An image processing method and an image processing apparatus in which a DCT section transforms image data to a frequency conversion coefficient using a discrete cosine transform coefficient, a quantizing section quantizes the transformed frequency conversion coefficient using a quantization coefficient indicating weighing in quantization, a Huffman encoding section encodes the quantized data, and a CPU detects a code rate for encoded data by a prespecified time interval during execution of processing for encoding the data quantized by the encoding means and changes the quantization coefficient during processing for encoding according to the detected code rate.
The present invention relates to a process for controlling the compression ratio of digital images. This process consists of compressing a digitized image by means of a conventional process such as that known by the abbreviation JPEG. The compression ratio of the image is modified by modifying a parameter of the JPEG process, called the scale factor. According to the invention this scale factor is modified until the compression ratio obtained lies in a range of tolerance of the desired compression ratio. The process uses and approximation to the actual curve of the compression ratio as a function of the scale factor, in order to minimize the number of iterations needed to attain the desired compression ratio.
The present invention comprises a test set-up (20) and method of testing a correlated double sampling circuit (CDS) (24) by using a sinusoidal test signal (22) for measuring linearity. The present invention generates a sinusoidal signal with two accurate and known levels at two different time points, as an input to the CDS. The cosinusoidal output of the CDS is then processed using an ADC (60) and processor (62) to check the functionality and linearity of the CDS circuit under test.
A method comprising selecting a quantization threshold parameters set based upon available storage in a storage mechanism configured to store quantized image data, and quantizing image data using the selected quantization threshold parameter set, the selecting and quantizing guaranteeing that at minimum number (M) of quantized image data can be stored in the storage mechanism.
In an image input apparatus for compressing, in real time, image data obtained by reading an image and storing it in a memory, a memory area is ensured, an original is read and its image data is outputted, the image data is compressed in real time, the compressed image data is stored in the memory area, and it is determined whether the compressed image data is completely stored in the memory area. If it is determined that the image data is not completely stored, the compression ratio is increased, and the original read, compression of read image data, and storage of the compressed image data are repeated using the changed compression ratio.
In a voice mode, when a shutter button of a camera is fully depressed, first and second switches are turned ON, recording of voice starts. The shutter button is released. When the shutter button is half depressed after the shutter button is released the recording of the voice is stopped. Since the recording of voice is performed between when the shutter button is released and when it is depressed half, no mechanical sound is recorded.
