Fixed DCT histogram generation (and FFT thereof).
Fixed DCT histogram generation (and FFT thereof).

Eliminated unwarranted dequantization of extracted DCT coefficients.
Fixed incorrect zero-meaning of histogram bin values prior to FFT.
Replaced numpy.fft.fft with numpy.fft.rfft since input values were not
complex.
Refactored DCTView and FFT_DCTView classes to eliminate duplicate code.
Refactored (most) module-level JPEG parsing functions into JPEG_Reader
class.
rwgdrummer/maskgen,rwgdrummer/maskgen