Image processing device, image processing method, program, print media and recording media

FIELD: physics.

SUBSTANCE: image processing device is proposed comprising, at least, a storage module and a control module. The storage module includes a filter storage unit for storing a set of an approximation filter without an orientation and a filter bank having a degree or wavelet-frame having a degree set for the approximation filter without any orientation and a plurality of detailed filters with corresponding orientations, an image data storage module to store image data. The control module includes a decomposition module for receiving subband signals by performing decomposition for a plurality of resolutions for image data using a set of an approximation filter without an orientation or a filter bank or a wavelet-frame set for an approximation filter.

EFFECT: improving the quality of image processing by using an approximation filter.

24 cl, 57 dwg

 



 

Same patents:

FIELD: information technology.

SUBSTANCE: image processing device includes a first bitmap processing means configured to apply bitmap processing to image data using a first threshold matrix, a second bitmap processing means configured to apply bitmap processing to image data using a second threshold matrix, and a contour detecting means configured to detect a contour portion of an object included in the image data. The image processing device also includes an output means configured to select and output image data obtained through a logic OR operation between image data obtained by the first bitmap processing means, and image data obtained by the second bitmap processing means for a pixel detected by the contour detecting means as belonging to a contour portion, and select and output image data obtained by the first bitmap processing means for a pixel which does not belong to the contour portion.

EFFECT: reducing staircase effect in a contour portion caused by bitmap processing of halftone image data.

11 cl, 12 dwg

FIELD: information technology.

SUBSTANCE: system for correcting dark, light and middle tones on digital images has a module for obtaining the source RGB image, a global contrasting module, a module for converting from the RGB colour system, a bilateral filtration module, a module for determining the gain factor of dark tones, a module for correcting dark tones and a module for converting to the RGB colour system. The system also has a noise filtering module, a module for determining the attenuation factor of light tones, a module for correcting light tones, a module for determining the gain factor of middle tones and a module for correcting middle tones. The output of the module for obtaining the source RGB image is connected to the input of the noise filtering module, the output of which is connected to the input of the global contrasting module, the output of which is connected to the input of the module for converting from the RGB colour system; the output of the module for converting from the RGB colour system for transmission of the brightness channel is connected to the input of the bilateral filtration module, the input of the module for determining the gain factor of dark tones, the input of the module for determining the attenuation factor of light tones, the input of the module for determining the gain factor of middle tones, the third input of the module for correcting dark tones, the third input of the module for correcting light tones and the third input of the module for correcting middle tones. The output of the module for converting from the RGB colour system for transmission of the colour channel is connected to the fourth input of the module for converting to the RGB colour system. The output of the bilateral filtration module is connected to the first input of the module for correcting dark tones, the first input of the module for correcting light tones and the first input of the module for correcting middle tones. The output of the module for determining the gain factor of dark tones is connected to the second input of the module for correcting dark tones, the output of which is connected to the first input of the module for converting to the RGB colour system. The output of the module for determining the attenuation factor of light tones is connected to the second input of the module for correcting light tones, the output of which is connected to the second input of the module for converting to the RGB colour system. The output of the module for determining the gain factor of middle tones is connected to the second input of the module for correcting middle tones, the output of which is connected to the third input of the module for converting to the RGB colour system.

EFFECT: high local contrast in dark, light and middle tones of an image.

10 dwg

FIELD: information technology.

SUBSTANCE: in the method, the size of a structure-forming element is selected equal to one element of a mesh halftone matrix; that size is increased at end points of fragments of the initial contour until the region of the structure-forming element covers the end point of the closest fragment of the initial contour, after which end points are connected by a straight line; the size of the structure-forming element is once more set equal to one element of the mesh halftone matrix and moved to the end point of the next fragment of the initial contour.

EFFECT: eliminating contour abruption on a mesh halftone matrix.

2 dwg

FIELD: information technology.

SUBSTANCE: signal from a defective element is replaced with a signal from a robust element lying on the left side. All defective elements lying in the row, including those lying consecutively, are replaced. Median filtration is applied to the obtained image, where filtration is applied to those elements for which the difference in signal value of the element and the filter median is greater than a threshold value. Said elements are assigned the corresponding median value. The filter is applied for the section of the image based on the threshold tied to the average noise value of the photodetector. The threshold is compared with the difference between the signal value of the central element of the filter mask and the filter median value. The filter threshold selected is proportional to the average noise value of the photodetector and median filtration is carried out with element mask size of (2k+1)×(2k+1), where k is an integer and k≥1, specifically a 3×3 element.

EFFECT: low hardware expenses on compensating for defective photosensitive elements, high quality of thermal image, high reliability of compensating for a defective element independent of contrast of the viewed scene and independence of quality of replacing defective elements from instability of the structure based on solid solution of cadmium or mercury tellurides.

8 cl, 5 dwg, 3 ex

FIELD: physics.

SUBSTANCE: to carry out correction, scene elements are successively picked up by neighbouring photosensitive areas during scanning. The relationship between signals from each element and signals from a neighbouring element is determined in the range of variation of input signals from different scene sections using three-parametre approximation. Said relationship is used to determine correction functions and signals from each next photodetector element are successively corrected relative the previous element so that corrected signals from all elements are identical for identical optical signals in the entire range of scene signals.

EFFECT: wider interval for calibrating scanning multielement photodetectors with correction of non-uniformity based on scene signals.

2 dwg

FIELD: information technology.

SUBSTANCE: position of pulse noise on the image is evaluated first, after which four auxiliary masks are formed, as well as eight control vectors (two vectors based on each auxiliary mask), and coefficients of corresponding four differently aligned Prewitt masks are then changed using given vectors. Further, the given masks are used to calculated the approximate value of the modulus of the image gradient, and contours of the object on the image are obtained through its threshold conversion.

EFFECT: higher sensitivity of the noise-immune gradient method of detecting contours to useful contour features of the image.

5 dwg

FIELD: physics; image processing.

SUBSTANCE: invention relates to image processing methods, and particularly to smoothing jagged edges on digital images. Proposed is a method for determining and smoothing jagged edges on an image in which values of initial intensity and coordinates of the image pixels are stored; a first area is selected around the current pixel, where the area consists of several neighbouring image pixels; two lines are selected, one of which passes horizontally and the other vertically through the current pixel and pixels of the first area; the horizontal auxiliary gradient along the horizontal line of the first area is determined as a difference between the pixel lying on the left of the current pixel and the pixel lying on the right of the current pixel; the vertical auxiliary gradient along the vertical line of the first area is determined as the difference between the pixel lying above the current pixel and the pixel lying below the current pixel; the sum of absolute values of the horizontal and vertical gradients is determined; it is determined that, the first area is not a high-frequency area, and for each pixel of the first area, the horizontal gradient along the horizontal line of the first area and the vertical gradient along the selected vertical line of the first area is determined; four correlation matrices for corresponding gradients of areas are determined, as well as eigen vectors θ-, θ+ and eigen values λ-, λ+ of the correlation matrix. The overall intensity of the current pixel is determined as a weighted sum of the initial intensity of the current pixel with coefficient (1-w) with approximated intensity of the current pixel on the Dir_edge direction with coefficient w.

EFFECT: faster processing of noisy images in real time and improved quality of correcting jagged edges.

11 cl, 1 dwg

FIELD: physics, image processing.

SUBSTANCE: invention is related to systems and methods for scanning and copying with correction of distortions. Result is achieved by the fact that scanning and copying system comprises the following components connected to each other by means of data bus: scanner, the first camera, the second camera, processor, program memory, data memory and external device, moreover, scanner has bottom layer, on which object is placed and along which object is scanned, the first and second cameras are installed at opposite lateral sides of scanner across object bending line in binding, and lenses of cameras are arranged at the lateral side of object, directly across binding ends, besides cameras are arranged with the possibility to produce object pictures from the lateral sides in the area of pages curve near binding, program memory comprises facility for establishment of correction made with the possibility to establish parametres and method of image correction, processor has module of distortion correction made with the possibility to create three-dimensional model of scanned object surface on the basis of data that characterise shape of object page curve near binding, analysis of each scanned line of object image, and when required, correction of distortions in each scanned line with application of scanned surface three-dimensional model data.

EFFECT: improved accuracy in definition of object distortion areas near binding.

28 cl, 15 dwg

FIELD: physics; image processing.

SUBSTANCE: present invention can be used, for instance, in resolution transformation. In the device and method for processing images, gradient direction v1 of the edges with the largest gradient of pixel values is detected, as well as direction v2 of the edges, orthogonal to the gradient direction v1 of the edges. Processing is done for improving and smoothing out in the gradient direction v1 and direction v2 of the edges, respectively, so as to generate image output data D2.

EFFECT: prevention of loss of high-frequency components and appearance of stepped images.

10 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: invention relates to digital photography, more specifically to analysis of digital image quality. The method of detecting distortions caused by Gibbs effect in JPEG coding involves evaluation of the size of the coding unit with relative the given resolution of the printing device; determination for each coding unit, whether the size of the unit makes it distinctive to the human eye with the required printing resolution, of the approximate metric of distortion distinctiveness, caused by Gibbs effect; setting to zero corresponding elements of the approximate metric of distortion distinctiveness, caused by Gibbs effect if their values are below the preferred threshold; calculation for zero elements of the approximate metric of distortion distinctiveness, caused by Gibbs effect, of the corresponding distortion dispersion; dispersion is zeroed for the rest of the elements.

EFFECT: invention can be used in detecting distortions during JPEG coding.

4 cl, 6 dwg

FIELD: physics, video.

SUBSTANCE: invention relates to video encoding/decoding techniques which employ a loop filter which reduces blocking noise. The technical result is achieved due to that a video encoding/decoding device, which encodes or decodes video using a loop filter, includes a deviation calculating unit which calculates deviation between a target noise cancellation pixel and a neighbouring pixel of the target pixel using a decoded image. A pattern form establishing unit limits the pattern form such that the less the deviation from the maximum deviation in the decoded image, the smaller the pattern form. When removing target pixel noise, using a weight coefficient in accordance with the degree of similarity between the pattern of the target pixel and the pattern of each search point in the form of a search and a weighted sum of pixel values at search points, the loop filter compares patterns using the limited pattern form and removes the target pixel noise.

EFFECT: reduced computational complexity of the noise cancellation filter, thereby preventing deterioration of encoding efficiency.

5 cl, 19 dwg

FIELD: information technology.

SUBSTANCE: device includes an input lens, a memory unit, a bus, a video sensor, a movement estimation unit, a frequency divider and video sensor resolution selection unit, a unit for single-step enhancement of the whole frame, a clock frequency generator unit, a unit for selecting faces of people, a unit for iterative enhancement faces of people, an image combining unit and a conflict resolver.

EFFECT: high quality of facial images contained in frames of an input video sequence, high quality of moving and fixed regions of the image by increasing spatial resolution of the image and reducing the blurring effect arising from relative movement of the imaging device and the captured scene.

2 dwg

FIELD: information technologies.

SUBSTANCE: method includes performance of the following operations: digital copy of initial printed document is produced in colour space of RGB, brightness difference is detected, and direction of maximum gradient is determined, current count of image is classified for its affiliation to area of brightness difference or uniform area without sharp changes of brightness, Gauss smoothening of current count is made, if it is classified as belonging to uniform area without sharp changes of brightness, current count is smoothened in anisotropic manner, if it is classified as belonging to the area of brightness difference.

EFFECT: invention makes it possible to carry out fast single-stage descreening of screen-type pattern images with preservation of contour differences and increased accuracy.

5 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: first band pass (BP) is determined based on initial image data; a matrix of filter coefficients (FC) is calculated to obtain frequency characteristics corresponding to limitation of frequency band (FB) using the first BP; data of the first filtered image are generated by filtering data of the initial image using the matrix of first FC; an estimate value of the objective image quality of data of the first filtered image is obtained and the distribution coefficient (DC) is calculated, which is used to determine the optimum BP based on the estimate value of objective image quality; the optimum BP corresponding to the calculated DC is determined using a table in which the corresponding relationship between DC and optimum BP is defined; a matrix of optimum FC is calculated to obtain frequency characteristics corresponding to limitation of FB using the optimum BP; and data of the optimally filtered image is generated by filtering data of the initial image using the matrix of optimum FC.

EFFECT: adaptive image filtering process for providing high-quality image.

3 cl, 11 dwg

FIELD: physics; image processing.

SUBSTANCE: present invention can be used, for instance, in resolution transformation. In the device and method for processing images, gradient direction v1 of the edges with the largest gradient of pixel values is detected, as well as direction v2 of the edges, orthogonal to the gradient direction v1 of the edges. Processing is done for improving and smoothing out in the gradient direction v1 and direction v2 of the edges, respectively, so as to generate image output data D2.

EFFECT: prevention of loss of high-frequency components and appearance of stepped images.

10 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: pixels data of the current video sequence frame is recorded to the buffer of current frame, and the pixels data of the previous video sequence frame is recorded to the buffer of previous frame; motion between current and previous video sequence frames is determined in the differences calculation block; the calculated motion between previous and current frames is recorded to the motion data buffer; the data from the current frame buffer is recorded to the previous frame buffer; partial derivatives for every channel of the current frame are determined in the partial derivative calculation blocks for X-direction and Y-direction; spatial averaging of directional derivatives for each channel of the current frame, as well as channels smoothing in the first and the second smoothing blocks are performed; direction of the edge for every pixel position of the current frame is calculated in the arctangent calculator; anisotropic filter for every pixel position of the current frame is formed and recorded to the memory of filter values; anisotropic filtering of all pixels of the current frame, their motion exceeding predefined limit in the anisotropic filtering block, is done.

EFFECT: increased quality of dynamic video picture due to changes in anisotropic filtering with adaptive mask.

7 cl, 2 dwg

FIELD: information technology.

SUBSTANCE: pixels data of the current video sequence frame is recorded to the buffer of current frame, and the pixels data of the previous video sequence frame is recorded to the buffer of previous frame; motion between current and previous video sequence frames is determined in the differences calculation block; the calculated motion between previous and current frames is recorded to the motion data buffer; the data from the current frame buffer is recorded to the previous frame buffer; partial derivatives for every channel of the current frame are determined in the partial derivative calculation blocks for X-direction and Y-direction; spatial averaging of directional derivatives for each channel of the current frame, as well as channels smoothing in the first and the second smoothing blocks are performed; direction of the edge for every pixel position of the current frame is calculated in the arctangent calculator; anisotropic filter for every pixel position of the current frame is formed and recorded to the memory of filter values; anisotropic filtering of all pixels of the current frame, their motion exceeding predefined limit in the anisotropic filtering block, is done.

EFFECT: increased quality of dynamic video picture due to changes in anisotropic filtering with adaptive mask.

7 cl, 2 dwg

FIELD: physics; image processing.

SUBSTANCE: present invention can be used, for instance, in resolution transformation. In the device and method for processing images, gradient direction v1 of the edges with the largest gradient of pixel values is detected, as well as direction v2 of the edges, orthogonal to the gradient direction v1 of the edges. Processing is done for improving and smoothing out in the gradient direction v1 and direction v2 of the edges, respectively, so as to generate image output data D2.

EFFECT: prevention of loss of high-frequency components and appearance of stepped images.

10 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: first band pass (BP) is determined based on initial image data; a matrix of filter coefficients (FC) is calculated to obtain frequency characteristics corresponding to limitation of frequency band (FB) using the first BP; data of the first filtered image are generated by filtering data of the initial image using the matrix of first FC; an estimate value of the objective image quality of data of the first filtered image is obtained and the distribution coefficient (DC) is calculated, which is used to determine the optimum BP based on the estimate value of objective image quality; the optimum BP corresponding to the calculated DC is determined using a table in which the corresponding relationship between DC and optimum BP is defined; a matrix of optimum FC is calculated to obtain frequency characteristics corresponding to limitation of FB using the optimum BP; and data of the optimally filtered image is generated by filtering data of the initial image using the matrix of optimum FC.

EFFECT: adaptive image filtering process for providing high-quality image.

3 cl, 11 dwg

FIELD: information technologies.

SUBSTANCE: method includes performance of the following operations: digital copy of initial printed document is produced in colour space of RGB, brightness difference is detected, and direction of maximum gradient is determined, current count of image is classified for its affiliation to area of brightness difference or uniform area without sharp changes of brightness, Gauss smoothening of current count is made, if it is classified as belonging to uniform area without sharp changes of brightness, current count is smoothened in anisotropic manner, if it is classified as belonging to the area of brightness difference.

EFFECT: invention makes it possible to carry out fast single-stage descreening of screen-type pattern images with preservation of contour differences and increased accuracy.

5 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: device includes an input lens, a memory unit, a bus, a video sensor, a movement estimation unit, a frequency divider and video sensor resolution selection unit, a unit for single-step enhancement of the whole frame, a clock frequency generator unit, a unit for selecting faces of people, a unit for iterative enhancement faces of people, an image combining unit and a conflict resolver.

EFFECT: high quality of facial images contained in frames of an input video sequence, high quality of moving and fixed regions of the image by increasing spatial resolution of the image and reducing the blurring effect arising from relative movement of the imaging device and the captured scene.

2 dwg

Up!