PSNR is one of metrics to determine the degradation in the embedded image with respect to the host image..Values over 36 dB in PSNR are acceptable in terms of degradation, which means no significant degradation is observed by human eye[source] Xuanwen Luo, Qiang Cheng, Joseph Tan, "A Lossless Data Embedding Scheme For Medical in Application of e- Diagnosis," Proceedings of the 25th Annual International Conference of the IEEE EMBS Cancun, Mexico. September 17-21, 2003.
To calculate the total number of pixels in an image, multiply the width of the image in pixels by the height of the image in pixels. This will give you the total pixel count of the image.
The pixel size formula used to calculate the dimensions of an image is: Image width (in pixels) x Image height (in pixels) Total number of pixels in the image.
To calculate the pixel size of an image, you need to divide the width or height of the image in pixels by the physical size of the image in inches. This will give you the pixel size per inch.
compression ratio=uncompressed image size/compressed size
To calculate the position of an image formed by a lens or mirror, you can use the thin lens equation (1/f = 1/do + 1/di) where f is the focal length, do is the object distance, and di is the image distance. By solving this equation, you can determine the image position relative to the lens or mirror.
It can be measured as the ratio between two points in the image compared to the same two points in the pre-image.
f (image) = 2 * f (local oscillator) + fc ................. if f ( l.o ) > fc f (image) = 2* f (local oscillator) - fc
To calculate the position of the image formed by a lens or mirror, you need to use the thin lens or mirror formula: 1/f = 1/do + 1/di, where f is the focal length of the lens or mirror, do is the object distance, and di is the image distance. Once you have the values for the focal length and object distance, you can solve for the image distance to determine the position of the image formed.
The size of the image will depend on the distance between the object and the lens (or mirror) producing the image. If you provide information about this distance, we can help calculate the size of the image.
To calculate the image position when given magnification by a concave mirror, you can use the mirror equation: 1/f = 1/d_o + 1/d_i, where f is the focal length of the mirror, d_o is the object distance, and d_i is the image distance. Magnification, M, is also given by -d_i/d_o. By substituting the values of magnification and focal length into the mirror equation, you can solve for the image distance and then determine the image position.
One way to measure the size of an object from an image is to use a known reference object of a standard size in the same image. By comparing the size of the reference object to the size of the object you want to measure, you can calculate the size of the object in the image.