206 results about "Dynamic range compression" patented technology

The present invention provides an image processing method. In one embodiment, the method provides discontinuity-preserving image smoothing and segmentation, noise reduction, reduction of image variations particularly those variations caused by illumination conditions, exposure compensation, and dynamic range compression. The present invention also provides an electronic image sensor that is able to detect high dynamic range optical images and produce electronic images with reduced dynamic range.

Electronic displays are provided which can reproduce image data with high contrast ratios and a gray scale range comparable to conventional X-ray film viewed on a light box. One such display includes a rear low-resolution LCD or DLP display which projects an image onto a high-resolution LCD display. In such embodiments, the mechanical and optical registration between the two displays is not critical. Therefore, modulation transfer function and distortion of the projection optics are not critical. Accordingly, the brightness of the inventive display can be maximized with high power lamps and high aperture projection optics. Because the display has a high dynamic range, the need for dynamic range compression algorithms is reduced.

An imaging apparatus appropriately captures a large dynamic range image of even a scene including a backlit person with a blue sky background in a manner that the person's face has an appropriate luminance level without saturating the background sky. In the imaging apparatus, an imaging unit obtains analogue image signals through exposure control that prevents a highlight from being saturated, an A / D converter converts the analogue image signals to digital image signals, and a signal processing unit linearly increases the dynamic range of the digital image signals. The image signals with the increased dynamic range are nonlinearly compressed to have a dynamic range of 100% or less through nonlinear dynamic range compression that intensively compresses a highlight portion. The imaging apparatus with this structure first increases the dynamic range of an image and efficiently compresses the increased large dynamic range of the image.

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

Method and system for generating output signals for reproduction by two physical speakers in response to input audio signals indicative of sound from multiple source locations including at least two rear locations. Typically, the input signals are indicative of sound from three front locations and two rear locations (left and right surround sources). A virtualizer generates left and right surround outputs useful for driving front loudspeakers to emit sound that a listener perceives as emitting from rear sources. Typically, the virtualizer generates left and right surround outputs by transforming rear source inputs in accordance with a head-related transfer function. To ensure that virtual channels are well heard in the presence of other channels, the virtualizer performs dynamic range compression on rear source inputs. The dynamic range compression is preferably accomplished by amplifying rear source inputs or partially processed versions thereof in a nonlinear way relative to front source inputs.

The invention provides an image processing method and image processing equipment. The image processing method comprises the following steps of acquiring at least three continuously shot images with different exposure degrees by using mobile equipment; processing the images on the basis of high-dynamic range illumination rendering; and fusing image processing results into a result graph. By using the imaging processing method and the image processing equipment, the problem that the information of images shot by using the mobile equipment is lost due to compression of a dynamic range can be solved, ghost images caused by shaking of hands of a photographer are eliminated, and the trueness of the images is kept to a great extent.

An electronic apparatus with haptic feedback and a method for providing haptic feedback are provided. The method includes the following steps. An actuation unit is provided to generate haptic feedback. In response to at least a haptic command, a control value is dynamically generated to control the actuation unit to generate haptic feedback, wherein dynamic range compression is applied to dynamically generate the control value so as to control the magnitude of haptic feedback to be substantially within a vibration range.

An electronic apparatus with haptic feedback and a method for providing haptic feedback are provided. The method includes the following steps. An actuation unit is provided to generate haptic feedback. In response to at least a haptic command, a control value is dynamically generated to control the actuation unit to generate haptic feedback, wherein dynamic range compression is applied to dynamically generate the control value so as to control the magnitude of haptic feedback to be substantially within a vibration range.

In an image pickup apparatus, a level compensator compensates the level of an image xL (i, j) sensed by an image sensor by exposure for a long time on the basis of the exposure of the image to produce a compensated image xL′ (i, j), while another level compensator compensates the level of an image xS (i, j) sensed by the image sensor by exposure for a short time on the basis of the exposure of the image to produce a compensated image xS′ (i, j). The image pickup apparatus also includes an image synthesizer to synthesize these compensates images xL′ (i, j) and xS′ (i, j) to produce a single synthetic image x (i, j). A dynamic range compressor also included in the image pickup apparatus compresses the synthetic image x (i, j) to produce a compressed image y (i, j) for delivery to outside.

Mitigation of nonlinear echoes by dynamic range compression may be provided. An audio output may be evaluated to determine whether nonlinear echoes are interfering with an audio signal. In order to reduce such nonlinear echoes, a dynamic range compression algorithm may be applied to the audio signal prior to output. The signal may be modified according to a compression wave and / or subjected to an attenuation factor.

The invention relates to an audio signal processing method and an audio signal processing device for restoring a signal under speaker cut-off frequency to the original sound, which aim to extend the equivalent sound range of a small-sized speaker and enhance the expression of low sound. A virtual low-sound harmonic wave sequence is generated by a feedforward self-multiplication operation method and singly by the grain corresponding to each harmonic wave respectively, so that the proportion of the harmonic waves can be freely controlled and the tone can be controlled; the gain applied to the virtual low-sound signal is adjusted by a virtual low-sound signal sound-type control method and according to the impacting process and the releasing process to control the sound types of the virtual low-sound signal so as to control the hearing feeling of the final sound signal according to requirements to make the sound from 'knocking' more abundant; and the virtual low-sound signal processing effect is enhanced by combining techniques such as a low-sound dynamic range compression technique, a power conservation filter technique, a low-sound signal frequency redivision technique and the like, even if under high speaker cut-off frequency, the quality of the original low sound can still be restored by effectively restoring the virtual low-sound signal.

The invention provides an electronic device with tactile feedback and a method for providing tactile feedback. The method comprises providing a vibration unit to generate tactile feedback; and dynamically generating a control value in response to at least one tactile command to control the vibration unit to generate tactile feedback, wherein the control value is dynamically generated by applying dynamic range compression treatment to control the magnitude of tactile feedback substantially in a vibration range.

The embodiment of the invention discloses an image compression and detail enhancement method for an infrared image. The image compression and detail enhancement method for the infrared image comprises the following steps: obtaining an original infrared image; decomposing the original infrared image into a base map partial image and a detail partial image; carrying out dynamic range compression on the base map partial image to obtain a compression base map partial image; removing stripe noise in the detail partial image, and carrying out detail enhancement processing to obtain an enhanced detail partial image; and combining the compression base map partial image with the enhanced detail partial image. According to the image compression and detail enhancement method for the infrared image, which is disclosed by the embodiment of the invention, the scene information of a global big dynamic range is reasonably compressed, meanwhile, the detail information of a global small dynamic target is enhanced on the basis of effectively inhibiting the stripe noise, the big dynamic range of the infrared image is compressed, the detail information of the infrared image is kept, and the integral display effect of the image is obviously improved.

A method and apparatus for processing image data is described, comprising acquiring a frame of image data and compressing the dynamic range of the frame of image data using a dynamic range compression (DRC) algorithm that utilizes down-sampling, median filtering, and up-sampling. The DRC algorithm comprises down-sampling a frame of image data comprising a first array of pixels to generate a second array of pixels, applying a first median filter to the second array of pixels to generate a blurred array of pixels, up-sampling the blurred array of pixels, and removing at least a portion of low-frequency gradient data generated by previous steps from the frame of image data.

A system and method are presented for the encapsulation of a protocol stack in a voice telephony processor. Utilizing the system and method disclosed herein, digital voice telephony signals received in TDM frame-based format are converted to packet-based or cell-based format for transmission on a network, and vice-versa. The system and method may be embodied as a functional block within a specialized high-density integrated circuit voice processor. The voice processor employs on-chip digital signal processors (DSPs) to perform echo cancellation, dynamic range compression / expansion, and other processing on voice data. Advantageously, the encapsulation process of the disclosed herein does not impact the throughput of the DSPs. Instead, voice data is reformatted and prefixed with a header for the appropriate protocol layers using a dedicated on-chip packet control processor and linked list data structures managed by indexed direct memory access (DMA) controllers. Thus, data encapsulation has no impact on the signal processing activities.

The invention relates to a method for enhancing details and compressing a dynamic range of an infrared image. The method comprises the following steps: 1, an original infrared image with high dynamic range is resolved into a base graph and a detailed graph through a Gauss constrained filter; 2, performing dynamic saturation extraction and non-linear dynamic range compression on the base graph and the detailed graph; and 3, synthesizing the base graph and the detailed graph and outputting. The method can be used in various infrared focal plane detector imaging systems, is easy for hardware implementation, can be widely applied in the fields of infrared warning systems, infrared night version systems, space infrared imaging study, industrial and civil infrared imaging systems and the like, and provides quick and effective infrared image detail enhancement technical means.

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

A personal microphone that includes a structure having a live-performance form factor, a capsule that converts acoustic energy into an input signal, a signal processor that converts the input signal into a processed output signal, and a microphone output connector. The signal processor has input terminals that receive the input signal and input / output terminals that receive a phantom DC voltage from the microphone output connector while sending the microphone output connector a processed output signal. The signal processor has a dynamic range compressor that compresses the processed output signal, and a programming or adjustment device that sets the signal processor operating parameters. The personal microphone can have a security device for avoiding unwanted changes to the operating parameters of the adjustable signal processor. The personal microphone can be powered by a phantom power supply coupled to the microphone output connector via a mixing console and / or other devices.

A CCD device incorporates Charge Multiplication in its CCD registers together with charge domain Dynamic Range compression. This structure preserves the high dynamic range available in the charge domain of these devices, and avoids limiting it by an inadequate voltage swing of the charge detection nodes and amplifiers. The Dynamic Range compression is logarithmic from a predetermined built in threshold and noiseless. The technique has an additional advantage of maintaining the compact size of the registers, and the registers may also include antiblooming devices to prevent blooming.

A loudspeaker drive circuit uses a dynamic range compressor to implement a non-linear gain function between the input signal to the dynamic range compressor and an output signal from the dynamic range compressor. The output is used to drive a loudspeaker, and the operating parameters of the dynamic range compressor are varied in dependence on a criterion, such as the estimated voice coil temperature, the power consumption or the acoustical distortion.

A hearing application suite includes enhancement and training for listening and hearing of prerecorded speech, extemporaneous voice communication, and non-speech sound. Enhancement includes modification of audio according to audiometric data representing subjective hearing abilities of the user, display of textual captions contemporaneously with the display of the audiovisual content, user-initiated repeating of a most recently played portion of the audiovisual content, user-controlled adjustment of the rate of playback of the audiovisual content, user-controlled dynamic range compression / expansion, and user controlled noise reduction. Training includes testing the user's ability to discern speech and / or various other qualities of audio with varying degrees of quality.

The present invention is a method of processing a digital image that is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value Ii(x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with ∑n=1N⁢Wn⁢(log⁢ ⁢Ii⁢(x,y)-log⁢ [Ii⁢(x,y)*Fn⁢(x,y)]),i=1,…⁢ ,Swhere Wn is a weighting factor, “*” is the convolution operator and S is the total number of unique spectral bands. For each n, the function Fn(x,y) is a unique surround function applied to each position (x,y) and N is the total number of unique surround functions. Each unique surround function is scaled to improve some aspect of the digital image, e.g., dynamic range compression, color constancy, and lightness rendition. The adjusted intensity value for each position in each i-th spectral band of the image is then filtered with a filter function to generate a filtered intensity value Ri(x,y). To prevent graying of white zones in the image, the maximum of the original intensity value Ii(x,y) and filtered intensity value Ri(x,y) is selected for display.

A dynamic range (D-range) compression apparatus that uses a look-up table (LUT) is capable of dynamic compression that compresses the peak input value to the full output range, even when image signals with variable D-ranges are inputted.According to this D-range compression apparatus, D-range compression processing that places the D-range of the image signal within a predetermined output D-range is performed by the visual processing unit converting the tone of the image signal in accordance with the surrounding average luminance signal. Furthermore, with this D-range compression apparatus, the image signal is amplified in accordance with amplification input / output conversion characteristics determined based on the peak value in the image detected by the peak detection unit, and therefore it is possible to perform a dynamic amplification processing in accordance with the peak value so that the D-range of the image signal outputted from the visual processing unit becomes a predetermined output D-range.

The present invention is related to methods and apparatus that can advantageously reduce a peak to average signal level exhibited by single or by multicarrier multibearer waveforms. Embodiments of the invention further advantageously can manipulate the statistics of the waveform without expanding the spectral bandwidth of the allocated channels. Embodiments of the invention can be applied to either multiple carrier or single carrier systems to constrain an output signal within predetermined peak to average bounds. Advantageously, the techniques can be used to enhance the utilization of existing multicarrier RF transmitters, including those found in third generation cellular base stations. However, the peak to average power level managing techniques disclosed herein can apply to any band-limited communication system and any type of modulation. The techniques can apply to multiple signals and can apply to a wide variety of modulation schemes or combinations thereof.

The embodiment of the invention discloses an image detail enhancement method of an infrared image. The image detail enhancement method of the infrared image includes the steps that an original infrared image is acquired; the original infrared image is de-noised; the de-noised infrared image is decomposed into a detail partial image and a base partial image; the detail partial image is processed through detail enhancement; the dynamic range of the base partial image is compressed; the detail partial image and the base partial image are synthesized, and a synthetic infrared image is obtained. According to the image detail enhancement method of the infrared image, on the basis of effectively suppressing noise, the scene information of the global large dynamic range is reasonably compressed, not only is the large dynamic range of the infrared image compressed, but also detail information of the infrared image is kept, and thus the visual effect of the whole image is obviously improved.

The invention is suitable for the field of audio signal processing, and provides a method, an apparatus and a device for audio dynamic range compression. The method comprises the following steps of: regulating a peak value and a mean value of a current audio processing frame by a preset control volume so as to obtain a modified peak value and a modified mean value; when the modified peak value or the modified mean value is not in a target dynamic range, attenuating or progressively increasing the preset control volume for many times to get the modified control volume until realizing that the modified peak value and the modified mean value can be regulated to a range meeting a regulation termination condition by the modified control volume; and regulating the modified peak value and the modified mean value to the range meeting the regulation terminal condition by the modified control volume. In the method, the peak value and the mean value of an audio signal are taken as the detection quantity, and by dynamically regulating the control volume of the audio signal and performing audio dynamic range compression on the audio signal, the loudness and the tone quality of the sound are guaranteed well.

The invention provides a high bit-wide digital image dynamic range compression and detail enhancement method. The method comprises the steps that S1, an image with pixel defective points being filtered is acquired; S2, the image with the pixel defective points being filtered is decomposed to obtain a base image and a detailed image; S3, the detailed image is enhanced and then fused with the base image; S4, the transformation parameter of a self-adaptive transformation function is obtained according to the average value and the mean square deviation of a high bit-wide digital image, and the self-adaptive transformation function is guided to conduct transformation on the fused image. According to the method, high bit-wide digital images with various different scene features are tested to show that the method can improve the image contrast, enhance the image details and achieve dynamic range compression on the basis that the hierarchical structure of the image is kept, and the method is more suitable for human eye observation or machine analysis and processing. The high bit-wide digital image dynamic range compression and detail enhancement method is used for enhancing and reappearing infrared images and other high bit-wide digital images on a PC.

Provided is an image processing apparatus that can effectively display an image by using an optimized dynamic range compression technique and a method of processing an image by using the same. The method includes: obtaining a first blurred image and a second blurred image from the input image; estimating illuminance of the input image by combining the first blurred image and the second blurred image; generating a dark region amplified image from the input image; generating a bright region conserved image from the input image; applying weights to the dark region amplified image and the bright region conserved image, respectively, according to the estimated illuminance; and combining the weighted dark region amplified image and the weighted bright region conserved image to generate a final image.