Abstract: A method of estimating shift of white balance point. According to characteristics of a photograph sensing apparatus, a white-point plane of a YIQ color coordinate is determined. The white-point plane has a normal direction pointing one of the axis of the YIQ color coordinate. The white-point plane is thus perpendicular to such axis with a one-dimensional one-spot value. Consequently, a YIQ image data described by the YIQ color coordinate is obtained. The same rotation operation is performed to rotate the YIQ image data to obtain a one-dimensional image value. The one-dimensional image value is compared to the one-dimensional white-point value to obtain a differential value, so as to estimate the white-point shift. In the above method, the axis of the YIQ color coordinate includes the Y-axis after rotation.

Abstract: A method of estimating shift of white balance point. According to characteristics of a photograph sensing apparatus, a white-point plane of a YIQ color coordinate is determined. The white-point plane has a normal direction pointing one of the axis of the YIQ color coordinate. The white-point plane is thus perpendicular to such axis with a one-dimensional one-spot value. Consequently, a YIQ image data described by the YIQ color coordinate is obtained. The same rotation operation is performed to rotate the YIQ image data to obtain a one-dimensional image value. The one-dimensional image value is compared to the one-dimensional white-point value to obtain a differential value, so as to estimate the white-point shift. In the above method, the axis of the YIQ color coordinate includes the Y-axis after rotation.

Abstract: An image sensing device includes a pixel sensing data processing unit, for receiving a pixel line sensing data to output first and second outputs. A controller receives the first output from the pixel sensing data processing unit, checks whether the pixel line sensing data include at least one defective pixel. If it has defective pixel, a correction rule is applied to compare the status data with a previously defective pixel. The correction rule includes comparing a state data of the previous defect pixels. If the defective pixel belongs to a regular pattern, the defective pixel is not corrected. A correction unit receives the second output and receives the correction status from the controller, and to correct the pixel and exports a display data. A recording unit records the status data of the defective pixel detected by the controller for comparing the status data of the next pixel line sensing data.

Abstract: A preview system for a digital camera is provided. The preview system comprises an image capture apparatus, an image signal processor and a display device. The image capture apparatus detects from an actual photographic object to generate a first image signal. The image signal processor corrects the first image signal to generate a second image signal. The corrected second image signal is transmitted to the display device to provide a preview image. This invention discloses a simple image processor circuit. In addition, a less expensive and power-consuming multiple gray scale super-twisted nematic liquid crystal display (STN-LCD) instead of a color thin-film transistor liquid crystal display (TFT-LCD). Thus, the digital camera can operate for an extended period of time and an optical viewfinder can be omitted to reduce the size and the cost of the digital camera.

Abstract: A method of estimating shift of white balance point. According to characteristics of a photograph sensing apparatus, a white-point plane of a YIQ color coordinate,is determined. The white-point plane has a normal direction pointing one of the axis of the YIQ color coordinate. The white-point plane is thus perpendicular to such axis with a one-dimensional one-spot value. Consequently, a YIQ image data described by the YIQ color coordinate is obtained. The same rotation operation is performed to rotate the YIQ image data to obtain a one-dimensional image value. The one-dimensional image value is compared to the one-dimensional white-point value to obtain a differential value, so as to estimate the white-point shift. In the above method, the axis of the YIQ color coordinate includes the Y-axis after rotation.

Abstract: A method of fast converging an appropriate exposure value. By establishing a EV lookup table of exposure valuescamera characteristics that can be easily modified, the image extracted by an optical sensor of a digital camera is fast converged into an appropriate exposure value quickly in a close-loop computation. Therefore, the multi-variable (exposure time, gain value and f-number number) exposure control can be easily achieved to fast converge the appropriate automatic exposure value.