding scheme or a decoding scheme corresponding to the at least one encoding scheme. The foregoing technical solution can implement flexible format conversion, improving encoding efficiency and final synthesis effect.

Abstract: This disclosure provides an image processing method and a related device. The method includes: obtaining first base-layer data, first enhancement-layer data, and first metadata, where the first base-layer data is base-layer data corresponding to a first HDR image, and the first enhancement-layer data is enhancement-layer data corresponding to the first HDR image; performing conversion on target data according to the first metadata, to obtain target conversion data, where the target data is the first base-layer data and/or the first enhancement-layer data; and determining a second HDR image based on the target conversion data. Based on the foregoing technical solution, a more efficient and proper encoding scheme can be selected for the base-layer data and/or the enhancement-layer data, so that the finally synthesized HDR image has a higher restoration degree and is more adaptive to a display device.

Abstract: This disclosure provides an image display method and apparatus. The method includes: obtaining a double-layer bitstream including first encoded data, second encoded data, and metadata; obtaining a base image and an enhancement image based on the first encoded data and the second encoded data; merging the base image and the enhancement image, to obtain a composite image; performing tone mapping on the composite image based on first tone mapping information, to obtain a first target image, where the first tone mapping information is determined based on the metadata and first display information of an electronic device; and displaying the first target image. In this way, an image display method applicable to a double-layer bitstream is provided, and tone mapping information applicable to a current display capability of the electronic device can be determined, to obtain a target image that meets a current display requirement of the electronic device.

Abstract: A signal processing method provided in this application includes: obtaining a first baseline image, a first gain map, and metadata, where the first baseline image corresponds to a first dynamic range; processing the first baseline image based on the metadata to obtain a second baseline image; and obtaining a target image based on the second baseline image and the first gain map, where the target image corresponds to a second dynamic range, and the second dynamic range is different from the first dynamic range. The solutions provided in this application are compatible with image encoding and processing in a plurality of formats, and comparatively good image quality can be achieved on systems with different support capabilities.

Abstract: This application provides an encoding method, a decoding method, and a related device. The encoding method includes: obtaining a first HDR image and first base layer data corresponding to the first HDR image; determining first intermediate enhancement layer data based on the first HDR image and the first base layer data; processing the first intermediate enhancement layer data based on a first mapping relationship, to obtain first enhancement layer data; and encoding the first base layer data, the first enhancement layer data, and first metadata, to obtain a bitstream. In the foregoing technical solution, the encoded first enhancement layer data is determined based on the first mapping relationship. The to-be-encoded data can be flexibly processed based on the first mapping relationship. This can improve encoding efficiency.

Abstract: The present disclosure relates generally to the field of video processing, and more particularly, to high dynamic range (HDR) image processing. In particular, the present disclosure relates to a method for determining a parameter set for a tone mapping curve. The method comprises obtaining a plurality of parameter sets, wherein each parameter set defines the tone mapping curve, and wherein each parameter set is derived based on one of a plurality of HDR video frames. Further, the method comprises temporally filtering the plurality of parameter sets to obtain a temporally filtered parameter set.

Abstract: Tone mapping methods and apparatus provide for receipt by a backend device may of metadata and an HDR image from a frontend device and the generation of a mapping curve based on feature parameters of the mapping curve included in the metadata. Tone mapping on the HDR image can be performed based on the mapping curve. The feature parameters of the mapping curve are determined by the frontend device based on a luminance distribution status of the HDR image. In this way, the mapping curve parameters are determined based on the luminance distribution status of the HDR image so that design of the mapping curve is more flexible, and display effect of the HDR image can be effectively improved.

Abstract: This application relates to the field of image processing technologies, and discloses an image processing method and system, and a device, to resolve a problem that tone mapping greatly affects perception of a binocular 3D image. Based on a disparity map of a binocular image, a tone mapping curve is determined for a display device to display an image, instead of being generated merely based on image content. This makes a contrast of a tone mapped binocular image reach at least a level before tone mapping, thereby meeting a minimum disparity variation requirement for 3D perception by human eyes, and improving 3D perception of a 3D image displayed by the display device.

Abstract: This application provides an image dynamic range processing method and apparatus. The method includes: obtaining a first coordinate value of a first interpolation point and a first coordinate value of a third interpolation point related to a first cubic spline curve; and determining, based on histogram information of a first luminance interval of a to-be-processed image, a first coordinate value of a second interpolation point related to the first cubic spline curve. The first luminance interval is an interval between the first coordinate value of the first interpolation point and the first coordinate value of the third interpolation point. The first coordinate value of the first interpolation point, the first coordinate value of the second interpolation point, and the first coordinate value of the third interpolation point are used to determine a function of the first cubic spline curve.

Abstract: This application provides a tone mapping method and apparatus. In the method, tone mapping is performed on a to-be-displayed image based on reference information and terminal device information of a corresponding type. The reference information includes at least one of a reference display device size, a reference viewing distance, a reference viewing angle, reference ambient light luminance, or reference display device resolution. The terminal device information includes at least one of a terminal display screen size, a user viewing distance, a user viewing angle, ambient light luminance, or terminal display device resolution. In embodiments of this application, when tone mapping is performed on the image, other information such as the terminal display screen size and the user viewing distance is also considered, to flexibly adapt to different environments and display devices, thereby effectively improving display adaptation effect.

Abstract: The present disclosure relates generally to the field of video processing, and more particularly, to high dynamic range (HDR) image processing. In particular, the present disclosure relates to a method for determining a parameter set for a tone mapping curve. The method comprises obtaining a plurality of parameter sets, wherein each parameter set defines the tone mapping curve, and wherein each parameter set is derived based on one of a plurality of HDR video frames. Further, the method comprises temporally filtering the plurality of parameter sets to obtain a temporally filtered parameter set.

Abstract: This disclosure provides a tone mapping method and apparatus. In the method, after global tone mapping is performed on a to-be-displayed image, local mapping information is adjusted to obtain the adjusted local mapping information; and based on the adjusted local mapping information, local tone mapping is performed on at least some pixels in the to-be-displayed image on which global tone mapping is performed. In embodiments of this disclosure, a global and local joint tone mapping solution is used, and local mapping is performed based on the adjusted local mapping information, to balance an uncoordinated contrast between different regions in local tone mapping, and effectively improve tone mapping effect and display effect of an image.