Description: 第一：边界加强，通过估计噪声和实际信号的比值，来确定各个尺度的细节系数，以达到噪声抑制和边界加强。第二，通过对小波分解的近似部分进行直方图均衡，达到加大整幅图片的对比度，而不太影响细节的目的。-First: to strengthen the border, through the estimates and the actual signal noise ratio, to determine the details of each scale factor, so as to achieve noise suppression and boundary strengthening. Secondly, the wavelet decomposition of the approximate portion of histogram equalization to increase the contrast of the whole images, and do not affect the details of the purpose. Platform: |
Size: 686080 |
Author:蔡志成 |
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Description: 该方法采用反对称双正交小波分解系数计算视频帧的方向梯度向量，再统计由梯度向量角和模值构成的联合空间二维直方图，然后计算连续帧直方图之间的距离，得到两帧之间的不连续值，最后采用自适应阈值分割，检测出镜头边界。-This method is the use of anti-symmetric biorthogonal wavelet decomposition coefficients video frame the direction of gradient vector, and then statistics from the gradient vector angle and modulus values constitute the joint space of two-dimensional histogram, and then calculating the histogram for the distance between frames, by the two frames between the consecutive values, the final adaptive threshold segmentation, shot boundary detected. Platform: |
Size: 144384 |
Author:韩瑞冬 |
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Description: In Year 2012, C.P. Sumathi performed a work," A SURVEY ON VARIOUS APPROACHES OF TEXT EXTRACTION IN IMAGES. Author based on morphological operators, wavelet transform, artificial neural network,skeletonization operation,edge detection algorithm, histogram technique etc. All these techniques have their benefits and restrictions. This article discusses various schemes proposed earlier for extracting the text from an image. This paper also provides the performance comparison of several existing methods proposed by researchers in extracting the text from an image.-In Year 2012, C.P. Sumathi performed a work," A SURVEY ON VARIOUS APPROACHES OF TEXT EXTRACTION IN IMAGES. Author based on morphological operators, wavelet transform, artificial neural network,skeletonization operation,edge detection algorithm, histogram technique etc. All these techniques have their benefits and restrictions. This article discusses various schemes proposed earlier for extracting the text from an image. This paper also provides the performance comparison of several existing methods proposed by researchers in extracting the text from an image. Platform: |
Size: 435200 |
Author:payal |
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Description: Color Image Enhancement Techniques:
A Critical Review
Abstract
Image enhancement is one of the key issues in high quality pictures such as digital camera and HDTV. Since
Image clarity is very easily affected by lighting, weather, or equipment that has been used to capture the image.
These conditions lead to image may suffer from loss of information. As a result, many techniques have
developed known as image Enhancement techniques to recover the information in an image. This paper presents
a literature review on some of the image Enhancement techniques for color image enhancement like, Contrast
Stretching, Histogram Equalization and its improvement versions, Homomorphic Filtering, Retinex, and
Wavelet Multiscale Transform. Comparison of all the techniques concludes the better approach for its future
research Platform: |
Size: 1063936 |
Author:hussain |
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Description: A novel pixel gray stretch in wavelet domain and rapid image threshold segmentation
algorithm is proposed in view of the case that there is no visible double peak histogram in
uneven illumination image. Firstly
，
it stretch the image gray and enhance the image contrast
by the Otsu threshold segmentation method and Retinex model in wavelet domain-A novel pixel gray stretch in wavelet domain and rapid image threshold segmentation
algorithm is proposed in view of the case that there is no visible double peak histogram in
uneven illumination image. Firstly
，
it stretch the image gray and enhance the image contrast
by the Otsu threshold segmentation method and Retinex model in wavelet domain Platform: |
Size: 2849792 |
Author:杨松 |
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Description: 文件包含三个主程序，和相关图像，三个主程序分别为computer1，computer2，computer3
computer1对图像进行了灰度化，保存等实现；
computer2对图像进行了傅里叶变换，离散余旋变化，二层小波变化及重构等，并对图像进行三层小波变换，分别将HL，LH，HH三个子带置零都重构；
computer3实现了图像直方图均衡化，并对图像进行了同态滤波。(The file contains three main programs, and related images, three main programs are computer1, computer2, computer3
Computer1 on the image of the gray scale, save and other implementations;
The wavelet transform of the image is carried out, and the three subbands of HL, LH and HH are reconstructed respectively by Fourier transform, discrete cosine transform, two - layer wavelet transform and reconstruction.
Computer3 to achieve the image histogram equalization, and the image was homomorphic filtering.) Platform: |
Size: 2909184 |
Author:东升2014
|
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Search - histogram by wavelet