Image processing method, image processing apparatus, and wearable device

An image processing apparatus, comprising:

• a processor;
• and
• a memory, configured to store at least one instruction executable by the processor;
• wherein the processor is configured to:
• acquire an initial image comprising an image of pupil;
• acquire an accumulative histogram set of grayscale values of pixels in the initial image;
• determine a threshold for binarizing the initial image according to a grayscale value corresponding to a target region in respective accumulative histograms in the accumulative histogram set, wherein the target region corresponds to the image of pupil in the initial image;
• and
• binarize the initial image according to the threshold,
• wherein the processor is further configured to:
• compare a reference absolute value with a first difference threshold by taking a first non-zero grayscale value in the respective accumulative histograms as an ith grayscale value, wherein the reference absolute value is an absolute value of a difference between an accumulative value corresponding to the ith grayscale value and an accumulative value of an (i+x)th grayscale value, x being a positive integer;
• repeatedly compare the reference absolute value with the first difference threshold by taking the (i+x)th grayscale value as the ith grayscale value until a quantity of reference absolute values that are consecutive and are less than the first difference threshold reaches a first counting threshold;
• determine the current ith grayscale value as a start grayscale value in the respective accumulative histograms, wherein the grayscale value corresponding to the target region comprises the start grayscale value;
• and
• determine the threshold according to the start grayscale value in the accumulative histogram set wherein the processor is further configured to:
• compare a reference absolute value with a first difference threshold by taking a first non-zero grayscale value in the respective accumulative histograms as an ith grayscale value, wherein the reference absolute value is an absolute value of a difference between an accumulative value corresponding to the ith grayscale value and an accumulative value of an (i+x)th grayscale value, x being a positive integer;
• repeatedly compare the reference absolute value with the first difference threshold by taking the (i+x)th grayscale value as the ith grayscale value until a quantity of reference absolute values that are consecutive and are less than the first difference threshold reaches a first counting threshold;
• determine the current ith grayscale value as a start grayscale value in the respective accumulative histograms, wherein the grayscale value corresponding to the target region comprises the start grayscale value;
• and
• determine the threshold according to the start grayscale value in the accumulative histogram set.

A non-transitory computer-readable storage medium storing at least one instruction, wherein the computer-readable storage medium, when being run on a processing component, causes the processing component to:

• acquire an initial image comprising an image of pupil;
• acquire an accumulative histogram set of grayscale values of pixels in the initial image;
• determine a threshold for binarizing the initial image according to a grayscale value corresponding to a target region in respective accumulative histograms in the accumulative histogram set, wherein the target region corresponds to the image of pupil in the initial image;
• and
• binarize the initial image according to the threshold,
• wherein the computer-readable storage medium, when being run on a processing component, further causes the processing component to:
• compare a reference absolute value with a first difference threshold by taking a first non-zero grayscale value in the respective accumulative histograms as an ith grayscale value, wherein the reference absolute value is an absolute value of a difference between an accumulative value corresponding to the ith grayscale value and an accumulative value of an (i+x)th grayscale value, x being a positive integer;
• repeatedly compare the reference absolute value with the first difference threshold by taking the (i+x)th grayscale value as the ith grayscale value until a quantity of reference absolute values that are consecutive and are less than the first difference threshold reaches a first counting threshold;
• determine the current ith grayscale value as a start grayscale value in the respective accumulative histograms, wherein the grayscale value corresponding to the target region comprises the start grayscale value;
• and
• determine the threshold according to the start grayscale value in the accumulative histogram set wherein the processor is further configured to:
• compare a reference absolute value with a first difference threshold by taking a first non-zero grayscale value in the respective accumulative histograms as an ith grayscale value, wherein the reference absolute value is an absolute value of a difference between an accumulative value corresponding to the ith grayscale value and an accumulative value of an (i+x)th grayscale value, x being a positive integer;
• repeatedly compare the reference absolute value with the first difference threshold by taking the (i+x)th grayscale value as the ith grayscale value until a quantity of reference absolute values that are consecutive and are less than the first difference threshold reaches a first counting threshold;
• determine the current ith grayscale value as a start grayscale value in the respective accumulative histograms, wherein the grayscale value corresponding to the target region comprises the start grayscale value;
• and
• determine the threshold according to the start grayscale value in the accumulative histogram set.