Struct ChannelHistogram 

pub struct ChannelHistogram {
    pub bins: [u32; 256],
    pub channel: u8,
    pub min_value: u8,
    pub max_value: u8,
    pub mean: f64,
    pub std_dev: f64,
}

Per-channel histogram data with summary statistics.

Fields

bins: [u32; 256]

Raw bin counts; bins[v] is the number of pixels with value v.

channel: u8

Channel index (0-based).

min_value: u8

Minimum pixel value present in this channel.

max_value: u8

Maximum pixel value present in this channel.

mean: f64

Mean pixel value.

std_dev: f64

Standard deviation of pixel values.

Implementations

impl ChannelHistogram

pub fn compute( data: &[u8], channel: u8, stride: usize, num_channels: usize, ) -> Self

Compute a histogram for one channel of a packed multi-channel image.

Arguments

• data - Raw pixel bytes for the whole image.
• channel - Zero-based channel index (e.g. 0=R, 1=G, 2=B).
• stride - Offset between the start of consecutive rows in bytes (use width * num_channels for packed images).
• num_channels - Total number of interleaved channels per pixel.

pub fn percentile(&self, p: f64) -> u8

Return the pixel value at the given percentile.

Arguments

• p - Percentile in [0.0, 1.0] (e.g. 0.5 for the median).

pub fn entropy(&self) -> f64

Compute the Shannon entropy of this channel’s histogram (in bits).

Returns 0.0 for a uniform (all-same-value) distribution.

Trait Implementations

impl Clone for ChannelHistogram

fn clone(&self) -> ChannelHistogram

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChannelHistogram

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.