Image processing device, image processing method, and program for generating water marks
Even when an image in which a watermark is embedded is processed, certainty of detecting the watermark is increased. Image data acquisition unit of an image processing device acquires image data. A watermark generation unit generates watermarks having a plurality of sizes. An image processing unit embeds the respective watermarks having the plurality of sizes generated by the watermark generation unit in an image indicated by the image data acquired by the image data acquisition unit.
1. An image processing device, comprising at least one processor configured to:
acquire image data;
acquire an extension from a file name of the image data;
determine a plurality of sizes of watermarks to be generated based on the extension;
generate the watermarks having the determined plurality of sizes; and
embed the respective watermarks in an image indicated by the image data.
2. The image processing device according to claim 1 ,
wherein the image includes a color image having a plurality of color channels, and
wherein the at least one processor is configured to embed the respective watermarks in each of the plurality of color channels by changing respective numerical values in the plurality of color channels contained in a pixel value of the color image.
3. The image processing device according to claim 2 , wherein the at least one processor is configured to embed the watermarks so that a part or all of the watermarks embedded in each of the plurality of color channels overlap one another.
4. The image processing device according to claim 1 ,
wherein the at least one processor is configured to receive a request for the image data by a user,
wherein the watermark contains information for identifying the user requesting the image data, and
wherein the at least one processor is configured to provide the image data in which the watermark is embedded to the user who has made the request.
5. The image processing device according to claim 1 ,
wherein the watermark includes a 2D code having a plurality of error collection levels, and
wherein the at least one processor is configured to generate, for each of the plurality of sizes, the 2D code having an error correction level equal to or higher than a reference value.
6. The image processing device according to claim 1 , wherein the at least one processor is configured to determine positions at which the respective watermarks having the plurality of sizes are to be embedded so that a size of each of the watermarks is reduced as a position of each of the watermarks approaches a center of the image.
7. The image processing device according to claim 1 , wherein the at least one processor is configured to
embed a plurality of watermark groups each including the respective watermarks having the plurality of sizes in an image.
8. An image processing method, comprising:
acquiring image data;
acquiring an extension from a file name of the image data;
determining a plurality of sizes of watermarks to be generated based on the extension;
generating the watermarks having the determined plurality of sizes; and
embedding the respective watermarks in an image indicated by the image data.
9. A non-transitory computer-readable information storage medium for storing a program for causing a computer to:
acquire image data;
acquire an extension from a file name of the image data;
determine a plurality of sizes of watermarks to be generated based on the extension;
generate the watermarks having the determined plurality of sizes; and
embed the watermarks having the respective sizes in an image indicated by the image data.