Method and system for random accessible image compression with adaptive quantization

An encoder for image compression with random access capability, the encoder being configured to:

• segment an image into a plurality of blocks, each block including predefined samples;
• transform the predefined samples into a frequency domain;
• apply a first quantization factor to the transformed predefined samples;
• determine whether the first quantization factor results in a bit count that is within a tolerance range of an allowable bit count;
• and
• adaptively compute a second quantization factor in response to determining that the bit count is not within the tolerance range of the allowable bit count.

A computer program product comprising computer executable program code recorded on a computer readable non-transitory storage medium, said computer executable program code when executed causing a computer to:

• segment an image into a plurality of blocks, each block including predefined samples;
• transform the predefined samples into a frequency domain;
• apply a first quantization factor to the transformed predefined samples;
• determine whether the first quantization factor results in a bit count that is within a tolerance range of an allowable bit count;
• and
• adaptively compute a second quantization factor in response to determining that the bit count is not within the tolerance range of the allowable bit count.

A method of image compression with random access capability, the method comprising:

• receiving an image that has been segmented into a plurality of blocks in which each block includes samples;
• transforming the samples into a frequency domain;
• applying a first quantization factor to the transformed samples;
• determining whether application of the first quantization factor results in a bit count that is within a tolerance range of an allowable bit count;
• adaptively computing a second quantization factor in response to determining that the bit count is not within the tolerance range of the allowable bit count;
• and
• compressing the image by applying the first quantization factor or the second quantization factor.