blazediff-interpret 6.4.1

Structured region analysis for image diffs: classify what changed, not just where
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

use super::types::{BoundingBox, SpatialPosition};

/// Classify the spatial position of a bounding box within a 3x3 grid.
/// Uses the center point of the bbox to determine which cell it falls into.
pub fn classify_position(
    bbox: &BoundingBox,
    image_width: u32,
    image_height: u32,
) -> SpatialPosition {
    let center_x = bbox.x as f64 + bbox.width as f64 / 2.0;
    let center_y = bbox.y as f64 + bbox.height as f64 / 2.0;

    let third_w = image_width as f64 / 3.0;
    let third_h = image_height as f64 / 3.0;

    let col = if center_x < third_w {
        0
    } else if center_x < third_w * 2.0 {
        1
    } else {
        2
    };

    let row = if center_y < third_h {
        0
    } else if center_y < third_h * 2.0 {
        1
    } else {
        2
    };

    match (row, col) {
        (0, 0) => SpatialPosition::TopLeft,
        (0, 1) => SpatialPosition::Top,
        (0, 2) => SpatialPosition::TopRight,
        (1, 0) => SpatialPosition::Left,
        (1, 1) => SpatialPosition::Center,
        (1, 2) => SpatialPosition::Right,
        (2, 0) => SpatialPosition::BottomLeft,
        (2, 1) => SpatialPosition::Bottom,
        (2, 2) => SpatialPosition::BottomRight,
        _ => unreachable!(),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_classify_center() {
        let bbox = BoundingBox {
            x: 40,
            y: 40,
            width: 20,
            height: 20,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::Center);
    }

    #[test]
    fn test_classify_top_left() {
        let bbox = BoundingBox {
            x: 0,
            y: 0,
            width: 10,
            height: 10,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::TopLeft);
    }

    #[test]
    fn test_classify_bottom_right() {
        let bbox = BoundingBox {
            x: 80,
            y: 80,
            width: 20,
            height: 20,
        };
        assert_eq!(
            classify_position(&bbox, 100, 100),
            SpatialPosition::BottomRight
        );
    }

    #[test]
    fn test_classify_top() {
        let bbox = BoundingBox {
            x: 40,
            y: 0,
            width: 20,
            height: 10,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::Top);
    }

    #[test]
    fn test_classify_left() {
        let bbox = BoundingBox {
            x: 0,
            y: 40,
            width: 10,
            height: 20,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::Left);
    }

    #[test]
    fn test_classify_right() {
        let bbox = BoundingBox {
            x: 80,
            y: 40,
            width: 20,
            height: 20,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::Right);
    }

    #[test]
    fn test_classify_bottom_left() {
        let bbox = BoundingBox {
            x: 0,
            y: 80,
            width: 10,
            height: 20,
        };
        assert_eq!(
            classify_position(&bbox, 100, 100),
            SpatialPosition::BottomLeft
        );
    }

    #[test]
    fn test_classify_bottom() {
        let bbox = BoundingBox {
            x: 40,
            y: 80,
            width: 20,
            height: 20,
        };
        assert_eq!(classify_position(&bbox, 100, 100), SpatialPosition::Bottom);
    }

    #[test]
    fn test_classify_top_right() {
        let bbox = BoundingBox {
            x: 80,
            y: 0,
            width: 20,
            height: 10,
        };
        assert_eq!(
            classify_position(&bbox, 100, 100),
            SpatialPosition::TopRight
        );
    }
}