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What is psnr in steganography?
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.
How to calculate Compression ratio for an image?
compression ratio=uncompressed image size/compressed size
How is magnification calculate?
It can be measured as the ratio between two points in the image compared to the same two points in the pre-image.
How to calculate image frequency?
f (image) = 2 * f (local oscillator) + fc ................. if f ( l.o ) > fc f (image) = 2* f (local oscillator) - fc
How do you calculate the eccentricity and how to decide the fixation point in an image?
Calculating the eccentricity requires information about the nature of the conic section.
How do you find flat region in digital image processing?
You could calculate two perpendicular gradients to each image pixel point. If both gradient are small the pixel pertains to a flat region.
How to calculate x of a lens knowing only the focal length which is the distance from the lens to the image of sun formed by it correct me if I'm wrong?
1/(focal length) = 1/(distance of object) + 1/(distance of image) is the formula for calculating x of a lens knowing only the focal length which is the distance from the lens to the image of sun formed by it.
What is a pre image in goemetry?
a pre-image is an image before and image is an image after
An object is kept in front of a concave mirror of focal length 20cm the image is 3 times the size of the object calculate 2 possible diastances of the object from the mirror?
40cm
What is the minimum hard drive capacity for storing digital images?
Depends on how many you want to store. Each image is probably going to be around 4MB. 1000MB are in a GB so you can calculate that out.
How to calculate how many lumens are needed to project an image 60 ft?
Da-Lite, the projector screen company has a great calculator here and even includes a brand and model reference.
What is the image on the microscope?
What image? I don't see an image.
