Image details processing method, apparatus, terminal, and storage medium

Patent metadata

Field	Value
Publication number	US-10791307-B2
Application number	US-201616064566-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Dec 23, 2015
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

Embodiments of the present disclosure disclose an image details processing method, comprises: obtaining each luminance data in the image; performing non-linear transformation on the each luminance data to obtain corresponding transformed data; performing the low frequency processing on the transformed data to obtain low frequency data; based on the low-frequency data and the transformed data, determining the corrected luminance data. The embodiments of the present disclosure also disclose an image details processing apparatus, a terminal, and a storage medium.

First claim

What is claimed is:

1. An image details processing method, comprises:
obtaining each luminance data in an image;
performing non-linear transformation on the each luminance data to obtain corresponding transformed data Log n y, wherein y is luminance data, and n is a non-zero real number;
performing a low frequency processing on the transformed data to obtain low frequency data; and
based on the low-frequency data and the transformed data, determining a corrected luminance data Y by:
determining a corrected transformed data Log n y′ according to the obtained low-frequency data and the transformed data Log n y,
selecting a largest corrected transformed data Log n y′ max from the corrected transformed data Log n y′, and
determining the corrected luminance data Y by

Y
=

e

Log
n

⁢

y
′

Log
n

⁢

y
max
′

×
255

,

wherein Log n y′ is the corrected transformed data and Log n y′ max is the largest corrected transformed data.

2. The method according to claim 1 , wherein: performing non-linear transformation on the each luminance data to obtain corresponding transformed data, comprises:
transforming the luminance data from a real-number domain to a logarithmic domain to obtain the corresponding transformed data.

3. The method according to claim 1 , wherein: performing the low frequency processing on the transformed data to obtain low frequency data, comprises:
performing low-frequency filtering on the transformed data to obtain the low-frequency data; or
performing bi-linear interpolation on the transformed data to obtain the low-frequency data.

4. The method according to claim 1 , wherein: obtaining each luminance data in the image, comprises:
receiving user's photographing instruction;
getting image data of a current frame; and
separating a luminance component from the image data as the luminance data.

5. An image details processing apparatus, comprises:
an obtaining unit, configured to obtain each luminance data in an image;
a processing unit, configured to perform non-linear transformation on the each luminance data to obtain corresponding transformed data Log n y, and perform a low frequency processing on the transformed data to obtain low frequency data, wherein y is luminance data, n is a non-zero real number; and
a determining unit, configured to determine a corrected luminance data Y based on the low-frequency data and the transformed data by:
determining a corrected transformed data Log n y′ according to the obtained low-frequency data and the transformed data Log n y,
selecting a largest corrected transformed data Log n y′ max from the corrected transformed data Log n y′, and
determining the corrected luminance data Y by

Y
=

e

Log
n

⁢

y
′

Log
n

⁢

y
max
′

×
255

,

wherein Log n y′ is the corrected transformed data and Log n y′ max is the largest corrected transformed data.

6. The apparatus according to claim 5 , wherein the processing unit is configured to transform the luminance data from a real-number domain to a logarithmic domain to obtain the corresponding transformed data.

7. The apparatus according to claim 5 , wherein the processing unit is configured to:
perform low-frequency filtering on the transformed data to obtain the low-frequency data; or
perform bi-linear interpolation on the transformed data to obtain the low-frequency data.

8. The apparatus according to claim 5 , wherein the obtaining unit is configured to:
receive user's photographing instruction;
get image data of a current frame; and
separate a luminance component from the image data as the luminance data.

9. A terminal, comprises:
a storage medium, configured to store computer-executable instructions; and
a processor, configured to:
obtain each luminance data in an image,
perform non-linear transformation on the each luminance data to obtain corresponding transformed data Log n y, wherein y is the luminance data, n is a non-zero real number,
perform a low frequency processing on the transformed data to obtain low frequency data, and
determine a corrected luminance data Y based on the low-frequency data and the transformed data by:
determining a corrected transformed data Log n y′ according to the obtained low-frequency data and the transformed data Log n y,
selecting a largest corrected transformed data Log n y′ max from the corrected transformed data Log n y′, and
determining the corrected luminance data Y by

Y
=

e

Log
n

⁢

y
′

Log
n

⁢

y
max
′

×
255

,

 wherein Log n y′ is the corrected transformed data and Log n y′ max is the largest corrected transformed data.

10. The terminal according to claim 9 , wherein: performing non-linear transformation on the each luminance data to obtain corresponding transformed data, comprises:
transforming the luminance data from a real-number domain to a logarithmic domain to obtain the corresponding transformed data.

Assignees

• Nubia Technology Co Ltd

Inventors

• Zhu Dezhi

Classifications

• H04N5/21 Primary

  Circuitry for suppressing or minimising disturbance, e.g. moiré or halo · CPC title

• H04N9/646 Primary

  for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters · CPC title

• H04N9/77

  Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase (circuits for matrixing H04N9/67) · CPC title

• H04N5/205

  for correcting amplitude versus frequency characteristic · CPC title

• H04N1/4072

  dependent on the contents of the original · CPC title