US 2018/0122056 A1 · IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, PROGRAM, RECORDING MEDIUM RECORDING THE PROGRAM, IMAGE CAPTURE DEVICE AND IMAGE RECORDING/REPRODUCTION DEVICE

Abstract

An image processing device (100) includes: a reduction processor (1) that generates reduced image data (D1) from input image data (DIN); a dark channel calculator (2) that performs a calculation which determines a dark channel value (D2) in a local region throughout a reduced image by changing a position of the local region, and outputs a plurality of dark channel values as a plurality of first dark channel values (D2); a map resolution enhancement processor (3) that performs a process of enhancing resolution of a first dark channel map constituted by the plurality of first dark channel values (D2), thereby generating a second dark channel map constituted by a plurality of second dark channel values (D3); and a contrast corrector (4) that generates corrected image data (DOUT) on the basis of the second dark channel map and the reduced image data (D1).

Claims19

Dependent claims

1-20. (canceled)

An image processing device comprising:

a reduction processor that performs a reduction process on input image data which is data of an input image, thereby generating reduced image data;
a haze feature quantity calculator that performs a calculation which determines a value of a haze feature quantity indicating density of haze in a local region which includes an interested pixel in a reduced image based on the reduced image data, performs the calculation throughout the reduced image by changing a position of the local region, and outputs a plurality of haze feature quantity values obtained from the calculation as a plurality of first haze feature quantity values;
a map resolution enhancement processor that performs a process of enhancing resolution of a first haze feature quantity map including the plurality of first haze feature quantity values by using the reduced image as a guide image, thereby generating a second haze feature quantity map including a plurality of second haze feature quantity values;
and
a contrast corrector that performs a process of correcting contrast in the input image data on a basis of the second haze feature quantity map and the reduced image data, thereby generating corrected image data.

2 more elements

An image processing device comprising:

a reduction processor that performs a reduction process on input image data which is data of an input image, thereby generating reduced image data;
a haze feature quantity calculator that performs a calculation which determines a value of a haze feature quantity indicating density of haze in a local region which includes an interested pixel in a reduced image based on the reduced image data, performs the calculation throughout the reduced image by changing a position of the local region, and outputs a plurality of haze feature quantity values obtained from the calculation as a plurality of first haze feature quantity values;
and
a contrast corrector that performs a process of correcting contrast in the input image data on a basis of a first dark channel map including the plurality of first haze feature quantity values, thereby generating corrected image data;
wherein the contrast corrector includes:
an airglow estimation unit that estimates an airglow component in the reduced image data on a basis of the first haze feature quantity map and the reduced image data;
a transmittance estimation unit that generates a first transmission map in the reduced image on a basis of the reduced image data and the airglow component;
a map resolution enhancement processing unit that performs a process of enhancing resolution of the first transmission map by using the reduced image as a guide image, thereby generating a second transmission map of which resolution is higher than the resolution of the first transmission map;
a transmission map enlargement unit that performs a process of enlarging the second transmission map, thereby generating a third transmission map;
and
a haze removal unit that performs, on the input image data, a haze removal process of correcting a pixel value of the input image based on the input image data on a basis of the third transmission map and the airglow component, thereby generating the corrected image data.

8 more elements

An image processing method comprising:

a reduction step of performing a reduction process on input image data which is data of an input image, thereby generating reduced image data;
a calculation step of performing a calculation which determines a value of a haze feature quantity indicating density of haze in a local region which includes an interested pixel in a reduced image based on the reduced image data, performing the calculation throughout the reduced image by changing a position of the local region, and outputting a plurality of haze feature quantity values obtained from the calculation as a plurality of first haze feature quantity values;
a map resolution enhancement step of performing a process of enhancing resolution of a first haze feature quantity map including the plurality of first haze feature quantity values by using the reduced image as a guide image, thereby generating a second haze feature quantity map including a plurality of second haze feature quantity values;
and
a correction step of performing a process of correcting contrast in the input image data on a basis of the second haze feature quantity map and the reduced image data, thereby generating corrected image data.

2 more elements

Dependencies are inferred from the claim text.

Image processing device, image processing method, program, recording medium recording the program, image capture device and image recording/reproduction device

Life of this patent

Image processing device, image processing method, program, recording medium recording the program, image capture device and image recording/reproduction device

Life of this patent

Abstract

Claims19