Database design to store image color pattern in MySQL for searching Image by color

Question

I am building a image galley using PHP and MySQL where I want to implement Image search by it\'s color. By following Imagick::getImageHistogram i got the mo

Answer 1

You should normalize this.

3 Tables:

Image {image_id, name}
Colors {color_id, red, green, blue, alpha}
ImageHasColor {image_id, color_id, number_of_times_appeared}

Inserting data should be simple, use ...insert_id functions to get the id from the row you just inserted.

Select with joins like:

SELECT * FROM
Image i
JOIN ImageHasColors h
ON i.image_id = h.image_id
JOIN Colors c
ON c.color_id = h.color_id
ORDER BY i.image_id

Check this link on how to convert HEX color to RGB values: http://bavotasan.com/2011/convert-hex-color-to-rgb-using-php/

Search top 10 really red pictures:

SELECT * FROM
Image i
JOIN ImageHasColors h
ON i.image_id = h.image_id
JOIN Colors c
ON c.color_id = h.color_id
WHERE c.red > 200
AND   c.green < 50
AND   c. green < 50
ORDER BY h.number_of_times_appeared
LIMIT 10

Search rather black pictures:

SELECT * FROM
Image i
JOIN ImageHasColors h
ON i.image_id = h.image_id
JOIN Colors c
ON c.color_id = h.color_id
WHERE c.red < 30
AND   c.green < 30
AND   c. green < 30
ORDER BY h.number_of_times_appeared
LIMIT 10