Determining scaling factors for devices
An image scaling service includes determining an image as a candidate for a scaling process, scanning the image for an initial text value, and scaling the image to a next lower resolution. The image scaling service also includes iteratively performing the scaling process until a threshold value of a readability metric is reached, the scaling process includes scanning the scaled image for a scaled text value, comparing a difference between the initial text value and the scaled text value, the difference indicative of the readability metric, and scaling the scaled image to a next lower resolution. In response to reaching the threshold value of the readability metric, the image scaling service further includes selecting from scaled images an image having a lowest resolution resulting from the scaling process before the threshold value of the readability metric was reached.
1. A system, comprising:
a computer processor; and
logic executable by the computer processor, the logic configured to implement a method, the method including:
determining an image as a candidate for a scaling process;
scanning the image and identifying text in the image from the scanning;
scaling the image to a next lower resolution, the scaling comprising reducing a set of pixel dimensions to a nearest lower rendering level;
iteratively performing the scaling process until a threshold value of a readability metric is reached, the scaling process including:
scanning the scaled image for scaled text;
comparing a difference between the text and the scaled text to the difference indicative of the readability metric; and
scaling the scaled image to a next lower resolution; and
responsive to reaching the threshold value of the readability metric, selecting from scaled images an image having a lowest resolution resulting from the scaling process before the threshold value of the readability metric was reached;
wherein the readability metric is calculated as a function of a Levenshtein Distance between the text and the scaled text, and a length of the original text.
2. The system of claim 1 , wherein the image is determined as a candidate based on capabilities identified for an end user device requesting a web page in which the image is presented.
3. The system of claim 1 , wherein the identifying text is implemented using optical character recognition.
4. The system of claim 1 , wherein the readability metric is a configurable, user-defined value.