How can I generate quantizatinon metrics with different size and quality, does matlab have a function for it?
Explain your context to PLS Quantification Matrix ... for what? If you are working with JPEG image compression (Image Block + DCT + quantization + Huffman coding), Compressor has the freedom to use his own quatization matrix - or rather the matrix one Family, each "Em> Quality factor ".
Conceptually, usually want to assign some frequencies to low frequency components and high frequencies - but it can be said in general, which is all about.
Also, be aware that JPEG separates lumination and chroma (and chroma is usually subsumed), so each matrix can be used for each one.
I believe standard standard general matrix, which includes scaling factor for various properties, but this is not absolutely necessary. In addition, you can find several metrics for many camera and image applications.
Update : From:
Tuning quantization tables is a black art for best results, and an active research area is most Existing encoders use simple linear scaling in the example table given in the JPEG standard using a single user-specified "quality" setting to determine the scaling multiplier. This midrange works well for properties (not very far from the sample tables), but there is quite a non-terminal on very high or low quality settings.
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