Image processing method and apparatus, and storage medium

An image processing apparatus included in a mobile terminal, comprising:

• a processor;
• and
• a memory, configured to store instructions executable by the processor,
• wherein the processor is configured to:
• extract a red, green and blue channel image and a white channel image from a target image;
• determine a first gray-scale component image of the red, green and blue channel image, and determine a second gray-scale component image of the white channel image;
• determine first decomposed sub-band information of the first gray-scale component image, and determine second decomposed sub-band information of the second gray-scale component image, wherein the first decomposed sub-band information comprises at least one decomposition level, each decomposition level comprises at least one frequency band, and each frequency band corresponds to a frequency band coefficient matrix, wherein the second decomposed sub-band information comprises at least one decomposition level, each decomposition level comprises at least one frequency band, and each frequency band corresponds to a frequency band coefficient matrix;
• determine third decomposed sub-band information according to the first decomposed sub-band information and the second decomposed sub-band information;
• perform image reconstruction according to the third decomposed sub-band information to obtain a third gray-scale component image, and constructing a color image corresponding to the target image according to the third gray-scale component image;
• wherein the processor is configured to:
• take the same frequency band of the first decomposed sub-band information and the second decomposed sub-band information under the same decomposition level as the corresponding frequency band of the third decomposed sub-band information under the decomposition level;
• and
• for each frequency band in the third decomposed sub-band information under respective decomposition levels, calculate the frequency band coefficient matrix of the corresponding frequency band in the third decomposed sub-band information according to the frequency band coefficient matrix of the corresponding frequency band in the first decomposed sub-band information and the frequency band coefficient of the corresponding frequency band in the second decomposed sub-band information matrix.

A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when being executed by a processor of a mobile terminal, enable the mobile terminal to execute an image processing method, the method comprising:

• extracting a red, green and blue channel image and a white channel image from a target image;
• determining a first gray-scale component image of the red, green and blue channel image, and determining a second gray-scale component image of the white channel image;
• determining first decomposed sub-band information of the first gray-scale component image, and determining second decomposed sub-band information of the second gray-scale component image, wherein the first decomposed sub-band information comprises at least one decomposition level, each decomposition level comprises at least one frequency band, and each frequency band corresponds to a frequency band coefficient matrix, wherein the second decomposed sub-band information comprises at least one decomposition level, each decomposition level comprises at least one frequency band, and each frequency band corresponds to a frequency band coefficient matrix;
• determining third decomposed sub-band information according to the first decomposed sub-band information and the second decomposed sub-band information;
• and
• performing image reconstruction according to the third decomposed sub-band information to obtain a third gray-scale component image, and constructing a color image corresponding to the target image according to the third gray-scale component image;
• wherein determining the third decomposed sub-band information according to the first decomposed sub-band information and the second decomposed sub-band information comprises:
• taking the same frequency band of the first decomposed sub-band information and the second decomposed sub-band information under the same decomposition level as the corresponding frequency band of the third decomposed sub-band information under the decomposition level;
• and
• for each frequency band in the third decomposed sub-band information under respective decomposition levels, calculating the frequency band coefficient matrix of the corresponding frequency band in the third decomposed sub-band information according to the frequency band coefficient matrix of the corresponding frequency band in the first decomposed sub-band information and the frequency band coefficient of the corresponding frequency band in the second decomposed sub-band information matrix.